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Emergency And Acute Medicine – Phimosis
Phimosis is the inability to retract the foreskin (prepuce) over the glans penis. True (pathologic) phimosis results from scarring and fibrosis of the preputial opening, preventing retraction. It is important to distinguish this from physiologic phimosis, which is normal in young children due to natural adhesions between the glans and the inner prepuce. At birth, the foreskin is rarely retractable. Approximately 90% of foreskins are retractable by age 3 years and 99% by age 17, as smegma-producing epithelial cells shed and adhesions separate naturally. Parents should be instructed never to forcibly retract a child’s foreskin, as this may cause trauma and scarring.
True phimosis may develop from trauma due to forcible retraction, recurrent diaper dermatitis, repeated episodes of balanoposthitis (inflammation of the glans and foreskin), poor hygiene, poorly performed circumcision, or congenital anomalies. Chronic inflammation leads to fibrosis and narrowing of the preputial opening.
Patients may present with dysuria, hematuria, poor urinary stream, or ballooning of the foreskin during urination in severe cases. Examination may reveal a whitish, narrowed preputial orifice, along with edema, erythema, and tenderness of the foreskin. Associated balanoposthitis may be present. In extreme cases, obstructive uropathy or vascular compromise of the glans can occur, though these are uncommon.
In most cases, no laboratory or imaging workup is necessary. If severe stenosis causes suspected obstructive uropathy, evaluation of kidney function with BUN and creatinine and renal ultrasonography should be performed. When phimosis occurs secondary to recurrent balanoposthitis, screening for diabetes mellitus with urinalysis, serum glucose, or hemoglobin A1C is appropriate.
The main differential diagnosis is physiologic preputial adhesions in young children, which are normal and do not require intervention. Balanoposthitis without true phimosis should also be considered.
Pre-hospital personnel and caregivers should not attempt to retract the foreskin before medical evaluation, as this may worsen scarring or precipitate the more urgent condition of paraphimosis. Most patients require no immediate stabilization.
If obstructive uropathy is present, bladder decompression with urethral catheterization or suprapubic aspiration may be required. If vascular compromise of the glans occurs, an urgent dorsal slit procedure is necessary after adequate anesthesia, although this situation is rare in phimosis. Topical corticosteroids are often effective and represent first-line therapy. Betamethasone dipropionate 0.05–0.1% applied to the preputial orifice twice daily for 4–6 weeks has a high success rate in reducing phimosis. In pediatric patients requiring foreskin incision, procedural sedation is typically preferred over penile block.
Admission is indicated for obstructive uropathy or severe balanoposthitis with ischemia or necrosis. Patients who can void normally and have reliable urologic follow-up may be discharged. Referral to urology is recommended for evaluation of response to steroid therapy, possible dilation, operative repair, or elective circumcision if needed.
Physiologic phimosis should be managed with reassurance, age-appropriate expectations, and proper hygiene. Forced retraction should be avoided in children, especially between ages 3 and 17, when nonretractability may still be normal. Any signs of vascular compromise of the glans require urgent intervention to prevent necrosis.
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Emergency And Acute Medicine – Pityriasis Rosea
Pityriasis rosea is a self-limited inflammatory skin eruption of unknown origin that primarily affects children and young adults. The condition often begins with a single lesion known as a herald patch, which is an ovoid, erythematous, slightly raised plaque usually located on the trunk or proximal extremities. Within 7–14 days, a secondary eruption develops, consisting of multiple smaller, salmon-colored, elliptic papules with fine scaling. These lesions typically align along Langer lines on the trunk in a symmetric “Christmas tree” distribution. Nearly 80% of cases resolve spontaneously within 1–2 months.
The exact cause is unknown, although weak evidence suggests a viral association, particularly with human herpesvirus types 6 and 7. Several medications have been linked to pityriasis-like eruptions, including barbiturates, captopril, clonidine, gold, isotretinoin, metronidazole, bismuth, interferon, imatinib (Gleevec), and the hepatitis B vaccine. There are weak associations with eczema, asthma, and underlying malignancies.
Many patients report mild prodromal symptoms in the days preceding the rash, including malaise, gastrointestinal upset, or upper respiratory symptoms. On examination, the herald patch is typically 2–10 cm in diameter and seen in 50–90% of cases. The secondary eruption follows, appearing symmetrically along cleavage lines, predominantly on the trunk and proximal extremities. Pruritus is common and may vary in severity. Inverse pityriasis rosea, characterized by lesions on the face and distal extremities with minimal trunk involvement, is more frequently observed in children. Rare pediatric cases may include oral lesions such as punctate hemorrhages or ulcerations.
Diagnosis is clinical and based on characteristic history and physical findings. No routine laboratory testing is required. However, when the herald patch is absent or the presentation is atypical, alternative diagnoses must be considered. Secondary syphilis can mimic the rash and should prompt testing with a rapid plasma reagin (RPR) in patients with risk factors. A potassium hydroxide (KOH) preparation may help distinguish tinea corporis or tinea versicolor.
The differential diagnosis for the herald patch includes nummular eczema and tinea corporis. The secondary eruption may resemble secondary syphilis, drug eruption, guttate psoriasis, lichen planus, seborrheic dermatitis, scabies, dermatomyositis, cutaneous lymphoma, lupus, Kaposi sarcoma, or occult malignancy. Toxic appearance or mucous membrane involvement should prompt reconsideration of the diagnosis.
No stabilization is required in the emergency setting. Pityriasis rosea is self-limiting, and treatment is directed toward symptomatic relief, particularly for pruritus. Topical corticosteroids such as hydrocortisone 1% cream applied three times daily and oral antihistamines such as diphenhydramine may provide relief. In more severe cases, short courses of oral prednisone may be used. Erythromycin has also been reported to reduce symptom duration in some patients.
Hospital admission is not required. Patients with a clear diagnosis may be discharged with reassurance that the condition is benign and typically resolves within 1–2 months. Dermatology referral may be considered for severe, persistent, or atypical cases, especially if pruritus is refractory.
Pityriasis rosea most commonly affects the trunk and proximal extremities. Involvement of mucous membranes, distal extremities, or a toxic clinical appearance should prompt evaluation for alternative diagnoses.
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Emergency And Acute Medicine – Placental Abruption
Placental abruption is hemorrhage at the decidual–placental interface resulting in partial or complete separation of a normally implanted placenta before delivery of the fetus. It occurs in approximately 1% of all pregnancies and accounts for about 30% of bleeding episodes in the second half of pregnancy. It is responsible for 15% of fetal deaths, with neonatal mortality rates of 10–30%, and contributes to approximately 6% of maternal mortality. It is also referred to as abruptio placentae or accidental hemorrhage.
