- Published on
Emergency And Acute Medicine – Thoracic Aortic Dissection
Foundational Overview: Thoracic aortic dissection begins with an intimal tear, allowing blood to enter and propagate through the aortic media under systolic pressure. Systemic hypertension is the dominant precipitating factor. Dissection may extend distally to involve carotid, subclavian, or visceral branches, or proximally to affect the aortic root, coronary ostia, and pericardium. Proximal extension may result in coronary artery occlusion, acute aortic regurgitation, or cardiac tamponade.
Anatomic Classification:
Stanford system: Type A involves the ascending aorta; Type B originates distal to the ascending aorta.
DeBakey system: Type I begins at the aortic root or arch, Type II is confined to the ascending aorta, and Type III originates distal to the left subclavian artery.
Peak incidence occurs at 50–55 years for proximal dissections and 60–70 years for distal dissections. Pregnancy markedly increases risk; in women younger than 40 years, up to half of dissections occur during pregnancy.
Predisposing Causes:
Any condition that weakens aortic wall integrity may lead to dissection. Common factors include chronic hypertension, congenital heart disease (bicuspid aortic valve, coarctation), cystic medial degeneration, connective tissue disorders (Marfan syndrome, Ehlers–Danlos), pregnancy, vasculitides (e.g., lupus, syphilis, giant cell arteritis, Takayasu arteritis), prior cardiac surgery (CABG or valve repair), and tobacco use.
Clinical Presentation:
Pain is classically abrupt, severe, and sharp, though absent in up to 15% of patients. Ascending dissections often cause substernal pain, descending dissections interscapular pain, and abdominal involvement lumbar pain. Combined chest, back, and abdominal pain is common. Neurologic manifestations may include visual changes or focal deficits. Atypical symptoms—syncope, fever, nausea, vomiting, leg pain, or altered mental status—may delay diagnosis. Older adults are less likely to report sudden pain, pulse deficits, or aortic regurgitation and have higher mortality.
Examination Findings:
Hypertension is common, though 35–40% may be normotensive. Pulse or blood pressure differentials between limbs suggest branch vessel involvement. A murmur of acute aortic regurgitation (often musical or vibrating) is heard in up to one-third of patients. Shock may occur from tamponade or myocardial infarction due to coronary artery involvement. Presentations may mimic heart failure, limb ischemia, or stroke.
Immediate Assessment Priorities:
Electrocardiography helps evaluate ischemia or infarction; inferior MI may result from right coronary artery involvement. A normal ECG in the setting of sudden, severe chest or back pain should heighten suspicion for dissection rather than ischemia.
Diagnostic Evaluation:
Laboratory findings are nonspecific and may include leukocytosis, hematuria, elevated creatinine, increased amylase from bowel ischemia, or elevated cardiac enzymes. A D-dimer below 500 ng/mL reduces likelihood but is insufficient as a sole screening test.
Chest radiography may show mediastinal widening, abnormal aortic contour, or cardiomegaly from hemopericardium, though up to 18% of films are normal.
Echocardiography identifies complications; transesophageal echocardiography is useful in unstable patients.
CT angiography is the diagnostic modality of choice in most centers due to high sensitivity and rapid availability. MRI offers excellent accuracy but limited emergency access. Aortography and cardiac catheterization are now rarely first-line but may reveal an intimal flap during evaluation for ischemia.
Key Diagnostic Alternatives:
Acute coronary syndrome, unstable angina, pneumothorax, esophageal rupture, pulmonary embolism, pericarditis, pneumonia, and musculoskeletal pain.
Prehospital Care:
Provide oxygen, establish IV access, and initiate monitoring.
Early Stabilization:
Secure two large-bore IV lines, apply continuous cardiac monitoring and pulse oximetry, administer oxygen, and prepare blood for crossmatching.
Definitive Emergency Management:
Rapid blood pressure and heart rate control are essential to reduce aortic shear stress. Initiate IV β-blockade (esmolol or labetalol) before vasodilators. Nitroprusside may be added once adequate β-blockade is established.
Type A dissections require emergent cardiothoracic surgery. Stable Type B dissections are managed medically unless complications develop.
Pharmacologic Therapy:
Esmolol IV bolus followed by infusion or labetalol IV bolus and drip for rate and pressure control. Nitroprusside infusion may be titrated carefully in conjunction with β-blockade.
Disposition Planning:
All patients with acute thoracic aortic dissection require ICU admission and immediate cardiothoracic surgical consultation. There are no discharge candidates from the ED.
Follow-Up Strategy:
Long-term management requires close cardiology and cardiothoracic surgery follow-up.
Clinical Pearls And Pitfalls:
Ascending aortic dissection carries an untreated mortality approaching 75% within two weeks, with death rates of 1–3% per hour during the first 48 hours. Most patients experience sudden-onset, severe pain, but atypical presentations are common. Thrombolytics and anticoagulants may be fatal if dissection is misdiagnosed as myocardial infarction or pulmonary embolism. Maintain a high index of suspicion in patients with refractory chest pain or chest pain accompanied by neurologic, back, abdominal, or limb symptoms, particularly in the presence of hypertension, male sex, advanced age, pregnancy, cocaine use, connective tissue disease, bicuspid aortic valve, or prior cardiac surgery.
Foundational Overview: Thoracic aortic dissection begins with an intimal tear, allowing blood to enter and propagate through the aortic media under systolic pressure. Systemic hypertension is the dominant precipitating factor. Dissection may extend distally to involve carotid, subclavian, or visceral branches, or proximally to affect the aortic root, coronary ostia, and pericardium. Proximal extension may result in coronary artery occlusion, acute aortic regurgitation, or cardiac tamponade.
Anatomic Classification:
Stanford system: Type A involves the ascending aorta; Type B originates distal to the ascending aorta.
DeBakey system: Type I begins at the aortic root or arch, Type II is confined to the ascending aorta, and Type III originates distal to the left subclavian artery.
Peak incidence occurs at 50–55 years for proximal dissections and 60–70 years for distal dissections. Pregnancy markedly increases risk; in women younger than 40 years, up to half of dissections occur during pregnancy.
Predisposing Causes:
Any condition that weakens aortic wall integrity may lead to dissection. Common factors include chronic hypertension, congenital heart disease (bicuspid aortic valve, coarctation), cystic medial degeneration, connective tissue disorders (Marfan syndrome, Ehlers–Danlos), pregnancy, vasculitides (e.g., lupus, syphilis, giant cell arteritis, Takayasu arteritis), prior cardiac surgery (CABG or valve repair), and tobacco use.
Clinical Presentation:
Pain is classically abrupt, severe, and sharp, though absent in up to 15% of patients. Ascending dissections often cause substernal pain, descending dissections interscapular pain, and abdominal involvement lumbar pain. Combined chest, back, and abdominal pain is common. Neurologic manifestations may include visual changes or focal deficits. Atypical symptoms—syncope, fever, nausea, vomiting, leg pain, or altered mental status—may delay diagnosis. Older adults are less likely to report sudden pain, pulse deficits, or aortic regurgitation and have higher mortality.
Examination Findings:
Hypertension is common, though 35–40% may be normotensive. Pulse or blood pressure differentials between limbs suggest branch vessel involvement. A murmur of acute aortic regurgitation (often musical or vibrating) is heard in up to one-third of patients. Shock may occur from tamponade or myocardial infarction due to coronary artery involvement. Presentations may mimic heart failure, limb ischemia, or stroke.
Immediate Assessment Priorities:
Electrocardiography helps evaluate ischemia or infarction; inferior MI may result from right coronary artery involvement. A normal ECG in the setting of sudden, severe chest or back pain should heighten suspicion for dissection rather than ischemia.
Diagnostic Evaluation:
Laboratory findings are nonspecific and may include leukocytosis, hematuria, elevated creatinine, increased amylase from bowel ischemia, or elevated cardiac enzymes. A D-dimer below 500 ng/mL reduces likelihood but is insufficient as a sole screening test.
Chest radiography may show mediastinal widening, abnormal aortic contour, or cardiomegaly from hemopericardium, though up to 18% of films are normal.
Echocardiography identifies complications; transesophageal echocardiography is useful in unstable patients.
CT angiography is the diagnostic modality of choice in most centers due to high sensitivity and rapid availability. MRI offers excellent accuracy but limited emergency access. Aortography and cardiac catheterization are now rarely first-line but may reveal an intimal flap during evaluation for ischemia.
Key Diagnostic Alternatives:
Acute coronary syndrome, unstable angina, pneumothorax, esophageal rupture, pulmonary embolism, pericarditis, pneumonia, and musculoskeletal pain.
Prehospital Care:
Provide oxygen, establish IV access, and initiate monitoring.
Early Stabilization:
Secure two large-bore IV lines, apply continuous cardiac monitoring and pulse oximetry, administer oxygen, and prepare blood for crossmatching.
Definitive Emergency Management:
Rapid blood pressure and heart rate control are essential to reduce aortic shear stress. Initiate IV β-blockade (esmolol or labetalol) before vasodilators. Nitroprusside may be added once adequate β-blockade is established.
Type A dissections require emergent cardiothoracic surgery. Stable Type B dissections are managed medically unless complications develop.
Pharmacologic Therapy:
Esmolol IV bolus followed by infusion or labetalol IV bolus and drip for rate and pressure control. Nitroprusside infusion may be titrated carefully in conjunction with β-blockade.
Disposition Planning:
All patients with acute thoracic aortic dissection require ICU admission and immediate cardiothoracic surgical consultation. There are no discharge candidates from the ED.
Follow-Up Strategy:
Long-term management requires close cardiology and cardiothoracic surgery follow-up.
Clinical Pearls And Pitfalls:
Ascending aortic dissection carries an untreated mortality approaching 75% within two weeks, with death rates of 1–3% per hour during the first 48 hours. Most patients experience sudden-onset, severe pain, but atypical presentations are common. Thrombolytics and anticoagulants may be fatal if dissection is misdiagnosed as myocardial infarction or pulmonary embolism. Maintain a high index of suspicion in patients with refractory chest pain or chest pain accompanied by neurologic, back, abdominal, or limb symptoms, particularly in the presence of hypertension, male sex, advanced age, pregnancy, cocaine use, connective tissue disease, bicuspid aortic valve, or prior cardiac surgery.
- Published on
Emergency And Acute Medicine – Antidepressant Poisoning
Core Overview: Antidepressants are among the most commonly prescribed psychiatric medications in the United States. Overdose presentations often involve selective serotonin reuptake inhibitors (SSRIs), serotonin–norepinephrine reuptake inhibitors (SNRIs), or atypical antidepressants, frequently in combination with atypical antipsychotics or mood stabilizers. These agents are also prescribed for chronic pain, anxiety disorders, eating disorders, substance use disorders, and sleep disturbances. Tricyclic antidepressants are discussed separately.
Mechanisms And Causes:
SSRIs increase synaptic serotonin by inhibiting presynaptic reuptake (e.g., fluoxetine, paroxetine, sertraline, citalopram, escitalopram).
SNRIs inhibit reuptake of both serotonin and norepinephrine (e.g., venlafaxine, desvenlafaxine, duloxetine) and may be more toxic in overdose than initially assumed.
Atypical antidepressants have variable effects on serotonin, norepinephrine, and dopamine and include bupropion, trazodone, and mirtazapine.
Atypical antipsychotics act primarily on dopamine receptors with additional serotonergic, α-adrenergic, histaminic, and muscarinic effects. Many psychiatric medications can block potassium and sodium channels, resulting in QT or QRS prolongation and cardiotoxicity.
Clinical Features:
SSRIs commonly cause sedation and serotonin syndrome; most are benign in single-agent overdose, except citalopram and escitalopram, which may cause QTc prolongation, seizures, and delayed toxicity up to 12 hours.
SNRIs may cause somnolence, vomiting, tachycardia, seizures, and QTc prolongation, especially with venlafaxine and desvenlafaxine.
Atypical antidepressants: bupropion is associated with seizures and QRS/QTc prolongation; trazodone causes sedation, hypotension, QTc prolongation, and priapism; mirtazapine causes sedation and QTc prolongation, with rare neutropenia in chronic use.
Atypical antipsychotics typically cause sedation, tachycardia, and miosis, with drug-specific risks such as agranulocytosis and cardiomyopathy (clozapine), anticholinergic delirium (olanzapine, quetiapine), hypotension (quetiapine), QTc prolongation (ziprasidone), or prolonged CNS effects (aripiprazole).
Initial Assessment: Determine the specific agents, dose, timing, and possible coingestants. Check bedside glucose in patients with altered mental status.
