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A 48-year-old man is evaluated in the primary care clinic after noticing a lump in his lower anterior neck while shaving. He reports a recent onset of increased sweating, frequent bowel movements, and an unintended weight loss of 3 kg (6.6 lbs) over the past two months. Vital signs show a temperature of 37.1°C (98.8°F), blood pressure of 134/86 mm Hg, and heart rate of 104/min. Physical examination reveals a 2.5-cm, firm, mobile, non-tender nodule in the left thyroid lobe. There is no cervical lymphadenopathy. Laboratory testing reveals a serum thyroid-stimulating hormone (TSH) level of 0.05 µU/mL (normal: 0.4–4.0 µU/mL) and a free thyroxine (T4) level of 2.6 ng/dL (normal: 0.8–1.8 ng/dL). A subsequent neck ultrasound confirms a 2.5-cm solid nodule in the left thyroid lobe without any suspicious sonographic features (e.g., no microcalcifications or irregular margins). Which of the following is the most appropriate next step in the diagnostic evaluation of this patient?

A 35-year-old man is brought to the emergency department by emergency medical services due to ongoing generalized shaking of his extremities. The paramedics report that the seizure activity began 20 minutes ago and has been continuous without any periods of responsiveness. His past medical history is significant for a traumatic brain injury two years ago. His blood pressure is 142/88 mmHg, heart rate is 118/min, and oxygen saturation is 95% on a non-rebreather mask. Intravenous access is established, and fingerstick blood glucose is 108 mg/dL (6.0 mmol/L).

Arrange the following pharmacologic interventions in the most appropriate escalating sequence for managing this patient's condition, assuming the seizure activity remains refractory to each preceding step.

Correlate the following distinct central nervous system imaging findings with their most likely underlying clinical diagnosis.

A $28$-year-old primigravida at $34$ weeks gestation presents to the obstetrical triage unit complaining of a severe, unrelenting headache, visual scotomas, and right upper quadrant abdominal pain. Her blood pressure is $175/115$ mmHg. Physical examination reveals right upper quadrant tenderness and $3+$ pitting edema of the lower extremities. Laboratory studies show:

A peripheral blood smear demonstrates numerous schistocytes. The medical team is formulating a differential diagnosis that includes HELLP (hemolysis, elevated liver enzymes, low platelets) syndrome, thrombotic thrombocytopenic purpura (TTP), and disseminated intravascular coagulation (DIC). Which of the following laboratory findings would most definitively indicate the presence of disseminated intravascular coagulation (DIC) rather than uncomplicated HELLP syndrome or thrombotic thrombocytopenic purpura (TTP)?

A 45-year-old woman is evaluated in the clinic for follow-up of difficult-to-control hypertension. Her blood pressure today is 168/102 mmHg despite documented adherence to maximal doses of amlodipine, lisinopril, and hydrochlorothiazide. She reports occasional muscle weakness but is otherwise asymptomatic. Fundoscopy shows no papilledema, and her neurological examination is normal. Laboratory studies reveal a serum potassium of 3.1 mEq/L and a serum sodium of 142 mEq/L. The physician suspects a specific secondary cause of her hypertension. Arrange the following diagnostic steps in the correct sequential order from initial screening to definitive pre-surgical evaluation.

A 54-year-old woman is evaluated in the clinic following a recent emergency department visit for right-sided flank pain. During her acute presentation, a noncontrast computed tomography (CT) scan of the abdomen and pelvis confirmed a 3-mm right ureteral calculus, which she has since passed spontaneously. However, the radiologist's report notes an incidental 3.5-cm solid, well-circumscribed mass in the left adrenal gland. The mass is homogeneous and has an attenuation value of 5 Hounsfield units (HU). The patient has no significant past medical history and takes no medications. She feels well and reports no headaches, palpitations, weakness, or diaphoresis. Her blood pressure is 120/78 mm Hg, and her pulse is 72/min. Physical examination is unremarkable.

Based on the interpretation of the imaging results, which of the following best describes the nature of this finding and the most appropriate next step in management?

