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Emergency medical services bring a 38-year-old woman to the hospital after her husband noted her to be increasingly lethargic and speaking incoherently over the past 12 hours. The husband reports that she had been complaining of generalized weakness and low-grade fevers for the previous three days. She has no significant past medical history and takes no daily medications. Upon arrival, her temperature is 38.3°C (100.9°F), blood pressure is 142/85 mmHg, pulse is 108/min, and respiratory rate is 18/min. She is somnolent but arouses to verbal stimuli, appearing disoriented to time and place. Physical examination reveals scattered pinpoint red macules that do not blanch on the lower extremities and abdomen. Cardiopulmonary examination is unremarkable, and there is no nuchal rigidity.

Initial laboratory evaluation reveals:

A peripheral blood smear demonstrates marked thrombocytopenia and numerous fragmented red blood cells.

Based on the provided data, which of the following is the most likely diagnosis?

A 68-year-old woman is brought to the emergency department by emergency medical services for severe, sudden-onset shortness of breath that began 45 minutes ago. She has a medical history of hypertension, type 2 diabetes mellitus, and coronary artery disease. Upon arrival, the patient is visibly distressed, diaphoretic, and using accessory muscles of respiration. She is unable to speak in full sentences. Vital signs are temperature 37.0°C (98.6°F), blood pressure 215/115 mmHg, heart rate 118/min, respiratory rate 34/min, and oxygen saturation 81% on room air. Physical examination reveals elevated jugular venous pressure and diffuse bilateral crackles extending to the mid-lung fields. She is expectorating pink, frothy sputum. Which of the following is the most appropriate initial step in the management of this patient?

A 60-year-old male with a 40-pack-year smoking history is undergoing preoperative evaluation for an elective inguinal hernia repair. A routine pre-admission posterior-anterior and lateral chest radiograph incidentally reveals a newly identified, 14-mm, non-calcified, solitary nodule in the right upper lobe. The patient is completely asymptomatic, has no history of malignancy, and his physical examination is unremarkable. According to established clinical guidelines for the evaluation of a solitary pulmonary nodule, arrange the following diagnostic steps in the most appropriate chronological order.

A local health department in an endemic region is evaluating several patients who presented with acute febrile illnesses during the summer months. Match each patient's clinical presentation with the most likely diagnosis.

A $62$-year-old man with a $15$-year history of type 2 diabetes mellitus and hypertension is evaluated during a routine clinic visit. He reports feeling generally well but notes mild fatigue over the past few months. His current medications include metformin and amlodipine. Blood pressure is $135/85 \text{ mm Hg}$ and pulse is $76/\text{min}$. Physical examination reveals decreased sensation to monofilament testing in both feet but no lower extremity edema.

Laboratory studies yield the following results:

Based on the laboratory data provided, which of the following is the most likely cause of this patient's acid-base and electrolyte abnormalities?

A 62-year-old female is evaluated in the inpatient dermatology consultation service for exquisitely painful, violaceous, and necrotic skin lesions on her bilateral thighs and lower abdomen that have rapidly progressed over the past two weeks. She has a history of end-stage renal disease secondary to diabetic nephropathy and receives hemodialysis three times weekly. She also has a history of permanent atrial fibrillation and diet-controlled type 2 diabetes mellitus. Her current medications include calcium acetate, calcitriol, warfarin, and metoprolol succinate. Vital signs are within normal limits. Physical examination reveals retiform purpura with central areas of black eschar and surrounding indurated erythema on the proximal lower extremities and adiposity-rich areas of the abdomen. The lesions are extremely tender to palpation. Peripheral pulses are intact. Laboratory evaluation shows:

Serum calcium: $10.2 \text{ mg/dL}$
Serum phosphorus: $7.8 \text{ mg/dL}$
Intact parathyroid hormone (PTH): $850 \text{ pg/mL}$
International Normalized Ratio (INR): $2.4$

A punch biopsy of the lesion margin demonstrates microvascular calcification, extensive intimal fibroplasia, and cutaneous ischemia without evidence of systemic vasculitis. Which of the following sets of pharmacologic interventions is most appropriate for the management of this patient's dermatologic condition?

A primary care physician is evaluating a 62-year-old man who presents to the ambulatory clinic with a nonhealing ulcer on the plantar surface of his left foot. The patient first noticed the lesion four weeks ago. His medical history is significant for poorly controlled type 2 diabetes mellitus, hypertension, and chronic kidney disease with a baseline serum creatinine of 2.2 mg/dL. His temperature is 37.6°C (99.7°F), blood pressure is 145/88 mm Hg, and pulse is 88/min. Physical examination reveals a 3-cm diameter ulceration under the first metatarsal head. There is surrounding erythema, induration, and a moderate amount of purulent exudate. A sterile blunt probe inserted into the ulcer bed easily contacts hard, gritty tissue. Sensation to a 10-g monofilament is absent globally over both feet. Dorsalis pedis pulses are palpable bilaterally. Which of the following is the most appropriate initial imaging study to order for this patient?