Diagnostic Evaluation:
Laboratory drug levels are rarely helpful acutely. Obtain ECG to assess QRS and QTc intervals. Order electrolytes, renal function, glucose, urine pregnancy test when appropriate, urine drug screen (limited impact on management), acetaminophen and salicylate levels, and serum ethanol. CT brain imaging is reserved for unexplained depressed mental status; chest radiograph is indicated if intubated or hypoxic.
Key Differentials: TCA toxicity, ethanol or sedative–hypnotic overdose, isoniazid toxicity, hypoglycemia, hypoxemia, electrolyte disturbances, withdrawal syndromes, serotonin syndrome, head trauma, opioid intoxication, mood stabilizer or antiepileptic overdose, and diabetic ketoacidosis.
Prehospital Priorities: Transport all medication containers with the patient. Support airway, breathing, and circulation. Administer IV fluids for hypotension and benzodiazepines for seizures.
Early Stabilization: Provide oxygen, continuous cardiac monitoring, IV access, and pulse oximetry. Intubate if airway protection is needed. Check rapid glucose; administer naloxone or dextrose as clinically indicated. Flumazenil is not recommended in mixed or unknown overdoses or in patients with seizure risk. Treat extrapyramidal symptoms with diphenhydramine or benztropine.
Emergency Department Management: Avoid GI decontamination if the airway is unprotected; do not intubate solely for charcoal. Activated charcoal may be considered early after ingestion. Treat QRS widening with IV sodium bicarbonate boluses (continuous infusions are ineffective). Manage hypotension refractory to fluids with norepinephrine rather than dopamine. Treat seizures with benzodiazepines, escalating to barbiturates if refractory. Address serotonin syndrome with benzodiazepines and active cooling.
Medication Options: Activated charcoal 50–75 g PO (up to 100 g); benzodiazepines (diazepam or lorazepam) for seizures/agitation; diphenhydramine or benztropine for EPS; naloxone as indicated; norepinephrine infusion for hypotension; phenobarbital for refractory seizures; sodium bicarbonate 1 mEq/kg IV bolus for QRS widening.
Disposition Planning:
Admit for 24-hour telemetry after ingestion of citalopram, escitalopram, venlafaxine, desvenlafaxine, or bupropion, even if initially asymptomatic. Admit patients with coma, persistent altered mental status, ECG abnormalities, hemodynamic instability, or neuroleptic malignant syndrome. Suicidal patients require 1:1 observation.
Asymptomatic patients more than 6 hours after ingestion of less toxic antidepressants may be medically cleared for psychiatric admission if not suicidal.
Follow-Up Care: Psychiatry referral is required for intentional overdoses.
Clinical Pearls And Pitfalls: Administer IV sodium bicarbonate promptly for QRS widening. Overdoses involving citalopram, venlafaxine, and bupropion are more likely to cause severe toxicity and delayed complications, warranting medical observation before psychiatric clearance.
Core Overview: Antidepressants are among the most commonly prescribed psychiatric medications in the United States. Overdose presentations often involve selective serotonin reuptake inhibitors (SSRIs), serotonin–norepinephrine reuptake inhibitors (SNRIs), or atypical antidepressants, frequently in combination with atypical antipsychotics or mood stabilizers. These agents are also prescribed for chronic pain, anxiety disorders, eating disorders, substance use disorders, and sleep disturbances. Tricyclic antidepressants are discussed separately.
Mechanisms And Causes:
SSRIs increase synaptic serotonin by inhibiting presynaptic reuptake (e.g., fluoxetine, paroxetine, sertraline, citalopram, escitalopram).
SNRIs inhibit reuptake of both serotonin and norepinephrine (e.g., venlafaxine, desvenlafaxine, duloxetine) and may be more toxic in overdose than initially assumed.
Atypical antidepressants have variable effects on serotonin, norepinephrine, and dopamine and include bupropion, trazodone, and mirtazapine.
Atypical antipsychotics act primarily on dopamine receptors with additional serotonergic, α-adrenergic, histaminic, and muscarinic effects. Many psychiatric medications can block potassium and sodium channels, resulting in QT or QRS prolongation and cardiotoxicity.
Clinical Features:
SSRIs commonly cause sedation and serotonin syndrome; most are benign in single-agent overdose, except citalopram and escitalopram, which may cause QTc prolongation, seizures, and delayed toxicity up to 12 hours.
SNRIs may cause somnolence, vomiting, tachycardia, seizures, and QTc prolongation, especially with venlafaxine and desvenlafaxine.
Atypical antidepressants: bupropion is associated with seizures and QRS/QTc prolongation; trazodone causes sedation, hypotension, QTc prolongation, and priapism; mirtazapine causes sedation and QTc prolongation, with rare neutropenia in chronic use.
Atypical antipsychotics typically cause sedation, tachycardia, and miosis, with drug-specific risks such as agranulocytosis and cardiomyopathy (clozapine), anticholinergic delirium (olanzapine, quetiapine), hypotension (quetiapine), QTc prolongation (ziprasidone), or prolonged CNS effects (aripiprazole).
Initial Assessment: Determine the specific agents, dose, timing, and possible coingestants. Check bedside glucose in patients with altered mental status.
Diagnostic Evaluation:
Laboratory drug levels are rarely helpful acutely. Obtain ECG to assess QRS and QTc intervals. Order electrolytes, renal function, glucose, urine pregnancy test when appropriate, urine drug screen (limited impact on management), acetaminophen and salicylate levels, and serum ethanol. CT brain imaging is reserved for unexplained depressed mental status; chest radiograph is indicated if intubated or hypoxic.
Key Differentials: TCA toxicity, ethanol or sedative–hypnotic overdose, isoniazid toxicity, hypoglycemia, hypoxemia, electrolyte disturbances, withdrawal syndromes, serotonin syndrome, head trauma, opioid intoxication, mood stabilizer or antiepileptic overdose, and diabetic ketoacidosis.
Prehospital Priorities: Transport all medication containers with the patient. Support airway, breathing, and circulation. Administer IV fluids for hypotension and benzodiazepines for seizures.
Early Stabilization: Provide oxygen, continuous cardiac monitoring, IV access, and pulse oximetry. Intubate if airway protection is needed. Check rapid glucose; administer naloxone or dextrose as clinically indicated. Flumazenil is not recommended in mixed or unknown overdoses or in patients with seizure risk. Treat extrapyramidal symptoms with diphenhydramine or benztropine.
Emergency Department Management: Avoid GI decontamination if the airway is unprotected; do not intubate solely for charcoal. Activated charcoal may be considered early after ingestion. Treat QRS widening with IV sodium bicarbonate boluses (continuous infusions are ineffective). Manage hypotension refractory to fluids with norepinephrine rather than dopamine. Treat seizures with benzodiazepines, escalating to barbiturates if refractory. Address serotonin syndrome with benzodiazepines and active cooling.
Medication Options: Activated charcoal 50–75 g PO (up to 100 g); benzodiazepines (diazepam or lorazepam) for seizures/agitation; diphenhydramine or benztropine for EPS; naloxone as indicated; norepinephrine infusion for hypotension; phenobarbital for refractory seizures; sodium bicarbonate 1 mEq/kg IV bolus for QRS widening.
Disposition Planning:
Admit for 24-hour telemetry after ingestion of citalopram, escitalopram, venlafaxine, desvenlafaxine, or bupropion, even if initially asymptomatic. Admit patients with coma, persistent altered mental status, ECG abnormalities, hemodynamic instability, or neuroleptic malignant syndrome. Suicidal patients require 1:1 observation.
Asymptomatic patients more than 6 hours after ingestion of less toxic antidepressants may be medically cleared for psychiatric admission if not suicidal.
Follow-Up Care: Psychiatry referral is required for intentional overdoses.
Clinical Pearls And Pitfalls: Administer IV sodium bicarbonate promptly for QRS widening. Overdoses involving citalopram, venlafaxine, and bupropion are more likely to cause severe toxicity and delayed complications, warranting medical observation before psychiatric clearance.
- Published on
Emergency And Acute Medicine - Anticholinergic Poisoning
Core Overview: Anticholinergic poisoning is caused by central and peripheral cholinergic blockade. Depending on the agent, antagonism may occur at muscarinic receptors (most common), nicotinic receptors, or both. Symptoms typically begin 15–30 minutes after ingestion, with effects lasting about 2–24 hours.
Common Causes: Many medications have anticholinergic properties that are usually mild at therapeutic doses but can become life-threatening in overdose. Frequent culprits include antihistamines, belladonna alkaloids and related compounds, antiparkinsonian agents, cyclic antidepressants, antipsychotics (neuroleptics), mydriatic eye drops, skeletal muscle relaxants (e.g., orphenadrine, cyclobenzaprine), antispasmodics, and certain mushrooms/plants (Amanita muscaria, Amanita pantherina, deadly nightshade, mandrake, henbane). Jimson weed may be smoked or ingested.
How It Presents: Clarify timing, dose, and exposure route. The classic toxidrome is often remembered as: “mad as a hatter” (delirium/AMS), “hot as a hare” (hyperthermia), “red as a beet” (flushed skin), “dry as a bone” (dry skin/mucosa), and “blind as a bat” (mydriasis with blurry vision). Findings may include hyperthermia and altered mental status; fixed mydriasis with loss of accommodation; sinus tachycardia, occasional dysrhythmias (typically only in massive ingestions), hypo/HTN, and rarely cardiogenic pulmonary edema; tachypnea or respiratory failure; decreased/absent bowel sounds, dysphagia, decreased GI motility, and reduced salivation; urinary retention; decreased sweating with dry, flushed skin; hallucinations, coma, or seizures.
Essential Evaluation: Diagnosis is clinical, based on toxidrome and a reliable exposure history when possible.
Recommended Tests: Obtain a urine toxicology screen if helpful for context; electrolytes, BUN/creatinine, glucose; CBC; CPK if rhabdomyolysis is a concern; urinalysis; and acetaminophen/salicylate levels to detect occult coingestions (e.g., combination nighttime products). ECG commonly shows sinus tachycardia; may reveal QRS prolongation, AV block, bundle branch block patterns, or dysrhythmias.
Key Differentials: Sympathomimetic intoxication, withdrawal syndromes, acute psychiatric conditions, sepsis, and thyroid disease.
Prehospital Actions: Bring all pills, bottles, and packaging to support accurate identification in the ED.
Immediate Stabilization: Prioritize ABCs—airway control can be critical. Provide supplemental oxygen, establish IV access, initiate cardiac monitoring and pulse oximetry, and consider naloxone, thiamine, and dextrose (D50 or bedside glucose-guided) when altered mental status is present.
Emergency Department Care: Management is largely supportive: IV rehydration with 0.9% NS and aggressive external cooling for hyperthermia. Use benzodiazepines to control agitation and seizures; avoid phenothiazines because they can worsen anticholinergic effects. Treat seizures with benzodiazepines and barbiturates if needed. Manage dysrhythmias with standard agents, but avoid class Ia antiarrhythmics due to quinidine-like effects seen with many anticholinergic drugs; sodium bicarbonate boluses may reverse these sodium-channel blockade effects. For decontamination, give activated charcoal for oral ingestions within about 1 hour when appropriate, and use ocular irrigation for eyedrop exposure.
Antidote Considerations: Physostigmine (Antilirium) is a reversible acetylcholinesterase inhibitor that crosses the blood–brain barrier and can temporarily reverse both central and peripheral effects. Consider it when peripheral anticholinergic signs are present plus severe features such as uncontrolled agitation or seizures not responding to conventional therapy. Use with caution if QRS is prolonged due to risks of dysrhythmias (including asystole), seizures, and cholinergic crises—continuous monitoring is required. Avoid physostigmine in cyclic antidepressant overdose and use caution/avoid in cardiovascular disease, asthma/bronchospasm, intestinal obstruction, heart block, peripheral vascular disease, or bladder obstruction.
Medication Options: Activated charcoal 1 g/kg PO; dextrose 50–100 mL D50 (peds: D25 2 mL/kg over 1 minute) IV and repeat if needed; diazepam 5–10 mg IV (peds 0.2–0.5 mg/kg) q10–15 min; lorazepam 2–4 mg IV (peds 0.03–0.05 mg/kg) q10–15 min; dopamine 2–20 μg/kg/min IV titrated for hypotension; phenobarbital 10–20 mg/kg IV loading dose (monitor respiration); thiamine 100 mg IV/IM (peds 50 mg). For physostigmine, 0.5–2.0 mg IV over 5 min (peds 0.02 mg/kg), repeat in 30–60 min if needed. First-line for agitation/seizures is lorazepam or diazepam; second-line is physostigmine with caution and toxicology input when available.
