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Emergency And Acute Medicine – Diabetes Insipidus
Overview And Definition
Diabetes insipidus is a disorder characterized by excretion of abnormally large volumes of dilute urine due to impaired action of arginine vasopressin. Polyuria is typically defined as urine output exceeding 3 liters in 24 hours and is often accompanied by excessive thirst and fluid intake. Two major forms exist: central diabetes insipidus, caused by deficient synthesis or release of vasopressin, and nephrogenic diabetes insipidus, caused by renal resistance to vasopressin. Familial cases occur in both forms, with some nephrogenic cases inherited in an X-linked recessive pattern.
Causes And Risk Factors
Central diabetes insipidus results from disruption of the hypothalamic–pituitary axis and is most common between 10 and 20 years of age. Causes include head trauma, neurosurgery, pituitary or hypothalamic tumors such as craniopharyngioma or germinoma, metastatic disease, granulomatous disorders, congenital CNS anomalies, CNS infections, pregnancy-related pituitary injury, idiopathic autoimmune processes, Wolfram syndrome, and ethanol use. Nephrogenic diabetes insipidus arises from intrinsic renal pathology or impaired tubular response to vasopressin and may be due to congenital renal disorders, obstructive uropathy, polycystic kidney disease, systemic diseases such as sickle cell disease or amyloidosis, medications such as lithium, amphotericin, aminoglycosides, and demeclocycline, or electrolyte disturbances including hypercalcemia and hypokalemia.
Pregnancy-Related Considerations
Transient diabetes insipidus may occur during the second trimester due to increased circulating vasopressinase, leading to reduced vasopressin activity. Symptoms usually resolve within weeks after delivery. Desmopressin is effective because it is resistant to vasopressinase. Sheehan syndrome is another pregnancy-related cause of central diabetes insipidus.
Clinical Features And Presentation
Patients commonly report marked polyuria, sometimes producing 16–24 liters of urine daily, along with intense polydipsia, often preferring cold fluids. Additional features may include medication exposure or symptoms suggestive of hypothalamic or pituitary tumors such as headache, visual changes, growth abnormalities, obesity, temperature dysregulation, sleep disturbance, or behavioral changes. Physical examination may reveal dehydration, cachexia, head trauma signs, visual field deficits, or seizures.
Pediatric Presentation
In children, polyuria and polydipsia may go unrecognized until dehydration develops. Neonates may present at birth and are at risk for severe hypernatremia and permanent neurologic injury if untreated. Infants may show irritability, poor feeding, weight loss, constipation, growth failure, recurrent fever, or abnormal behavior. Older children may present with enuresis or difficulty with toilet training.
Essential Emergency Evaluation
In the emergency setting, the diagnosis is largely clinical, supported by hypernatremia with copious dilute urine output. A careful history of fluid intake, voiding frequency, medication use, and physical findings is essential.
Diagnostic Studies And Interpretation
Urinalysis typically shows low specific gravity. Serum and urine osmolality reveal elevated serum osmolality with inappropriately low urine osmolality. Electrolyte testing may demonstrate hypernatremia, hypercalcemia, or hypokalemia. Renal function tests and glucose help exclude other causes of polyuria. Serum and urine vasopressin levels are not required in the emergency department. Imaging such as CT or chest radiography may be indicated for trauma or malignancy evaluation, while MRI of the pituitary axis is usually performed outpatient. Water deprivation testing is not recommended in the emergency setting because of safety concerns, especially in hypotensive patients and children.
Differential Diagnosis
Alternative considerations include inadequate access to free water, excessive insensible losses, primary sodium excess, psychogenic polydipsia, diuretic use, osmotic diuresis, resolving acute renal failure, and uncontrolled diabetes mellitus.
Initial And Emergency Management
Initial care focuses on airway, breathing, and circulation, with attention to possible head trauma. Hypotension should be treated with isotonic saline. Because intravascular volume represents a small fraction of total water deficit, careful correction is required. Central diabetes insipidus is treated with desmopressin, administered intranasally, orally, intravenously, or subcutaneously in divided doses. Caution is required in postoperative patients due to risk of cerebral edema. Nephrogenic diabetes insipidus is managed by treating the underlying cause, discontinuing offending medications, correcting electrolyte abnormalities, implementing dietary sodium restriction, and using thiazide diuretics, often with amiloride. NSAIDs such as indomethacin may reduce urine output. Parenteral free-water replacement is reserved for symptomatic hypernatremia when oral intake is not possible.
Medication Therapy
Common agents include desmopressin in various formulations, thiazide diuretics, amiloride, and in selected cases chlorpropamide or clofibrate for partial central disease. Aqueous vasopressin has limited use due to short half-life and adverse effects.
Disposition And Follow-Up
Admission is indicated for altered mental status, seizures, severe dehydration, significant electrolyte abnormalities, associated trauma, or need for diagnostic testing under observation. Patients with a known diagnosis, stable electrolytes, and adequate hydration may be discharged with close follow-up. Referral to endocrinology or nephrology depends on the underlying etiology.
Key Clinical Insights And Pitfalls
Always consider diabetes insipidus in patients with unexplained polyuria and low urine osmolality. Central diabetes insipidus typically responds to desmopressin, whereas nephrogenic diabetes insipidus does not and requires management of renal resistance and contributing factors.
Overview And Definition
Diabetes insipidus is a disorder characterized by excretion of abnormally large volumes of dilute urine due to impaired action of arginine vasopressin. Polyuria is typically defined as urine output exceeding 3 liters in 24 hours and is often accompanied by excessive thirst and fluid intake. Two major forms exist: central diabetes insipidus, caused by deficient synthesis or release of vasopressin, and nephrogenic diabetes insipidus, caused by renal resistance to vasopressin. Familial cases occur in both forms, with some nephrogenic cases inherited in an X-linked recessive pattern.
Causes And Risk Factors
Central diabetes insipidus results from disruption of the hypothalamic–pituitary axis and is most common between 10 and 20 years of age. Causes include head trauma, neurosurgery, pituitary or hypothalamic tumors such as craniopharyngioma or germinoma, metastatic disease, granulomatous disorders, congenital CNS anomalies, CNS infections, pregnancy-related pituitary injury, idiopathic autoimmune processes, Wolfram syndrome, and ethanol use. Nephrogenic diabetes insipidus arises from intrinsic renal pathology or impaired tubular response to vasopressin and may be due to congenital renal disorders, obstructive uropathy, polycystic kidney disease, systemic diseases such as sickle cell disease or amyloidosis, medications such as lithium, amphotericin, aminoglycosides, and demeclocycline, or electrolyte disturbances including hypercalcemia and hypokalemia.
Pregnancy-Related Considerations
Transient diabetes insipidus may occur during the second trimester due to increased circulating vasopressinase, leading to reduced vasopressin activity. Symptoms usually resolve within weeks after delivery. Desmopressin is effective because it is resistant to vasopressinase. Sheehan syndrome is another pregnancy-related cause of central diabetes insipidus.
Clinical Features And Presentation
Patients commonly report marked polyuria, sometimes producing 16–24 liters of urine daily, along with intense polydipsia, often preferring cold fluids. Additional features may include medication exposure or symptoms suggestive of hypothalamic or pituitary tumors such as headache, visual changes, growth abnormalities, obesity, temperature dysregulation, sleep disturbance, or behavioral changes. Physical examination may reveal dehydration, cachexia, head trauma signs, visual field deficits, or seizures.
Pediatric Presentation
In children, polyuria and polydipsia may go unrecognized until dehydration develops. Neonates may present at birth and are at risk for severe hypernatremia and permanent neurologic injury if untreated. Infants may show irritability, poor feeding, weight loss, constipation, growth failure, recurrent fever, or abnormal behavior. Older children may present with enuresis or difficulty with toilet training.
Essential Emergency Evaluation
In the emergency setting, the diagnosis is largely clinical, supported by hypernatremia with copious dilute urine output. A careful history of fluid intake, voiding frequency, medication use, and physical findings is essential.
Diagnostic Studies And Interpretation
Urinalysis typically shows low specific gravity. Serum and urine osmolality reveal elevated serum osmolality with inappropriately low urine osmolality. Electrolyte testing may demonstrate hypernatremia, hypercalcemia, or hypokalemia. Renal function tests and glucose help exclude other causes of polyuria. Serum and urine vasopressin levels are not required in the emergency department. Imaging such as CT or chest radiography may be indicated for trauma or malignancy evaluation, while MRI of the pituitary axis is usually performed outpatient. Water deprivation testing is not recommended in the emergency setting because of safety concerns, especially in hypotensive patients and children.
Differential Diagnosis
Alternative considerations include inadequate access to free water, excessive insensible losses, primary sodium excess, psychogenic polydipsia, diuretic use, osmotic diuresis, resolving acute renal failure, and uncontrolled diabetes mellitus.
Initial And Emergency Management
Initial care focuses on airway, breathing, and circulation, with attention to possible head trauma. Hypotension should be treated with isotonic saline. Because intravascular volume represents a small fraction of total water deficit, careful correction is required. Central diabetes insipidus is treated with desmopressin, administered intranasally, orally, intravenously, or subcutaneously in divided doses. Caution is required in postoperative patients due to risk of cerebral edema. Nephrogenic diabetes insipidus is managed by treating the underlying cause, discontinuing offending medications, correcting electrolyte abnormalities, implementing dietary sodium restriction, and using thiazide diuretics, often with amiloride. NSAIDs such as indomethacin may reduce urine output. Parenteral free-water replacement is reserved for symptomatic hypernatremia when oral intake is not possible.
Medication Therapy
Common agents include desmopressin in various formulations, thiazide diuretics, amiloride, and in selected cases chlorpropamide or clofibrate for partial central disease. Aqueous vasopressin has limited use due to short half-life and adverse effects.
Disposition And Follow-Up
Admission is indicated for altered mental status, seizures, severe dehydration, significant electrolyte abnormalities, associated trauma, or need for diagnostic testing under observation. Patients with a known diagnosis, stable electrolytes, and adequate hydration may be discharged with close follow-up. Referral to endocrinology or nephrology depends on the underlying etiology.
Key Clinical Insights And Pitfalls
Always consider diabetes insipidus in patients with unexplained polyuria and low urine osmolality. Central diabetes insipidus typically responds to desmopressin, whereas nephrogenic diabetes insipidus does not and requires management of renal resistance and contributing factors.
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Emergency and Acute Medicine - Dialysis Complications
Basics
Description Dialysis complications may be vascular access related, nonvascular access related, or peritoneal. Vascular access complications include infection and bleeding. Nonvascular complications include hypotension and electrolyte disturbances such as hyperkalemia. Peritoneal complications most commonly involve abdominal pain and infection.
Etiology
Vascular access related complications include infections, which are a major cause of morbidity and mortality in dialysis patients and are most often caused by Staphylococcus aureus. These infections may present with localized signs, systemic sepsis, or minimal findings. Thrombosis or stenosis of access sites often presents with loss of bruit or thrill and requires urgent intervention to prevent access loss. Bleeding from access sites can be life-threatening and may be associated with aneurysm formation.