The primary cause is unknown, but the underlying process involves vascular injury with bleeding into the decidua basalis or mechanical shearing between the placenta and uterus, leading to clot formation and placental separation. Severe cases may result in disseminated intravascular coagulation (DIC) and significant maternal–fetal compromise. Many abruptions are thought to arise from chronic inflammatory or ischemic placental disease. Acute abruption may occur following trauma, rapid uterine decompression, or implantation over a uterine anomaly or fibroid.
Risk factors include prior abruption (10–20% recurrence risk), maternal hypertension and preeclampsia, advanced maternal age, increased parity, multiple gestation, uterine fibroids, tobacco use, cocaine abuse, trauma, premature rupture of membranes, oligohydramnios, polyhydramnios with rapid decompression, rapid delivery of the first twin, elevated second-trimester maternal serum alpha-fetoprotein, and thrombophilias. It is more common among African American and Caucasian women, with incidence increasing more rapidly among African American women.
Patients typically present after 20 weeks’ gestation with vaginal bleeding, which is painful in more than 80% of cases. However, bleeding may be absent in 20–25% due to concealed hemorrhage. Abdominal or back pain, uterine tenderness, frequent contractions, uterine tetany, nausea, vomiting, and unexplained preterm labor may occur. A history of trauma or cocaine use should be sought. On examination, uterine tenderness is common, and signs of hypotensive shock may appear late. Fetal distress may manifest as decreased fetal movement, bradycardia, or nonreassuring fetal heart rate tracings. Signs of DIC such as petechiae or bleeding from IV sites may be present. A sterile vaginal examination must be performed cautiously, particularly if placenta previa has not been excluded.
Diagnosis is primarily clinical. Immediate evaluation includes large-bore IV access, blood type and cross-match, rapid hemoglobin assessment, and continuous fetal and uterine monitoring. Laboratory studies include CBC, PT/PTT, fibrinogen level, and fibrin split products. Fibrinogen levels below 200 mg/dL and platelets below 100,000/μL strongly suggest abruption with coagulopathy. Kleihauer–Betke testing is indicated in Rh-negative patients. Ultrasound identifies abruption in only about 50% of cases, and a negative study does not exclude the diagnosis. MRI is sensitive but not practical in acute settings. CT performed for trauma evaluation may incidentally reveal abruption.
The differential diagnosis includes placenta previa, uterine rupture, preterm labor, vaginal or cervical lacerations, ovarian torsion, pyelonephritis, cholecystitis, appendicitis, and other intra-abdominal trauma.
Prehospital management includes transport in the left lateral recumbent position with full resuscitative measures if shock is suspected. Initial stabilization focuses on airway, breathing, and circulation with oxygen, cardiac monitoring, large-bore IV access, and aggressive crystalloid resuscitation. In the emergency department, continuous maternal cardiac and fetal monitoring is required. Blood products including packed red blood cells, fresh frozen plasma, cryoprecipitate, and platelets should be administered as indicated, often via a massive transfusion protocol. Immediate obstetric consultation is mandatory. Foley catheter placement allows close urine output monitoring. Tocolysis is generally contraindicated. In trauma-associated abruption, maternal stabilization takes priority.
Rh-immunoglobulin (300 μg IM at ≥12 weeks’ gestation) should be administered to Rh-negative patients, with dosing adjusted based on Kleihauer–Betke results. Corticosteroids for fetal lung maturity between 24 and 34 weeks and magnesium sulfate may be considered in consultation with obstetrics.
All confirmed or suspected cases require admission for maternal and fetal monitoring. ICU care is indicated for DIC, amniotic fluid embolism, or severe hemorrhage. Stable trauma patients without evidence of abruption after 4–6 hours of normal monitoring may be discharged in consultation with obstetrics, with instructions for pelvic rest and close follow-up.
Placental abruption remains a clinical diagnosis, as no single test reliably confirms or excludes it. Hypotension is often a late finding in pregnant patients with hypovolemia. Early anticipation of consumptive coagulopathy and prompt blood product administration are critical. Severe preeclampsia may mask hypovolemia, resulting in a normotensive but critically ill patient, and should be considered in any severe or unexplained abruption.
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Emergency And Acute Medicine – Placenta Previa
Placenta previa is defined as placental tissue overlying or positioned close to the internal cervical os. As the uterus enlarges and the cervix begins to dilate, placental vessels near the cervix may tear, resulting in vaginal bleeding. More than 90% of placenta previa diagnosed before 20 weeks’ gestation will resolve as the placenta “migrates” upward with uterine growth. However, if the placenta overlaps the internal os by more than 20 mm, previa is highly likely to persist at delivery. Greater degrees of overlap (15–23 mm or more) strongly predict persistence at term. Placenta previa accounts for approximately 20% of antepartum hemorrhage cases.
Placenta previa is classified into four types: complete (placenta completely covers the cervical os), partial (partially covers the os), marginal (placental edge reaches the margin of the os), and low-lying placenta (placental edge lies within 2 cm of the os). The overall incidence at term is approximately 0.4% of pregnancies. Maternal mortality is low (around 0.03%), but perinatal morbidity and mortality are increased—largely due to preterm delivery.
The exact etiology is unknown. Factors affecting implantation location include prior uterine curettage, abnormal endometrial vascularization, and delayed ovulation. Risk factors include multiparity (especially grand multiparity), multiple gestation, prior cesarean section (risk increases with number of previous C-sections), advanced maternal age, prior placenta previa, smoking, assisted reproduction, Asian maternal race, high-altitude residence, male fetus, and elevated maternal serum alpha-fetoprotein. Placenta previa is also associated with congenital anomalies, abnormal fetal presentation, preterm premature rupture of membranes, and amniotic fluid embolism. Placenta accreta spectrum disorders (accreta, increta, percreta) occur in 5–10% of patients with previa and may require cesarean hysterectomy due to severe bleeding.
The hallmark presentation is painless bright red vaginal bleeding after 20 weeks’ gestation. Seventy percent of patients present with painless bleeding, while about 20% may have associated uterine contractions. The first bleeding episode typically occurs between 27 and 32 weeks. Bleeding may range from minor spotting to massive hemorrhage, and recurrence is common. The severity or number of bleeding episodes does not necessarily correlate with the degree of placental coverage. Intercourse or heavy exercise may precipitate bleeding, though often there is no clear inciting event.