Disposition Guidance: ICU admission is appropriate for moderate-to-severe toxicity (temperature control, agitation control, seizure/dysrhythmia monitoring) and for any patient receiving physostigmine. Discharge may be reasonable for mild, improving symptoms after 6–8 hours of ED observation.
Referral And Follow-Up: Arrange substance use referral for recreational misuse, poison-prevention counseling for accidental exposures, and psychiatric evaluation for intentional ingestion. Ensure appropriate psychiatric follow-up for intentional overdoses.
Clinical Tips And Common Traps: Treat hyperthermia aggressively—antipyretics do not work for toxic hyperthermia. If physostigmine is considered, use it carefully with continuous monitoring and toxicology consultation when possible.
Core Overview: Anticholinergic poisoning is caused by central and peripheral cholinergic blockade. Depending on the agent, antagonism may occur at muscarinic receptors (most common), nicotinic receptors, or both. Symptoms typically begin 15–30 minutes after ingestion, with effects lasting about 2–24 hours.
Common Causes: Many medications have anticholinergic properties that are usually mild at therapeutic doses but can become life-threatening in overdose. Frequent culprits include antihistamines, belladonna alkaloids and related compounds, antiparkinsonian agents, cyclic antidepressants, antipsychotics (neuroleptics), mydriatic eye drops, skeletal muscle relaxants (e.g., orphenadrine, cyclobenzaprine), antispasmodics, and certain mushrooms/plants (Amanita muscaria, Amanita pantherina, deadly nightshade, mandrake, henbane). Jimson weed may be smoked or ingested.
How It Presents: Clarify timing, dose, and exposure route. The classic toxidrome is often remembered as: “mad as a hatter” (delirium/AMS), “hot as a hare” (hyperthermia), “red as a beet” (flushed skin), “dry as a bone” (dry skin/mucosa), and “blind as a bat” (mydriasis with blurry vision). Findings may include hyperthermia and altered mental status; fixed mydriasis with loss of accommodation; sinus tachycardia, occasional dysrhythmias (typically only in massive ingestions), hypo/HTN, and rarely cardiogenic pulmonary edema; tachypnea or respiratory failure; decreased/absent bowel sounds, dysphagia, decreased GI motility, and reduced salivation; urinary retention; decreased sweating with dry, flushed skin; hallucinations, coma, or seizures.
Essential Evaluation: Diagnosis is clinical, based on toxidrome and a reliable exposure history when possible.
Recommended Tests: Obtain a urine toxicology screen if helpful for context; electrolytes, BUN/creatinine, glucose; CBC; CPK if rhabdomyolysis is a concern; urinalysis; and acetaminophen/salicylate levels to detect occult coingestions (e.g., combination nighttime products). ECG commonly shows sinus tachycardia; may reveal QRS prolongation, AV block, bundle branch block patterns, or dysrhythmias.
Key Differentials: Sympathomimetic intoxication, withdrawal syndromes, acute psychiatric conditions, sepsis, and thyroid disease.
Prehospital Actions: Bring all pills, bottles, and packaging to support accurate identification in the ED.
Immediate Stabilization: Prioritize ABCs—airway control can be critical. Provide supplemental oxygen, establish IV access, initiate cardiac monitoring and pulse oximetry, and consider naloxone, thiamine, and dextrose (D50 or bedside glucose-guided) when altered mental status is present.
Emergency Department Care: Management is largely supportive: IV rehydration with 0.9% NS and aggressive external cooling for hyperthermia. Use benzodiazepines to control agitation and seizures; avoid phenothiazines because they can worsen anticholinergic effects. Treat seizures with benzodiazepines and barbiturates if needed. Manage dysrhythmias with standard agents, but avoid class Ia antiarrhythmics due to quinidine-like effects seen with many anticholinergic drugs; sodium bicarbonate boluses may reverse these sodium-channel blockade effects. For decontamination, give activated charcoal for oral ingestions within about 1 hour when appropriate, and use ocular irrigation for eyedrop exposure.
Antidote Considerations: Physostigmine (Antilirium) is a reversible acetylcholinesterase inhibitor that crosses the blood–brain barrier and can temporarily reverse both central and peripheral effects. Consider it when peripheral anticholinergic signs are present plus severe features such as uncontrolled agitation or seizures not responding to conventional therapy. Use with caution if QRS is prolonged due to risks of dysrhythmias (including asystole), seizures, and cholinergic crises—continuous monitoring is required. Avoid physostigmine in cyclic antidepressant overdose and use caution/avoid in cardiovascular disease, asthma/bronchospasm, intestinal obstruction, heart block, peripheral vascular disease, or bladder obstruction.
Medication Options: Activated charcoal 1 g/kg PO; dextrose 50–100 mL D50 (peds: D25 2 mL/kg over 1 minute) IV and repeat if needed; diazepam 5–10 mg IV (peds 0.2–0.5 mg/kg) q10–15 min; lorazepam 2–4 mg IV (peds 0.03–0.05 mg/kg) q10–15 min; dopamine 2–20 μg/kg/min IV titrated for hypotension; phenobarbital 10–20 mg/kg IV loading dose (monitor respiration); thiamine 100 mg IV/IM (peds 50 mg). For physostigmine, 0.5–2.0 mg IV over 5 min (peds 0.02 mg/kg), repeat in 30–60 min if needed. First-line for agitation/seizures is lorazepam or diazepam; second-line is physostigmine with caution and toxicology input when available.
Disposition Guidance: ICU admission is appropriate for moderate-to-severe toxicity (temperature control, agitation control, seizure/dysrhythmia monitoring) and for any patient receiving physostigmine. Discharge may be reasonable for mild, improving symptoms after 6–8 hours of ED observation.
Referral And Follow-Up: Arrange substance use referral for recreational misuse, poison-prevention counseling for accidental exposures, and psychiatric evaluation for intentional ingestion. Ensure appropriate psychiatric follow-up for intentional overdoses.
Clinical Tips And Common Traps: Treat hyperthermia aggressively—antipyretics do not work for toxic hyperthermia. If physostigmine is considered, use it carefully with continuous monitoring and toxicology consultation when possible.
- Published on
Emergency And Acute Medicine - Ankylosing Spondylitis
Core Overview: Ankylosing spondylitis (AS) is a chronic inflammatory condition that primarily targets the axial skeleton, with a strong predilection for the sacroiliac (SI) joints and spine (SI joints ~100%, cervical ~75%, thoracic ~70%, lumbosacral ~50%; hips and shoulders each ~30%). Inflammation begins at vertebral entheses (outer annulus fibrosus insertions); progressive ossification with syndesmophyte formation can lead to fusion (ankylosis) and the classic brittle “bamboo spine” appearance on imaging. Typical onset is age 15–35 years, with a male predominance (about 2–3:1). ALERT: Patients with AS have markedly increased risk of spinal fracture and paralysis—serious injury can occur after relatively minor trauma.
Risk Profile: Genetics are strongly associated with AS; HLA-B27 is present in roughly 80–90% of affected patients.
Likely Cause: AS is thought to be triggered by environmental factors (often presumed infectious exposures) in genetically predisposed individuals.
Clinical Presentation: The most common presentation is inflammatory low back pain with sacroiliitis—often worse with rest and improved with movement/exercise, and may wake the patient in the second half of the night. Because the spine may be rigid and brittle, patients are at higher risk for major injury from low-energy mechanisms. Extraspinal inflammatory manifestations may occur and sometimes precede spinal symptoms, including uveitis (common; often acute, unilateral, alternating), mild increased CAD risk and valvular disease over time, restrictive lung disease from limited chest expansion and fibrosis, GI associations (notably inflammatory bowel disease in a minority), and renal risks (IgA nephropathy/amyloidosis and NSAID-related nephropathy). Enthesitis is common, frequently presenting as Achilles tendinopathy or plantar fasciitis.
History And Examination: History often features insidious back pain for >3 months in patients <40 years, radiating into the gluteal region from si area and gradually involving more of spine; ask about prior uveitis, ibd, pulmonary restriction, enthesitis, or migrating />olyarthritis. On exam, SI joint tenderness may be reproduced with direct pressure over both ASIS simultaneously; additional findings can include enthesitis or dactylitis, loss of lumbar lordosis, increased thoracic kyphosis, reduced spinal mobility, and decreased chest expansion. Pediatric Note: Juvenile AS (often boys, late childhood/adolescence) may be mistaken for recurrent sprains; it more commonly involves extraspinal joints and lower-extremity entheses—look for asymmetric pauciarthritis and ankle/knee/tarsal enthesitis, plantar fasciitis, and Achilles tendinopathy.
Key Emergency Evaluation: In any patient with known or suspected AS who develops new spinal pain (even without clear trauma), prioritize exclusion of fracture and neurologic injury; also exclude sepsis or septic joint when clinically suspected. Sacroiliitis can be assessed with pelvic compression (“pelvic rock”) or Patrick/FABER-type maneuvers that stress the SI region.
Investigations And Interpretation: CBC may show mild leukocytosis, mild–moderate anemia, and thrombocytosis; BMP can help assess renal involvement, and ESR/CRP may be elevated but are not reliably decisive in the ED. HLA-B27 testing is typically arranged by specialists and a negative result does not exclude AS. Pelvic radiographs are appropriate when undiagnosed AS is suspected; early sacroiliitis may appear as iliac-side subchondral erosions that later progress to sclerosis and bony proliferation—if plain films are unrevealing and suspicion remains, MRI should be considered. For any new spinal pain, obtain spine imaging to exclude fracture; CT is often needed to further evaluate suspected fractures, and MRI is urgent when neurologic deficits are present. CXR may show apical fibrosis or patchy inflammatory changes. ECG is reasonable with ACS symptoms or arrhythmia concerns (including AV block), and echocardiography is indicated for a new murmur or new heart-failure evidence given the increased risk of aortic insufficiency over time.
Conditions To Distinguish From AS: Consider juvenile AS (onset <20 with more enthesitis />xtraspinal involvement), reactive arthritis, enteropathic arthritis (Crohn/UC-associated), psoriatic arthritis (rash; dactylitis), septic arthritis (arthrocentesis if suspected monoarthritis), mechanical low back pain (improves with rest; worsens with exertion; lacks systemic inflammatory features), spinal epidural abscess (often constant, severe, may have fever/IVDA/immunosuppression), and neoplastic back pain (older age, night pain, persistent/unremitting).
Prehospital Priorities: ALERT: Because minor trauma can cause unstable spinal injury, immobilization should avoid forcing the spine into a neutral position; cushioning and transport in the position of comfort (e.g., scoop stretcher with padding) may be safer than rigid collar/backboard alone. Anticipate difficult airway management due to cervical/TMJ limitation—fiberoptic techniques are often preferred; consider temporizing strategies (e.g., LMA or BVM with airway adjunct) until a definitive airway can be secured safely. Ventilation may be challenging due to chest-wall restriction and fibrosis, and CPR may carry higher rib-fracture risk.
Emergency Department Management: If cord compression is suspected, obtain MRI urgently. For any new spinal pain, aggressively evaluate for fracture—CT may be required even when initial radiographs are unrevealing. If infection is a concern, pursue labs and arthrocentesis as indicated. Treat pain and inflammation, typically starting with NSAIDs when appropriate.
Medications: Use nonselective NSAIDs such as ibuprofen, indomethacin (often limited by GI/CNS adverse effects), or naproxen; COX-2 inhibitors (e.g., celecoxib) can be considered, especially when GI bleeding risk is elevated. TNF-α inhibitors (e.g., adalimumab, etanercept) are disease-modifying options typically initiated in specialist care. In pregnancy, avoid NSAIDs when possible—use acetaminophen first-line and opioids second-line if needed. In older adults, weigh NSAID risks (CV, GI bleed, renal injury, hypertension) and consider gastroprotection (H2 blocker/PPI) or COX-2 selection when appropriate. If NSAIDs/acetaminophen are ineffective at appropriate doses, second-line options may include opioid analgesics, muscle relaxants, or short courses of low-dose steroids in select cases.
Disposition Planning: Admit for acute neurologic deficits, uncontrolled pain, or when sepsis/septic joint cannot be excluded. Discharge may be reasonable when serious injury and neurologic deficit have been ruled out and pain is controlled to a safe level.
Referral And Follow-Up: Encourage a medical alert bracelet due to high trauma risk. Arrange rheumatology referral for suspected new AS or for escalation to immunomodulating therapy, and consider physical medicine/rehab for splints and orthoses (e.g., heel cushioning to unload Achilles enthesis). Advise primary care reassessment within 1–2 weeks to gauge response, with earlier review for patients at higher risk of NSAID complications (elderly, hypertensive, high GI-bleed risk).