Nonvascular access related complications include hypotension, the most common complication of hemodialysis. This may occur during or after dialysis due to acute intravascular volume depletion, myocardial ischemia, sepsis, dysrhythmias, hypoxia, or cardiac tamponade unmasked by volume shifts. Hemorrhage may result from anticoagulation or platelet dysfunction related to renal failure. Shortness of breath may be caused by volume overload, tamponade, pericardial effusion, pulmonary embolism, air embolism, hemorrhage, or anaphylaxis. Chest pain may be ischemic due to high prevalence of atherosclerotic disease or pleuritic from pericarditis or pulmonary embolism. Neurologic dysfunction may occur due to disequilibrium syndrome caused by rapid decreases in serum osmolality during dialysis.
Peritoneal complications include peritonitis from contamination during exchanges, most commonly due to Staphylococcus aureus or Staphylococcus epidermidis. Perforated viscus presents with severe abdominal pain, fever, feculent effluent, or focal tenderness. Fibrinous catheter blockage may occur secondary to infection or inflammation.
Diagnosis
Signs and symptoms Vascular access complications present with bleeding from puncture sites, loss of bruit or thrill, local infection, fever, distal neurologic deficits, or enlarging masses near access sites. Nonvascular complications include hypotension, palpitations, syncope, chest pain, dyspnea, hemorrhage, and neurologic symptoms such as headache, malaise, seizures, or coma. Peritoneal complications present with abdominal pain, cloudy effluent, nausea, vomiting, or inflammation at the Tenckhoff catheter site.
Essential workup
A thorough physical examination is essential, including complete vital signs with auscultated blood pressure, pulse oximetry, and temperature. Evaluate for occult infection, volume overload, pulmonary findings, and cardiac abnormalities such as murmurs or pericardial rubs. Obtain ECG to assess for electrolyte disturbances or ischemia. Perform blood cultures, wound cultures, and peritoneal fluid analysis when infection is suspected. CBC and coagulation studies are required for bleeding. Chest radiograph, arterial blood gas, and cardiac enzymes are indicated for chest pain or dyspnea. Neurologic symptoms warrant brain imaging to exclude intracranial hemorrhage.
Diagnosis tests and interpretation
Lab studies include glucose, electrolytes, BUN, creatinine, and CBC. Imaging includes ECG for suspected hyperkalemia, pericarditis, effusion, or tamponade. Ultrasound of vascular access evaluates thrombosis or stenosis. Echocardiography assesses pericardial effusion or tamponade. CT angiography may be required for suspected pulmonary embolism, with careful coordination regarding contrast load and dialysis planning.
Differential diagnosis
Hypotension may be due to sepsis, cardiogenic shock, myocardial infarction, tamponade, dysrhythmias, electrolyte abnormalities, embolism, hypovolemia, or autonomic dysfunction. Neurologic symptoms may result from stroke, disequilibrium syndrome, metabolic derangements, hypoxemia, intracranial bleeding, infection, or uremia. Peritoneal symptoms require differentiation from hernia incarceration, perforated viscus, appendicitis, or cholecystitis.
Treatment
Pre hospital Avoid IV access and blood pressure measurement in limbs with functioning arteriovenous fistulas or grafts. Administer IV fluids cautiously and minimize volume. Use high-dose furosemide for pulmonary edema in anuric patients when appropriate.
Initial stabilization and therapy
Assess airway, breathing, and circulation. Control vascular access bleeding with firm pressure without fully occluding flow, document thrill afterward, and use hemostatic agents if needed. Treat hypotension by identifying the cause and administering fluids or vasopressors as indicated. Manage dyspnea with preload and afterload reduction and arrange urgent dialysis. Treat hyperkalemia with calcium, insulin with glucose, bicarbonate when appropriate, and cardiac monitoring, followed by dialysis. Address neurologic complications with glucose checks, naloxone, thiamine, and seizure control.
Emergency department treatment and procedures
Initiate empiric antistaphylococcal antibiotics for suspected access infections. Consult vascular surgery urgently for clotted access. Control hemorrhage and correct coagulopathies with fluids and blood products. Manage electrolyte disturbances and volume overload with medications and dialysis. Perform emergent pericardiocentesis for tamponade in unstable patients. Treat acute myocardial infarction according to standard protocols when appropriate. Manage peritonitis with IV or intraperitoneal antibiotics and obtain surgical consultation for suspected perforation.
Medication
Commonly used medications include calcium gluconate for cardioprotection in hyperkalemia, insulin with dextrose, sodium bicarbonate, loop diuretics, nitrates, ACE inhibitors, vasopressors, antistaphylococcal antibiotics, and intraperitoneal antibiotics for peritonitis.
Follow-up disposition
Admission criteria ICU admission is required for severe hyperkalemia, pulmonary edema, persistent hypotension, uncontrolled seizures, acute myocardial infarction, stroke, tamponade, sepsis, or severe peritonitis. General admission is indicated for fever, vomiting, nonsevere peritonitis, or inability to self-manage peritoneal dialysis.
Discharge criteria Patients with mild access-site infections, successful hemostasis, or select same-day thrombectomy procedures may be discharged with close follow-up.
Follow-up recommendations
Most dialysis patients require close follow-up with their nephrologist for ongoing management.
Pearls and pitfalls
Always consider hyperkalemia in dialysis patients. Cardiac tamponade may present atypically. Infections often have subtle presentations yet carry high mortality. Early vascular surgery consultation is critical for clotted or ruptured access sites.
Basics
Description Dialysis complications may be vascular access related, nonvascular access related, or peritoneal. Vascular access complications include infection and bleeding. Nonvascular complications include hypotension and electrolyte disturbances such as hyperkalemia. Peritoneal complications most commonly involve abdominal pain and infection.
Etiology
Vascular access related complications include infections, which are a major cause of morbidity and mortality in dialysis patients and are most often caused by Staphylococcus aureus. These infections may present with localized signs, systemic sepsis, or minimal findings. Thrombosis or stenosis of access sites often presents with loss of bruit or thrill and requires urgent intervention to prevent access loss. Bleeding from access sites can be life-threatening and may be associated with aneurysm formation.
Nonvascular access related complications include hypotension, the most common complication of hemodialysis. This may occur during or after dialysis due to acute intravascular volume depletion, myocardial ischemia, sepsis, dysrhythmias, hypoxia, or cardiac tamponade unmasked by volume shifts. Hemorrhage may result from anticoagulation or platelet dysfunction related to renal failure. Shortness of breath may be caused by volume overload, tamponade, pericardial effusion, pulmonary embolism, air embolism, hemorrhage, or anaphylaxis. Chest pain may be ischemic due to high prevalence of atherosclerotic disease or pleuritic from pericarditis or pulmonary embolism. Neurologic dysfunction may occur due to disequilibrium syndrome caused by rapid decreases in serum osmolality during dialysis.
Peritoneal complications include peritonitis from contamination during exchanges, most commonly due to Staphylococcus aureus or Staphylococcus epidermidis. Perforated viscus presents with severe abdominal pain, fever, feculent effluent, or focal tenderness. Fibrinous catheter blockage may occur secondary to infection or inflammation.
Diagnosis
Signs and symptoms Vascular access complications present with bleeding from puncture sites, loss of bruit or thrill, local infection, fever, distal neurologic deficits, or enlarging masses near access sites. Nonvascular complications include hypotension, palpitations, syncope, chest pain, dyspnea, hemorrhage, and neurologic symptoms such as headache, malaise, seizures, or coma. Peritoneal complications present with abdominal pain, cloudy effluent, nausea, vomiting, or inflammation at the Tenckhoff catheter site.
Essential workup
A thorough physical examination is essential, including complete vital signs with auscultated blood pressure, pulse oximetry, and temperature. Evaluate for occult infection, volume overload, pulmonary findings, and cardiac abnormalities such as murmurs or pericardial rubs. Obtain ECG to assess for electrolyte disturbances or ischemia. Perform blood cultures, wound cultures, and peritoneal fluid analysis when infection is suspected. CBC and coagulation studies are required for bleeding. Chest radiograph, arterial blood gas, and cardiac enzymes are indicated for chest pain or dyspnea. Neurologic symptoms warrant brain imaging to exclude intracranial hemorrhage.
Diagnosis tests and interpretation
Lab studies include glucose, electrolytes, BUN, creatinine, and CBC. Imaging includes ECG for suspected hyperkalemia, pericarditis, effusion, or tamponade. Ultrasound of vascular access evaluates thrombosis or stenosis. Echocardiography assesses pericardial effusion or tamponade. CT angiography may be required for suspected pulmonary embolism, with careful coordination regarding contrast load and dialysis planning.
Differential diagnosis
Hypotension may be due to sepsis, cardiogenic shock, myocardial infarction, tamponade, dysrhythmias, electrolyte abnormalities, embolism, hypovolemia, or autonomic dysfunction. Neurologic symptoms may result from stroke, disequilibrium syndrome, metabolic derangements, hypoxemia, intracranial bleeding, infection, or uremia. Peritoneal symptoms require differentiation from hernia incarceration, perforated viscus, appendicitis, or cholecystitis.
Treatment
Pre hospital Avoid IV access and blood pressure measurement in limbs with functioning arteriovenous fistulas or grafts. Administer IV fluids cautiously and minimize volume. Use high-dose furosemide for pulmonary edema in anuric patients when appropriate.
Initial stabilization and therapy
Assess airway, breathing, and circulation. Control vascular access bleeding with firm pressure without fully occluding flow, document thrill afterward, and use hemostatic agents if needed. Treat hypotension by identifying the cause and administering fluids or vasopressors as indicated. Manage dyspnea with preload and afterload reduction and arrange urgent dialysis. Treat hyperkalemia with calcium, insulin with glucose, bicarbonate when appropriate, and cardiac monitoring, followed by dialysis. Address neurologic complications with glucose checks, naloxone, thiamine, and seizure control.
Emergency department treatment and procedures
Initiate empiric antistaphylococcal antibiotics for suspected access infections. Consult vascular surgery urgently for clotted access. Control hemorrhage and correct coagulopathies with fluids and blood products. Manage electrolyte disturbances and volume overload with medications and dialysis. Perform emergent pericardiocentesis for tamponade in unstable patients. Treat acute myocardial infarction according to standard protocols when appropriate. Manage peritonitis with IV or intraperitoneal antibiotics and obtain surgical consultation for suspected perforation.
Medication
Commonly used medications include calcium gluconate for cardioprotection in hyperkalemia, insulin with dextrose, sodium bicarbonate, loop diuretics, nitrates, ACE inhibitors, vasopressors, antistaphylococcal antibiotics, and intraperitoneal antibiotics for peritonitis.
Follow-up disposition
Admission criteria ICU admission is required for severe hyperkalemia, pulmonary edema, persistent hypotension, uncontrolled seizures, acute myocardial infarction, stroke, tamponade, sepsis, or severe peritonitis. General admission is indicated for fever, vomiting, nonsevere peritonitis, or inability to self-manage peritoneal dialysis.
Discharge criteria Patients with mild access-site infections, successful hemostasis, or select same-day thrombectomy procedures may be discharged with close follow-up.
Follow-up recommendations
Most dialysis patients require close follow-up with their nephrologist for ongoing management.