On examination, digital vaginal examination must never be performed in second- or third-trimester bleeding until placenta previa has been excluded by ultrasound, as this may precipitate severe hemorrhage. A sterile speculum exam is safe and may help identify whether bleeding originates from the cervical os, vagina, or another lesion. Signs of significant bleeding include blood pooling at the patient’s feet and vital sign instability such as tachycardia or hypotension. Continuous fetal heart rate monitoring is essential.
Diagnosis is made primarily by ultrasound. Transabdominal ultrasound is 93–98% accurate but may have false negatives (e.g., obesity, posterior placenta) and false positives (e.g., overdistended bladder). If placenta previa is suspected or findings are uncertain, transvaginal ultrasound should be performed, as it is essentially 100% accurate and does not increase bleeding risk. Color Doppler ultrasound may help identify placenta accreta. MRI can assist in evaluating invasive placental disorders.
Laboratory evaluation includes CBC, platelets, type and screen (or cross-match if transfusion anticipated), and Rh status. Kleihauer–Betke testing is performed in Rh-negative patients to detect fetomaternal hemorrhage. Coagulation studies are obtained if coagulopathy is suspected.
Prehospital management involves transport to a facility capable of managing high-risk or preterm deliveries. If hypotensive, the patient should be positioned in the left lateral recumbent position. Oxygen and IV access should be established. Initial stabilization includes airway, breathing, and circulation assessment, two large-bore IV lines, crystalloid resuscitation, and blood transfusion as needed. Blood transfusion is indicated for significant hypotension or hematocrit less than 30%. Fresh frozen plasma may be required for coagulopathy. Continuous fetal monitoring and immediate obstetric consultation are mandatory for symptomatic patients.
In the emergency department, patients with active bleeding require emergent obstetric consultation. Maintain NPO status and bed rest until obstetrics determines stability. Rh-negative patients should receive Rho(D) immune globulin (300 μg IM), with additional dosing guided by Kleihauer–Betke results. Magnesium sulfate may be used for preterm contractions when delivery is not indicated. Antenatal corticosteroids (e.g., betamethasone 12 mg IM every 24 hours for two doses) are recommended between 24 and 34 weeks to promote fetal lung maturity. Emergency cesarean delivery is indicated for ongoing hemorrhage or fetal compromise.
All patients with active bleeding from placenta previa should be admitted, as this condition constitutes a potential obstetric emergency. Selected stable patients whose bleeding has resolved may be managed outpatient in consultation with obstetrics. Asymptomatic patients with incidental findings may not require admission but should follow strict instructions, including pelvic rest and prompt reporting of any bleeding or contractions. If the placenta overlies the os by more than 20 mm, cesarean delivery is typically planned at 36–37 weeks.
Painless vaginal bleeding after 20 weeks’ gestation should be considered placenta previa until proven otherwise, whereas painful vaginal bleeding suggests placental abruption. Importantly, both conditions can coexist. Digital vaginal examination must be avoided until previa is excluded, while sterile speculum examination and transvaginal ultrasound are safe and appropriate diagnostic tools.
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Infectious Disease and Microbiology – Botulism
Botulism is a potentially life-threatening neuroparalytic syndrome caused by neurotoxins produced by Clostridium botulinum. Botulinum neurotoxin (BoNT) is among the most potent toxins known. There are five epidemiologic forms of botulism: foodborne, infant botulism, wound botulism, intestinal colonization (adult infectious botulism), and inhalational botulism. Symptoms typically develop 12–36 hours after ingestion of preformed toxin.
Botulism is rare but can occur in small outbreaks, often associated with commercially or home-canned foods. In the United States, most cases occur in infants, approximately one-fourth are foodborne, and a smaller number are related to wounds. Risk factors include improper home canning of low-acid foods such as corn, asparagus, beans, and beets. The fatality rate is higher among patients older than 60 years. Honey ingestion is a well-established risk factor for infant botulism due to gastrointestinal colonization and in situ toxin production. Wound botulism should be suspected in intravenous drug users. Iatrogenic cases have been reported following injection of unlicensed botulinum toxin preparations.
Prevention focuses on proper food preservation techniques. Home-canned foods should be boiled for at least 10 minutes before consumption. Infants under one year of age should not be given honey. Bulging cans should be discarded. Rapid identification of suspected cases is essential to prevent outbreaks.
C. botulinum is an anaerobic, gram-positive, spore-forming rod. It produces toxins classified from types A to G, based on antigenic differences. Human disease is most commonly associated with toxin types A, B, E, and F. Type A is frequently found in the western United States and China, type B in the eastern United States and Europe, and type F worldwide, often linked to fish products. The spores are widely present in soil and marine sediments. While spores are resistant to boiling, they can be destroyed by heating to 120°C. Because of its extreme toxicity, botulinum toxin is considered a potential biological warfare agent.
Clinically, botulism presents with bilateral cranial neuropathies followed by symmetric descending weakness. Patients typically remain afebrile, awake, and alert despite progressive paralysis. Sensory function remains intact. Early manifestations may include diplopia, ptosis, dysarthria, dysphagia, and dry mouth. As paralysis progresses, respiratory failure may occur. Clinical suspicion is critical, as early diagnosis significantly impacts outcomes.
Laboratory confirmation involves detection of toxin in serum, stool, or implicated food samples. The traditional mouse bioassay has limited sensitivity, particularly in wound botulism. However, treatment should not be delayed pending laboratory confirmation when clinical suspicion is high.
The differential diagnosis includes myasthenia gravis, Lambert–Eaton syndrome, tick paralysis, the Miller Fisher variant of Guillain–Barré syndrome, stroke, poliomyelitis, and heavy metal intoxication.
Management is primarily supportive, with close monitoring of respiratory function and mechanical ventilation if required. Equine-derived antitoxin covering toxin types A, B, and E should be administered as early as possible to neutralize circulating toxin. In cases of wound botulism, appropriate antibiotics should be given after antitoxin administration. In infants, intravenous human botulism immune globulin (BIG-IV) is recommended early in the course of illness. Patients often require prolonged rehabilitation. Even after recovery, some individuals may report persistent fatigue, weakness, dizziness, and respiratory difficulty.
Botulism is a potentially life-threatening neuroparalytic syndrome caused by neurotoxins produced by Clostridium botulinum. Botulinum neurotoxin (BoNT) is among the most potent toxins known. There are five epidemiologic forms of botulism: foodborne, infant botulism, wound botulism, intestinal colonization (adult infectious botulism), and inhalational botulism. Symptoms typically develop 12–36 hours after ingestion of preformed toxin.