A 62-year-old woman presents to the preoperative clinic for evaluation ahead of an elective right hemicolectomy scheduled in seven days. The surgery is indicated for a large, flat cecal adenoma that was unamenable to endoscopic resection. Her medical history includes a mechanical mitral valve replacement performed five years ago, type 2 diabetes mellitus, hypertension, and stage 3 chronic kidney disease. She leads an active lifestyle and reports walking at least two miles daily without experiencing chest pain, shortness of breath, or fatigue. Current medications include warfarin, metformin, and lisinopril. Vital signs are within normal limits. Laboratory studies reveal a serum creatinine of 1.5 mg/dL, an INR of 2.8, and an HbA1c of 7.1%. Which of the following procedural and perioperative management steps are indicated for this patient? (Select all that apply)

A 58-year-old woman is brought to the emergency department by her family due to progressively worsening shortness of breath, inability to lie flat, and generalized weakness over the past three days. She has a history of ischemic cardiomyopathy with a left ventricular ejection fraction of 25%. Her home medications include sacubitril-valsartan, carvedilol, spironolactone, and dapagliflozin. Temperature is 36.8°C (98.2°F), blood pressure is 86/56 mmHg, pulse is 112/min, and respiratory rate is 24/min. Oxygen saturation is 88% on room air. The patient appears lethargic. Extremities are cool to the touch with faint peripheral pulses and 2+ pitting edema up to the knees. Jugular venous pulsation is visible at the angle of the mandible while sitting upright. Chest auscultation reveals diffuse bilateral crackles extending to the mid-lung fields. Laboratory studies show:

An electrocardiogram shows sinus tachycardia with a left bundle branch block, unchanged from prior tracings. Which of the following is the most appropriate initial pharmacologic intervention for this patient?

A 65-year-old man with a history of type 2 diabetes mellitus and peripheral neuropathy is brought to the emergency department due to rapidly worsening right leg pain, swelling, and fever over the past 12 hours. The patient reports the pain is excruciating and much worse than the visible skin changes would suggest. He is confused and lethargic. Vital signs are temperature $39.4^\circ\text{C}$ ($102.9^\circ\text{F}$), blood pressure $82/50\text{ mmHg}$, heart rate $128/\text{min}$, and respiratory rate $24/\text{min}$. Physical examination reveals a swollen, tense right lower extremity with poorly demarcated erythema advancing proximally toward the knee. Several violaceous bullae are present on the calf, and palpable crepitus is noted over the anterior tibia. Laboratory results show a leukocyte count of $24,000/\text{mm}^3$, serum sodium of $130\text{ mEq/L}$, and serum creatinine of $1.9\text{ mg/dL}$. Vigorous intravenous fluid resuscitation is initiated. Which of the following is the most appropriate next step in management?

A 26-year-old man is brought to the emergency department via ambulance after being ejected from a motorcycle at highway speeds. He was not wearing a helmet. On arrival, the patient is unresponsive with a Glasgow Coma Scale score of 6. He has massive midface crush injuries with active, brisk hemorrhage into the oropharynx. He is making gurgling respiratory sounds with poor chest rise. Vital signs are temperature $36.1^\circ\text{C}$ ($97.0^\circ\text{F}$), blood pressure 78/48 mm Hg, heart rate 135/min, and respiratory rate 8/min. Oxygen saturation is 84% on room air. The bilateral radial pulses are weak and thready. An attempt at bag-valve-mask ventilation is unsuccessful due to severe facial deformity and continuous bleeding.

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

A 58-year-old man is brought to the emergency department by his husband due to increasing confusion and lethargy over the past 24 hours. For the last 5 days, he has experienced high, spiking fevers, severe myalgias, and a frontal headache. He has a history of hypertension and hyperlipidemia. He lives in coastal Massachusetts and spent the previous weekend clearing heavy brush in a densely wooded area behind his property.

Temperature is 39.2°C (102.6°F), blood pressure is 105/65 mm Hg, heart rate is 112/min, and respirations are 20/min. Physical examination reveals scleral icterus and a palpably enlarged, tender spleen. There is no rash, eschar, or joint swelling.

