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A 22-year-old tall, thin man presents to the emergency department with a sudden onset of right-sided chest pain and shortness of breath. The symptoms started abruptly while he was sitting and studying. He has no significant past medical history, takes no medications, and does not smoke. His temperature is 37.0°C (98.6°F), blood pressure is 120/80 mmHg, heart rate is 112/min, respiratory rate is 22/min, and oxygen saturation is 96% on room air. Physical examination reveals decreased breath sounds and hyperresonance to percussion over the right hemithorax. Arrange the following differential diagnoses in order from highest to lowest pre-test probability based on this patient's clinical presentation.

Emergency medical personnel transport a 55-year-old man to the acute care bay following an episode of voluminous hematemesis at his home. The patient's wife notes he has a long-standing history of alcohol-associated cirrhosis. Upon transfer to the stretcher, the patient is obtunded, pale, and has audible gurgling during inspiration. Vital signs include a temperature of 36.5 C (97.7 F), a blood pressure of 72/42 mm Hg, a heart rate of 144/min, and a respiratory rate of 28/min. Oxygen saturation cannot be reliably obtained due to poor peripheral perfusion.

Arrange the following management steps in the most appropriate chronological sequence for this patient's initial stabilization and triage.

A 65-year-old man presents to the emergency department with the sudden onset of severe, "tearing" chest pain that radiates to his back. He has a 15-year history of poorly controlled hypertension. On physical examination, his blood pressure is 185/110 mmHg in the right arm and 145/90 mmHg in the left arm. His heart rate is 110/min. An electrocardiogram shows sinus tachycardia and voltage criteria for left ventricular hypertrophy, but no acute ST-segment or T-wave changes. When formulating the differential diagnosis for this patient, which of the following life-threatening conditions must be prioritized?

A hospital ethics committee is reviewing several complex cases involving the refusal of recommended medical interventions. Based on current legal and ethical standards, which mandated physician action best corresponds to each clinical presentation?

A 54-year-old woman is brought to the emergency department via ambulance due to sudden-onset difficulty breathing, lightheadedness, and a diffuse rash. Her symptoms began 20 minutes after eating a meal containing shellfish at a local restaurant. En route and upon arrival, she received a total of 2 L of intravenous normal saline and two separate doses of 0.3 mg intramuscular epinephrine, spaced 5 minutes apart. The patient is lethargic but arousable and complains of a "tight throat" and severe nausea. Her medical history is significant for essential hypertension, generalized anxiety disorder, and migraine headaches. Her daily medications include lisinopril, propranolol, and sertraline. Her temperature is 37.0°C (98.6°F), blood pressure is 76/42 mm Hg, pulse is 62/min, and respirations are 26/min. Oxygen saturation is 94% on 4 L/min via nasal cannula. Physical examination reveals diffuse, intensely pruritic erythematous plaques over the trunk and extremities, along with mild facial and lip swelling. Lung auscultation demonstrates diffuse bilateral expiratory wheezing. She is speaking in short phrases without stridor. Which of the following is the most appropriate immediate next step in the stabilization of this patient?

A $72$-year-old man is brought to the emergency department by his daughter due to progressive confusion, frequent falls, and a slow, shuffling gait that has worsened over the past three weeks. His medical history includes hypertension, mild cognitive impairment, and coronary artery disease, for which he takes aspirin and lisinopril. Vital signs are within normal limits. Neurological examination reveals a delayed response to questions, mild left-sided hemiparesis, and a pronator drift in the left arm. A non-contrast head CT is performed. The preliminary interpretation by the radiology resident states 'no acute intracranial hemorrhage; normal age-related volume loss.' However, your careful review of the images reveals unilateral effacement of the cortical sulci over the right cerebral hemisphere, medial displacement of the gray-white matter junction, and a $5$-mm leftward midline shift. The extra-axial space over the right convexity shares the exact same radiodensity (attenuation) as the adjacent cerebral cortex.

Based on your interpretation of these imaging findings, which of the following is the most appropriate next step in patient management?

Match each patient presentation evaluating for suspected coronary artery disease with the most appropriate next step in diagnostic test sequencing.

A 67-year-old retired accountant presents to the pulmonology clinic with an 8-month history of progressively worsening shortness of breath on exertion and a dry, hacking cough. He denies fever, chills, chest pain, or recent travel. He has a 30-pack-year smoking history but quit 15 years ago. He has no history of occupational exposures to dust, mold, or asbestos. On physical examination, his oxygen saturation is 93% on room air. Pulmonary auscultation reveals fine, "Velcro-like" inspiratory crackles at both lung bases. Digital clubbing is present. Pulmonary function testing demonstrates a restrictive pattern with decreased diffusion capacity for carbon monoxide. High-resolution computed tomography (HRCT) of the chest reveals subpleural reticular opacities, traction bronchiectasis, and honeycombing that are most prominent in the lower lobes. To definitively confirm the diagnosis and rule out other interstitial lung diseases, a video-assisted thoracoscopic surgical (VATS) lung biopsy is performed.