Clinical Tips And Common Traps: Anticipate a difficult airway and avoid neck repositioning because cervical instability and severe rigidity can make standard techniques hazardous—use airway adjuncts and pursue fiberoptic intubation when feasible. Immobilization should prioritize the patient’s position of comfort with padding rather than forcing standard collar/backboard alignment. Maintain high suspicion for fracture and cord injury after even low-energy trauma, as seemingly minor mechanisms can cause catastrophic spinal injury in AS.
Core Overview: Ankylosing spondylitis (AS) is a chronic inflammatory condition that primarily targets the axial skeleton, with a strong predilection for the sacroiliac (SI) joints and spine (SI joints ~100%, cervical ~75%, thoracic ~70%, lumbosacral ~50%; hips and shoulders each ~30%). Inflammation begins at vertebral entheses (outer annulus fibrosus insertions); progressive ossification with syndesmophyte formation can lead to fusion (ankylosis) and the classic brittle “bamboo spine” appearance on imaging. Typical onset is age 15–35 years, with a male predominance (about 2–3:1). ALERT: Patients with AS have markedly increased risk of spinal fracture and paralysis—serious injury can occur after relatively minor trauma.
Risk Profile: Genetics are strongly associated with AS; HLA-B27 is present in roughly 80–90% of affected patients.
Likely Cause: AS is thought to be triggered by environmental factors (often presumed infectious exposures) in genetically predisposed individuals.
Clinical Presentation: The most common presentation is inflammatory low back pain with sacroiliitis—often worse with rest and improved with movement/exercise, and may wake the patient in the second half of the night. Because the spine may be rigid and brittle, patients are at higher risk for major injury from low-energy mechanisms. Extraspinal inflammatory manifestations may occur and sometimes precede spinal symptoms, including uveitis (common; often acute, unilateral, alternating), mild increased CAD risk and valvular disease over time, restrictive lung disease from limited chest expansion and fibrosis, GI associations (notably inflammatory bowel disease in a minority), and renal risks (IgA nephropathy/amyloidosis and NSAID-related nephropathy). Enthesitis is common, frequently presenting as Achilles tendinopathy or plantar fasciitis.
History And Examination: History often features insidious back pain for >3 months in patients <40 years, radiating into the gluteal region from si area and gradually involving more of spine; ask about prior uveitis, ibd, pulmonary restriction, enthesitis, or migrating />olyarthritis. On exam, SI joint tenderness may be reproduced with direct pressure over both ASIS simultaneously; additional findings can include enthesitis or dactylitis, loss of lumbar lordosis, increased thoracic kyphosis, reduced spinal mobility, and decreased chest expansion. Pediatric Note: Juvenile AS (often boys, late childhood/adolescence) may be mistaken for recurrent sprains; it more commonly involves extraspinal joints and lower-extremity entheses—look for asymmetric pauciarthritis and ankle/knee/tarsal enthesitis, plantar fasciitis, and Achilles tendinopathy.
Key Emergency Evaluation: In any patient with known or suspected AS who develops new spinal pain (even without clear trauma), prioritize exclusion of fracture and neurologic injury; also exclude sepsis or septic joint when clinically suspected. Sacroiliitis can be assessed with pelvic compression (“pelvic rock”) or Patrick/FABER-type maneuvers that stress the SI region.
Investigations And Interpretation: CBC may show mild leukocytosis, mild–moderate anemia, and thrombocytosis; BMP can help assess renal involvement, and ESR/CRP may be elevated but are not reliably decisive in the ED. HLA-B27 testing is typically arranged by specialists and a negative result does not exclude AS. Pelvic radiographs are appropriate when undiagnosed AS is suspected; early sacroiliitis may appear as iliac-side subchondral erosions that later progress to sclerosis and bony proliferation—if plain films are unrevealing and suspicion remains, MRI should be considered. For any new spinal pain, obtain spine imaging to exclude fracture; CT is often needed to further evaluate suspected fractures, and MRI is urgent when neurologic deficits are present. CXR may show apical fibrosis or patchy inflammatory changes. ECG is reasonable with ACS symptoms or arrhythmia concerns (including AV block), and echocardiography is indicated for a new murmur or new heart-failure evidence given the increased risk of aortic insufficiency over time.
Conditions To Distinguish From AS: Consider juvenile AS (onset <20 with more enthesitis />xtraspinal involvement), reactive arthritis, enteropathic arthritis (Crohn/UC-associated), psoriatic arthritis (rash; dactylitis), septic arthritis (arthrocentesis if suspected monoarthritis), mechanical low back pain (improves with rest; worsens with exertion; lacks systemic inflammatory features), spinal epidural abscess (often constant, severe, may have fever/IVDA/immunosuppression), and neoplastic back pain (older age, night pain, persistent/unremitting).
Prehospital Priorities: ALERT: Because minor trauma can cause unstable spinal injury, immobilization should avoid forcing the spine into a neutral position; cushioning and transport in the position of comfort (e.g., scoop stretcher with padding) may be safer than rigid collar/backboard alone. Anticipate difficult airway management due to cervical/TMJ limitation—fiberoptic techniques are often preferred; consider temporizing strategies (e.g., LMA or BVM with airway adjunct) until a definitive airway can be secured safely. Ventilation may be challenging due to chest-wall restriction and fibrosis, and CPR may carry higher rib-fracture risk.
Emergency Department Management: If cord compression is suspected, obtain MRI urgently. For any new spinal pain, aggressively evaluate for fracture—CT may be required even when initial radiographs are unrevealing. If infection is a concern, pursue labs and arthrocentesis as indicated. Treat pain and inflammation, typically starting with NSAIDs when appropriate.
Medications: Use nonselective NSAIDs such as ibuprofen, indomethacin (often limited by GI/CNS adverse effects), or naproxen; COX-2 inhibitors (e.g., celecoxib) can be considered, especially when GI bleeding risk is elevated. TNF-α inhibitors (e.g., adalimumab, etanercept) are disease-modifying options typically initiated in specialist care. In pregnancy, avoid NSAIDs when possible—use acetaminophen first-line and opioids second-line if needed. In older adults, weigh NSAID risks (CV, GI bleed, renal injury, hypertension) and consider gastroprotection (H2 blocker/PPI) or COX-2 selection when appropriate. If NSAIDs/acetaminophen are ineffective at appropriate doses, second-line options may include opioid analgesics, muscle relaxants, or short courses of low-dose steroids in select cases.
Disposition Planning: Admit for acute neurologic deficits, uncontrolled pain, or when sepsis/septic joint cannot be excluded. Discharge may be reasonable when serious injury and neurologic deficit have been ruled out and pain is controlled to a safe level.
Referral And Follow-Up: Encourage a medical alert bracelet due to high trauma risk. Arrange rheumatology referral for suspected new AS or for escalation to immunomodulating therapy, and consider physical medicine/rehab for splints and orthoses (e.g., heel cushioning to unload Achilles enthesis). Advise primary care reassessment within 1–2 weeks to gauge response, with earlier review for patients at higher risk of NSAID complications (elderly, hypertensive, high GI-bleed risk).
Clinical Tips And Common Traps: Anticipate a difficult airway and avoid neck repositioning because cervical instability and severe rigidity can make standard techniques hazardous—use airway adjuncts and pursue fiberoptic intubation when feasible. Immobilization should prioritize the patient’s position of comfort with padding rather than forcing standard collar/backboard alignment. Maintain high suspicion for fracture and cord injury after even low-energy trauma, as seemingly minor mechanisms can cause catastrophic spinal injury in AS.
- Published on
Emergency and Acute Medicine – Ankle Sprain
Core Description
Ankle sprains involve injury to the ligamentous stabilizers of the ankle joint, a hinge joint formed by the tibia, fibula, and talus. Injury severity ranges from ligament stretching with microscopic damage (grade I), to partial tearing (grade II), to complete ligament rupture (grade III).
Mechanisms And Causes
Ankle sprains most often result from forced inversion or eversion, frequently during sports or collisions. Approximately 85–90% involve the lateral ligament complex, including the anterior talofibular, posterior talofibular, and calcaneofibular ligaments. Inversion injury most commonly affects the anterior talofibular ligament; calcaneofibular ligament injury is more likely when the ankle is in neutral position, while isolated posterior talofibular ligament injury is rare. Deltoid ligament injuries typically result from eversion and are often associated with medial malleolar avulsion or talar insertion injury; isolated deltoid injuries are uncommon and should raise concern for associated lateral malleolus or proximal fibular (Maisonneuve) fracture. Syndesmotic sprains involve the distal tibiofibular ligaments, occur frequently in collision sports, and carry higher morbidity with risk of long-term complications. In children younger than 10 years, traumatic ankle pain with normal radiographs most commonly represents a Salter–Harris type I fracture, as the physis is weaker than surrounding ligaments.
Clinical Presentation
Patients usually present with ankle pain, swelling, and difficulty bearing weight. History should include time and mechanism of injury, presence of a pop or crack, prior ankle trauma, relevant medical conditions, treatments attempted before arrival, and ability to bear weight at the scene and in the emergency department. Physical examination focuses on detecting instability and associated injury, including bony tenderness along the posterior edges of the medial and lateral malleoli and the base of the fifth metatarsal, distal neurovascular status, and comparison of range of motion with the uninjured side. Stress testing is often limited by pain. The squeeze test helps identify syndesmotic injury when compression of the tibia and fibula at the midcalf reproduces ankle pain.
Imaging Decision Strategy
The Ottawa Ankle Rules provide a validated approach for determining the need for radiographs. Imaging is recommended for bony tenderness at the posterior edge or distal 6 cm of either malleolus, tenderness at the base of the fifth metatarsal or navicular, or inability to bear weight for four unassisted steps both immediately after injury and in the emergency department.
Diagnostic Evaluation
Radiographs should be obtained when fracture is suspected. Stress radiographs are rarely useful acutely and should not be routinely ordered unless requested by a consultant.
Differential Considerations
Ankle fracture or dislocation, Achilles tendon rupture, Maisonneuve fracture, os trigonum fracture, fifth metatarsal fracture, talar dome lesion, and peroneal tendon injury should be considered.
Initial Management
Prehospital care includes immobilization as needed to reduce pain and prevent further injury.
Emergency Department Care
Initial therapy focuses on preventing further injury and avoiding painful weight bearing using rest, ice, compression, and elevation. Treatment aims to reduce pain and restore function without chronic instability. Evidence supports early mobilization with functional treatment. Grade I and II sprains are managed with elastic bandaging combined with an air-stirrup or gel splint and weight bearing as tolerated. Grade III sprains or those with severe pain may benefit from brief immobilization followed by early functional rehabilitation and orthopedic referral. Crutches may be used initially for comfort. Once swelling and pain resolve, strengthening and proprioceptive exercises improve recovery and reduce reinjury. Return to sports should occur only when running and directional changes are pain free. Bracing or taping reduces recurrence in high-risk sports.
Pharmacologic Therapy
NSAIDs are effective for acute pain control, including oral ibuprofen or topical diclofenac gel. Opioid analgesics may be required for severe pain.
Disposition And Follow-Up
Isolated ankle sprains do not require admission and may be discharged with appropriate treatment, prescriptions, and aftercare instructions. Copies of radiographs may assist early follow-up. Grade I and II sprains should follow up with primary care within 1–2 weeks, while grade III sprains and syndesmotic injuries require orthopedic or sports medicine evaluation within 7–10 days.
Clinical Pearls And Common Errors
Appropriate application of the Ottawa Ankle Rules reduces unnecessary imaging. Functional treatment with early mobilization shortens recovery time, while prolonged immobilization increases the risk of chronic pain and recurrent instability.
Core Description
Ankle sprains involve injury to the ligamentous stabilizers of the ankle joint, a hinge joint formed by the tibia, fibula, and talus. Injury severity ranges from ligament stretching with microscopic damage (grade I), to partial tearing (grade II), to complete ligament rupture (grade III).
Mechanisms And Causes
Ankle sprains most often result from forced inversion or eversion, frequently during sports or collisions. Approximately 85–90% involve the lateral ligament complex, including the anterior talofibular, posterior talofibular, and calcaneofibular ligaments. Inversion injury most commonly affects the anterior talofibular ligament; calcaneofibular ligament injury is more likely when the ankle is in neutral position, while isolated posterior talofibular ligament injury is rare. Deltoid ligament injuries typically result from eversion and are often associated with medial malleolar avulsion or talar insertion injury; isolated deltoid injuries are uncommon and should raise concern for associated lateral malleolus or proximal fibular (Maisonneuve) fracture. Syndesmotic sprains involve the distal tibiofibular ligaments, occur frequently in collision sports, and carry higher morbidity with risk of long-term complications. In children younger than 10 years, traumatic ankle pain with normal radiographs most commonly represents a Salter–Harris type I fracture, as the physis is weaker than surrounding ligaments.