Laboratory studies show:

The initial triage provider suspects human granulocytic anaplasmosis based on the leukopenia and thrombocytopenia, and recommends starting empiric doxycycline. However, the attending physician notes specific hematologic abnormalities that must alter the primary differential diagnosis. Which of the following conditions is the most likely cause of this patient's presentation?

A 48-year-old man is brought to the emergency department by emergency medical services after being found wandering near a bus station. He is agitated, diaphoretic, and yelling at unseen individuals. He has a known history of severe alcohol use disorder and has been hospitalized multiple times for intoxication. Vital signs show a heart rate of 122/min, blood pressure of 168/100 mm Hg, respiratory rate of 20/min, and oxygen saturation of 97% on room air. Fingerstick blood glucose is 82 mg/dL. Physical examination reveals coarse, bilateral hand tremors, bilateral horizontal nystagmus, and a broad-based, unsteady gait. He is disoriented to place and time. Which of the following pharmacologic interventions are appropriate in the immediate management of this patient? (Select all that apply)

An unresponsive 68-year-old man with a known history of severe chronic obstructive pulmonary disease is rushed to the resuscitation bay by his family. His wife reports that his breathing became progressively more labored over the previous 6 hours before he became unarousable at home. Currently, the patient only groans and minimally withdraws in response to a sternal rub. His temperature is 37.2°C (99.0°F), blood pressure is 145/88 mmHg, pulse is 118/min, and respiratory rate is 30/min. Pulse oximetry reveals an oxygen saturation of 81% on room air. The physical examination is notable for shallow, rapid respirations with marked intercostal retractions and poor bilateral air movement. Which of the following is the most appropriate initial step in this patient's management?

A 58-year-old man is evaluated in the intensive care unit for new-onset severe abdominal pain. He was admitted 6 hours ago after presenting with sudden, tearing interscapular pain. At the time of admission, computed tomography angiography revealed a Stanford Type B aortic dissection originating just distal to the left subclavian artery and extending to the aortic bifurcation. He was appropriately managed with intravenous esmolol and nicardipine infusions, which reduced his heart rate to 62/min and blood pressure to 112/68 mmHg, resulting in the resolution of his back pain. Currently, he reports diffuse, constant abdominal pain that is out of proportion to the physical examination findings. The abdomen is soft and non-distended, with no rebound tenderness or guarding. His current blood pressure is 115/70 mmHg, and heart rate is 64/min. Laboratory studies show a serum lactic acid level of 5.2 mmol/L, up from 1.1 mmol/L on admission. Which of the following is the most appropriate next step in management?

Emergency medical services transport a 68-year-old female to the resuscitation bay due to sudden-onset, crushing substernal chest discomfort and severe shortness of breath that awoke her from sleep 45 minutes prior. Her past medical history includes type 2 diabetes mellitus, hypertension, and a 40-pack-year smoking history. Initial vital signs obtained by the triage nursing staff show a temperature of 36.8°C (98.2°F), a heart rate of 122/min, a blood pressure of 78/50 mmHg, and a respiratory rate of 34/min. Pulse oximetry indicates an oxygen saturation of 80% on room air. On physical examination, the patient is diaphoretic, agitated, and communicating only in one-to-two word phrases due to severe respiratory distress. Prominent jugular venous distention is noted. Pulmonary auscultation reveals diffuse, coarse crackles throughout all lung fields bilaterally. Cardiac auscultation reveals a regular tachycardia and an audible S3 gallop, without murmurs. An immediate 12-lead electrocardiogram obtained upon arrival shows 4-mm ST-segment elevations in leads V1 through V6 with reciprocal changes in the inferior leads. Two large-bore intravenous lines are established. Which of the following represents the single most urgent priority in the initial stabilization of this patient?