Based on the most likely diagnosis, which of the following histopathologic findings are expected to be present on this patient's lung biopsy specimen? (Select two)

A 28-year-old woman, G1P0 at 24 weeks gestation, presents to the emergency department with sudden-onset shortness of breath and right-sided pleuritic chest pain. Vital signs are temperature 37.1°C (98.8°F), heart rate 115/min, blood pressure 110/70 mm Hg, respiratory rate 22/min, and oxygen saturation 94% on room air. Physical examination reveals clear breath sounds bilaterally and normal heart sounds. The lower extremities show no asymmetric swelling or erythema. Electrocardiogram demonstrates sinus tachycardia. The physician suspects a pulmonary embolism. Arrange the following diagnostic imaging studies in the most appropriate sequential order for evaluating this patient, assuming each preceding test is nondiagnostic.

Match the following distinctive radiographic findings with their corresponding underlying rheumatologic or orthopedic diagnosis.

A 74-year-old man is brought to the emergency department from a long-term care facility due to worsening confusion and fever over the past 24 hours. He has a history of benign prostatic hyperplasia and relies on an indwelling Foley catheter.

On arrival, the patient is obtunded. His skin is warm and flushed.

Vital signs are:
Temperature: 39.4°C (102.9°F)
Blood pressure: 74/42 mm Hg
Pulse: 124/min
Respirations: 24/min
Oxygen saturation: 95% on room air.

The urinary catheter bag contains cloudy, dark urine.

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

A 72-year-old man is brought to the emergency department by his family at 08:00 after they found him in bed with dense right-sided hemiplegia and severe global aphasia. He was last known to be neurologically at baseline when he went to sleep at 22:00 the previous night. Initial vital signs reveal a blood pressure of 165/90 mm Hg and a heart rate of 88/min. The acute stroke team is activated to evaluate the patient for potential endovascular reperfusion therapy.

Arrange the following neuroimaging modalities and their corresponding primary interpretive objectives in the correct chronological sequence required to definitively qualify this patient for extended-window mechanical thrombectomy.

A 29-year-old G1P0 woman is evaluated in the emergency department for a one-day history of lower abdominal cramping and mild vaginal spotting. She reports that her last menstrual period was approximately 6 weeks ago. Her medical history is unremarkable, and she takes no medications. Vital signs are within normal limits, including a heart rate of 78/min and a blood pressure of 116/74 mm Hg. Physical examination demonstrates a closed, non-tender cervical os. There is mild right-sided adnexal tenderness, but no palpable masses, guarding, or rebound tenderness are appreciated. A point-of-care urine pregnancy test is positive. Subsequent transvaginal ultrasonography reveals a thickened endometrial stripe measuring $14 \text{ mm}$, no evidence of an intrauterine gestational sac, and normal-appearing ovaries bilaterally with no free fluid in the cul-de-sac. Laboratory testing shows a quantitative serum $\beta$-hCG level of $1,100 \text{ mIU/mL}$. Which of the following is the most appropriate next step in the diagnostic workup?

Cognitive biases are systematic errors in thinking that can significantly impact clinical decision-making and compromise patient safety. Match the following clinical scenarios with the specific cognitive bias that best explains the physician's diagnostic or management error.

A 42-year-old man presents to the primary care clinic for a follow-up visit regarding elevated blood pressure. Over the past three months, his blood pressure measurements have consistently ranged from 145/92 mmHg to 152/96 mmHg despite strict lifestyle modifications. His past medical history is significant for asthma, which is well-controlled with an as-needed albuterol inhaler. The physician decides to initiate pharmacologic antihypertensive therapy. Which of the following medications should be avoided in this patient due to the risk of exacerbating his underlying respiratory condition?