Botulism is rare but can occur in small outbreaks, often associated with commercially or home-canned foods. In the United States, most cases occur in infants, approximately one-fourth are foodborne, and a smaller number are related to wounds. Risk factors include improper home canning of low-acid foods such as corn, asparagus, beans, and beets. The fatality rate is higher among patients older than 60 years. Honey ingestion is a well-established risk factor for infant botulism due to gastrointestinal colonization and in situ toxin production. Wound botulism should be suspected in intravenous drug users. Iatrogenic cases have been reported following injection of unlicensed botulinum toxin preparations.
Prevention focuses on proper food preservation techniques. Home-canned foods should be boiled for at least 10 minutes before consumption. Infants under one year of age should not be given honey. Bulging cans should be discarded. Rapid identification of suspected cases is essential to prevent outbreaks.
C. botulinum is an anaerobic, gram-positive, spore-forming rod. It produces toxins classified from types A to G, based on antigenic differences. Human disease is most commonly associated with toxin types A, B, E, and F. Type A is frequently found in the western United States and China, type B in the eastern United States and Europe, and type F worldwide, often linked to fish products. The spores are widely present in soil and marine sediments. While spores are resistant to boiling, they can be destroyed by heating to 120°C. Because of its extreme toxicity, botulinum toxin is considered a potential biological warfare agent.
Clinically, botulism presents with bilateral cranial neuropathies followed by symmetric descending weakness. Patients typically remain afebrile, awake, and alert despite progressive paralysis. Sensory function remains intact. Early manifestations may include diplopia, ptosis, dysarthria, dysphagia, and dry mouth. As paralysis progresses, respiratory failure may occur. Clinical suspicion is critical, as early diagnosis significantly impacts outcomes.
Laboratory confirmation involves detection of toxin in serum, stool, or implicated food samples. The traditional mouse bioassay has limited sensitivity, particularly in wound botulism. However, treatment should not be delayed pending laboratory confirmation when clinical suspicion is high.
The differential diagnosis includes myasthenia gravis, Lambert–Eaton syndrome, tick paralysis, the Miller Fisher variant of Guillain–Barré syndrome, stroke, poliomyelitis, and heavy metal intoxication.
Management is primarily supportive, with close monitoring of respiratory function and mechanical ventilation if required. Equine-derived antitoxin covering toxin types A, B, and E should be administered as early as possible to neutralize circulating toxin. In cases of wound botulism, appropriate antibiotics should be given after antitoxin administration. In infants, intravenous human botulism immune globulin (BIG-IV) is recommended early in the course of illness. Patients often require prolonged rehabilitation. Even after recovery, some individuals may report persistent fatigue, weakness, dizziness, and respiratory difficulty.
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Emergency And Acute Medicine – Pneumothorax
Pneumothorax is defined as the presence of free air within the intrapleural space. Spontaneous pneumothorax occurs due to atraumatic rupture of an alveolus, bronchiole, or subpleural bleb. Primary spontaneous pneumothorax accounts for approximately two-thirds of cases and occurs in patients without known underlying lung disease, typically young, tall, thin individuals aged 20–40 years. Risk factors include smoking, family history, Marfan syndrome, homocystinuria, and thoracic endometriosis. Secondary spontaneous pneumothorax occurs in the presence of underlying pulmonary pathology. Tension pneumothorax is a life-threatening form in which air enters the pleural space and becomes trapped through a “ball-valve” mechanism, leading to increased intrapleural pressure, decreased venous return, reduced cardiac output, mediastinal shift, ventilation–perfusion mismatch, and hypoxemia.
Secondary pneumothorax may result from airway diseases such as chronic obstructive pulmonary disease (COPD), asthma, and cystic fibrosis; infections including necrotizing bacterial pneumonia, tuberculosis, fungal pneumonia, and Pneumocystis jirovecii infection; neoplasms; interstitial lung diseases such as sarcoidosis and idiopathic pulmonary fibrosis; lymphangiomyomatosis; tuberous sclerosis; pneumoconioses; connective tissue diseases; pulmonary infarction; endometriosis; blunt or penetrating chest trauma; and iatrogenic causes such as central line placement or other vascular access procedures.
Symptoms typically correlate with the size of the pneumothorax. Patients often present with sudden-onset, sharp, pleuritic chest pain on the affected side and shortness of breath. Some may report a dull ache in delayed presentations. Cough, malaise, or minimal symptoms may occur in small pneumothoraces. On examination, patients may have tachypnea and asymmetric decreased breath sounds with hyperresonance to percussion on the affected side. Simple spontaneous pneumothoraces usually have heart rates under 120 bpm. In tension pneumothorax, findings may include hypotension, tachycardia greater than 120 bpm, diaphoresis, cyanosis, jugular venous distention, tracheal deviation away from the affected side, and cardiovascular collapse.
Imaging is central to diagnosis. However, in hemodynamically unstable patients with strong clinical suspicion of tension pneumothorax, chest decompression must not be delayed for imaging. Upright chest radiography is the standard initial test and demonstrates absence of lung markings beyond a visible visceral pleural line. Additional findings may include mediastinal shift, the deep sulcus sign (particularly in supine trauma patients), inversion of the diaphragm, or displacement of the anterior junction line. Expiratory films do not significantly increase diagnostic yield. Chest CT is highly sensitive for small pneumothoraces but is rarely necessary for routine diagnosis. Point-of-care ultrasound is increasingly used; absence of lung sliding and comet-tail artifacts, along with characteristic M-mode findings, strongly suggests pneumothorax and may be more sensitive than chest radiography in experienced hands. ECG may show nonspecific changes and is often obtained to exclude cardiac causes of chest pain.
Initial stabilization includes cardiac monitoring, pulse oximetry, 100% oxygen via nonrebreather mask, and intravenous access. Unstable patients with suspected tension pneumothorax require immediate needle thoracostomy followed by tube thoracostomy. Needle decompression is performed using a 14–18 gauge angiocatheter in the second intercostal space at the midclavicular line or the fourth or fifth intercostal space at the anterior axillary line. Standard angiocatheters may be too short in larger patients; longer catheters may be required.
