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A 71-year-old man is evaluated in the cardiac intensive care unit for sudden-onset severe dyspnea and worsening confusion. He was admitted 4 days ago for a late-presenting anterior ST-segment elevation myocardial infarction that was treated with delayed percutaneous coronary intervention. His temperature is $37.1^\circ\text{C}$ ($98.8^\circ\text{F}$), blood pressure is $76/40\text{ mm Hg}$, pulse is $122/\text{min}$, and respirations are $28/\text{min}$. Pulse oximetry shows $84\%$ on room air. Physical examination reveals cold, clammy extremities, distended neck veins, and diffuse bilateral pulmonary crackles. Cardiac auscultation demonstrates a new, loud, harsh holosystolic murmur that is heard best at the left lower sternal border, accompanied by a palpable thrill. Bedside echocardiography confirms a left-to-right intracardiac shunt. Which of the following is the most appropriate definitive management for this patient's current condition?

A 76-year-old woman is brought to the emergency department by her family with a 48-hour history of severe, colicky abdominal pain, intractable nausea, and bilious vomiting. She reports no passage of flatus or stool since the symptoms began. Her medical history includes hypertension and type 2 diabetes mellitus. She has never undergone abdominal surgery.

Her temperature is 38.6°C (101.5°F), blood pressure is 98/60 mm Hg, pulse is 115/min, and respiratory rate is 22/min. Physical examination reveals a distended, tympanic abdomen with high-pitched, hyperactive bowel sounds. There is mild, diffuse abdominal tenderness. Examination of the right groin reveals a 4-cm, firm, erythematous, and exquisitely tender mass located inferior to the inguinal ligament and medial to the femoral artery pulsation.

Laboratory studies demonstrate a leukocyte count of 17,200/mm³ and a serum lactate of 3.4 mmol/L (normal: 0.5-1.0 mmol/L).

Which of the following is the most appropriate next step in the management of this patient?

Match each clinical presentation of a severe adverse drug reaction to the psychotropic medication most likely responsible.

Match each clinical presentation of peripartum complications to the most accurate diagnostic etiology.

A 62-year-old woman is brought to the emergency department due to a 2-day history of right upper quadrant abdominal pain, high fever, and new-onset confusion. Her temperature is $39.2^\circ C$, blood pressure is 88/54 mmHg, and heart rate is 118/min. Physical examination reveals scleral icterus and right upper quadrant tenderness with guarding. Laboratory studies show a leukocyte count of $18,500/mm^3$, total bilirubin of 6.5 mg/dL, and alkaline phosphatase of 450 U/L. Abdominal ultrasound demonstrates cholelithiasis and a dilated common bile duct measuring 12 mm with an obstructing echogenic focus. Arrange the following management steps in the most appropriate chronological sequence for this patient.

An infant, currently $7$ months of age, presents to the emergency room with severe lethargy and tachypnea that began yesterday. The patient's diet was recently transitioned from exclusive breastfeeding to include high-protein solid foods such as meat purees. The mother notes the child can no longer sit up independently, a milestone he had successfully mastered two weeks ago.

Vital signs show a heart rate of $165/\text{min}$ and a respiratory rate of $60/\text{min}$. He is afebrile. Physical examination demonstrates an encephalopathic infant with diffuse muscle weakness, significant head lag, and absent deep tendon reflexes.

Laboratory analysis reveals:
Serum sodium: $139 \text{ mEq/L}$
Serum chloride: $103 \text{ mEq/L}$
Serum bicarbonate: $11 \text{ mEq/L}$
Blood glucose: $48 \text{ mg/dL}$
Serum ammonia: $340 \ \mu\text{mol/L}$ (normal: $15$-$50 \ \mu\text{mol/L}$)
Arterial pH: $7.23$
Arterial pCO2: $24 \text{ mmHg}$

Blood cultures collected two days prior at an urgent care clinic during a mild febrile illness are positive for *Streptococcus pneumoniae*; the preliminary susceptibility report confirms the organism is highly sensitive to penicillin.

Which of the following is the most appropriate next step in the management of this patient?