A 64-year-old man is evaluated in the emergency department for the sudden onset of severe, continuous dizziness, nausea, and vomiting that began 2 hours ago. He reports feeling as though the room is spinning and is unable to walk without assistance. His medical history is significant for type 2 diabetes mellitus, hypertension, and hyperlipidemia. His current medications include metformin, lisinopril, and atorvastatin. Vital signs reveal a blood pressure of 168/92 mmHg, a heart rate of 88/min, and a respiratory rate of 16/min. Point-of-care blood glucose is 128 mg/dL. A basic metabolic panel obtained in triage reveals a serum sodium of 134 mEq/L and potassium of 4.1 mEq/L. On physical examination, a targeted bedside vestibular evaluation is performed. When the patient is instructed to fixate his vision on the examiner's nose while his head is rapidly rotated to the left and right, his eyes remain continuously fixed on the target without any corrective saccades. Extraocular movement testing demonstrates nystagmus that beats to the left when looking left, and beats to the right when looking right. Alternate cover testing of the eyes reveals a vertical misalignment. Hearing is intact to finger rub bilaterally. Based on these physical examination findings, which of the following is the most appropriate next step in management?

An otherwise healthy 42-year-old male arrives for a health maintenance visit. During the review of systems, he describes a steady decline in sexual desire and persistent daytime fatigue that has developed over the last eight months. He mentions that spontaneous early morning erections have become rare. He gets at least seven hours of restful sleep each night and denies any recent life stressors, mood changes, or new medication use. Vital signs are normal. Physical examination shows bilateral testicular volumes of 18 mL (normal: 15-25 mL), normal secondary sexual characteristics, and no evidence of gynecomastia. Visual fields are intact. Place the following diagnostic laboratory evaluation steps in the correct sequential order to appropriately work up this patient's suspected condition.

A 58-year-old man presents to the emergency department with a 3-day history of progressively worsening mid-back pain and subjective fevers. Over the past 12 hours, he has noted profound weakness in both legs and an inability to urinate. His medical history is significant for type 2 diabetes mellitus and opioid use disorder, with his last intravenous injection occurring one week ago. His temperature is 38.6°C (101.5°F), blood pressure is 110/70 mmHg, pulse is 108/min, and respiratory rate is 18/min. Physical examination reveals focal tenderness to percussion over the midthoracic spine. Neurologic examination demonstrates 3/5 motor strength in the bilateral lower extremities, decreased pinprick sensation below the umbilicus, and absent patellar and Achilles reflexes. Digital rectal examination reveals markedly diminished anal sphincter tone. Which of the following diagnostic tests are indicated as the most appropriate next steps in this patient's evaluation? (Select all that apply)

During a clinical evaluation, eliciting a detailed travel, occupational, and environmental exposure history is critical for formulating an accurate differential diagnosis. Match each patient's specific exposure history to the most likely infectious disease diagnostic consideration.

A 45-year-old man with a history of traumatic brain injury and alcohol use disorder is brought to the emergency department by emergency medical services due to a continuous seizure. Paramedics report the patient has had uninterrupted generalized tonic-clonic movements for the past 18 minutes. He is unresponsive and exhibits continuous rhythmic motor activity of all four extremities. His blood pressure is 152/94 mmHg, heart rate is 128/min, and oxygen saturation is 95% on a non-rebreather mask. Two large-bore peripheral intravenous lines are successfully established.

Arrange the following pharmacologic interventions in the correct protocolized sequence for escalating the management of status epilepticus, starting with the initial first-line therapy.

A 32-year-old woman is evaluated in the clinic for right lower extremity swelling and pain that began two days ago. Venous Doppler ultrasonography confirms an acute deep vein thrombosis in the right popliteal vein. Her past medical history is significant for a spontaneous abortion at 14 weeks gestation two years ago. She takes no medications and has no family history of bleeding or clotting disorders. Physical examination is unremarkable except for moderate right calf swelling and tenderness.

Laboratory results are as follows:

A $1:1$ mixing study with normal pooled plasma is performed. Immediately after mixing, the patient's aPTT is 58 seconds.

Based on these laboratory findings, which of the following is the most likely diagnosis?

A 47-year-old multiparous woman presents to the emergency department complaining of acute, severe right upper quadrant abdominal pain that radiates to her right scapula. The pain began 6 hours ago after she consumed a large, fatty meal. She also reports nausea, two episodes of emesis, and subjective fever. Her temperature is 38.2°C (100.8°F), blood pressure is 138/85 mmHg, and heart rate is 102/min. Physical examination reveals voluntary guarding and an inspiratory arrest upon deep palpation of the right upper quadrant. Laboratory studies show a leukocyte count of $14,500/mm^3$ with a left shift, but normal serum bilirubin, alkaline phosphatase, and lipase levels.

Arrange the following imaging modalities in the correct evidence-based sequential order for establishing a diagnosis, from the most appropriate initial diagnostic test to the tests utilized for equivocal results or suspected complications.