Management depends on size and clinical stability. Small primary spontaneous pneumothoraces with less than 15% lung collapse and no respiratory or cardiovascular compromise may be observed with 100% oxygen for 4–6 hours, followed by repeat chest radiography. Simple aspiration using an 8F catheter with a three-way stopcock may be attempted for 15–30% collapse or enlarging small pneumothoraces. Air is aspirated until resistance is met or up to 3 liters have been removed. If imaging confirms resolution, the catheter can be removed and the patient discharged with follow-up. A second aspiration may be attempted if the first fails. A Heimlich valve may be used for persistent but stable pneumothoraces with less than 30% collapse after failed aspiration. Suction at 20 cm H₂O may be applied if necessary.
Tube thoracostomy is indicated for tension pneumothorax, traumatic pneumothorax, pneumothorax in patients requiring positive-pressure ventilation, pneumothorax with greater than 30% collapse, most secondary pneumothoraces, or definitive management after needle decompression. Small-caliber tubes (7–14F) are appropriate for primary spontaneous pneumothorax, whereas larger tubes (20–28F) are used for secondary pneumothorax or when pleural fluid or mechanical ventilation is anticipated. All side holes must remain within the thoracic cavity to prevent air leak. The tube is connected to a water-seal device or Heimlich valve in stable patients without effusion. Complications include intercostal vessel bleeding, tube kinking or clogging, malposition, and re-expansion pulmonary edema, which requires supportive care.
Local anesthesia with 1% lidocaine with epinephrine (maximum 7 mg/kg up to 500 mg) is used for procedures, and procedural sedation may be considered in stable patients. Antibiotics are not indicated for clean procedures.
Admission is required for tension pneumothorax or any patient requiring chest tube placement. Stable patients with small pneumothoraces managed conservatively or with successful aspiration may be discharged with close follow-up at 24 hours and one week, including repeat chest radiographs. Patients must receive clear instructions to return immediately for recurrent chest pain or dyspnea. Persistent failure of lung re-expansion at one week warrants cardiothoracic surgery consultation.
Timely recognition and decompression of tension pneumothorax are critical to prevent rapid hemodynamic compromise. Proper tube placement and awareness of associated injuries, including mediastinal or esophageal pathology when pneumomediastinum is present, are essential to avoid complications.
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Emergency And Acute Medicine – Poisoning, Antidotes
Antidote therapy is used in specific toxicologic emergencies and should be administered in conjunction with supportive care and consultation with a poison control center or medical toxicologist when appropriate.
N-acetylcysteine (NAC) is indicated for acetaminophen overdose. It is most effective when given within the first 8 hours after ingestion. Common adverse effects include unpleasant odor, nausea, and vomiting. Oral dosing consists of 140 mg/kg followed by 70 mg/kg every 4 hours for 17 doses. Intravenous dosing includes 150 mg/kg in 200 mL D5W over 60 minutes, then 50 mg/kg in 500 mL D5W over 4 hours, followed by 100 mg/kg in 1,000 mL D5W over 16 hours. In pediatric patients, IV fluid volumes must be reduced to avoid fluid overload and hyponatremia.
Atropine is used for bradycardia due to drugs and for organophosphate insecticide poisoning. Caution is advised in myasthenia gravis, narrow-angle glaucoma, hypertension, coronary ischemia, and urinary obstruction. Adult dose is 1–2 mg IV. Pediatric dose is 0.02 mg/kg IV (minimum 0.1 mg). Large repeated doses may be required in organophosphate poisoning.
Benztropine (Cogentin) is indicated for acute dystonic reactions. It should be used cautiously in carbamate exposure, myasthenia gravis, narrow-angle glaucoma, hypertension, coronary ischemia, and urinary obstruction. Adult dosing is 1–2 mg IV for acute reactions or orally for prevention. Pediatric dose is 0.02 mg/kg IV or PO.
Benzodiazepines are indicated for agitation, stimulant toxicity, and seizures. Respiratory and CNS depression are potential adverse effects. Midazolam dosing is 1 mg IV or IM every 2–3 minutes as needed in adults, and 0.1 mg/kg IV or IM in children. Diazepam dosing is 2–5 mg IV or IM in adults (repeat in 10–15 minutes) and 0.1 mg/kg IV or IM in pediatrics.
Sodium bicarbonate is used for tricyclic antidepressant poisoning, metabolic acidosis, and urinary alkalinization. Adverse effects include congestive heart failure, excessive alkalosis, and hypokalemia. For serum alkalinization, give 1 mEq/kg IV push. For urine alkalinization, administer 100–150 mEq in 1 L D5W at 2–3 mL/kg/hour IV with a urine pH goal of 7–8.
Black widow spider antivenin (Latrodectus mactans) is indicated for severe hypertension and muscle spasms not relieved by analgesics and muscle relaxants, and may be considered in young children, elderly patients, and pregnant women with threatened abortion. It is equine-derived and may cause immediate hypersensitivity or delayed serum sickness. Dose is 1–2 vials IM or slow IV over 15–30 minutes; dilute one vial in 50 mL saline for IV use.
Botulinum antitoxin (trivalent A, B, E) is indicated in clinical botulism before onset of paralysis. It binds only free toxin and is not used for infant botulism. It is equine-derived with risk of hypersensitivity. Administer 1–2 vials IV every 4 hours for 4–5 doses after reconstitution.
Calcium is indicated for hyperkalemia with cardiac toxicity, hydrofluoric acid burns, calcium channel blocker overdose, and citrate, oxalate, or phosphate poisoning. Avoid in digoxin toxicity and hypercalcemia. Adult dose is 5–10 mL of 10% calcium chloride or 10–20 mL of 10% calcium gluconate IV. Pediatric dose is 0.1–0.2 mL/kg of 10% calcium chloride or 0.2–0.3 mL/kg of 10% calcium gluconate IV.
Calcium EDTA is used for lead and certain heavy metal toxicities. It may cause nephrotoxicity and other adverse effects. Dose is 1 g/m²/day IV over 8–12 hours for 5 days, with repeat cycles guided by blood lead levels.
Cyanide poisoning can be treated with a cyanide antidote kit or hydroxocobalamin. The cyanide kit includes amyl nitrite (inhaled until IV access is established), sodium nitrite (300 mg IV in adults; 0.3 mL/kg of 3% solution in children), and sodium thiosulfate (12.5 g IV in adults; 50 mg/kg in children). Hydroxocobalamin is given as 5 g IV over 15 minutes in adults, repeatable once; suggested pediatric dose is 70 mg/kg IV.
Dantrolene is indicated for malignant hyperthermia, neuroleptic malignant syndrome, serotonin syndrome, and severe muscle rigidity. Dose is 1–2 mg/kg IV bolus, repeated every 10–15 minutes as needed, maximum 10 mg/kg.