Clinical Presentation
Patients usually present with ankle pain, swelling, and difficulty bearing weight. History should include time and mechanism of injury, presence of a pop or crack, prior ankle trauma, relevant medical conditions, treatments attempted before arrival, and ability to bear weight at the scene and in the emergency department. Physical examination focuses on detecting instability and associated injury, including bony tenderness along the posterior edges of the medial and lateral malleoli and the base of the fifth metatarsal, distal neurovascular status, and comparison of range of motion with the uninjured side. Stress testing is often limited by pain. The squeeze test helps identify syndesmotic injury when compression of the tibia and fibula at the midcalf reproduces ankle pain.
Imaging Decision Strategy
The Ottawa Ankle Rules provide a validated approach for determining the need for radiographs. Imaging is recommended for bony tenderness at the posterior edge or distal 6 cm of either malleolus, tenderness at the base of the fifth metatarsal or navicular, or inability to bear weight for four unassisted steps both immediately after injury and in the emergency department.
Diagnostic Evaluation
Radiographs should be obtained when fracture is suspected. Stress radiographs are rarely useful acutely and should not be routinely ordered unless requested by a consultant.
Differential Considerations
Ankle fracture or dislocation, Achilles tendon rupture, Maisonneuve fracture, os trigonum fracture, fifth metatarsal fracture, talar dome lesion, and peroneal tendon injury should be considered.
Initial Management
Prehospital care includes immobilization as needed to reduce pain and prevent further injury.
Emergency Department Care
Initial therapy focuses on preventing further injury and avoiding painful weight bearing using rest, ice, compression, and elevation. Treatment aims to reduce pain and restore function without chronic instability. Evidence supports early mobilization with functional treatment. Grade I and II sprains are managed with elastic bandaging combined with an air-stirrup or gel splint and weight bearing as tolerated. Grade III sprains or those with severe pain may benefit from brief immobilization followed by early functional rehabilitation and orthopedic referral. Crutches may be used initially for comfort. Once swelling and pain resolve, strengthening and proprioceptive exercises improve recovery and reduce reinjury. Return to sports should occur only when running and directional changes are pain free. Bracing or taping reduces recurrence in high-risk sports.
Pharmacologic Therapy
NSAIDs are effective for acute pain control, including oral ibuprofen or topical diclofenac gel. Opioid analgesics may be required for severe pain.
Disposition And Follow-Up
Isolated ankle sprains do not require admission and may be discharged with appropriate treatment, prescriptions, and aftercare instructions. Copies of radiographs may assist early follow-up. Grade I and II sprains should follow up with primary care within 1–2 weeks, while grade III sprains and syndesmotic injuries require orthopedic or sports medicine evaluation within 7–10 days.
Clinical Pearls And Common Errors
Appropriate application of the Ottawa Ankle Rules reduces unnecessary imaging. Functional treatment with early mobilization shortens recovery time, while prolonged immobilization increases the risk of chronic pain and recurrent instability.
- Published on
Emergency and Acute Medicine – Juvenile Idiopathic Arthritis
Overview And Definition
Juvenile idiopathic arthritis (JIA), formerly termed juvenile rheumatoid arthritis, represents a group of chronic inflammatory arthritides beginning before 17 years of age and persisting for more than six weeks without an identifiable cause. It is the most common chronic rheumatologic disease of childhood, affecting up to 1 in 1,000 children, with a female predominance in most subtypes. JIA encompasses a heterogeneous spectrum of disease, and fewer than half of affected children achieve complete remission, with many experiencing relapsing or persistent disease into adulthood.
Pathophysiology And Disease Classification
JIA is believed to result from immune dysregulation triggered by environmental factors in genetically predisposed children. The condition is classified into several subtypes based on joint involvement, symmetry, systemic features, laboratory findings, and family history. These include systemic-onset, pauciarticular, polyarticular (RF-positive and RF-negative), psoriatic, enthesitis-related, and unclassified forms. Prognosis varies by subtype, with pauciarticular disease generally carrying the most favorable outcome.
Clinical Subtypes And Presentations
Systemic-onset JIA accounts for a minority of cases and affects boys and girls equally. It is characterized by high, quotidian fevers lasting longer than two weeks, often accompanied by arthritis that may appear weeks to months after fever onset. Additional features may include a transient salmon-colored rash, lymphadenopathy, hepatosplenomegaly, or serositis. These patients often appear acutely ill and are at significant risk for macrophage activation syndrome, a life-threatening hyperinflammatory condition with high mortality.
Pauciarticular JIA is the most common subtype and typically affects young girls between two and four years of age. It involves four or fewer joints within the first six months, most often the knees, and presents insidiously in otherwise well-appearing children. Uveitis occurs in a substantial proportion and may be asymptomatic, necessitating routine ophthalmologic screening. Some children progress to extended disease with a worse prognosis.
Polyarticular JIA involves five or more joints within six months and may resemble adult rheumatoid arthritis, particularly in older girls with positive rheumatoid factor. Joint involvement is often symmetric, affecting both small and large joints, and may include the cervical spine and temporomandibular joint. Systemic symptoms are generally mild, limited to fatigue or anemia.
Psoriatic JIA presents with asymmetric arthritis of large joints, frequently involving the lower extremities or spine, and may be associated with psoriasis, dactylitis, nail pitting, or a family history of psoriasis. Enthesitis-related arthritis primarily affects older boys and involves lower extremity joints and the sacroiliac region, often accompanied by limited spinal motion and uveitis.
History And Physical Examination
The hallmark presentation of JIA is gradual-onset joint stiffness and swelling that is worse in the morning or after periods of inactivity and improves with movement. Children with systemic-onset disease are more likely to present to the emergency department due to acute illness, whereas other subtypes evolve slowly. Rapid onset of severe pain, warmth, and erythema in a joint is atypical for JIA and should prompt evaluation for infection or other inflammatory causes. Physical examination should focus on identifying systemic illness, documenting joint involvement, assessing range of motion, and noting signs of inflammation or functional impairment.
Initial Evaluation And Diagnostic Strategy
The primary objectives in the acute setting are to exclude septic arthritis, malignancy, and other identifiable causes of joint inflammation, as well as complications related to long-term immunosuppressive therapy. Basic laboratory studies include complete blood count and inflammatory markers, with blood cultures added if the child appears ill. Additional testing such as ANA, RF, HLA-B27, and liver enzymes may aid in subtype classification. Imaging with plain radiographs may show early soft tissue swelling and effusion, with later findings including osteoporosis and joint destruction. Ultrasound is helpful for detecting small effusions and guiding arthrocentesis when infection is suspected.
Differential Diagnostic Considerations
The differential diagnosis is broad and includes trauma, septic arthritis, viral or bacterial infections, Lyme disease in endemic regions, rheumatic fever, connective tissue diseases, orthopedic disorders such as Legg–Calvé–Perthes disease, and malignancy. Severe pain out of proportion to exam findings or midshaft bone pain should raise concern for neoplasm.
Management In The Emergency Setting
Emergency care focuses on identifying serious alternative diagnoses and stabilizing ill-appearing children. Toxic-appearing patients require prompt supportive care, including oxygen and intravenous access. For known JIA patients presenting with disease flares, management should be coordinated with the child’s rheumatologist. Antibiotics are reserved for confirmed or strongly suspected joint infection.
Pharmacologic Therapy Principles
Treatment strategies aim to control inflammation, preserve joint function, and support normal growth. Mild forms of JIA may respond to nonsteroidal anti-inflammatory drugs alone, while more severe or systemic disease often necessitates disease-modifying antirheumatic drugs or biologic agents. Early aggressive therapy is now common to reduce long-term complications. NSAIDs remain first-line for many patients, while intra-articular corticosteroid injections can provide prolonged relief in selected joints. Systemic corticosteroids, methotrexate, sulfasalazine, and biologic agents targeting specific cytokines are used based on disease severity and subtype, with careful monitoring for immunosuppression and adverse effects.
Disposition And Long-Term Care
Hospital admission is indicated when diagnosis is uncertain, the child appears systemically ill, or septic arthritis is suspected. Most stable patients without infection may be discharged once pain is controlled and follow-up is assured. Long-term management requires regular rheumatology care, and children—particularly those with pauciarticular disease—must undergo frequent ophthalmologic examinations to detect silent uveitis before irreversible damage occurs.
Key Clinical Insights And Common Pitfalls
Always exclude acute joint infection, particularly in endemic areas for Lyme disease. Prolonged daily fevers with arthritis unresponsive to antibiotics should prompt consideration of systemic-onset JIA. Be vigilant for macrophage activation syndrome in children with systemic disease who appear septic or deteriorate rapidly. A careful review of current medications is essential to identify adverse effects or immunosuppression that may alter presentation and risk.
Overview And Definition
Juvenile idiopathic arthritis (JIA), formerly termed juvenile rheumatoid arthritis, represents a group of chronic inflammatory arthritides beginning before 17 years of age and persisting for more than six weeks without an identifiable cause. It is the most common chronic rheumatologic disease of childhood, affecting up to 1 in 1,000 children, with a female predominance in most subtypes. JIA encompasses a heterogeneous spectrum of disease, and fewer than half of affected children achieve complete remission, with many experiencing relapsing or persistent disease into adulthood.
Pathophysiology And Disease Classification
JIA is believed to result from immune dysregulation triggered by environmental factors in genetically predisposed children. The condition is classified into several subtypes based on joint involvement, symmetry, systemic features, laboratory findings, and family history. These include systemic-onset, pauciarticular, polyarticular (RF-positive and RF-negative), psoriatic, enthesitis-related, and unclassified forms. Prognosis varies by subtype, with pauciarticular disease generally carrying the most favorable outcome.
Clinical Subtypes And Presentations
Systemic-onset JIA accounts for a minority of cases and affects boys and girls equally. It is characterized by high, quotidian fevers lasting longer than two weeks, often accompanied by arthritis that may appear weeks to months after fever onset. Additional features may include a transient salmon-colored rash, lymphadenopathy, hepatosplenomegaly, or serositis. These patients often appear acutely ill and are at significant risk for macrophage activation syndrome, a life-threatening hyperinflammatory condition with high mortality.
Pauciarticular JIA is the most common subtype and typically affects young girls between two and four years of age. It involves four or fewer joints within the first six months, most often the knees, and presents insidiously in otherwise well-appearing children. Uveitis occurs in a substantial proportion and may be asymptomatic, necessitating routine ophthalmologic screening. Some children progress to extended disease with a worse prognosis.
Polyarticular JIA involves five or more joints within six months and may resemble adult rheumatoid arthritis, particularly in older girls with positive rheumatoid factor. Joint involvement is often symmetric, affecting both small and large joints, and may include the cervical spine and temporomandibular joint. Systemic symptoms are generally mild, limited to fatigue or anemia.
Psoriatic JIA presents with asymmetric arthritis of large joints, frequently involving the lower extremities or spine, and may be associated with psoriasis, dactylitis, nail pitting, or a family history of psoriasis. Enthesitis-related arthritis primarily affects older boys and involves lower extremity joints and the sacroiliac region, often accompanied by limited spinal motion and uveitis.
History And Physical Examination
The hallmark presentation of JIA is gradual-onset joint stiffness and swelling that is worse in the morning or after periods of inactivity and improves with movement. Children with systemic-onset disease are more likely to present to the emergency department due to acute illness, whereas other subtypes evolve slowly. Rapid onset of severe pain, warmth, and erythema in a joint is atypical for JIA and should prompt evaluation for infection or other inflammatory causes. Physical examination should focus on identifying systemic illness, documenting joint involvement, assessing range of motion, and noting signs of inflammation or functional impairment.
Initial Evaluation And Diagnostic Strategy
The primary objectives in the acute setting are to exclude septic arthritis, malignancy, and other identifiable causes of joint inflammation, as well as complications related to long-term immunosuppressive therapy. Basic laboratory studies include complete blood count and inflammatory markers, with blood cultures added if the child appears ill. Additional testing such as ANA, RF, HLA-B27, and liver enzymes may aid in subtype classification. Imaging with plain radiographs may show early soft tissue swelling and effusion, with later findings including osteoporosis and joint destruction. Ultrasound is helpful for detecting small effusions and guiding arthrocentesis when infection is suspected.
Differential Diagnostic Considerations
The differential diagnosis is broad and includes trauma, septic arthritis, viral or bacterial infections, Lyme disease in endemic regions, rheumatic fever, connective tissue diseases, orthopedic disorders such as Legg–Calvé–Perthes disease, and malignancy. Severe pain out of proportion to exam findings or midshaft bone pain should raise concern for neoplasm.