A 25-year-old man is brought to the emergency department after being involved in a chemical plant fire. The incident occurred exactly 3 hours prior to his arrival. His weight is $70 \text{ kg}$. Primary survey reveals a patent airway, but due to facial burns, he is electively intubated. Physical examination reveals deep partial-thickness and full-thickness burns involving his entire head and neck, his entire anterior trunk, and circumferential burns to both arms. There are no other burn injuries identified. Two large-bore intravenous catheters are placed. According to the traditional Parkland formula ($4 \text{ mL/kg/\% TBSA}$), what should be the initial rate of intravenous crystalloid infusion for the remainder of the first 8-hour post-burn period?

Paramedics bring a 34-year-old woman to the emergency department after she struck a tree at high speed while downhill mountain biking. She was found unresponsive at the scene and underwent field endotracheal intubation. Upon arrival, she is receiving mechanical ventilation. Breath sounds are present and equal bilaterally. Blood pressure is 70/40 mm Hg and heart rate is 135/min. Neurologic examination reveals a right pupil that is 8 mm and nonreactive to light, and a left pupil that is 3 mm and briskly reactive. She does not move her extremities to deep painful stimuli. An extended focused assessment with sonography for trauma (eFAST) reveals a large volume of anechoic fluid in the hepatorenal and splenorenal recesses. There is no evidence of pneumothorax. Pelvic radiography reveals no fractures. Which of the following is the most appropriate next step in the management of this patient?

A $3$-year-old boy is brought to the pediatrician's office during the winter with a $4$-day history of high fever, worsening cough, and rapid breathing. The mother reports that he has been less active than usual but continues to drink fluids well. He has no significant past medical history and is up to date on all immunizations. His temperature is $39.2^{\circ}\text{C}$ ($102.6^{\circ}\text{F}$), pulse is $135\text{/min}$, respirations are $42\text{/min}$, and blood pressure is $94/60\text{ mm Hg}$. Oxygen saturation is $96\%$ on room air. He is alert and interactive. Physical examination reveals focal crackles and decreased breath sounds over the left lower lung field. There are no retractions, diffuse wheezing, or stridor. Which of the following is the most appropriate next step in management?

A 34-year-old man comes to the outpatient clinic requesting assistance with substance use cessation. He has been crushing and snorting prescription oxycodone daily for the past two years and recently transitioned to intravenous heroin use. He states, 'I want to get clean, but the withdrawals are unbearable.' His last opioid use was approximately 16 hours ago. His medical history is significant for a major depressive episode at age 25, for which he was prescribed fluoxetine 20 mg daily, which he continues to take. Upon further psychiatric history, he recalls a distinct three-week period during college when he slept only two hours a night, aggressively day-traded stocks leading to bankruptcy, and felt 'invincible.' He also notes occasional paranoia that undercover police are tracking his phone, but this only occurs when he is actively attempting to purchase illicit drugs. He is employed as a financial analyst and mentions, 'My manager is getting suspicious of my erratic hours, but I haven't told anyone at work about my problem.' Vital signs are temperature 37.1°C (98.8°F), blood pressure 142/88 mmHg, pulse 110/min, and respirations 18/min. Physical examination reveals mydriasis, frequent yawning, rhinorrhea, and prominent piloerection. Which of the following is the most appropriate next step in the management of this patient?

Emergency medical services bring a somnolent 4-year-old girl to the resuscitation bay due to progressive respiratory distress and a high fever lasting 48 hours. Her parents report a severe, harsh cough leading up to her rapid clinical deterioration. She is barely arousable upon arrival. Vital signs reveal a temperature of 39.6°C (103.3°F), a heart rate of 175/min, a respiratory rate of 45/min, and a blood pressure of 70/40 mm Hg. Pulse oximetry shows an oxygen saturation of 88% on ambient air. Physical examination demonstrates cold extremities, mottled skin, and a prolonged capillary refill time of 5 seconds. Lung auscultation reveals dense crackles over the right lower lung field. Arrange the following initial management steps in the most appropriate sequential order according to pediatric resuscitation and sepsis guidelines.