Deferoxamine treats iron toxicity. It should not be used for more than 24 hours due to risk of delayed ARDS. Dose is 10–15 mg/kg/hour IV, increased in severe cases.
Digoxin-specific antibody fragments (Digibind) are used in digoxin or digitoxin toxicity. One vial (40 mg) binds 0.6 mg digoxin. Dose estimation is based on serum level and patient weight, with typical dosing of 10–20 vials in acute overdose and 4–6 vials in chronic toxicity.
Dimercaprol (BAL) is indicated for arsenic, gold, mercury, and severe lead toxicity with encephalopathy. Dose is 3 mg/kg IM every 4 hours for 2 days, then every 12 hours for 7 days.
Flumazenil reverses benzodiazepine effects but is contraindicated in tricyclic antidepressant overdose and may precipitate seizures or withdrawal. Adult dose is 0.2 mg IV slow push, repeated every 2–3 minutes up to 1 mg. Pediatric dose is 0.01–0.05 mg/kg IV.
Fomepizole is used for methanol and ethylene glycol toxicity. Dose is 15 mg/kg IV loading, then 10 mg/kg every 12 hours for four doses, then 15 mg/kg every 12 hours thereafter.
Glucagon is used for β-blocker or calcium channel blocker overdose with bradycardia or hypotension. Adult dose is 5–10 mg IV over 1 minute; pediatric dose is 0.15 mg/kg IV.
High-dose insulin with glucose is used in severe calcium channel blocker overdose or hyperkalemia refractory to other therapy. Close glucose monitoring is required.
Naloxone (Narcan) reverses opioid toxicity. Adult dose is 0.4–2 mg IV or IM, repeat up to 10 mg. Pediatric dose is 0.1 mg/kg IV or IM. Acute withdrawal and agitation may occur.
Octreotide treats sulfonylurea-induced hypoglycemia. Adult dose is 50 micrograms subcutaneously every 6 hours. Pediatric dose is 4–5 micrograms/kg/day divided every 6 hours.
Pralidoxime (2-PAM) is used in organophosphate toxicity in conjunction with atropine. Adult dose is 1–2 g IV over 15 minutes, repeat as needed. Pediatric dose is 25–50 mg/kg over 15 minutes.
Protamine reverses heparin anticoagulation. Dose is 1 mg per 100 IU of heparin administered, given slowly IV.
Pyridoxine (vitamin B6) is used for isoniazid-induced seizures. If ingestion amount is unknown, give 5 g IV in adults or 1 g in children.
Vitamin K (phytonadione) reverses warfarin anticoagulation. Dose ranges from 2–10 mg PO or slow IV, repeat as needed based on INR.
Hyperbaric oxygen is indicated for severe carbon monoxide poisoning.
Many antivenins, including those for coral snake and rattlesnake envenomation, are animal-derived and carry risk of hypersensitivity and serum sickness. Premedication and close monitoring are required.
Antidote therapy should always accompany appropriate supportive care, monitoring, and consultation with poison control.
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Emergency And Acute Medicine – Poisoning
Poisoning may be intentional or unintentional. Any patient presenting with an unexplained change in mental status should be evaluated for possible intoxication or overdose. Intentional poisoning may be related to depression, suicide attempts, homicide, or recreational drug abuse. Unintentional poisoning commonly occurs in children and may result from accidental ingestion, therapeutic errors such as double dosing, or recreational experimentation. In pediatric patients, most accidental ingestions occur in children aged 1–5 years. A history that is inconsistent or suspicious should raise concern for possible child abuse.
Clinical presentation varies depending on the substance involved. Neurologic findings may include lethargy, agitation, coma, hallucinations, or seizures. Respiratory effects may range from tachypnea to bradypnea or apnea, with possible inability to protect the airway. Cardiovascular manifestations include dysrhythmias and conduction abnormalities. Vital sign abnormalities may include hyperthermia or hypothermia, tachycardia or bradycardia, and hypertension or hypotension.
Recognition of toxidromes can guide management. Anticholinergic toxicity presents with altered mental status, dry skin and mucous membranes, fixed dilated pupils, tachycardia, hyperthermia, flushing, and urinary retention. Cholinergic toxicity presents with excessive secretions including salivation, lacrimation, urination, diaphoresis, miosis, bronchospasm, and wheezing. Opiate toxicity is characterized by central nervous system and respiratory depression with miosis. Sympathomimetic toxicity presents with CNS excitation, seizures, tachycardia, hypertension, and diaphoresis.
Initial evaluation requires complete vital signs including core temperature and a thorough physical examination, paying attention to pupils, skin findings, and unusual odors. Laboratory testing typically includes electrolytes, BUN, creatinine, and glucose. Calculation of the anion gap (normal 8–12) is essential when metabolic acidosis is suspected. Elevated anion gap metabolic acidosis can be remembered using the mnemonic “A CAT MUD PILES,” which includes causes such as alcoholic ketoacidosis, cyanide, carbon monoxide, salicylates, methanol, uremia, diabetic ketoacidosis, iron, lactic acidosis, and ethylene glycol. Serum osmol gap should be calculated when toxic alcohol ingestion is suspected. The calculated osmolality is 2(Na⁺) + glucose/18 + BUN/2.8 + ethanol/4.6 (if ethanol in mg/dL). An osmol gap greater than 10 suggests substances remembered by the mnemonic “ME DIE A”: methanol, ethanol, diuretics (mannitol, glycerin, sorbitol), isopropyl alcohol, ethylene glycol, and acetone. A normal osmol gap does not completely exclude toxic alcohol ingestion. Additional testing may include pregnancy testing, acetaminophen level in suicidal ingestions, toxicology screening, ECG for conduction abnormalities or QRS/QT prolongation, head CT for unexplained altered mental status, and chest radiograph if aspiration is suspected.
The differential diagnosis for altered mental status includes intracranial mass or hemorrhage, infection or sepsis, endocrine abnormalities, hypothermia, hypoxia, metabolic disturbances, and psychogenic causes. These must always be considered alongside toxicologic causes.
Pre-hospital management includes searching the scene for clues such as pill bottles or drug paraphernalia and transporting all medications for identification. Uncooperative patients may require restraint for safety. Comorbid trauma, medical illness, or environmental exposures should be considered. Activated charcoal may be administered pre-hospital in selected cases if transport time is prolonged.