Pearls and pitfalls
Always consider hyperkalemia in dialysis patients. Cardiac tamponade may present atypically. Infections often have subtle presentations yet carry high mortality. Early vascular surgery consultation is critical for clotted or ruptured access sites.
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Emergency and Acute Medicine - Diabetic Ketoacidosis
Basics
Description Diabetic ketoacidosis (DKA) results from absolute or relative insulin deficiency with excess counterregulatory hormones (catecholamines, glucagon, growth hormone, cortisol). This leads to dehydration from osmotic hyperglycemic diuresis and reduced oral intake, anion gap metabolic acidosis, ketone formation from unrestrained lipolysis and ketogenesis, hyperglycemia from increased gluconeogenesis and glycogenolysis, and significant electrolyte disturbances including hypokalemia, hypo- or hypernatremia, and hypophosphatemia.
Etiology
Medication noncompliance is the most common cause. New-onset diabetes mellitus (type 1 or type 2) is a frequent presentation. Underlying medical illness increases counterregulatory hormones and insulin resistance, including infection, myocardial infarction, gastrointestinal bleeding, and central nervous system events. Pregnancy contributes through relative insulin deficiency. Medications such as protease inhibitors and atypical antipsychotics (e.g., olanzapine, clozapine) and alcohol abuse are additional contributors.
Diagnosis
Signs and symptoms Patients often report polyuria, polydipsia, weakness, abdominal pain, nausea, vomiting, chest pain, febrile illness, and medication noncompliance. Altered mental status may be present. Physical examination commonly reveals tachycardia, hypotension from dehydration or sepsis, tachypnea with hyperpnea, Kussmaul respirations, dehydration with poor skin turgor and dry mucous membranes, ketone odor on the breath, and diffuse abdominal tenderness. Temperature abnormalities may reflect infection.
Essential workup
Diagnostic criteria include venous pH <7.3, serum bicarbonate <15 meq />, hyperglycemia >250 mg/dL, and ketonemia or ketonuria. Initial evaluation requires bedside glucose testing, venous blood gas, serum electrolytes, BUN and creatinine, urine dipstick for ketones, and assessment for a precipitating cause.
Diagnosis tests & interpretation
Lab Serum glucose confirms hyperglycemia. Electrolytes show an increased anion gap metabolic acidosis [Na − (Cl + HCO₃)] >12. Serum sodium may be falsely low due to hyperglycemia and should be corrected by adding 1.6 mEq/L for every 100 mg/dL glucose above 100 mg/dL. Potassium is often normal or elevated initially due to extracellular shift, despite a total body deficit of 3-5 mEq/kg; levels fall rapidly with insulin and fluids. Bicarbonate is typically markedly reduced. BUN and creatinine reflect prerenal azotemia from dehydration. Serum ketones must be present; β-hydroxybutyrate predominates and may be underestimated by nitroprusside testing. Urine ketone dip testing is highly sensitive, and point-of-care β-hydroxybutyrate testing can aid early diagnosis. CBC often shows stress leukocytosis. Serum osmolality may be elevated (>320 mOsm/L). Imaging includes chest radiography for suspected pneumonia, ECG to assess ischemia or potassium abnormalities, and head CT if altered mental status is unexplained.
Differential diagnosis
Other causes of anion gap metabolic acidosis include alcoholic ketoacidosis, lactic acidosis, toxic ingestions (salicylates, methanol, ethylene glycol), uremia, starvation or sepsis, and hyperglycemic hyperosmolar nonketotic syndrome.
Treatment
Pre hospital Early fluid resuscitation is often initiated; total prehospital volume should be documented to guide ongoing therapy.
Initial stabilization/therapy Address airway, breathing, and circulation, particularly in patients with altered mental status. Administer supplemental oxygen as needed and give an initial bolus of 0.9% normal saline for hypotension or tachycardia.
Ed treatment/procedures Continuous cardiac monitoring and pulse oximetry are required for unstable patients. Fluid therapy assumes a total deficit of approximately 100 mL/kg. Administer 1–2 L of 0.9% normal saline in the first hour. Continue isotonic saline if corrected sodium is low, or switch to 0.45% saline if corrected sodium is normal or high. Replace the remaining deficit gradually over 24–36 hours to avoid rapid osmolar shifts. Insulin therapy is initiated with continuous IV regular insulin at 0.1 U/kg/h after confirmation of DKA and adequate potassium levels, titrated to close the anion gap rather than normalize glucose alone. Add dextrose-containing fluids when serum glucose falls below 250–300 mg/dL. Potassium replacement is essential once urine output is established and serum potassium is <5.5 meq />; insulin should be delayed if potassium is <3.5 meq />. Bicarbonate therapy is generally avoided and reserved only for severe acidosis (pH <6.9) with cardiovascular compromise. phosphate and magnesium replacement are not routine but may be required in severe deficiencies. the underlying precipitating cause must identified treated.< />pan>
Medication
Regular insulin infusion at 0.1 U/kg/h IV. Potassium chloride supplementation as indicated. Dextrose-containing IV fluids once glucose levels decline. Magnesium sulfate or phosphate replacement when clinically necessary.
Follow-up disposition
Admission criteria ICU admission is required for severe DKA with pH <7.0, altered mental status, hemodynamic instability, serious comorbid illness, or extremes of age. moderate dka may be managed in a monitored unit, while mild cases without complications observed.< />pan>
Discharge criteria Resolution of anion gap acidosis, tolerance of oral intake, stable vital signs, no ongoing precipitating illness, and reliable follow-up with clear insulin instructions.
Pearls and pitfalls
Insulin infusion should not be reduced or stopped solely because glucose normalizes; it must continue until acidosis and anion gap resolve. Failure to aggressively monitor and replace potassium is a common and dangerous error.
Basics
Description Diabetic ketoacidosis (DKA) results from absolute or relative insulin deficiency with excess counterregulatory hormones (catecholamines, glucagon, growth hormone, cortisol). This leads to dehydration from osmotic hyperglycemic diuresis and reduced oral intake, anion gap metabolic acidosis, ketone formation from unrestrained lipolysis and ketogenesis, hyperglycemia from increased gluconeogenesis and glycogenolysis, and significant electrolyte disturbances including hypokalemia, hypo- or hypernatremia, and hypophosphatemia.
Etiology
Medication noncompliance is the most common cause. New-onset diabetes mellitus (type 1 or type 2) is a frequent presentation. Underlying medical illness increases counterregulatory hormones and insulin resistance, including infection, myocardial infarction, gastrointestinal bleeding, and central nervous system events. Pregnancy contributes through relative insulin deficiency. Medications such as protease inhibitors and atypical antipsychotics (e.g., olanzapine, clozapine) and alcohol abuse are additional contributors.
Diagnosis
Signs and symptoms Patients often report polyuria, polydipsia, weakness, abdominal pain, nausea, vomiting, chest pain, febrile illness, and medication noncompliance. Altered mental status may be present. Physical examination commonly reveals tachycardia, hypotension from dehydration or sepsis, tachypnea with hyperpnea, Kussmaul respirations, dehydration with poor skin turgor and dry mucous membranes, ketone odor on the breath, and diffuse abdominal tenderness. Temperature abnormalities may reflect infection.
Essential workup
Diagnostic criteria include venous pH <7.3, serum bicarbonate <15 meq />, hyperglycemia >250 mg/dL, and ketonemia or ketonuria. Initial evaluation requires bedside glucose testing, venous blood gas, serum electrolytes, BUN and creatinine, urine dipstick for ketones, and assessment for a precipitating cause.
Diagnosis tests & interpretation
Lab Serum glucose confirms hyperglycemia. Electrolytes show an increased anion gap metabolic acidosis [Na − (Cl + HCO₃)] >12. Serum sodium may be falsely low due to hyperglycemia and should be corrected by adding 1.6 mEq/L for every 100 mg/dL glucose above 100 mg/dL. Potassium is often normal or elevated initially due to extracellular shift, despite a total body deficit of 3-5 mEq/kg; levels fall rapidly with insulin and fluids. Bicarbonate is typically markedly reduced. BUN and creatinine reflect prerenal azotemia from dehydration. Serum ketones must be present; β-hydroxybutyrate predominates and may be underestimated by nitroprusside testing. Urine ketone dip testing is highly sensitive, and point-of-care β-hydroxybutyrate testing can aid early diagnosis. CBC often shows stress leukocytosis. Serum osmolality may be elevated (>320 mOsm/L). Imaging includes chest radiography for suspected pneumonia, ECG to assess ischemia or potassium abnormalities, and head CT if altered mental status is unexplained.
Differential diagnosis
Other causes of anion gap metabolic acidosis include alcoholic ketoacidosis, lactic acidosis, toxic ingestions (salicylates, methanol, ethylene glycol), uremia, starvation or sepsis, and hyperglycemic hyperosmolar nonketotic syndrome.
Treatment
Pre hospital Early fluid resuscitation is often initiated; total prehospital volume should be documented to guide ongoing therapy.
Initial stabilization/therapy Address airway, breathing, and circulation, particularly in patients with altered mental status. Administer supplemental oxygen as needed and give an initial bolus of 0.9% normal saline for hypotension or tachycardia.
Ed treatment/procedures Continuous cardiac monitoring and pulse oximetry are required for unstable patients. Fluid therapy assumes a total deficit of approximately 100 mL/kg. Administer 1–2 L of 0.9% normal saline in the first hour. Continue isotonic saline if corrected sodium is low, or switch to 0.45% saline if corrected sodium is normal or high. Replace the remaining deficit gradually over 24–36 hours to avoid rapid osmolar shifts. Insulin therapy is initiated with continuous IV regular insulin at 0.1 U/kg/h after confirmation of DKA and adequate potassium levels, titrated to close the anion gap rather than normalize glucose alone. Add dextrose-containing fluids when serum glucose falls below 250–300 mg/dL. Potassium replacement is essential once urine output is established and serum potassium is <5.5 meq />; insulin should be delayed if potassium is <3.5 meq />. Bicarbonate therapy is generally avoided and reserved only for severe acidosis (pH <6.9) with cardiovascular compromise. phosphate and magnesium replacement are not routine but may be required in severe deficiencies. the underlying precipitating cause must identified treated.< />pan>
Medication
Regular insulin infusion at 0.1 U/kg/h IV. Potassium chloride supplementation as indicated. Dextrose-containing IV fluids once glucose levels decline. Magnesium sulfate or phosphate replacement when clinically necessary.
Follow-up disposition
Admission criteria ICU admission is required for severe DKA with pH <7.0, altered mental status, hemodynamic instability, serious comorbid illness, or extremes of age. moderate dka may be managed in a monitored unit, while mild cases without complications observed.< />pan>
Discharge criteria Resolution of anion gap acidosis, tolerance of oral intake, stable vital signs, no ongoing precipitating illness, and reliable follow-up with clear insulin instructions.
Pearls and pitfalls
Insulin infusion should not be reduced or stopped solely because glucose normalizes; it must continue until acidosis and anion gap resolve. Failure to aggressively monitor and replace potassium is a common and dangerous error.
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Emergency And Acute Medicine – Adult Diarrhea
Basics
Description Diarrhea is defined as frequent bowel movements (>3/day) that are loose and watery, most commonly due to infectious agents or toxin exposure.
Etiology
Viruses Account for 50–70% of cases.