A 10-day-old female infant is brought to the pediatrician's clinic for a follow-up visit. Her state newborn screening test, collected at 48 hours of life, returned positive for an isolated, markedly elevated phenylalanine level. The infant was born at term following an uncomplicated pregnancy and is currently exclusively breastfed. She appears active and healthy, and her physical examination is unremarkable. Arrange the following diagnostic and management steps in the most appropriate chronological order.

A 62-year-old female presents to the physician reporting two episodes of scant, brownish vaginal discharge over the past month. She achieved menopause at age 51. Her past medical history is notable for colon cancer treated with a right hemicolectomy at age 48, and genetic testing at that time confirmed an $MLH1$ gene mutation. She currently takes no daily medications. On pelvic examination, the external genitalia and vagina appear pale with loss of rugae. The cervix is flush with the vaginal vault and appears visually normal. A transvaginal ultrasound is performed in the office, revealing a homogeneous endometrial echo complex measuring $3$ mm in thickness, with normal-appearing bilateral ovaries. Which of the following is the most appropriate next step in management?

Match each clinical presentation or intraoperative finding to the most appropriate eponymous hernia diagnosis.

A 26-year-old male is brought to the emergency department after being struck by a motor vehicle while riding an electric scooter. On arrival, his airway is patent and he is breathing spontaneously. Vital signs are temperature 36.5°C (97.7°F), blood pressure 80/50 mm Hg, pulse 130/min, and respirations 20/min. Physical examination reveals a pale, diaphoretic man who is drowsy but arousable. Breath sounds are clear and equal bilaterally. His abdomen is soft and non-distended, without guarding or rebound tenderness. Gentle anteroposterior compression of the iliac crests reveals abnormal mobility and elicits a groan of pain from the patient. There is a hematoma over the perineum, and blood is visible at the urethral meatus. A focused assessment with sonography for trauma (FAST) examination shows no fluid in the hepatorenal, splenorenal, or rectovesical spaces, and no pericardial effusion. Two large-bore intravenous lines are placed, and fluid resuscitation is initiated. Which of the following is the most appropriate next step in management?

Pharmacotherapy and targeted interventions are mainstays in the management of various pelvic floor disorders, including overactive bladder, urgency urinary incontinence, and neurogenic bladder. Match each pharmacological agent or intervention with its most critical clinical contraindication or adverse effect profile.

A surgical consultation is requested for an 82-year-old female patient admitted earlier today with intractable vomiting and severe abdominal distension. The patient resides in an assisted living facility and has a past medical history significant for atrial fibrillation, type 2 diabetes mellitus, and symptomatic cholelithiasis for which she previously declined operative intervention. Over the past two hours, her abdominal pain has become sharp and constant. Vital signs show a temperature of 38.3°C (100.9°F), pulse of 118/min, and blood pressure of 96/60 mm Hg. Physical examination reveals a markedly distended, tympanic abdomen with focal tenderness and involuntary guarding in the right lower quadrant. Laboratory testing demonstrates a leukocyte count of 15,200/mm³ and a mild non-anion gap metabolic acidosis. A non-contrast computed tomography scan of the abdomen shows branching radiolucencies in the liver, prominent dilation of the jejunum and proximal ileum, and a 3.5-cm radiopaque structure impacted just proximal to the ileocecal valve. Which of the following is the most appropriate next step in the management of this patient?

Following a high-velocity motor vehicle collision, a 28-year-old male is admitted to the trauma resuscitation unit. He was extricated from the driver's seat after a prolonged entrapment. The patient is intubated and mechanically ventilated upon arrival. Initial vital signs demonstrate a blood pressure of 72/38 mm Hg and a heart rate of 144/min. Physical examination of the head reveals a right-sided pupil that measures 8 mm and does not react to light, whereas the left pupil is 3 mm and briskly reactive. The thorax exhibits equal breath sounds bilaterally. The abdomen is markedly distended and firm. Bedside ultrasonography reveals large anechoic spaces in the hepatorenal recess and the splenorenal recess. Which of the following is the most appropriate next step in management?

Pediatric head and neck infections and localized lymphadenopathy have distinct clinical presentations that guide specific management. Match each clinical vignette (left) describing a pediatric patient to the most appropriate management strategy (right).

For each patient scenario involving a potential or confirmed gynecologic malignancy, select the most appropriate evidence-based next step in clinical management.