A 27-year-old woman presents to the outpatient clinic for a routine health maintenance examination. She has felt well overall but mentions experiencing occasional, dull, throbbing headaches over the past few months. She has no significant past medical history. Her only medication is a combined oral contraceptive pill, which she has taken for three years. She does not use tobacco, alcohol, or illicit drugs. Her family history is notable for a father with type 2 diabetes mellitus; there is no family history of early-onset cardiovascular disease.

Vital signs show a blood pressure of 172/105 mm Hg in the right arm and 168/104 mm Hg in the left arm. Her pulse is 76/min, and respiratory rate is 14/min. Her body mass index is 21 kg/m². On physical examination, the lungs are clear to auscultation, and the heart has a regular rate and rhythm without murmurs. Auscultation of the abdomen reveals a soft, high-pitched, continuous bruit in the right periumbilical region. There is no peripheral edema.

Laboratory studies are notable for:
- Sodium: 141 mEq/L
- Potassium: 3.1 mEq/L
- Chloride: 102 mEq/L
- Bicarbonate: 29 mEq/L
- Blood urea nitrogen: 12 mg/dL
- Creatinine: 0.8 mg/dL

Which of the following is the most likely diagnosis?

Pulmonary embolism (PE) is a potentially life-threatening condition, but its diagnostic workup must be tailored to patient stability, pre-test probability, and comorbidities to avoid unnecessary risk. Match each patient presentation with the most appropriate guideline-indicated next diagnostic step in their evaluation.

A 64-year-old man presents to the clinic for an initial visit to establish primary care. He has a history of chronic obstructive pulmonary disease and a 40 pack-year smoking history. Two weeks ago, he was evaluated at an urgent care center for an exacerbation of his chronic cough, which was successfully treated with a short course of oral corticosteroids. A chest radiograph performed during that visit revealed a 14-millimeter, noncalcified, peripheral nodule in the right upper lobe. Medical records indicate that a previous chest radiograph obtained four years ago showed no evidence of this nodule. The patient currently feels well and reports his cough has returned to baseline. Vital signs are within normal limits. Physical examination reveals distant breath sounds and mild end-expiratory wheezing, but is otherwise unremarkable.

Which of the following is the most appropriate next step in the diagnostic evaluation of this patient's lung nodule?

A 68-year-old woman is brought to the emergency department by emergency medical services at 07:30 due to sudden neurological deficits. Her husband reports that they went to bed at 22:00 the previous night, at which time she was at her baseline. Upon waking at 07:00, she was found to have dense right-sided weakness and severe difficulty speaking. On examination, her blood pressure is 165/90 mmHg, heart rate is 88/min, and oxygen saturation is 98% on room air. Neurologic examination reveals right-sided hemiplegia, a right facial droop, and expressive aphasia. The clinical team activates the acute stroke protocol for a suspected 'wake-up' ischemic stroke. Arrange the following imaging modalities and confirmatory protocols in the most appropriate sequential order for the diagnostic workup and management of this patient, from first to last.

A $65$-year-old man presents to the urgent care clinic with a $1$-day history of excruciating pain in his right big toe. The pain awoke him from sleep and is so severe that he cannot tolerate the weight of his bedsheets. His medical history is significant for ischemic cardiomyopathy with a left ventricular ejection fraction of $25\%$, chronic kidney disease stage 4, type 2 diabetes mellitus, and hyperlipidemia. His current medications include carvedilol, sacubitril-valsartan, empagliflozin, furosemide, and atorvastatin. Vital signs show a blood pressure of $118/76$ mm Hg, heart rate of $72$/min, and temperature of $37.1^\circ$ C. Physical examination reveals a markedly erythematous, swollen, and exquisitely tender right first metatarsophalangeal joint. The remainder of the joint examination is unremarkable. Laboratory studies from one week ago showed a serum creatinine of $2.6$ mg/dL (estimated glomerular filtration rate $24$ mL/min/$1.73$ m $^2$) and a hemoglobin A1c of $7.8\%$. Joint aspiration is deferred as the clinical presentation is highly classic for podagra. Which of the following is the most appropriate initial pharmacologic therapy for this patient's acute joint condition?