Invasive bacteria
Campylobacter: Contaminated food or water, wilderness water, birds, animals; most common bacterial cause; gross or occult blood in 60–90%.
Salmonella: Contaminated water, eggs, poultry, dairy; Salmonella typhi causes typhoid fever with sustained fever, abdominal pain, rose spots, splenomegaly, and bradycardia.
Shigella: Fecal–oral transmission.
Vibrio parahaemolyticus: Raw or undercooked seafood.
Yersinia: Contaminated pork, water, milk; may mimic appendicitis or present as mesenteric adenitis.
Bacterial toxin–mediated
Escherichia coli: Major cause of traveler’s diarrhea; fecal contamination of food or water.
Staphylococcus aureus: Most common toxin-related illness; symptoms 1–6 hr after ingestion.
Bacillus cereus: Classically from reheated fried rice; symptoms within 1–36 hr.
Clostridium difficile: Antibiotic-associated enteritis and pseudomembranous colitis; onset within 10 days of antibiotic exposure.
Aeromonas hydrophila: Aquatic exposure; typically affects children <3 yr; fecal leukocytes absent.< />pan>
Cholera (Vibrio cholerae): Enterotoxin-mediated; profuse “rice-water” stools.
Protozoa
Giardia lamblia: Most common parasitic cause in North America; associated with travel, daycare, institutions, men who have sex with men, and untreated mountain water.
Cryptosporidium parvum: Common in patients with AIDS.
Entamoeba histolytica: May cause extraintestinal disease, including hepatic amebic abscess.
Pediatric considerations Most cases are viral and self-limited; rotavirus accounts for ~50%. Shigella may be associated with seizures. Assessment should focus on hydration status.
Diagnosis
Signs And Symptoms
History Loose or watery stools, bloody stools with mucus, abdominal cramps, tenesmus, flatulence, fever, headache, myalgias, nausea, vomiting, dehydration, lethargy, or stupor.
Physical exam Dry mucous membranes, abdominal tenderness, perianal inflammation, fissures, or fistulae.
Essential Workup Digital rectal exam for gross or occult blood. Fecal leukocytes suggest invasive bacterial infection and are absent in viral, protozoal, or toxin-mediated diarrhea.
Diagnosis Tests And Interpretation
Lab
CBC for significant blood loss or systemic toxicity.
Electrolytes, glucose, BUN, creatinine for lethargy, dehydration, toxicity, altered mental status, diuretic use, or chronic liver/renal disease.
Stool culture if fecal leukocytes present or in immunocompromised patients, travelers, men who have sex with men, food handlers, healthcare workers, daycare workers, or institutionalized patients.
Blood cultures if bacteremia suspected, patient requires admission, or is immunocompromised, elderly, or an infant.
Imaging Abdominal radiographs only if obstruction or toxic megacolon is suspected.
Differential Diagnosis Ulcerative colitis, Crohn disease, mesenteric ischemia, diverticulitis, anal fissures, hemorrhoids, irritable bowel syndrome, food allergies, malrotation with volvulus, Meckel diverticulum, intussusception, appendicitis, drugs and toxins (mannitol, sorbitol, magnesium antacids, quinidine, colchicine), mushrooms, mercury poisoning.
Treatment
Prehospital Establish IV access if severe dehydration; avoid exposure to contaminated body fluids.
Initial stabilization and therapy Assess airway, breathing, circulation. Begin IV 0.9% normal saline for severe dehydration.
Emergency department treatment and procedures
Oral rehydration for mild dehydration (oral rehydration solutions).
IV fluids for hypotension, persistent vomiting, obtundation, metabolic acidosis, or severe electrolyte abnormalities.
Bismuth subsalicylate for symptomatic relief.
Kaolin-pectin reduces stool liquidity but does not alter disease course.
Antimotility agents (loperamide, diphenoxylate) may be used cautiously in noninfectious diarrhea; avoid prolonged use in infectious diarrhea due to risk of toxic megacolon and bacteremia.
Targeted antibiotics for confirmed or strongly suspected bacterial or protozoal infections.
Medication
Ampicillin, TMP-SMX, ceftriaxone, ciprofloxacin, doxycycline, erythromycin, iodoquinol, metronidazole, quinacrine, tetracycline, or oral vancomycin as indicated by organism and patient factors.
Follow-Up Disposition
Admission criteria Hypotension refractory to fluids, significant bleeding, sepsis or toxicity, intractable vomiting or abdominal pain, severe electrolyte imbalance, metabolic acidosis, altered mental status, or children with >10–15% dehydration.
Discharge criteria Mild disease with adequate oral intake or dehydration responsive to IV fluids.
Issues for referral Prolonged or recurrent diarrhea may require gastroenterology evaluation.
Follow-Up Recommendations Most cases are self-limited; routine follow-up is optional unless symptoms persist.
Pearls And Pitfalls Avoid prolonged antimotility therapy in infectious diarrhea. TMP-SMX, ciprofloxacin, doxycycline, and tetracycline are contraindicated in pregnancy; metronidazole may be used in the third trimester. Healthcare workers and food handlers with infectious diarrhea may require public health clearance before returning to work. Clostridioides difficile infection is increasingly common, particularly in nursing home populations.
Basics
Description Diarrhea is defined as frequent bowel movements (>3/day) that are loose and watery, most commonly due to infectious agents or toxin exposure.
Etiology
Viruses Account for 50–70% of cases.
Invasive bacteria
Campylobacter: Contaminated food or water, wilderness water, birds, animals; most common bacterial cause; gross or occult blood in 60–90%.
Salmonella: Contaminated water, eggs, poultry, dairy; Salmonella typhi causes typhoid fever with sustained fever, abdominal pain, rose spots, splenomegaly, and bradycardia.
Shigella: Fecal–oral transmission.
Vibrio parahaemolyticus: Raw or undercooked seafood.
Yersinia: Contaminated pork, water, milk; may mimic appendicitis or present as mesenteric adenitis.
Bacterial toxin–mediated
Escherichia coli: Major cause of traveler’s diarrhea; fecal contamination of food or water.
Staphylococcus aureus: Most common toxin-related illness; symptoms 1–6 hr after ingestion.
Bacillus cereus: Classically from reheated fried rice; symptoms within 1–36 hr.
Clostridium difficile: Antibiotic-associated enteritis and pseudomembranous colitis; onset within 10 days of antibiotic exposure.
Aeromonas hydrophila: Aquatic exposure; typically affects children <3 yr; fecal leukocytes absent.< />pan>
Cholera (Vibrio cholerae): Enterotoxin-mediated; profuse “rice-water” stools.
Protozoa
Giardia lamblia: Most common parasitic cause in North America; associated with travel, daycare, institutions, men who have sex with men, and untreated mountain water.
Cryptosporidium parvum: Common in patients with AIDS.
Entamoeba histolytica: May cause extraintestinal disease, including hepatic amebic abscess.
Pediatric considerations Most cases are viral and self-limited; rotavirus accounts for ~50%. Shigella may be associated with seizures. Assessment should focus on hydration status.
Diagnosis
Signs And Symptoms
History Loose or watery stools, bloody stools with mucus, abdominal cramps, tenesmus, flatulence, fever, headache, myalgias, nausea, vomiting, dehydration, lethargy, or stupor.
Physical exam Dry mucous membranes, abdominal tenderness, perianal inflammation, fissures, or fistulae.
Essential Workup Digital rectal exam for gross or occult blood. Fecal leukocytes suggest invasive bacterial infection and are absent in viral, protozoal, or toxin-mediated diarrhea.
Diagnosis Tests And Interpretation
Lab
CBC for significant blood loss or systemic toxicity.
Electrolytes, glucose, BUN, creatinine for lethargy, dehydration, toxicity, altered mental status, diuretic use, or chronic liver/renal disease.
Stool culture if fecal leukocytes present or in immunocompromised patients, travelers, men who have sex with men, food handlers, healthcare workers, daycare workers, or institutionalized patients.
Blood cultures if bacteremia suspected, patient requires admission, or is immunocompromised, elderly, or an infant.
Imaging Abdominal radiographs only if obstruction or toxic megacolon is suspected.
Differential Diagnosis Ulcerative colitis, Crohn disease, mesenteric ischemia, diverticulitis, anal fissures, hemorrhoids, irritable bowel syndrome, food allergies, malrotation with volvulus, Meckel diverticulum, intussusception, appendicitis, drugs and toxins (mannitol, sorbitol, magnesium antacids, quinidine, colchicine), mushrooms, mercury poisoning.
Treatment
Prehospital Establish IV access if severe dehydration; avoid exposure to contaminated body fluids.
Initial stabilization and therapy Assess airway, breathing, circulation. Begin IV 0.9% normal saline for severe dehydration.
Emergency department treatment and procedures
Oral rehydration for mild dehydration (oral rehydration solutions).
IV fluids for hypotension, persistent vomiting, obtundation, metabolic acidosis, or severe electrolyte abnormalities.
Bismuth subsalicylate for symptomatic relief.
Kaolin-pectin reduces stool liquidity but does not alter disease course.
Antimotility agents (loperamide, diphenoxylate) may be used cautiously in noninfectious diarrhea; avoid prolonged use in infectious diarrhea due to risk of toxic megacolon and bacteremia.
Targeted antibiotics for confirmed or strongly suspected bacterial or protozoal infections.
Medication
Ampicillin, TMP-SMX, ceftriaxone, ciprofloxacin, doxycycline, erythromycin, iodoquinol, metronidazole, quinacrine, tetracycline, or oral vancomycin as indicated by organism and patient factors.
Follow-Up Disposition
Admission criteria Hypotension refractory to fluids, significant bleeding, sepsis or toxicity, intractable vomiting or abdominal pain, severe electrolyte imbalance, metabolic acidosis, altered mental status, or children with >10–15% dehydration.
Discharge criteria Mild disease with adequate oral intake or dehydration responsive to IV fluids.
Issues for referral Prolonged or recurrent diarrhea may require gastroenterology evaluation.
Follow-Up Recommendations Most cases are self-limited; routine follow-up is optional unless symptoms persist.
Pearls And Pitfalls Avoid prolonged antimotility therapy in infectious diarrhea. TMP-SMX, ciprofloxacin, doxycycline, and tetracycline are contraindicated in pregnancy; metronidazole may be used in the third trimester. Healthcare workers and food handlers with infectious diarrhea may require public health clearance before returning to work. Clostridioides difficile infection is increasingly common, particularly in nursing home populations.
- Published on
Emergency And Acute Medicine – Diaper Rash
Basics
Description Very common dermatologic disorder of infancy. Most frequent in the first month of life and again between 12–24 months. In adult incontinent patients, incidence ranges from 5.7% to more than 42% and increases with age. Diaper rash is most often a primary irritant or contact dermatitis in which disruption of the outer skin layers leads to inflammation, impairment of normal skin microflora, and loss of barrier function. Excess moisture promotes microbial overgrowth. Secondary fungal or bacterial infection may result in more severe disease. Also referred to as irritant diaper dermatitis.
Etiology
Irritants Moisture from prolonged overhydration due to infrequent diaper changes, poorly absorbent or cloth diapers, and urinary or fecal incontinence in adults. Friction from diaper rubbing or loose-fitting diapers. Chemical irritation from prolonged exposure to stool enzymes, urine, scented wipes, soaps, diaper materials, or adhesives.