Initial stabilization in the emergency department follows standard ABC principles. Endotracheal intubation is performed as needed for airway protection, oxygenation, and ventilation. Supplemental oxygen, pulse oximetry, cardiac monitoring, and IV access are established. Hypotension is treated with intravenous 0.9% normal saline boluses and vasopressors if persistent. Bradycardia may require atropine or pacing. In patients with altered mental status, administration of thiamine, dextrose (after checking glucose), and naloxone is appropriate.
Decontamination strategies depend on the timing and substance ingested. Orogastric lavage may be considered within one hour of potentially lethal ingestion without a known antidote, provided the airway is protected. Activated charcoal is most effective within a few hours of ingestion and is contraindicated in caustic ingestions, unprotected airways, or bowel obstruction. Charcoal does not effectively bind metals (iron, lithium), alcohols, or potassium. Whole-bowel irrigation with polyethylene glycol solution may be used for sustained-release preparations, iron or lithium ingestion, and body packers, but is contraindicated in bowel obstruction, perforation, or hypotension.
Enhanced elimination techniques include multiple-dose activated charcoal for drugs such as theophylline, carbamazepine, and phenobarbital. Urinary alkalinization is used for salicylates and phenobarbital. Hemodialysis is indicated for lithium, salicylates, theophylline, toxic alcohols, and valproate in selected cases. Seizures are treated initially with benzodiazepines such as diazepam or lorazepam. Persistent seizures may require phenobarbital. Phenytoin is generally not effective for toxicologic seizures unless related to epilepsy or status epilepticus of other etiology.
Specific antidotes are used when appropriate. Examples include N-acetylcysteine for acetaminophen toxicity, physostigmine for severe anticholinergic toxicity, flumazenil for selected benzodiazepine overdoses, glucagon for β-blocker toxicity, calcium and insulin for calcium-channel blocker overdose, oxygen or hyperbaric oxygen for carbon monoxide, vitamin K for warfarin toxicity, hydroxocobalamin or cyanide antidote kit for cyanide, digoxin-specific antibody fragments for digoxin toxicity, fomepizole or ethanol for methanol and ethylene glycol, deferoxamine for iron, pyridoxine for isoniazid, methylene blue for methemoglobinemia, naloxone for opioid toxicity, atropine and pralidoxime for organophosphates, and sodium bicarbonate for tricyclic antidepressant toxicity.
Admission is required for patients with altered mental status, cardiopulmonary instability, suicidal intent, significant laboratory abnormalities, or risk of delayed decompensation. Discharge may be considered for patients who are psychiatrically cleared, detoxified, hemodynamically stable, and medically safe. Accidental poisonings require prevention counseling, while intentional poisonings require psychiatric evaluation. Substance abuse referral should be considered when appropriate. In pregnancy, treatment of the mother is generally the best treatment for the fetus.
Clinicians must avoid overlooking non-toxicologic causes of altered mental status and should not rely solely on urine drug screens, as these test for a limited number of substances and may produce false-positive or false-negative results.
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Emergency And Acute Medicine – Pneumonia in Pediatric Patients
Pneumonia in children is an infection of the lung parenchyma most commonly resulting from oropharyngeal aspiration, although hematogenous spread may occur. The radiographic distribution often depends on the organism involved: interstitial patterns are typically seen with viral infections and Mycoplasma pneumoniae, lobar consolidation with Streptococcus pneumoniae, abscess formation with Staphylococcus aureus, and diffuse disease with Pneumocystis jirovecii. Clinical presentation and likely pathogens vary significantly with age.
In neonates younger than 2 weeks, common pathogens include group B Streptococcus, enteric gram-negative organisms, respiratory syncytial virus (RSV), herpes simplex virus, and S. aureus. Between 2 weeks and 3 months, pathogens include Chlamydia trachomatis, parainfluenza virus, RSV, S. pneumoniae, S. aureus, Haemophilus influenzae, and Bordetella pertussis. From 3 months to 8 years, viral etiologies predominate (RSV, parainfluenza, influenza, adenovirus), along with S. pneumoniae, H. influenzae in unimmunized children, group A streptococcus, S. aureus, and B. pertussis. In children older than 8 years, Mycoplasma pneumoniae is most common, followed by viral pathogens and S. pneumoniae. Recent immigrants may be at risk for Mycobacterium tuberculosis. Immunocompromised children are susceptible to organisms such as Pneumocystis jirovecii, Mycobacterium avium complex, M. tuberculosis, Klebsiella pneumoniae, and Pseudomonas aeruginosa. Less common causes include fungal infections and rickettsial organisms.
Common symptoms across all pediatric age groups include cough, fever, tachypnea, tachycardia, hypoxia, rales, and signs of respiratory distress such as retractions or grunting. A maculopapular rash may occur in up to 10% of cases. Infants younger than 6 months may present atypically with irritability, lethargy, apnea (especially RSV in premature infants), cyanosis, poor feeding, temperature instability, vomiting with coughing, nasal congestion, nasal flaring, or wheezing. A staccato cough in infants suggests Chlamydia trachomatis. Older children, particularly those over 5 years, are more likely to report pleuritic chest pain, productive cough, rigors, and chills. A thorough history should include immunization status, immune function, exposures, and progression of symptoms.
Pulse oximetry is essential in all suspected cases. Chest radiography remains the gold standard for diagnosis and should be obtained in children with signs of lower respiratory tract infection and in those younger than 36 months with marked leukocytosis (WBC >15,000 or absolute neutrophil count >9,000). Viral and Mycoplasma infections often produce interstitial, perihilar, or peribronchial infiltrates, whereas bacterial infections may demonstrate focal lobar consolidation, alveolar infiltrates, pleural effusion, or pneumatocele. Round pneumonia is considered pathognomonic for S. pneumoniae. Lateral decubitus films can help identify pleural effusions.
Laboratory studies may include a complete blood count, although sensitivity and specificity are limited. Marked leukocytosis (WBC ≥20,000 or ANC >9,000) increases the risk of pneumococcal bacteremia. Bordetella pertussis typically presents with leukocytosis and lymphocytosis. Blood cultures are recommended in children younger than 36 months and in toxic-appearing or hospitalized patients, though yield is low. Arterial blood gas analysis may be necessary in critically ill patients to assess respiratory insufficiency. Electrolytes should be checked in hypotensive children or when syndrome of inappropriate antidiuretic hormone secretion is suspected. Sputum cultures may be obtained in older children, and nasopharyngeal testing can identify RSV, C. trachomatis, and B. pertussis.