A 48-year-old woman undergoes a percutaneous liver biopsy to evaluate persistently abnormal liver biochemistries. Over the past year, she has experienced worsening fatigue and generalized pruritus. Her medical history is notable only for hypothyroidism managed with levothyroxine. Laboratory evaluation shows an alkaline phosphatase of 410 U/L, aspartate aminotransferase of 55 U/L, and alanine aminotransferase of 62 U/L. Total bilirubin is 1.0 mg/dL. An abdominal ultrasound demonstrates a homogeneous liver echotexture with no intrahepatic or extrahepatic biliary dilatation. The liver biopsy specimen reveals expanded portal tracts with a dense lymphoplasmacytic infiltrate and scattered eosinophils. The inflammatory cells are centered around small interlobular bile ducts, demonstrating epithelial cell swelling, vacuolization, and disruption of the ductal basement membrane. Several poorly formed, noncaseating granulomas are intimately associated with these damaged ducts. The surrounding hepatic lobules are largely preserved. Based on these histopathologic findings, which of the following is the most definitive diagnosis?

A 74-year-old woman is brought to the clinic by her son for a progressive decline in her memory over the past 12 months. The son notes that she frequently repeats questions, forgets recently discussed topics, and recently became disoriented while walking in her own neighborhood. She previously managed her own finances but now struggles to pay bills on time. She has a history of essential hypertension, osteoarthritis, and occasional urinary incontinence over the past 2 years. Her current medications include lisinopril and acetaminophen. Vital signs are Temp 36.8°C (98.2°F), BP 132/82 mmHg, HR 72/min, and RR 14/min. Neurological examination shows normal cranial nerves, normal motor strength and sensation, and a normal, steady gait. She scores 21/30 on the Montreal Cognitive Assessment (MoCA), losing points primarily on delayed recall, orientation, and visuospatial tasks. Which of the following are indicated as the most appropriate concurrent steps in the initial diagnostic workup of this patient? (Select 2)

A 65-year-old man is evaluated in the emergency department for sudden-onset right-sided pleuritic chest pain, dyspnea, and a mild dry cough that began 4 hours ago. He has a history of type 2 diabetes mellitus, hypertension, and chronic kidney disease. His current medications include lisinopril, amlodipine, and insulin glargine.

Vital signs are:
Temperature: 37.2°C (99.0°F)
Pulse: 112/min
Blood pressure: 135/85 mm Hg
Respiratory rate: 24/min
Oxygen saturation: 91% on room air

Physical examination reveals decreased breath sounds and dullness to percussion at the right lung base. Cardiovascular examination reveals tachycardia with a regular rhythm and no murmurs. The lower extremities exhibit trace bilateral pitting edema without localized swelling, erythema, or calf tenderness.

Laboratory studies show a serum creatinine of 2.9 mg/dL (baseline 2.7 mg/dL), with an estimated glomerular filtration rate (eGFR) of $22 \text{ mL/min/1.73 m}^2$.

Chest radiography reveals a moderate right-sided pleural effusion and an area of consolidation in the right lower lobe. An electrocardiogram demonstrates sinus tachycardia. The physician maintains a high clinical suspicion for an acute pulmonary embolism.

Which of the following is the most appropriate next step in imaging?

A 72-year-old man is transferred to the intensive care unit with septic shock secondary to a severe intra-abdominal infection. Blood cultures have been drawn and broad-spectrum antimicrobial therapy has been initiated. However, his mean arterial pressure remains below 65 mmHg, and he exhibits signs of poor tissue perfusion. The clinical team proceeds to manage his hemodynamic instability according to standard sepsis resuscitation guidelines. Arrange the following pharmacologic interventions in the correct sequential order of escalation for the treatment of his persistent hypotension.

A $76$-year-old woman is brought to the emergency department from a skilled nursing facility due to severe, diffuse abdominal pain that began abruptly $4$ hours ago. She has a medical history of paroxysmal atrial fibrillation, heart failure with preserved ejection fraction, and hypertension. Current medications include metoprolol and lisinopril; she stopped taking apixaban three weeks ago due to financial constraints. On examination, the patient is distressed and diaphoretic. Temperature is $37.4^\circ\text{C}$ ($99.3^\circ\text{F}$), blood pressure is $105/65$ mmHg, pulse is $118$/min and irregularly irregular, and respirations are $22$/min. Abdominal examination reveals mild, diffuse tenderness to deep palpation without rebound or guarding, which appears disproportionately mild compared to her reported pain severity. Laboratory studies show a leukocyte count of $16,500/\text{mm}^3$ and a serum lactate level of $5.2$ mmol/L. A contrast-enhanced CT scan of the abdomen and pelvis is performed. The radiologist notes segmental mural hypoenhancement and wall thinning involving the distal jejunum and proximal ileum. Additionally, there are distinct, linear, branching areas of low attenuation (gas density) extending predominantly into the peripheral subcapsular regions of the liver. Which of the following is the most accurate interpretation of the hepatic imaging findings in the context of this patient's presentation?