Infection Candida albicans is isolated in up to 80% of infants, particularly after systemic antibiotic use. Bacterial infection is usually secondary and commonly involves Staphylococcus aureus, Streptococcus, or Escherichia coli, with occasional Peptostreptococcus and Bacteroides. Other etiologies include seborrheic diaper dermatitis and atopic (contact) diaper dermatitis. Risk factors include oral thrush, multiple prior episodes, prolonged diaper use, and diarrhea.
Diagnosis
Diagnosis is typically clinical and based on the appearance and distribution of the rash.
Signs And Symptoms
History The child may cry during diaper changes or wiping and may appear irritable.
Physical exam Irritant dermatitis presents as beefy-red confluent patches with sharp borders at the diaper edges, usually sparing skin folds. Candidal dermatitis appears as a well-demarcated erythematous rash with satellite pustules or papules and commonly involves skin folds. Bacterial infection may cause superficial erosions with yellow crusting or bullae. Seborrheic diaper dermatitis presents with erythematous plaques and greasy yellow or gray scale and is often associated with scalp involvement. Atopic diaper dermatitis resembles irritant dermatitis but includes lesions on other areas such as the face. Variants include Jacquet erosive dermatitis with ulcers or erosions, psoriasiform dermatitis with silvery scale and spared folds, and granuloma gluteale infantum characterized by violaceous papules or nodules that resolve over weeks to months and may scar.
Essential Workup
Assess diaper-changing practices and urinary and fecal habits. Examine other body areas for associated rashes. Consider child abuse or neglect by evaluating hygiene and looking for burns or other trauma.
Diagnosis Tests And Interpretation
Laboratory testing is usually unnecessary. Bacterial cultures are reserved for complicated cases. Skin scrapings with potassium hydroxide preparation or culture may help distinguish candidal infection from atypical seborrheic dermatitis by identifying budding yeast or pseudohyphae.
Differential Diagnosis
Includes child abuse or neglect, impetigo, scabies, herpes simplex, varicella, congenital syphilis, psoriasis, atopic dermatitis, seborrheic dermatitis, papular urticaria, bullous pemphigoid, epidermolysis bullosa, acrodermatitis enteropathica, acrodermatitis enteropathica–like eruption, and Langerhans cell histiocytosis.
Treatment
Emergency department treatment and procedures Management focuses on reducing moisture, minimizing contact with urine and feces, and treating infection when present. Cleanse gently with water and cotton balls; avoid wipes, talcum powder, harsh soaps, and alcohol. Change diapers frequently, allow air drying, and keep the area uncovered when possible. Use highly absorbent disposable diapers and avoid cloth diapers during active dermatitis.
Barrier creams Zinc oxide, petroleum, or lanolin applied after each diaper change and continued after resolution to prevent recurrence. Apply over antifungal medication if Candida is present.
Corticosteroids Low-potency topical hydrocortisone (≤1%) for short courses in moderate to severe inflammation; discontinue after 3–5 days.
Antifungals Nystatin, clotrimazole, miconazole, or ciclopirox applied after diaper changes and continued for 1–2 days after clearing. Consider oral antifungal therapy in refractory cases or with concurrent oral candidiasis.
Antibacterials Topical mupirocin if bacterial infection is suspected; systemic antibiotics are rarely required.
Medication
Ciclopirox 0.77% cream, gel, or suspension applied topically twice daily after diaper changes. Clotrimazole 1% cream applied twice daily after diaper changes. Hydrocortisone 0.5–1% cream applied twice daily. Miconazole 2% cream applied twice daily after diaper changes. Miconazole nitrate 0.25% ointment applied after diaper changes and bathing. Mupirocin 2% ointment or cream applied 3–5 times daily after diaper changes in infants older than 3 months. Nystatin 100,000 U/g cream, powder, or ointment applied twice daily after diaper changes.
Follow-Up Disposition
Admission criteria Evidence of child abuse or neglect or signs of sepsis.
Basics
Description Very common dermatologic disorder of infancy. Most frequent in the first month of life and again between 12–24 months. In adult incontinent patients, incidence ranges from 5.7% to more than 42% and increases with age. Diaper rash is most often a primary irritant or contact dermatitis in which disruption of the outer skin layers leads to inflammation, impairment of normal skin microflora, and loss of barrier function. Excess moisture promotes microbial overgrowth. Secondary fungal or bacterial infection may result in more severe disease. Also referred to as irritant diaper dermatitis.
Etiology
Irritants Moisture from prolonged overhydration due to infrequent diaper changes, poorly absorbent or cloth diapers, and urinary or fecal incontinence in adults. Friction from diaper rubbing or loose-fitting diapers. Chemical irritation from prolonged exposure to stool enzymes, urine, scented wipes, soaps, diaper materials, or adhesives.
Infection Candida albicans is isolated in up to 80% of infants, particularly after systemic antibiotic use. Bacterial infection is usually secondary and commonly involves Staphylococcus aureus, Streptococcus, or Escherichia coli, with occasional Peptostreptococcus and Bacteroides. Other etiologies include seborrheic diaper dermatitis and atopic (contact) diaper dermatitis. Risk factors include oral thrush, multiple prior episodes, prolonged diaper use, and diarrhea.
Diagnosis
Diagnosis is typically clinical and based on the appearance and distribution of the rash.
Signs And Symptoms
History The child may cry during diaper changes or wiping and may appear irritable.
Physical exam Irritant dermatitis presents as beefy-red confluent patches with sharp borders at the diaper edges, usually sparing skin folds. Candidal dermatitis appears as a well-demarcated erythematous rash with satellite pustules or papules and commonly involves skin folds. Bacterial infection may cause superficial erosions with yellow crusting or bullae. Seborrheic diaper dermatitis presents with erythematous plaques and greasy yellow or gray scale and is often associated with scalp involvement. Atopic diaper dermatitis resembles irritant dermatitis but includes lesions on other areas such as the face. Variants include Jacquet erosive dermatitis with ulcers or erosions, psoriasiform dermatitis with silvery scale and spared folds, and granuloma gluteale infantum characterized by violaceous papules or nodules that resolve over weeks to months and may scar.
Essential Workup
Assess diaper-changing practices and urinary and fecal habits. Examine other body areas for associated rashes. Consider child abuse or neglect by evaluating hygiene and looking for burns or other trauma.
Diagnosis Tests And Interpretation
Laboratory testing is usually unnecessary. Bacterial cultures are reserved for complicated cases. Skin scrapings with potassium hydroxide preparation or culture may help distinguish candidal infection from atypical seborrheic dermatitis by identifying budding yeast or pseudohyphae.
Differential Diagnosis
Includes child abuse or neglect, impetigo, scabies, herpes simplex, varicella, congenital syphilis, psoriasis, atopic dermatitis, seborrheic dermatitis, papular urticaria, bullous pemphigoid, epidermolysis bullosa, acrodermatitis enteropathica, acrodermatitis enteropathica–like eruption, and Langerhans cell histiocytosis.
Treatment
Emergency department treatment and procedures Management focuses on reducing moisture, minimizing contact with urine and feces, and treating infection when present. Cleanse gently with water and cotton balls; avoid wipes, talcum powder, harsh soaps, and alcohol. Change diapers frequently, allow air drying, and keep the area uncovered when possible. Use highly absorbent disposable diapers and avoid cloth diapers during active dermatitis.
Barrier creams Zinc oxide, petroleum, or lanolin applied after each diaper change and continued after resolution to prevent recurrence. Apply over antifungal medication if Candida is present.
Corticosteroids Low-potency topical hydrocortisone (≤1%) for short courses in moderate to severe inflammation; discontinue after 3–5 days.
Antifungals Nystatin, clotrimazole, miconazole, or ciclopirox applied after diaper changes and continued for 1–2 days after clearing. Consider oral antifungal therapy in refractory cases or with concurrent oral candidiasis.
Antibacterials Topical mupirocin if bacterial infection is suspected; systemic antibiotics are rarely required.
Medication
Ciclopirox 0.77% cream, gel, or suspension applied topically twice daily after diaper changes. Clotrimazole 1% cream applied twice daily after diaper changes. Hydrocortisone 0.5–1% cream applied twice daily. Miconazole 2% cream applied twice daily after diaper changes. Miconazole nitrate 0.25% ointment applied after diaper changes and bathing. Mupirocin 2% ointment or cream applied 3–5 times daily after diaper changes in infants older than 3 months. Nystatin 100,000 U/g cream, powder, or ointment applied twice daily after diaper changes.
Follow-Up Disposition
Admission criteria Evidence of child abuse or neglect or signs of sepsis.
- Published on
Emergency And Acute Medicine – Diaphragmatic Trauma
Basics
Description Diaphragmatic trauma results from either penetrating or blunt mechanisms. Penetrating injury involves violation of the diaphragm by an object, most commonly stab or gunshot wounds. Any portion of the diaphragm may be involved, and defects are usually smaller than those from blunt injury, making them more likely to be missed. Blunt injury occurs when a sudden increase in intra-abdominal or intrathoracic pressure is transmitted to the diaphragm, leading to rupture, most often due to motor vehicle crashes. Injuries are more commonly left-sided because the left hemidiaphragm has a posterolateral embryologic point of weakness, whereas the right hemidiaphragm is relatively protected by the liver. Blunt injuries tend to be larger, frequently measuring 5–15 cm. Diaphragmatic defects do not heal spontaneously because the pleuroperitoneal pressure gradient, which may exceed 100 cm H₂O during maximal respiratory effort, promotes progressive herniation of abdominal contents into the chest.
Epidemiology
Incidence Diaphragmatic injury is uncommon, accounting for less than 1% of all traumatic injuries.
Etiology Lateral torso impact is approximately three times more likely to cause ipsilateral diaphragmatic rupture than frontal impact. Diaphragmatic injury should be suspected in penetrating trauma to the thoracoabdominal region and in injuries that cross the plane of the diaphragm.
Diagnosis
Alert In the acute phase, abdominal visceral herniation may be absent, and the injury can be missed even during initial laparotomy or laparoscopy.
Signs And Symptoms Clinical presentation varies depending on whether the phase is acute, latent, or obstructive.
Acute phase Patients may present with tachypnea, hypotension, absent or diminished breath sounds, abdominal distention, or bowel sounds heard in the chest.
Latent phase Symptoms include intermittent abdominal discomfort from herniation of abdominal contents into the thorax, postprandial abdominal pain, worsening pain when supine, left shoulder pain, nausea, vomiting, or belching.
Obstructive phase Patients develop severe abdominal pain, obstipation, nausea, vomiting, and abdominal distention. Strangulated abdominal organs may perforate, spilling contents into the chest and leading to respiratory compromise, sepsis, and death. Obstructive presentations are often delayed.
Essential Workup Chest radiography may reveal herniated bowel loops or abdominal viscera in the thorax. A nasogastric tube visualized above the diaphragm is pathognomonic. More commonly, findings are nonspecific and include elevated hemidiaphragm, irregular diaphragmatic contour, mediastinal shift away from the affected side, unilateral pleural thickening or effusion, basal atelectasis or consolidation, or small hemothorax or pneumothorax. Up to 50% of initial chest radiographs may be normal. Diagnosis is particularly challenging in the latent phase due to intermittent herniation. Contrast gastrointestinal studies may be helpful.