During a multidisciplinary urology radiology case conference, a physician is tasked with interpreting abdominal computed tomography (CT) scans to determine appropriate patient management. Accurate interpretation of pathognomonic imaging signs is critical for differentiating between conditions that require emergent surgical intervention, targeted embolization, or observation. Match each distinct cross-sectional CT imaging finding on the right with its most likely corresponding renal diagnosis on the left.

Paramedics rush a $19$-year-old college sophomore into the trauma bay following a 911 call from his dormitory roommates. The roommates report that he complained of an excruciating headache and severe nausea earlier in the day before becoming increasingly lethargic. He has no significant past medical history, takes no medications, and his vaccination status is unknown. Upon arrival, the patient is unresponsive to verbal commands and only groans in response to sternal rub (Glasgow Coma Scale score of $8$). A petechial rash is noted on his lower extremities.

Initial vital signs show a temperature of $39.6^\circ\text{C}$ ($103.3^\circ\text{F}$), heart rate of $138\text{/min}$, blood pressure of $82/48\text{ mm Hg}$, respiratory rate of $8\text{/min}$ with shallow effort, and oxygen saturation of $88\%$ on room air.

Arrange the following clinical interventions in the most appropriate sequential order for this patient's initial stabilization and diagnostic workup.

A 45-year-old woman is evaluated in the emergency department for severe, colicky right upper quadrant abdominal pain that radiates to her right scapula, accompanied by nausea. The pain began 6 hours ago after she ate a heavy meal. She is afebrile, and her vital signs are within normal limits. Physical examination reveals tenderness to palpation in the right upper quadrant without rebound or guarding. The Murphy sign is negative. Laboratory evaluation shows:

Total bilirubin: 2.1 mg/dL
Direct bilirubin: 1.5 mg/dL
Alkaline phosphatase: 250 U/L
Aspartate aminotransferase (AST): 110 U/L
Alanine aminotransferase (ALT): 125 U/L
Lipase: 45 U/L
Leukocyte count: 8,500/mm³

A right upper quadrant ultrasound demonstrates cholelithiasis without gallbladder wall thickening or pericholecystic fluid. The common bile duct measures 9 mm in diameter, but no stone is visualized within it. Which of the following is the most appropriate next step in the diagnostic workup of this patient?

A $68$-year-old man presents to the clinic for follow-up of newly diagnosed atrial fibrillation. Three weeks ago, he presented to the emergency department with palpitations and was found to be in paroxysmal non-valvular atrial fibrillation. An echocardiogram demonstrated a structurally normal heart with a left ventricular ejection fraction of $60\%$. He spontaneously converted to normal sinus rhythm and is currently asymptomatic. His past medical history is significant for hypertension, type $2$ diabetes mellitus, and a seizure disorder secondary to a remote traumatic brain injury. His medications include lisinopril, metformin, and phenytoin. He has been seizure-free for the past $4$ years on his current dose of phenytoin. Vital signs are within normal limits. Recent laboratory studies, including a basic metabolic panel and complete blood count, are unremarkable. Liver function tests reveal a mildly elevated total bilirubin of $1.4$ mg/dL (normal: $0.1$-$1.2$ mg/dL) with normal transaminases and alkaline phosphatase. His CHA $_2$ DS $_2$-VASc score is calculated to be $3$. Which of the following is the most appropriate pharmacologic intervention for stroke prevention in this patient?

A 54-year-old man is evaluated in the intensive care unit for new-onset right lower extremity swelling and pain. He was admitted six days ago for an acute right-sided pulmonary embolism and was subsequently started on a continuous unfractionated heparin infusion. His initial recovery was uncomplicated. Today, physical examination reveals a swollen, erythematous, and tender right calf. His vital signs are temperature 37.1°C (98.8°F), blood pressure 128/82 mmHg, and heart rate 88/min.

Recent laboratory studies are as follows:

A lower extremity venous Doppler ultrasound confirms an acute occlusive deep vein thrombosis in the right popliteal vein. Which of the following is the most appropriate next step in the pharmacologic management of this patient?

A 58-year-old man is brought to the emergency department by emergency medical services due to severe, crushing substernal chest pain that began one hour ago while he was resting. The pain radiates to his left jaw and is associated with profound dizziness and diaphoresis. His medical history is significant for hypertension and type 2 diabetes mellitus. On arrival, he appears ashen and lethargic. Vital signs show a temperature of 36.6°C (97.9°F), blood pressure of 74/42 mmHg, heart rate of 112/min, respiratory rate of 20/min, and oxygen saturation of 95% on ambient air. Physical examination demonstrates prominent jugular venous distension, but pulmonary auscultation reveals clear lung fields bilaterally without crackles or wheezes. A rapid 12-lead electrocardiogram demonstrates 3-mm ST-segment elevations in leads II, III, and aVF, with reciprocal ST-segment depressions in leads I and aVL. Which of the following is the most appropriate initial step in the management of this patient?