Management In The Emergency Setting
Emergency care focuses on identifying serious alternative diagnoses and stabilizing ill-appearing children. Toxic-appearing patients require prompt supportive care, including oxygen and intravenous access. For known JIA patients presenting with disease flares, management should be coordinated with the child’s rheumatologist. Antibiotics are reserved for confirmed or strongly suspected joint infection.
Pharmacologic Therapy Principles
Treatment strategies aim to control inflammation, preserve joint function, and support normal growth. Mild forms of JIA may respond to nonsteroidal anti-inflammatory drugs alone, while more severe or systemic disease often necessitates disease-modifying antirheumatic drugs or biologic agents. Early aggressive therapy is now common to reduce long-term complications. NSAIDs remain first-line for many patients, while intra-articular corticosteroid injections can provide prolonged relief in selected joints. Systemic corticosteroids, methotrexate, sulfasalazine, and biologic agents targeting specific cytokines are used based on disease severity and subtype, with careful monitoring for immunosuppression and adverse effects.
Disposition And Long-Term Care
Hospital admission is indicated when diagnosis is uncertain, the child appears systemically ill, or septic arthritis is suspected. Most stable patients without infection may be discharged once pain is controlled and follow-up is assured. Long-term management requires regular rheumatology care, and children—particularly those with pauciarticular disease—must undergo frequent ophthalmologic examinations to detect silent uveitis before irreversible damage occurs.
Key Clinical Insights And Common Pitfalls
Always exclude acute joint infection, particularly in endemic areas for Lyme disease. Prolonged daily fevers with arthritis unresponsive to antibiotics should prompt consideration of systemic-onset JIA. Be vigilant for macrophage activation syndrome in children with systemic disease who appear septic or deteriorate rapidly. A careful review of current medications is essential to identify adverse effects or immunosuppression that may alter presentation and risk.
- Published on
Emergency and Acute Medicine – Rheumatoid Arthritis
Clinical Overview
Rheumatoid arthritis is a chronic, systemic inflammatory disease characterized by persistent, noninfectious synovitis that leads to progressive destruction of articular cartilage, joint deformity, and eventual ankylosis. The disease most commonly affects peripheral joints in a symmetric pattern and is associated with significant extra-articular involvement. Knee involvement is frequent, and chronic inflammation may result in Baker cyst formation. Axial disease is typically limited to the cervical spine, where atlantoaxial subluxation may occur and, rarely, cause spinal cord compression. Rheumatoid arthritis is distinct from juvenile idiopathic arthritis, which represents a separate pediatric condition.
Epidemiology And Pathogenesis
The etiology remains unknown, though autoimmune mechanisms likely triggered by environmental factors in genetically predisposed individuals are implicated. An association with HLA-DR4 has been identified. The condition affects approximately 1% of the global population, with a female predominance of roughly 3:1. Onset most commonly occurs between 30 and 50 years of age.
Clinical Manifestations
Early symptoms are often nonspecific and include fatigue, malaise, and diffuse musculoskeletal discomfort. Over weeks to months, patients develop warm, swollen, painful joints, classically worse in the morning with stiffness lasting longer than one hour. Joint involvement is usually symmetric and polyarticular, beginning in the small joints of the hands and feet and later involving the wrists, elbows, and knees. Distal interphalangeal joint involvement is uncommon and should prompt consideration of alternative diagnoses. Synovitis progresses gradually, and long-standing disease leads to characteristic deformities such as ulnar deviation of the metacarpophalangeal joints, swan-neck deformities, and boutonnière deformities.
Extra-articular manifestations are common and include subcutaneous rheumatoid nodules, vasculitis, pericarditis or myocarditis, pulmonary fibrosis or pneumonitis, Sjögren syndrome, and mononeuritis multiplex. Mild pericarditis may be present in a significant proportion of patients and may warrant electrocardiographic evaluation. Emergency department presentations often relate to disease flares or complications affecting other organ systems, including airway compromise from cricoarytenoid arthritis, cardiac conduction abnormalities, pulmonary disease, hepatic involvement, or neurologic deficits related to cervical spine instability. Ocular complications such as scleritis, episcleritis, iritis, or retinal vasculitis should be suspected in patients with red eye, photophobia, or vision changes and require urgent ophthalmologic evaluation. Chronic medication use may result in infections, osteopenia, fractures, metabolic disturbances, glaucoma, cataracts, or gastrointestinal bleeding.
Diagnostic Approach In The Emergency Setting
A definitive diagnosis of rheumatoid arthritis is rarely established in the emergency department. Diagnostic criteria require synovitis lasting at least six weeks and fulfillment of established classification criteria. Emergency evaluation should instead focus on excluding alternative or immediately life-threatening causes of arthritis, particularly septic arthritis, gout, or reactive arthritis. Arthrocentesis is indicated when infection or crystal-induced disease is a concern. A careful history should assess systemic symptoms such as weight loss, fever, weakness, bursitis, or tendonitis.
Laboratory And Imaging Evaluation
Laboratory studies may reveal mild anemia, leukocytosis, thrombocytosis, elevated erythrocyte sedimentation rate, and increased C-reactive protein, which correlates with erosive disease. Rheumatoid factor is positive in the majority of patients, while antinuclear antibodies may be present in a subset. Synovial fluid analysis typically shows an inflammatory profile with elevated white blood cell counts and neutrophil predominance, without organisms or crystals. Imaging may demonstrate joint effusions, juxta-articular erosions, joint space narrowing, and loss of cartilage. MRI can detect early inflammatory changes before radiographic abnormalities. Chest imaging may reveal pulmonary or cardiac involvement, and cervical spine imaging is important when neurologic symptoms or airway concerns are present.
Management Principles
Prehospital and emergency care priorities include airway management with cervical spine protection when indicated and treatment of acute complications. Nonsteroidal anti-inflammatory drugs and salicylates are first-line agents for symptom control in acute settings, recognizing that early disease may progress rapidly. Glucocorticoids, disease-modifying antirheumatic drugs, and biologic agents should generally be initiated or adjusted in consultation with a rheumatologist rather than started de novo in the emergency department. Pain control and supportive care are essential, while careful attention must be paid to medication side effects and comorbid conditions.
Disposition And Follow-Up
Hospital admission is warranted for patients with severe or life-threatening complications, unclear diagnoses where serious alternative conditions cannot be excluded, uncontrolled pain, significant functional impairment, or inadequate social support. Pediatric patients presenting with fever and arthritis require a low threshold for admission. Stable patients without complications may be discharged with appropriate outpatient management and close follow-up. Ongoing care should involve coordination with primary care and specialty services, including rheumatology, cardiology, ophthalmology, and orthopedics as indicated.
Clinical Insights And Diagnostic Pitfalls
Symmetric inflammatory arthritis strongly suggests rheumatoid arthritis, but the presence of this diagnosis does not exclude superimposed septic arthritis, which must always be considered. Disease-modifying therapies and biologic agents should not be initiated in the emergency department without specialist input. Careful evaluation for cervical spine instability and extra-articular complications is essential, as these may present with subtle but high-risk features.
Clinical Overview
Rheumatoid arthritis is a chronic, systemic inflammatory disease characterized by persistent, noninfectious synovitis that leads to progressive destruction of articular cartilage, joint deformity, and eventual ankylosis. The disease most commonly affects peripheral joints in a symmetric pattern and is associated with significant extra-articular involvement. Knee involvement is frequent, and chronic inflammation may result in Baker cyst formation. Axial disease is typically limited to the cervical spine, where atlantoaxial subluxation may occur and, rarely, cause spinal cord compression. Rheumatoid arthritis is distinct from juvenile idiopathic arthritis, which represents a separate pediatric condition.
Epidemiology And Pathogenesis
The etiology remains unknown, though autoimmune mechanisms likely triggered by environmental factors in genetically predisposed individuals are implicated. An association with HLA-DR4 has been identified. The condition affects approximately 1% of the global population, with a female predominance of roughly 3:1. Onset most commonly occurs between 30 and 50 years of age.
Clinical Manifestations
Early symptoms are often nonspecific and include fatigue, malaise, and diffuse musculoskeletal discomfort. Over weeks to months, patients develop warm, swollen, painful joints, classically worse in the morning with stiffness lasting longer than one hour. Joint involvement is usually symmetric and polyarticular, beginning in the small joints of the hands and feet and later involving the wrists, elbows, and knees. Distal interphalangeal joint involvement is uncommon and should prompt consideration of alternative diagnoses. Synovitis progresses gradually, and long-standing disease leads to characteristic deformities such as ulnar deviation of the metacarpophalangeal joints, swan-neck deformities, and boutonnière deformities.
Extra-articular manifestations are common and include subcutaneous rheumatoid nodules, vasculitis, pericarditis or myocarditis, pulmonary fibrosis or pneumonitis, Sjögren syndrome, and mononeuritis multiplex. Mild pericarditis may be present in a significant proportion of patients and may warrant electrocardiographic evaluation. Emergency department presentations often relate to disease flares or complications affecting other organ systems, including airway compromise from cricoarytenoid arthritis, cardiac conduction abnormalities, pulmonary disease, hepatic involvement, or neurologic deficits related to cervical spine instability. Ocular complications such as scleritis, episcleritis, iritis, or retinal vasculitis should be suspected in patients with red eye, photophobia, or vision changes and require urgent ophthalmologic evaluation. Chronic medication use may result in infections, osteopenia, fractures, metabolic disturbances, glaucoma, cataracts, or gastrointestinal bleeding.
Diagnostic Approach In The Emergency Setting
A definitive diagnosis of rheumatoid arthritis is rarely established in the emergency department. Diagnostic criteria require synovitis lasting at least six weeks and fulfillment of established classification criteria. Emergency evaluation should instead focus on excluding alternative or immediately life-threatening causes of arthritis, particularly septic arthritis, gout, or reactive arthritis. Arthrocentesis is indicated when infection or crystal-induced disease is a concern. A careful history should assess systemic symptoms such as weight loss, fever, weakness, bursitis, or tendonitis.
Laboratory And Imaging Evaluation
Laboratory studies may reveal mild anemia, leukocytosis, thrombocytosis, elevated erythrocyte sedimentation rate, and increased C-reactive protein, which correlates with erosive disease. Rheumatoid factor is positive in the majority of patients, while antinuclear antibodies may be present in a subset. Synovial fluid analysis typically shows an inflammatory profile with elevated white blood cell counts and neutrophil predominance, without organisms or crystals. Imaging may demonstrate joint effusions, juxta-articular erosions, joint space narrowing, and loss of cartilage. MRI can detect early inflammatory changes before radiographic abnormalities. Chest imaging may reveal pulmonary or cardiac involvement, and cervical spine imaging is important when neurologic symptoms or airway concerns are present.
Management Principles
Prehospital and emergency care priorities include airway management with cervical spine protection when indicated and treatment of acute complications. Nonsteroidal anti-inflammatory drugs and salicylates are first-line agents for symptom control in acute settings, recognizing that early disease may progress rapidly. Glucocorticoids, disease-modifying antirheumatic drugs, and biologic agents should generally be initiated or adjusted in consultation with a rheumatologist rather than started de novo in the emergency department. Pain control and supportive care are essential, while careful attention must be paid to medication side effects and comorbid conditions.
Disposition And Follow-Up
Hospital admission is warranted for patients with severe or life-threatening complications, unclear diagnoses where serious alternative conditions cannot be excluded, uncontrolled pain, significant functional impairment, or inadequate social support. Pediatric patients presenting with fever and arthritis require a low threshold for admission. Stable patients without complications may be discharged with appropriate outpatient management and close follow-up. Ongoing care should involve coordination with primary care and specialty services, including rheumatology, cardiology, ophthalmology, and orthopedics as indicated.
Clinical Insights And Diagnostic Pitfalls
Symmetric inflammatory arthritis strongly suggests rheumatoid arthritis, but the presence of this diagnosis does not exclude superimposed septic arthritis, which must always be considered. Disease-modifying therapies and biologic agents should not be initiated in the emergency department without specialist input. Careful evaluation for cervical spine instability and extra-articular complications is essential, as these may present with subtle but high-risk features.
- Published on
Emergency and Acute Medicine – Degenerative Arthritis (Osteoarthritis)
Overview And Disease Background
Degenerative arthritis, commonly known as osteoarthritis, is the most prevalent progressive joint disorder and a leading cause of chronic musculoskeletal pain in older adults. It primarily affects weight-bearing and frequently used joints and represents a gradual failure of joint cartilage with secondary changes in surrounding bone and soft tissue. Although most cases occur in the elderly, younger patients may be affected following significant joint trauma.