Diagnosis Tests And Interpretation
Lab No laboratory study definitively confirms or excludes diaphragmatic injury. If diagnostic peritoneal lavage is performed after penetrating trauma, a red blood cell count of ≥1,000 RBC/mm³ is considered positive, though false-negative results occur in up to 40% of isolated injuries.
Imaging Chest radiography is diagnostic in up to 90% of cases when herniation is present but has limited sensitivity without acute hernia. Gastrointestinal contrast studies are most useful for diagnosing chronic herniation. Ultrasound may aid diagnosis, particularly on the right side with hepatic herniation. Conventional CT has poor sensitivity, whereas helical and multidetector CT significantly improve detection of subtle injuries. MRI visualizes the diaphragm well but is impractical in acute trauma.
Diagnostic procedures or surgery Diagnostic pneumoperitoneography involves injecting air through a diagnostic peritoneal lavage catheter; pneumothorax on subsequent chest radiograph confirms diaphragmatic injury. This technique is poorly tolerated in unstable patients and may necessitate chest tube placement. Thoracoscopic or laparoscopic exploration may be indicated when suspicion remains high despite negative imaging and allows minimally invasive repair.
Differential Diagnosis Atelectasis, hemothorax, pneumothorax, pulmonary contusion, gastric dilation, intra-abdominal fluid, traumatic pneumatocele, subdiaphragmatic abscess, intrathoracic cyst, empyema, and congenital eventration of the diaphragm.
Treatment
Alert Herniation of abdominal contents into the chest may mimic hemothorax or tension pneumothorax. Bowel sounds in the chest can help differentiate. Be cautious with needle or tube thoracostomy in patients with lateral chest compression; fecal thorax has been reported after bowel rupture.
Initial stabilization and therapy Follow advanced trauma life support protocols. In patients with respiratory distress, immediate nasogastric tube placement may decompress herniated abdominal contents.
Emergency department treatment and procedures Palpate the chest cavity for visceral organs before chest tube insertion. Patients with visceral perforation are septic and require aggressive resuscitation and empiric broad-spectrum antibiotics. Early surgical intervention is critical, and minimally invasive repair may be feasible in selected cases.
Medication Empiric antimicrobial coverage for perforated viscera includes agents targeting gram-negative aerobes and anaerobes. Options include gentamicin, clindamycin, metronidazole, ampicillin–sulbactam, cefotetan, cefoxitin, or ticarcillin–clavulanate, with pediatric dosing adjusted appropriately.
Follow-Up Disposition
Admission criteria Any patient with confirmed or suspected diaphragmatic injury must be admitted to trauma surgery, typically to a monitored unit or intensive care setting.
Discharge criteria Patients with diaphragmatic injury or significant suspicion for it should not be discharged from the emergency department.
Follow-Up Recommendations Patients who undergo diaphragmatic repair require follow-up with a trauma surgeon to monitor for recurrence.
Pediatric Considerations Pediatric anatomic features predispose children to diaphragmatic injury from less severe mechanisms, including a thinner abdominal wall, more horizontal diaphragm, and greater cartilaginous rib composition. Right- and left-sided injuries occur with equal frequency and are more likely to be isolated.
Pearls And Pitfalls Overall mortality ranges from 18% to 40%, depending on mechanism, and is highly associated with concomitant injuries to the spleen, liver, lungs, and pelvis. Maintain a high index of suspicion with left-sided upper abdominal or lower thoracic penetrating trauma. Delayed diagnosis increases the risk of herniation and strangulation of abdominal organs. Chest imaging should always be obtained.
Basics
Description Diaphragmatic trauma results from either penetrating or blunt mechanisms. Penetrating injury involves violation of the diaphragm by an object, most commonly stab or gunshot wounds. Any portion of the diaphragm may be involved, and defects are usually smaller than those from blunt injury, making them more likely to be missed. Blunt injury occurs when a sudden increase in intra-abdominal or intrathoracic pressure is transmitted to the diaphragm, leading to rupture, most often due to motor vehicle crashes. Injuries are more commonly left-sided because the left hemidiaphragm has a posterolateral embryologic point of weakness, whereas the right hemidiaphragm is relatively protected by the liver. Blunt injuries tend to be larger, frequently measuring 5–15 cm. Diaphragmatic defects do not heal spontaneously because the pleuroperitoneal pressure gradient, which may exceed 100 cm H₂O during maximal respiratory effort, promotes progressive herniation of abdominal contents into the chest.
Epidemiology
Incidence Diaphragmatic injury is uncommon, accounting for less than 1% of all traumatic injuries.
Etiology Lateral torso impact is approximately three times more likely to cause ipsilateral diaphragmatic rupture than frontal impact. Diaphragmatic injury should be suspected in penetrating trauma to the thoracoabdominal region and in injuries that cross the plane of the diaphragm.
Diagnosis
Alert In the acute phase, abdominal visceral herniation may be absent, and the injury can be missed even during initial laparotomy or laparoscopy.
Signs And Symptoms Clinical presentation varies depending on whether the phase is acute, latent, or obstructive.
Acute phase Patients may present with tachypnea, hypotension, absent or diminished breath sounds, abdominal distention, or bowel sounds heard in the chest.
Latent phase Symptoms include intermittent abdominal discomfort from herniation of abdominal contents into the thorax, postprandial abdominal pain, worsening pain when supine, left shoulder pain, nausea, vomiting, or belching.
Obstructive phase Patients develop severe abdominal pain, obstipation, nausea, vomiting, and abdominal distention. Strangulated abdominal organs may perforate, spilling contents into the chest and leading to respiratory compromise, sepsis, and death. Obstructive presentations are often delayed.
Essential Workup Chest radiography may reveal herniated bowel loops or abdominal viscera in the thorax. A nasogastric tube visualized above the diaphragm is pathognomonic. More commonly, findings are nonspecific and include elevated hemidiaphragm, irregular diaphragmatic contour, mediastinal shift away from the affected side, unilateral pleural thickening or effusion, basal atelectasis or consolidation, or small hemothorax or pneumothorax. Up to 50% of initial chest radiographs may be normal. Diagnosis is particularly challenging in the latent phase due to intermittent herniation. Contrast gastrointestinal studies may be helpful.
Diagnosis Tests And Interpretation
Lab No laboratory study definitively confirms or excludes diaphragmatic injury. If diagnostic peritoneal lavage is performed after penetrating trauma, a red blood cell count of ≥1,000 RBC/mm³ is considered positive, though false-negative results occur in up to 40% of isolated injuries.
Imaging Chest radiography is diagnostic in up to 90% of cases when herniation is present but has limited sensitivity without acute hernia. Gastrointestinal contrast studies are most useful for diagnosing chronic herniation. Ultrasound may aid diagnosis, particularly on the right side with hepatic herniation. Conventional CT has poor sensitivity, whereas helical and multidetector CT significantly improve detection of subtle injuries. MRI visualizes the diaphragm well but is impractical in acute trauma.
Diagnostic procedures or surgery Diagnostic pneumoperitoneography involves injecting air through a diagnostic peritoneal lavage catheter; pneumothorax on subsequent chest radiograph confirms diaphragmatic injury. This technique is poorly tolerated in unstable patients and may necessitate chest tube placement. Thoracoscopic or laparoscopic exploration may be indicated when suspicion remains high despite negative imaging and allows minimally invasive repair.
Differential Diagnosis Atelectasis, hemothorax, pneumothorax, pulmonary contusion, gastric dilation, intra-abdominal fluid, traumatic pneumatocele, subdiaphragmatic abscess, intrathoracic cyst, empyema, and congenital eventration of the diaphragm.
Treatment
Alert Herniation of abdominal contents into the chest may mimic hemothorax or tension pneumothorax. Bowel sounds in the chest can help differentiate. Be cautious with needle or tube thoracostomy in patients with lateral chest compression; fecal thorax has been reported after bowel rupture.
Initial stabilization and therapy Follow advanced trauma life support protocols. In patients with respiratory distress, immediate nasogastric tube placement may decompress herniated abdominal contents.
Emergency department treatment and procedures Palpate the chest cavity for visceral organs before chest tube insertion. Patients with visceral perforation are septic and require aggressive resuscitation and empiric broad-spectrum antibiotics. Early surgical intervention is critical, and minimally invasive repair may be feasible in selected cases.
Medication Empiric antimicrobial coverage for perforated viscera includes agents targeting gram-negative aerobes and anaerobes. Options include gentamicin, clindamycin, metronidazole, ampicillin–sulbactam, cefotetan, cefoxitin, or ticarcillin–clavulanate, with pediatric dosing adjusted appropriately.
Follow-Up Disposition
Admission criteria Any patient with confirmed or suspected diaphragmatic injury must be admitted to trauma surgery, typically to a monitored unit or intensive care setting.
Discharge criteria Patients with diaphragmatic injury or significant suspicion for it should not be discharged from the emergency department.
Follow-Up Recommendations Patients who undergo diaphragmatic repair require follow-up with a trauma surgeon to monitor for recurrence.
Pediatric Considerations Pediatric anatomic features predispose children to diaphragmatic injury from less severe mechanisms, including a thinner abdominal wall, more horizontal diaphragm, and greater cartilaginous rib composition. Right- and left-sided injuries occur with equal frequency and are more likely to be isolated.
Pearls And Pitfalls Overall mortality ranges from 18% to 40%, depending on mechanism, and is highly associated with concomitant injuries to the spleen, liver, lungs, and pelvis. Maintain a high index of suspicion with left-sided upper abdominal or lower thoracic penetrating trauma. Delayed diagnosis increases the risk of herniation and strangulation of abdominal organs. Chest imaging should always be obtained.
- Published on
Emergency And Acute Medicine – Diarrhea, Pediatric
Rajender Gattu • Richard Lichenstein
Basics
Description Pediatric diarrhea is one of the most common emergency department complaints, second only to respiratory infections. It is a leading cause of childhood illness and mortality worldwide. Acute infectious enteritis presents with vomiting and diarrhea, most often in children under 5 years of age, who typically experience about two episodes annually. Diarrhea is defined as an acute change in normal bowel habits with increased stool frequency or volume lasting less than 7 days; three or more loose or watery stools per day meet the World Health Organization definition. Diarrhea persisting longer than 2 weeks is considered chronic.
Etiology
Acute enteritis
Infectious causes predominate. Viruses account for 70–80% of cases, most commonly rotavirus, followed by enteric adenovirus and norovirus, particularly in foodborne outbreaks. Bacterial causes account for 10–20% and include Escherichia coli, Salmonella, Shigella, Campylobacter, Yersinia, Vibrio, Clostridioides difficile, and Aeromonas. Parasitic causes represent about 5% and include Giardia lamblia and Cryptosporidium, often waterborne.