Initial management focuses on airway, breathing, and circulation. Children with moderate to severe illness may require aggressive airway management and intubation. High-flow oxygen should be administered for hypoxia. Intravenous fluid resuscitation with 0.9% normal saline (20 mL/kg bolus) is indicated for hypovolemia or shock. Bedside glucose should be checked in severely ill infants and toddlers, with prompt treatment of hypoglycemia. Ongoing monitoring with pulse oximetry is essential.
Empiric antibiotic therapy depends on age and clinical severity. Most well-appearing children aged 6 months and older can be treated as outpatients with oral antibiotics. For children aged 3 months to 5 years, amoxicillin is first-line therapy, with alternatives including amoxicillin–clavulanate or macrolides when atypical pathogens are suspected. For children aged 5 to 18 years, macrolides such as azithromycin or clarithromycin are commonly used for suspected Mycoplasma pneumoniae. Neonates requiring hospitalization should receive ampicillin plus cefotaxime or gentamicin, with azithromycin added if Chlamydia trachomatis or Bordetella pertussis is suspected. Infants 1–2 months old should receive ampicillin plus cefotaxime. Children older than 3 months requiring admission may receive cefotaxime, cefuroxime, or ceftriaxone, with vancomycin added for suspected penicillin-resistant S. pneumoniae, macrolides for atypical pathogens, and clindamycin for suspected group A streptococcal infection. Bronchodilators such as albuterol may be beneficial in children with concurrent reactive airway disease. Thoracentesis is indicated for significant pleural effusion.
Admission is warranted for toxic appearance, respiratory distress or failure, dehydration, apnea, infants younger than 2 months, infants younger than 6 months with lobar pneumonia, hypoxia (oxygen saturation <92% on room air at sea level), pleural effusion, poor outpatient response, immunocompromised status, or concerns about caregiver reliability. most mild cases can be discharged if there is no hypoxia, significant work of breathing, dehydration, vomiting, compliance concern, with follow-up ensured within 1–2 days.< />pan>
Early recognition and aggressive airway management are critical in children with severe sepsis or septic shock. Delays in antibiotic therapy should be avoided. Knowledge of local antimicrobial resistance patterns is essential to guide empiric therapy. Clear discharge instructions, reliable follow-up, and caregiver education are vital to ensure safe outpatient management.
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Emergency And Acute Medicine – Pleural Effusion
Pleural effusion is the abnormal accumulation of fluid within the pleural space. Under normal conditions, the pleural cavity contains approximately 0.1–0.2 mL/kg of clear, low-protein fluid that facilitates lung movement within the thorax. Fluid balance is governed by hydrostatic and oncotic forces, with formation primarily from the parietal pleura and reabsorption through the visceral pleura and lymphatics. Disruption of these forces or lymphatic drainage results in fluid accumulation.
Effusions are classified as transudative or exudative. Transudative effusions are low in protein and cells and result from increased hydrostatic pressure or decreased oncotic pressure without primary pleural disease. Common causes include congestive heart failure, cirrhosis with ascites, nephrotic syndrome, peritoneal dialysis, pulmonary embolism, and hypoalbuminemia. Exudative effusions contain higher protein and cellular content and result from pleural inflammation or impaired lymphatic drainage. Causes include pneumonia, tuberculosis, malignancy, mesothelioma, metastatic disease, pulmonary embolism, pancreatitis, subdiaphragmatic abscess, esophageal rupture, rheumatologic disease, trauma, hemothorax, chylothorax, and certain medications.
Small effusions are often asymptomatic. Larger effusions may cause dyspnea, pleuritic chest pain, cough, tachypnea, and hypoxia. Physical examination may reveal decreased breath sounds, decreased tactile fremitus, dullness to percussion, increased egophony above the fluid level, and occasionally a pleural friction rub. Evaluation should also focus on identifying the underlying cause such as heart failure, infection, or malignancy.
Initial workup includes cardiac monitoring, pulse oximetry, laboratory studies including complete blood count and metabolic panel, and chest imaging. Upright chest radiography typically shows blunting of the costophrenic angle and requires approximately 200–250 mL of fluid for detection. Lateral decubitus films or bedside ultrasound can detect as little as 5–10 mL of fluid and help differentiate free-flowing from loculated effusions. Ultrasound improves safety and reduces pneumothorax risk during thoracentesis. CT of the chest with intravenous contrast is the most sensitive imaging modality and is useful for identifying loculated collections and underlying pulmonary or pleural pathology. Pulmonary embolism should always be considered in cases of unexplained effusion.
Thoracentesis is indicated for new effusions in ill patients or for symptomatic relief of dyspnea due to large effusions. Fluid analysis distinguishes transudative from exudative effusions using Light criteria. An effusion is exudative if one or more of the following are present: pleural fluid protein to serum protein ratio greater than 0.5, pleural fluid LDH to serum LDH ratio greater than 0.6, or pleural fluid LDH greater than two-thirds the upper limit of normal serum LDH. Exudative effusions require further analysis including cell count, Gram stain, culture, cytology, pH, glucose, and other tests guided by clinical suspicion. A pleural fluid hematocrit greater than half of serum hematocrit defines hemothorax. A pH less than 7 or glucose less than 60 mg/dL suggests complicated parapneumonic effusion or empyema.
Therapeutic thoracentesis should avoid removal of more than 1,500 mL to reduce the risk of re-expansion pulmonary edema. Indications for tube thoracostomy include empyema, complicated parapneumonic effusion with low pH or glucose, positive Gram stain or culture, loculated effusion, or hemothorax. Post-procedure chest radiography is recommended to evaluate for pneumothorax.
Emergency management includes airway, breathing, and circulation stabilization with supplemental oxygen and intravenous access. Emergent thoracentesis is required for significant respiratory compromise. Treatment is directed at the underlying cause. Heart failure–related effusions require diuresis. Parapneumonic effusions require antibiotics. Pulmonary embolism requires anticoagulation, and the presence of bloody effusion is not a contraindication. Rheumatologic effusions may respond to anti-inflammatory therapy. Loculated effusions may require intrapleural fibrinolytics or surgical intervention.
Admission is indicated for respiratory compromise, unknown etiology, empyema, suspected parapneumonic effusion, or complications of thoracentesis. Intensive care is required for severe respiratory or hemodynamic instability. Discharge may be considered when the cause is identified, respiratory status is stable, and appropriate follow-up is arranged.
The most common causes of pleural effusion are congestive heart failure, pneumonia, and malignancy. Failure to recognize life-threatening causes such as pulmonary embolism, esophageal rupture, or hemothorax can result in significant morbidity and mortality. Bedside ultrasound is invaluable in diagnosis and procedural guidance and should be used whenever available.