Pathogenesis And Risk Factors
Osteoarthritis develops from cumulative mechanical stress on synovial joints over time, leading to progressive breakdown of articular cartilage. This degeneration triggers reactive bone formation at joint margins and subchondral sclerosis, resulting in reduced joint cushioning and altered biomechanics. Contributing risk factors include advancing age, obesity, prior joint injury, genetic predisposition, sex-related differences, and environmental or occupational joint loading.
Clinical Features And Symptom Pattern
Patients typically report chronic, gradually worsening joint pain that is exacerbated by activity or weight bearing and relieved with rest. Joint involvement is often asymmetric and commonly affects the knees, hips, hands, feet, and spine. Morning stiffness is brief, usually lasting less than 30 minutes, distinguishing osteoarthritis from inflammatory arthritides. As disease progresses, joint deformity and restricted range of motion become evident. Bony enlargements such as Heberden nodes at the distal interphalangeal joints and Bouchard nodes at the proximal interphalangeal joints are characteristic findings. Systemic symptoms are notably absent, and crepitus with movement is common.
Evaluation And Initial Assessment
Assessment begins with a detailed joint examination focusing on pain localization, range of motion, stability, and functional limitation. Plain radiographs are the primary imaging modality and typically demonstrate joint space narrowing, marginal osteophyte formation, subchondral sclerosis, and irregular joint contours. In the presence of joint effusion, synovial fluid analysis may be both diagnostic and therapeutic. Arthrocentesis is mandatory when warmth, erythema, or significant swelling raises concern for septic arthritis or crystalline disease. In such cases, inflammatory markers and blood counts may assist in excluding infection.
Diagnostic Findings
Synovial fluid analysis in osteoarthritis usually reveals clear fluid with mildly elevated leukocyte counts below inflammatory thresholds, a low proportion of polymorphonuclear cells, and glucose levels comparable to serum. Radiographic findings remain the cornerstone of diagnosis and correlate with structural disease, though symptom severity may not always align with imaging changes.
Differential Diagnostic Considerations
Conditions that may mimic or coexist with degenerative arthritis include gout or pseudogout, septic arthritis, rheumatoid arthritis, hemarthrosis, Charcot arthropathy, and periarticular soft tissue disorders such as bursitis or cellulitis. Careful clinical correlation is essential to avoid missed diagnoses.
Management Principles In The Emergency Setting
Treatment is individualized and directed toward symptom relief rather than radiographic severity. Acute management focuses on pain control and preservation of joint function. Temporary immobilization may be appropriate until fracture is excluded, but prolonged immobilization should be avoided. Patients should be encouraged to maintain gentle joint movement and begin strengthening exercises once pain is controlled.
Procedural And Pharmacologic Therapy
Ultrasound-guided arthrocentesis and intra-articular corticosteroid injection can provide effective symptom relief in selected patients, with or without joint effusion. Strict aseptic technique is essential, and corticosteroids must not be administered if septic arthritis cannot be confidently excluded. Medication therapy typically begins with acetaminophen due to its favorable safety profile. Nonsteroidal anti-inflammatory drugs may be added if pain persists, with careful attention to gastrointestinal and cardiovascular risk factors. Adjunctive options such as glucosamine and chondroitin may offer modest benefit in some patients. Lifestyle interventions, particularly weight reduction and muscle strengthening, play a central role in long-term disease control.
Disposition And Follow-Up Planning
Hospital admission is rarely required unless fracture, infection, or severe functional limitation is present. Most patients can be safely discharged once pain is controlled and ambulation is adequate. Follow-up with primary care, sports medicine, or orthopedics is recommended for ongoing management, rehabilitation planning, and consideration of advanced therapies if symptoms progress.
Overview And Disease Background
Degenerative arthritis, commonly known as osteoarthritis, is the most prevalent progressive joint disorder and a leading cause of chronic musculoskeletal pain in older adults. It primarily affects weight-bearing and frequently used joints and represents a gradual failure of joint cartilage with secondary changes in surrounding bone and soft tissue. Although most cases occur in the elderly, younger patients may be affected following significant joint trauma.
Pathogenesis And Risk Factors
Osteoarthritis develops from cumulative mechanical stress on synovial joints over time, leading to progressive breakdown of articular cartilage. This degeneration triggers reactive bone formation at joint margins and subchondral sclerosis, resulting in reduced joint cushioning and altered biomechanics. Contributing risk factors include advancing age, obesity, prior joint injury, genetic predisposition, sex-related differences, and environmental or occupational joint loading.
Clinical Features And Symptom Pattern
Patients typically report chronic, gradually worsening joint pain that is exacerbated by activity or weight bearing and relieved with rest. Joint involvement is often asymmetric and commonly affects the knees, hips, hands, feet, and spine. Morning stiffness is brief, usually lasting less than 30 minutes, distinguishing osteoarthritis from inflammatory arthritides. As disease progresses, joint deformity and restricted range of motion become evident. Bony enlargements such as Heberden nodes at the distal interphalangeal joints and Bouchard nodes at the proximal interphalangeal joints are characteristic findings. Systemic symptoms are notably absent, and crepitus with movement is common.
Evaluation And Initial Assessment
Assessment begins with a detailed joint examination focusing on pain localization, range of motion, stability, and functional limitation. Plain radiographs are the primary imaging modality and typically demonstrate joint space narrowing, marginal osteophyte formation, subchondral sclerosis, and irregular joint contours. In the presence of joint effusion, synovial fluid analysis may be both diagnostic and therapeutic. Arthrocentesis is mandatory when warmth, erythema, or significant swelling raises concern for septic arthritis or crystalline disease. In such cases, inflammatory markers and blood counts may assist in excluding infection.
Diagnostic Findings
Synovial fluid analysis in osteoarthritis usually reveals clear fluid with mildly elevated leukocyte counts below inflammatory thresholds, a low proportion of polymorphonuclear cells, and glucose levels comparable to serum. Radiographic findings remain the cornerstone of diagnosis and correlate with structural disease, though symptom severity may not always align with imaging changes.
Differential Diagnostic Considerations
Conditions that may mimic or coexist with degenerative arthritis include gout or pseudogout, septic arthritis, rheumatoid arthritis, hemarthrosis, Charcot arthropathy, and periarticular soft tissue disorders such as bursitis or cellulitis. Careful clinical correlation is essential to avoid missed diagnoses.
Management Principles In The Emergency Setting
Treatment is individualized and directed toward symptom relief rather than radiographic severity. Acute management focuses on pain control and preservation of joint function. Temporary immobilization may be appropriate until fracture is excluded, but prolonged immobilization should be avoided. Patients should be encouraged to maintain gentle joint movement and begin strengthening exercises once pain is controlled.
Procedural And Pharmacologic Therapy
Ultrasound-guided arthrocentesis and intra-articular corticosteroid injection can provide effective symptom relief in selected patients, with or without joint effusion. Strict aseptic technique is essential, and corticosteroids must not be administered if septic arthritis cannot be confidently excluded. Medication therapy typically begins with acetaminophen due to its favorable safety profile. Nonsteroidal anti-inflammatory drugs may be added if pain persists, with careful attention to gastrointestinal and cardiovascular risk factors. Adjunctive options such as glucosamine and chondroitin may offer modest benefit in some patients. Lifestyle interventions, particularly weight reduction and muscle strengthening, play a central role in long-term disease control.
Disposition And Follow-Up Planning
Hospital admission is rarely required unless fracture, infection, or severe functional limitation is present. Most patients can be safely discharged once pain is controlled and ambulation is adequate. Follow-up with primary care, sports medicine, or orthopedics is recommended for ongoing management, rehabilitation planning, and consideration of advanced therapies if symptoms progress.
- Published on
Emergency and Acute Medicine – Acute Arterial Occlusion
Overview And Core Concepts
Acute arterial occlusion represents a sudden and critical interruption of blood flow to an extremity, placing limb viability at immediate risk. This condition most commonly results from embolic obstruction, in situ thrombosis, arterial dissection, or traumatic vascular injury. Without prompt restoration of perfusion, irreversible ischemic damage typically develops within six hours, leading to functional impairment or limb loss. In patients with chronic arterial disease, preexisting collateral circulation may delay tissue necrosis beyond this window.
Pathophysiology And Mechanisms
Embolic occlusion usually arises from thrombus or atherosclerotic debris originating in the heart or proximal arteries, frequently lodging at sites of abrupt arterial narrowing. Thrombosis often occurs on a background of atherosclerosis, vascular grafts, aneurysms, or hypercoagulable states. Traumatic causes include penetrating or blunt injury resulting in intimal disruption, dissection, transection, or compressive vascular damage. Iatrogenic injury may follow catheterization or endovascular procedures. The resulting ischemia leads to progressive nerve and muscle dysfunction as metabolic waste accumulates and oxygen delivery ceases.
Clinical Presentation
Patients classically present with the abrupt onset of severe limb pain accompanied by coldness and pallor. The hallmark features are described by the “six Ps”: pain, pallor, paresthesias, paralysis, pulselessness, and poikilothermia. Sensory disturbances typically precede motor weakness, beginning distally and progressing proximally. In embolic events, symptoms are sudden and dramatic, whereas thrombotic occlusion may evolve more gradually. Advanced ischemia is suggested by absent capillary refill, skin mottling, cyanosis, and profound neurologic deficits, all of which indicate a poor prognosis. A subset of patients may develop painful blue or violaceous discoloration of the toes, known as blue toe syndrome.
History And Physical Examination
Accurate determination of symptom onset is essential, as ischemic duration strongly predicts outcome. A history of claudication, atrial fibrillation, recent myocardial infarction, valvular disease, vascular interventions, or trauma should be sought. Examination focuses on documenting sensory loss, muscle strength, skin temperature and color, and pulse deficits. Signs of chronic arterial insufficiency, such as hair loss and atrophic skin, may indicate underlying peripheral vascular disease. Measurement of the ankle–brachial index is helpful, with values below 0.5 strongly suggesting acute occlusion.
Diagnostic Strategy
Acute arterial occlusion is primarily a clinical diagnosis, and management decisions should not be delayed for extensive testing. Laboratory studies assess metabolic derangements and muscle injury, including electrolytes, renal function, complete blood count, and creatine phosphokinase. Duplex ultrasonography may assist in localizing arterial obstruction, while CT angiography or MR angiography can provide detailed vascular mapping when time and patient stability permit. Angiography remains useful for definitive classification and planning intervention but is often performed in conjunction with treatment.
Severity Classification
Limbs are categorized as viable, threatened, or nonviable based on neurologic findings, capillary refill, and Doppler signals. Viable limbs have pain without sensory or motor loss and require urgent but not immediate intervention. Threatened limbs show sensory deficits with or without weakness and mandate prompt revascularization. Nonviable limbs exhibit paralysis, profound sensory loss, absent capillary flow, and skin marbling, indicating irreversible ischemia and the need for amputation.
Management In The Emergency Setting
Initial care prioritizes rapid recognition, vascular surgery consultation, and anticoagulation. The affected limb should be kept dependent and protected from temperature extremes; elevation or application of heat or ice is contraindicated. Systemic anticoagulation with intravenous unfractionated heparin should be initiated promptly unless contraindicated. Analgesia and supplemental oxygen are provided as needed. Definitive treatment depends on limb viability and includes surgical embolectomy, thrombolysis, endovascular repair, or bypass. Nonviable limbs require urgent amputation to prevent systemic complications.
Disposition And Follow-Up
All patients with suspected acute arterial occlusion require hospital admission following emergent vascular consultation. Patients with chronic occlusive disease who have stable symptoms and preserved perfusion may be discharged with close outpatient vascular follow-up, provided no acute precipitating factors are identified and clear return precautions are given.
Clinical Insights And Common Pitfalls
Acute arterial occlusion is a limb-threatening emergency in which time to reperfusion is critical. Absence of pain does not exclude severe ischemia, as sensory loss may reflect advanced nerve injury. Normal skin color early in the course can be misleading, and pulselessness is often a late finding. Limb elevation or thermal manipulation can worsen ischemia and should be avoided. Early anticoagulation and rapid surgical involvement are essential to maximize limb salvage and patient outcomes.
Overview And Core Concepts
Acute arterial occlusion represents a sudden and critical interruption of blood flow to an extremity, placing limb viability at immediate risk. This condition most commonly results from embolic obstruction, in situ thrombosis, arterial dissection, or traumatic vascular injury. Without prompt restoration of perfusion, irreversible ischemic damage typically develops within six hours, leading to functional impairment or limb loss. In patients with chronic arterial disease, preexisting collateral circulation may delay tissue necrosis beyond this window.