Noninfectious causes include postinfectious diarrhea, food allergy or intolerance (cow’s milk protein, soy protein, lactose intolerance), methylxanthines, chemotherapy- or radiation-induced injury, drug-induced diarrhea from antibiotics, laxatives, or antacids, ingestion of heavy metals or toxic plants, vitamin deficiencies (niacin, folate), vitamin excess (vitamin C), and diarrhea associated with other infections such as otitis media, urinary tract infection, pneumonia, meningitis, or appendicitis.
Chronic diarrhea
Dietary excess of sorbitol or fructose, enteric infections in immunocompromised hosts, malnutrition, endocrine disorders such as thyrotoxicosis or pheochromocytoma, inflammatory bowel disease, malabsorption syndromes including cystic fibrosis and celiac disease, and irritable bowel syndrome.
Diagnosis
Signs And Symptoms Frequent loose stools that may be watery, bloody, or mucoid, with possible abdominal pain, fever, anorexia, and tenesmus. Dehydration severity reflects total body water loss and is classified as mild (<5%), moderate (5-10%), or severe (>15%). Severe dehydration is associated with altered mental status, poor muscle tone, dry mucous membranes, decreased skin turgor, depressed fontanelle, hypotension, tachycardia, prolonged capillary refill, decreased urine output, sunken eyes, absent tears, and intense thirst.
History Focus on onset, duration, stool characteristics, urine output, feeding, recent antibiotic use, travel, possible ingestions, immunodeficiency, and underlying intestinal disease.
Physical exam Key findings include abnormal respiratory pattern, decreased skin turgor, and prolonged capillary refill, which together are the most reliable indicators of dehydration.
Essential Workup Most children with acute diarrhea require no laboratory testing. Evaluation is indicated for high fever, systemic illness, bloody diarrhea, symptoms lasting more than 2 weeks, tenesmus, or dehydration beyond mild severity requiring parenteral therapy.
Diagnosis Tests And Interpretation
Lab CBC, blood culture, urinalysis, and urine culture if systemic infection is suspected. Serum electrolytes, BUN, creatinine, and bicarbonate are useful in children requiring IV fluids; low bicarbonate is a sensitive marker of moderate dehydration. Stool pH <5.5 or positive reducing substances suggest lactose intolerance. stool microscopy showing>5 fecal leukocytes per high-power field suggests invasive bacterial infection. Stool cultures are reserved for cases with bloody stools or high likelihood of bacterial pathogens.
Imaging Generally not indicated; abdominal radiography or ultrasound may be useful if intussusception, appendicitis, or ileus is suspected.
Differential Diagnosis Postinfectious diarrhea, milk allergy, malrotation with volvulus, inflammatory bowel disease, intussusception, malabsorption syndromes, extraintestinal infections, and medication-induced diarrhea.
Treatment
Initial stabilization and therapy Severely dehydrated children in shock require IV or intraosseous access with 20 mL/kg of 0.9% normal saline; administer dextrose if hypoglycemic. Pulse oximetry and airway support are used as needed.
Emergency department treatment and procedures Mild to moderate dehydration is treated with oral rehydration therapy at 50–100 mL/kg over 4 hours, with additional 10 mL/kg for each stool. Oral rehydration solutions should be low osmolarity with appropriate glucose and sodium content. Moderate to severe dehydration requires IV fluids to replace maintenance and deficit needs. Antibiotics are reserved for defined invasive or severe infections or high-risk patients. Antidiarrheal agents are not recommended. Probiotics such as Lactobacillus GG may reduce duration of illness. Age-appropriate feeding should continue during rehydration, emphasizing complex carbohydrates, lean proteins, fruits, vegetables, yogurt, and avoidance of fatty or high-sugar foods.
Medication Antibiotic selection depends on identified pathogens and includes agents such as TMP-SMX, erythromycin, metronidazole, vancomycin, ceftriaxone, or doxycycline when indicated. Zinc supplementation is recommended for young children.
Follow-Up Disposition
Admission criteria Surgical abdomen, inability to tolerate oral fluids, dehydration ≥10%, toxic appearance, or suspected complicated bacterial enteritis.
Discharge criteria Clinical improvement, adequate hydration, and caregivers capable of providing oral rehydration and recognizing dehydration signs.
Issues for referral Immunocompromised children, seizure-associated illness, or underlying bowel disease.
Follow-Up Recommendations Uncomplicated diarrhea usually requires no routine follow-up. Neonates and high-risk children require close outpatient reassessment.
Pearls And Pitfalls History and physical examination are key to distinguishing benign diarrhea from serious disease. Most children do not need extensive laboratory testing. Antibiotics and antidiarrheal agents have limited roles. Always consider alternative diagnoses such as appendicitis, intussusception, urinary tract infection, and sepsis.
Rajender Gattu • Richard Lichenstein
Basics
Description Pediatric diarrhea is one of the most common emergency department complaints, second only to respiratory infections. It is a leading cause of childhood illness and mortality worldwide. Acute infectious enteritis presents with vomiting and diarrhea, most often in children under 5 years of age, who typically experience about two episodes annually. Diarrhea is defined as an acute change in normal bowel habits with increased stool frequency or volume lasting less than 7 days; three or more loose or watery stools per day meet the World Health Organization definition. Diarrhea persisting longer than 2 weeks is considered chronic.
Etiology
Acute enteritis
Infectious causes predominate. Viruses account for 70–80% of cases, most commonly rotavirus, followed by enteric adenovirus and norovirus, particularly in foodborne outbreaks. Bacterial causes account for 10–20% and include Escherichia coli, Salmonella, Shigella, Campylobacter, Yersinia, Vibrio, Clostridioides difficile, and Aeromonas. Parasitic causes represent about 5% and include Giardia lamblia and Cryptosporidium, often waterborne.
Noninfectious causes include postinfectious diarrhea, food allergy or intolerance (cow’s milk protein, soy protein, lactose intolerance), methylxanthines, chemotherapy- or radiation-induced injury, drug-induced diarrhea from antibiotics, laxatives, or antacids, ingestion of heavy metals or toxic plants, vitamin deficiencies (niacin, folate), vitamin excess (vitamin C), and diarrhea associated with other infections such as otitis media, urinary tract infection, pneumonia, meningitis, or appendicitis.
Chronic diarrhea
Dietary excess of sorbitol or fructose, enteric infections in immunocompromised hosts, malnutrition, endocrine disorders such as thyrotoxicosis or pheochromocytoma, inflammatory bowel disease, malabsorption syndromes including cystic fibrosis and celiac disease, and irritable bowel syndrome.
Diagnosis
Signs And Symptoms Frequent loose stools that may be watery, bloody, or mucoid, with possible abdominal pain, fever, anorexia, and tenesmus. Dehydration severity reflects total body water loss and is classified as mild (<5%), moderate (5-10%), or severe (>15%). Severe dehydration is associated with altered mental status, poor muscle tone, dry mucous membranes, decreased skin turgor, depressed fontanelle, hypotension, tachycardia, prolonged capillary refill, decreased urine output, sunken eyes, absent tears, and intense thirst.
History Focus on onset, duration, stool characteristics, urine output, feeding, recent antibiotic use, travel, possible ingestions, immunodeficiency, and underlying intestinal disease.
Physical exam Key findings include abnormal respiratory pattern, decreased skin turgor, and prolonged capillary refill, which together are the most reliable indicators of dehydration.
Essential Workup Most children with acute diarrhea require no laboratory testing. Evaluation is indicated for high fever, systemic illness, bloody diarrhea, symptoms lasting more than 2 weeks, tenesmus, or dehydration beyond mild severity requiring parenteral therapy.
Diagnosis Tests And Interpretation
Lab CBC, blood culture, urinalysis, and urine culture if systemic infection is suspected. Serum electrolytes, BUN, creatinine, and bicarbonate are useful in children requiring IV fluids; low bicarbonate is a sensitive marker of moderate dehydration. Stool pH <5.5 or positive reducing substances suggest lactose intolerance. stool microscopy showing>5 fecal leukocytes per high-power field suggests invasive bacterial infection. Stool cultures are reserved for cases with bloody stools or high likelihood of bacterial pathogens.
Imaging Generally not indicated; abdominal radiography or ultrasound may be useful if intussusception, appendicitis, or ileus is suspected.
Differential Diagnosis Postinfectious diarrhea, milk allergy, malrotation with volvulus, inflammatory bowel disease, intussusception, malabsorption syndromes, extraintestinal infections, and medication-induced diarrhea.
Treatment
Initial stabilization and therapy Severely dehydrated children in shock require IV or intraosseous access with 20 mL/kg of 0.9% normal saline; administer dextrose if hypoglycemic. Pulse oximetry and airway support are used as needed.
Emergency department treatment and procedures Mild to moderate dehydration is treated with oral rehydration therapy at 50–100 mL/kg over 4 hours, with additional 10 mL/kg for each stool. Oral rehydration solutions should be low osmolarity with appropriate glucose and sodium content. Moderate to severe dehydration requires IV fluids to replace maintenance and deficit needs. Antibiotics are reserved for defined invasive or severe infections or high-risk patients. Antidiarrheal agents are not recommended. Probiotics such as Lactobacillus GG may reduce duration of illness. Age-appropriate feeding should continue during rehydration, emphasizing complex carbohydrates, lean proteins, fruits, vegetables, yogurt, and avoidance of fatty or high-sugar foods.
Medication Antibiotic selection depends on identified pathogens and includes agents such as TMP-SMX, erythromycin, metronidazole, vancomycin, ceftriaxone, or doxycycline when indicated. Zinc supplementation is recommended for young children.
Follow-Up Disposition
Admission criteria Surgical abdomen, inability to tolerate oral fluids, dehydration ≥10%, toxic appearance, or suspected complicated bacterial enteritis.
Discharge criteria Clinical improvement, adequate hydration, and caregivers capable of providing oral rehydration and recognizing dehydration signs.
Issues for referral Immunocompromised children, seizure-associated illness, or underlying bowel disease.
Follow-Up Recommendations Uncomplicated diarrhea usually requires no routine follow-up. Neonates and high-risk children require close outpatient reassessment.
Pearls And Pitfalls History and physical examination are key to distinguishing benign diarrhea from serious disease. Most children do not need extensive laboratory testing. Antibiotics and antidiarrheal agents have limited roles. Always consider alternative diagnoses such as appendicitis, intussusception, urinary tract infection, and sepsis.
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Emergency And Acute Medicine – Congestive Heart Failure
Description
Congestive heart failure is a clinical syndrome in which the heart is unable to maintain adequate circulation to meet metabolic demands. It is characterized by chronic debility, episodes of acute decompensation, and high mortality. Acute decompensated heart failure is a rapidly progressive state developing over hours to days and is a common reason for emergency department presentation, often triggered by a precipitating event that exceeds the heart’s compensatory reserve. Chronic heart failure is a progressive condition evolving over months to years, marked by cardiac remodeling and neurohormonal activation. Subtypes include systolic heart failure with impaired contractility and reduced ejection fraction, diastolic heart failure with impaired ventricular relaxation and filling, low-output failure, high-output failure in which cardiac output is normal or increased but insufficient for metabolic needs, left-sided failure with pulmonary congestion, and right-sided failure characterized by hepatic enlargement, jugular venous distention, and dependent edema. Congestive heart failure affects approximately 5.8 million Americans and represents a major cause of hospitalization and healthcare expenditure.
Etiology
Heart failure results from underlying cardiac disease and acute precipitants. Causes include reduced myocardial contractility from ischemia or infarction, cardiomyopathies, myocarditis, and dysrhythmias; reduced contractile efficiency from medications or metabolic disorders; pressure overload from hypertension, valvular disease, congenital heart disease, pulmonary embolism, or pulmonary hypertension; restricted cardiac output due to infiltrative myocardial disease; volume overload from dietary sodium excess, transfusions, intravenous fluids, or sodium-retaining medications; and high-demand states such as hyperthyroidism, pregnancy, anemia, arteriovenous fistula, beriberi, and Paget disease. Pediatric causes vary by age and include congenital shunt lesions in infancy and acquired myocardial dysfunction in older children and adolescents.
Clinical Features
Symptoms reflect poor perfusion and congestion. Poor perfusion manifests as fatigue, somnolence, lightheadedness, palpitations, cool extremities, worsening renal function, and dyspnea. Congestion presents with exertional dyspnea, cough, orthopnea, paroxysmal nocturnal dyspnea, decreased exercise tolerance, elevated jugular venous pressure, dependent edema, rales or wheezing, pleural effusions, third or fourth heart sounds, displaced apical impulse, hepatic enlargement, nausea, and ascites. Acute decompensated heart failure with hemodynamic instability may cause confusion, anxiety, syncope, tachypnea, tachycardia, hypotension, cool or cyanotic extremities, narrow pulse pressure, pulsus alternans, and Cheyne–Stokes respirations.
Essential Diagnostic Evaluation
Chest radiography is central to confirming the diagnosis and assessing severity, although radiographic changes may lag behind symptom onset and persist after clinical improvement. Continuous reassessment is required.
Diagnostic Tests And Interpretation
Laboratory studies include electrolytes and renal function to establish baseline and guide therapy, complete blood count to assess anemia or infection, liver function tests for hepatic congestion or ischemia, thyroid function tests in older patients or those with atrial fibrillation, and cardiac enzymes to evaluate ischemia. B-type natriuretic peptide is useful for differentiating cardiac from pulmonary causes of dyspnea, with high values supporting heart failure and low values making it unlikely, though interpretation must consider age, obesity, and comorbidities. NT-proBNP may also aid diagnosis. Imaging with chest radiography may reveal cardiomegaly, vascular redistribution, interstitial or alveolar edema, pleural effusions, and classic perihilar patterns. Electrocardiography evaluates ischemia, dysrhythmias, hypertrophy, and conduction abnormalities. Echocardiography provides assessment of ejection fraction, ventricular size, valvular pathology, regional wall motion abnormalities, and pericardial disease.
Differential Diagnosis
Left-sided heart failure must be distinguished from acute exacerbations of chronic obstructive pulmonary disease, asthma, pneumonia, acute respiratory distress syndrome, constrictive pericarditis, anemia, malnutrition, pericardial tamponade, and coarctation of the aorta. Right-sided failure may mimic nephrotic syndrome, chronic renal failure, cirrhosis, pulmonary embolism, sleep-disordered breathing, or venous stasis.
Initial Stabilization And Therapy
Management begins with airway assessment, supplemental oxygen, intravenous access, cardiac monitoring, and electrocardiography. Elevating the head of the bed reduces venous return. Noninvasive positive pressure ventilation is often beneficial to reduce work of breathing and improve oxygenation, while intubation is reserved for impending respiratory failure.
Emergency Department Management
Treatment focuses on optimizing oxygenation, ventilation, and hemodynamics while addressing the underlying cause. In patients with congestion and adequate perfusion, preload reduction with nitrates and cautious diuretic therapy is appropriate, particularly in acute pulmonary edema. Afterload reduction must be used carefully and avoided in hypotension, acute renal failure, or hyperkalemia. In patients with poor perfusion and hypotension, inotropic support with agents such as dobutamine, dopamine, or milrinone is indicated, with diuretics added after stabilization. Vasodilators should be avoided in shock states. Venous thromboembolism prophylaxis should be considered when appropriate. Pediatric management varies by age and may require prostaglandin infusion in ductal-dependent lesions.
Medications
Common agents include loop diuretics, nitrates, inotropes, vasodilators, angiotensin-converting enzyme inhibitors when appropriate, and adjunctive therapies based on etiology. Medication selection and dosing should be individualized based on hemodynamic status and comorbidities.
Disposition And Follow-Up
Admission to the intensive care unit is required for pulmonary edema, cardiogenic shock, or concomitant ischemia. Medical ward admission is indicated for new-onset heart failure or symptoms refractory to emergency treatment. Discharge may be considered in mild exacerbations that respond well to therapy, provided close follow-up is arranged.
Follow-Up Recommendations
Patients require close outpatient follow-up within one week, education on medication adherence and dietary sodium restriction, monitoring of body weight, and regular assessment of renal function and electrolytes.
Clinical Pearls And Pitfalls
B-type natriuretic peptide is helpful when the diagnosis is uncertain but should not be used in isolation. Early use of noninvasive ventilation can prevent respiratory deterioration. Identifying and treating the precipitating cause of decompensation, such as ischemia, arrhythmia, pulmonary embolism, or valvular disease, is essential to successful management.
Description
Congestive heart failure is a clinical syndrome in which the heart is unable to maintain adequate circulation to meet metabolic demands. It is characterized by chronic debility, episodes of acute decompensation, and high mortality. Acute decompensated heart failure is a rapidly progressive state developing over hours to days and is a common reason for emergency department presentation, often triggered by a precipitating event that exceeds the heart’s compensatory reserve. Chronic heart failure is a progressive condition evolving over months to years, marked by cardiac remodeling and neurohormonal activation. Subtypes include systolic heart failure with impaired contractility and reduced ejection fraction, diastolic heart failure with impaired ventricular relaxation and filling, low-output failure, high-output failure in which cardiac output is normal or increased but insufficient for metabolic needs, left-sided failure with pulmonary congestion, and right-sided failure characterized by hepatic enlargement, jugular venous distention, and dependent edema. Congestive heart failure affects approximately 5.8 million Americans and represents a major cause of hospitalization and healthcare expenditure.
Etiology
Heart failure results from underlying cardiac disease and acute precipitants. Causes include reduced myocardial contractility from ischemia or infarction, cardiomyopathies, myocarditis, and dysrhythmias; reduced contractile efficiency from medications or metabolic disorders; pressure overload from hypertension, valvular disease, congenital heart disease, pulmonary embolism, or pulmonary hypertension; restricted cardiac output due to infiltrative myocardial disease; volume overload from dietary sodium excess, transfusions, intravenous fluids, or sodium-retaining medications; and high-demand states such as hyperthyroidism, pregnancy, anemia, arteriovenous fistula, beriberi, and Paget disease. Pediatric causes vary by age and include congenital shunt lesions in infancy and acquired myocardial dysfunction in older children and adolescents.
Clinical Features
Symptoms reflect poor perfusion and congestion. Poor perfusion manifests as fatigue, somnolence, lightheadedness, palpitations, cool extremities, worsening renal function, and dyspnea. Congestion presents with exertional dyspnea, cough, orthopnea, paroxysmal nocturnal dyspnea, decreased exercise tolerance, elevated jugular venous pressure, dependent edema, rales or wheezing, pleural effusions, third or fourth heart sounds, displaced apical impulse, hepatic enlargement, nausea, and ascites. Acute decompensated heart failure with hemodynamic instability may cause confusion, anxiety, syncope, tachypnea, tachycardia, hypotension, cool or cyanotic extremities, narrow pulse pressure, pulsus alternans, and Cheyne–Stokes respirations.
Essential Diagnostic Evaluation
Chest radiography is central to confirming the diagnosis and assessing severity, although radiographic changes may lag behind symptom onset and persist after clinical improvement. Continuous reassessment is required.
Diagnostic Tests And Interpretation
Laboratory studies include electrolytes and renal function to establish baseline and guide therapy, complete blood count to assess anemia or infection, liver function tests for hepatic congestion or ischemia, thyroid function tests in older patients or those with atrial fibrillation, and cardiac enzymes to evaluate ischemia. B-type natriuretic peptide is useful for differentiating cardiac from pulmonary causes of dyspnea, with high values supporting heart failure and low values making it unlikely, though interpretation must consider age, obesity, and comorbidities. NT-proBNP may also aid diagnosis. Imaging with chest radiography may reveal cardiomegaly, vascular redistribution, interstitial or alveolar edema, pleural effusions, and classic perihilar patterns. Electrocardiography evaluates ischemia, dysrhythmias, hypertrophy, and conduction abnormalities. Echocardiography provides assessment of ejection fraction, ventricular size, valvular pathology, regional wall motion abnormalities, and pericardial disease.
Differential Diagnosis
Left-sided heart failure must be distinguished from acute exacerbations of chronic obstructive pulmonary disease, asthma, pneumonia, acute respiratory distress syndrome, constrictive pericarditis, anemia, malnutrition, pericardial tamponade, and coarctation of the aorta. Right-sided failure may mimic nephrotic syndrome, chronic renal failure, cirrhosis, pulmonary embolism, sleep-disordered breathing, or venous stasis.
Initial Stabilization And Therapy
Management begins with airway assessment, supplemental oxygen, intravenous access, cardiac monitoring, and electrocardiography. Elevating the head of the bed reduces venous return. Noninvasive positive pressure ventilation is often beneficial to reduce work of breathing and improve oxygenation, while intubation is reserved for impending respiratory failure.
Emergency Department Management
Treatment focuses on optimizing oxygenation, ventilation, and hemodynamics while addressing the underlying cause. In patients with congestion and adequate perfusion, preload reduction with nitrates and cautious diuretic therapy is appropriate, particularly in acute pulmonary edema. Afterload reduction must be used carefully and avoided in hypotension, acute renal failure, or hyperkalemia. In patients with poor perfusion and hypotension, inotropic support with agents such as dobutamine, dopamine, or milrinone is indicated, with diuretics added after stabilization. Vasodilators should be avoided in shock states. Venous thromboembolism prophylaxis should be considered when appropriate. Pediatric management varies by age and may require prostaglandin infusion in ductal-dependent lesions.
Medications
Common agents include loop diuretics, nitrates, inotropes, vasodilators, angiotensin-converting enzyme inhibitors when appropriate, and adjunctive therapies based on etiology. Medication selection and dosing should be individualized based on hemodynamic status and comorbidities.
Disposition And Follow-Up
Admission to the intensive care unit is required for pulmonary edema, cardiogenic shock, or concomitant ischemia. Medical ward admission is indicated for new-onset heart failure or symptoms refractory to emergency treatment. Discharge may be considered in mild exacerbations that respond well to therapy, provided close follow-up is arranged.
Follow-Up Recommendations
Patients require close outpatient follow-up within one week, education on medication adherence and dietary sodium restriction, monitoring of body weight, and regular assessment of renal function and electrolytes.
Clinical Pearls And Pitfalls
B-type natriuretic peptide is helpful when the diagnosis is uncertain but should not be used in isolation. Early use of noninvasive ventilation can prevent respiratory deterioration. Identifying and treating the precipitating cause of decompensation, such as ischemia, arrhythmia, pulmonary embolism, or valvular disease, is essential to successful management.
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