Pathophysiology And Mechanisms
Embolic occlusion usually arises from thrombus or atherosclerotic debris originating in the heart or proximal arteries, frequently lodging at sites of abrupt arterial narrowing. Thrombosis often occurs on a background of atherosclerosis, vascular grafts, aneurysms, or hypercoagulable states. Traumatic causes include penetrating or blunt injury resulting in intimal disruption, dissection, transection, or compressive vascular damage. Iatrogenic injury may follow catheterization or endovascular procedures. The resulting ischemia leads to progressive nerve and muscle dysfunction as metabolic waste accumulates and oxygen delivery ceases.
Clinical Presentation
Patients classically present with the abrupt onset of severe limb pain accompanied by coldness and pallor. The hallmark features are described by the “six Ps”: pain, pallor, paresthesias, paralysis, pulselessness, and poikilothermia. Sensory disturbances typically precede motor weakness, beginning distally and progressing proximally. In embolic events, symptoms are sudden and dramatic, whereas thrombotic occlusion may evolve more gradually. Advanced ischemia is suggested by absent capillary refill, skin mottling, cyanosis, and profound neurologic deficits, all of which indicate a poor prognosis. A subset of patients may develop painful blue or violaceous discoloration of the toes, known as blue toe syndrome.
History And Physical Examination
Accurate determination of symptom onset is essential, as ischemic duration strongly predicts outcome. A history of claudication, atrial fibrillation, recent myocardial infarction, valvular disease, vascular interventions, or trauma should be sought. Examination focuses on documenting sensory loss, muscle strength, skin temperature and color, and pulse deficits. Signs of chronic arterial insufficiency, such as hair loss and atrophic skin, may indicate underlying peripheral vascular disease. Measurement of the ankle–brachial index is helpful, with values below 0.5 strongly suggesting acute occlusion.
Diagnostic Strategy
Acute arterial occlusion is primarily a clinical diagnosis, and management decisions should not be delayed for extensive testing. Laboratory studies assess metabolic derangements and muscle injury, including electrolytes, renal function, complete blood count, and creatine phosphokinase. Duplex ultrasonography may assist in localizing arterial obstruction, while CT angiography or MR angiography can provide detailed vascular mapping when time and patient stability permit. Angiography remains useful for definitive classification and planning intervention but is often performed in conjunction with treatment.
Severity Classification
Limbs are categorized as viable, threatened, or nonviable based on neurologic findings, capillary refill, and Doppler signals. Viable limbs have pain without sensory or motor loss and require urgent but not immediate intervention. Threatened limbs show sensory deficits with or without weakness and mandate prompt revascularization. Nonviable limbs exhibit paralysis, profound sensory loss, absent capillary flow, and skin marbling, indicating irreversible ischemia and the need for amputation.
Management In The Emergency Setting
Initial care prioritizes rapid recognition, vascular surgery consultation, and anticoagulation. The affected limb should be kept dependent and protected from temperature extremes; elevation or application of heat or ice is contraindicated. Systemic anticoagulation with intravenous unfractionated heparin should be initiated promptly unless contraindicated. Analgesia and supplemental oxygen are provided as needed. Definitive treatment depends on limb viability and includes surgical embolectomy, thrombolysis, endovascular repair, or bypass. Nonviable limbs require urgent amputation to prevent systemic complications.
Disposition And Follow-Up
All patients with suspected acute arterial occlusion require hospital admission following emergent vascular consultation. Patients with chronic occlusive disease who have stable symptoms and preserved perfusion may be discharged with close outpatient vascular follow-up, provided no acute precipitating factors are identified and clear return precautions are given.
Clinical Insights And Common Pitfalls
Acute arterial occlusion is a limb-threatening emergency in which time to reperfusion is critical. Absence of pain does not exclude severe ischemia, as sensory loss may reflect advanced nerve injury. Normal skin color early in the course can be misleading, and pulselessness is often a late finding. Limb elevation or thermal manipulation can worsen ischemia and should be avoided. Early anticoagulation and rapid surgical involvement are essential to maximize limb salvage and patient outcomes.
- Published on
Emergency and Acute Medicine – Acute Appendicitis
Overview And Definition
Acute appendicitis is the most common surgical abdominal emergency encountered in emergency medicine. It results from acute obstruction of the appendiceal lumen, leading to progressive distension, ischemia, bacterial overgrowth, and eventual perforation if untreated. Pain classically begins in the periumbilical region due to visceral afferent stimulation and later localizes to the right lower quadrant as inflammation involves the parietal peritoneum.
Epidemiology And Special Populations
Children frequently present atypically, with high misdiagnosis rates, especially under 12 years of age, and nearly universal diagnostic difficulty in those under 2 years. Younger children have markedly increased perforation rates, strongly linked to delayed recognition. Older adults often exhibit blunted inflammatory responses and atypical presentations, resulting in higher rates of perforation at diagnosis. In pregnancy, appendicitis occurs most commonly in the second trimester, but perforation risk is greatest in the third trimester. Despite anatomic displacement of the appendix, right lower quadrant pain remains the predominant symptom, and fetal loss increases substantially with perforation.
Pathophysiology And Cause
Luminal obstruction, most commonly from lymphoid hyperplasia or fecaliths, initiates appendiceal distension and venous congestion. Progressive edema compromises arterial flow, allowing bacterial invasion of the wall. Without intervention, perforation typically occurs within 24 to 36 hours and may result in diffuse peritonitis or localized abscess formation. Gram-negative organisms and anaerobes predominate.
Clinical Presentation
Abdominal pain is the hallmark symptom, most often localized to the right lower quadrant, though location varies with appendiceal anatomy. Retrocecal appendicitis may cause flank, back, or testicular pain, while a pelvic appendix may produce suprapubic discomfort or urinary and rectal symptoms. Anorexia is common and often precedes nausea and vomiting. Bowel habit changes, including diarrhea or constipation, may occur. Pediatric patients frequently have vague symptoms, and observation for subtle signs such as reluctance to move, limping, or hip flexion is essential.
Physical Examination
Vital signs may be normal early, with fever typically mild until perforation develops. Localized tenderness at McBurney’s point is common. Guarding may be voluntary early and becomes involuntary as inflammation progresses. Rebound tenderness reflects peritoneal irritation. Provocative signs such as Rovsing, psoas, and obturator maneuvers may aid diagnosis but are less reliable, particularly in children. Rectal examination has limited diagnostic value, while pelvic examination is critical in women to exclude gynecologic pathology.
Diagnostic Approach
A classic history and examination are often sufficient to justify surgical consultation without imaging. In atypical cases, serial examinations combined with selective laboratory and imaging studies reduce unnecessary surgery without increasing perforation risk.
Laboratory And Imaging Evaluation
Leukocytosis with a left shift is common but not universal, and normal values do not exclude appendicitis. C-reactive protein may be helpful, particularly when trended. Urinalysis is usually normal but may show mild abnormalities when the appendix lies near the urinary tract. Ultrasound is preferred in children and pregnancy and demonstrates a noncompressible, enlarged appendix. CT scanning provides the highest diagnostic accuracy and is valuable for identifying complications or alternative diagnoses. MRI offers excellent sensitivity without ionizing radiation and is useful when CT is undesirable.
Differential Diagnosis
Conditions that may mimic appendicitis include gastroenteritis, mesenteric adenitis, Meckel diverticulum, inflammatory bowel disease, diverticulitis, urinary tract infection, gynecologic emergencies, renal colic, testicular torsion, diabetic ketoacidosis, and systemic infections, particularly in pediatric patients.
Emergency Management
Initial management prioritizes airway, breathing, and circulation, with intravenous fluid resuscitation as needed. Patients with strong clinical suspicion require immediate surgical consultation. Adequate analgesia, including opioids, should not be withheld, as it does not obscure diagnostic accuracy. Broad-spectrum antibiotics are administered perioperatively. Selected patients with appendiceal abscess may be managed nonoperatively with antibiotics and drainage, followed by interval appendectomy. Observation with repeat evaluation is appropriate when the diagnosis remains uncertain.
Disposition And Follow-Up
Confirmed appendicitis requires admission for surgical management. Patients with resolving symptoms and low suspicion for appendicitis may be discharged with strict return precautions and reevaluation within 24 to 48 hours.
Clinical Pearls And Pitfalls
Children and older adults often present atypically and have higher perforation rates. Imaging is unnecessary in classic presentations with convincing clinical findings. Appendicitis cannot be definitively excluded solely because the appendix is not visualized on imaging; ongoing clinical reassessment remains essential.
Overview And Definition
Acute appendicitis is the most common surgical abdominal emergency encountered in emergency medicine. It results from acute obstruction of the appendiceal lumen, leading to progressive distension, ischemia, bacterial overgrowth, and eventual perforation if untreated. Pain classically begins in the periumbilical region due to visceral afferent stimulation and later localizes to the right lower quadrant as inflammation involves the parietal peritoneum.
Epidemiology And Special Populations
Children frequently present atypically, with high misdiagnosis rates, especially under 12 years of age, and nearly universal diagnostic difficulty in those under 2 years. Younger children have markedly increased perforation rates, strongly linked to delayed recognition. Older adults often exhibit blunted inflammatory responses and atypical presentations, resulting in higher rates of perforation at diagnosis. In pregnancy, appendicitis occurs most commonly in the second trimester, but perforation risk is greatest in the third trimester. Despite anatomic displacement of the appendix, right lower quadrant pain remains the predominant symptom, and fetal loss increases substantially with perforation.
Pathophysiology And Cause
Luminal obstruction, most commonly from lymphoid hyperplasia or fecaliths, initiates appendiceal distension and venous congestion. Progressive edema compromises arterial flow, allowing bacterial invasion of the wall. Without intervention, perforation typically occurs within 24 to 36 hours and may result in diffuse peritonitis or localized abscess formation. Gram-negative organisms and anaerobes predominate.
Clinical Presentation
Abdominal pain is the hallmark symptom, most often localized to the right lower quadrant, though location varies with appendiceal anatomy. Retrocecal appendicitis may cause flank, back, or testicular pain, while a pelvic appendix may produce suprapubic discomfort or urinary and rectal symptoms. Anorexia is common and often precedes nausea and vomiting. Bowel habit changes, including diarrhea or constipation, may occur. Pediatric patients frequently have vague symptoms, and observation for subtle signs such as reluctance to move, limping, or hip flexion is essential.
Physical Examination
Vital signs may be normal early, with fever typically mild until perforation develops. Localized tenderness at McBurney’s point is common. Guarding may be voluntary early and becomes involuntary as inflammation progresses. Rebound tenderness reflects peritoneal irritation. Provocative signs such as Rovsing, psoas, and obturator maneuvers may aid diagnosis but are less reliable, particularly in children. Rectal examination has limited diagnostic value, while pelvic examination is critical in women to exclude gynecologic pathology.
Diagnostic Approach
A classic history and examination are often sufficient to justify surgical consultation without imaging. In atypical cases, serial examinations combined with selective laboratory and imaging studies reduce unnecessary surgery without increasing perforation risk.
Laboratory And Imaging Evaluation
Leukocytosis with a left shift is common but not universal, and normal values do not exclude appendicitis. C-reactive protein may be helpful, particularly when trended. Urinalysis is usually normal but may show mild abnormalities when the appendix lies near the urinary tract. Ultrasound is preferred in children and pregnancy and demonstrates a noncompressible, enlarged appendix. CT scanning provides the highest diagnostic accuracy and is valuable for identifying complications or alternative diagnoses. MRI offers excellent sensitivity without ionizing radiation and is useful when CT is undesirable.
Differential Diagnosis
Conditions that may mimic appendicitis include gastroenteritis, mesenteric adenitis, Meckel diverticulum, inflammatory bowel disease, diverticulitis, urinary tract infection, gynecologic emergencies, renal colic, testicular torsion, diabetic ketoacidosis, and systemic infections, particularly in pediatric patients.
Emergency Management
Initial management prioritizes airway, breathing, and circulation, with intravenous fluid resuscitation as needed. Patients with strong clinical suspicion require immediate surgical consultation. Adequate analgesia, including opioids, should not be withheld, as it does not obscure diagnostic accuracy. Broad-spectrum antibiotics are administered perioperatively. Selected patients with appendiceal abscess may be managed nonoperatively with antibiotics and drainage, followed by interval appendectomy. Observation with repeat evaluation is appropriate when the diagnosis remains uncertain.
Disposition And Follow-Up
Confirmed appendicitis requires admission for surgical management. Patients with resolving symptoms and low suspicion for appendicitis may be discharged with strict return precautions and reevaluation within 24 to 48 hours.
Clinical Pearls And Pitfalls
Children and older adults often present atypically and have higher perforation rates. Imaging is unnecessary in classic presentations with convincing clinical findings. Appendicitis cannot be definitively excluded solely because the appendix is not visualized on imaging; ongoing clinical reassessment remains essential.
