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A 42-year-old man presents to the emergency department with a 5-day history of worsening right lower quadrant abdominal pain, chills, and anorexia. His temperature is $38.8^\circ\text{C}$ ($101.8^\circ\text{F}$), blood pressure is $112/74\text{ mmHg}$, and heart rate is $108/\text{min}$. On physical examination, the abdomen is non-distended. There is a palpable, tender mass in the right lower quadrant with localized guarding, but no diffuse rebound tenderness. Laboratory studies show a leukocyte count of $18,000/\text{mm}^3$ with $85\%$ neutrophils. Arrange the following management steps in the most appropriate chronological sequence for this patient.

A 41-year-old woman presents to the clinic to evaluate a newly discovered lump in her neck. She noticed it two weeks ago while adjusting a necklace. She reports no pain, dysphagia, or hoarseness but admits to a recent onset of mild anxiety and intermittent palpitations, which she attributes to stress at work. She has no other medical conditions and takes no medications. Vital signs show a heart rate of $98$/min and blood pressure of $122/78$ mm Hg. Physical examination reveals a palpable, mobile, $2.5$-cm nodule in the right thyroid lobe with no cervical lymphadenopathy. A dedicated neck ultrasound confirms a $2.5$-cm solid, circumscribed nodule in the right thyroid lobe without suspicious sonographic features (e.g., no microcalcifications or irregular margins). Laboratory testing reveals a serum thyroid-stimulating hormone (TSH) level of $0.1$ $\mu$ U/mL (normal: 0.4–4.2 $\mu$ U/mL) and a free thyroxine (T4) level of $1.5$ ng/dL (normal: 0.8–2.7 ng/dL). Which of the following is the most appropriate next step in management?

A 56-year-old man is brought to the emergency department after vomiting a large volume of bright red blood. He has a history of decompensated alcohol-related cirrhosis. On presentation, he is lethargic but arousable. His temperature is 37.1°C (98.8°F), blood pressure is 88/52 mm Hg, pulse is 124/min, and respirations are 20/min. Physical examination reveals scleral icterus, palmar erythema, and a distended abdomen with a positive fluid wave. Arrange the following management steps in the most appropriate sequential order for this patient's acute presentation, from the initial immediate action to the ultimate rescue therapy.

A 62-year-old male with a history of alcohol-associated cirrhosis and chronic obstructive pulmonary disease (COPD) is brought to the emergency department by his wife due to severe weakness, confusion, and worsening shortness of breath over the past 24 hours. She reports that he passed a large volume of black, tarry stool earlier this morning.

On arrival, his temperature is $37.2^\circ\text{C}$ ($99.0^\circ\text{F}$), pulse is $122/\text{min}$, blood pressure is $88/54\text{ mm Hg}$, and respirations are $24/\text{min}$. Oxygen saturation is $94\%$ on room air. Physical examination reveals a lethargic but arousable patient with pale conjunctivae. Chest examination shows decreased breath sounds bilaterally but no crackles or wheezes. The abdomen is distended with shifting dullness. A coarse, flapping tremor is noted upon wrist extension.

Laboratory and diagnostic studies show the following:

A urine culture collected two days ago at an urgent care clinic for mild dysuria has returned positive for >100,000 CFU/mL of *Escherichia coli*. The isolate is sensitive to ceftriaxone, nitrofurantoin, and trimethoprim-sulfamethoxazole.

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

A 52-year-old man is hospitalized to undergo induction chemotherapy for newly diagnosed Burkitt lymphoma. Twenty-four hours after the initiation of the cytotoxic regimen, he reports new-onset muscle cramps, palpitations, and nausea. His temperature is 37.2°C (99.0°F), pulse is 108/min, and blood pressure is 110/70 mm Hg. Physical examination reveals normal heart sounds and clear lungs.

An electrocardiogram (ECG) reveals peaked T waves and a shortened QT interval. The patient is currently receiving aggressive intravenous normal saline and allopurinol. Which of the following is the most appropriate next step in management?

A 45-year-old woman comes to the clinic reporting progressive muscle weakness and recurrent cramping in her legs for the past three weeks. She also notes a several-month history of a sensation of "sand in her eyes" and a dry mouth requiring frequent sips of water. She takes no medications. Vital signs are within normal limits. Physical examination shows 4/5 motor strength in the lower extremities bilaterally with normal deep tendon reflexes.

Laboratory results are as follows:

Which of the following is the primary mechanism responsible for this patient's acid-base disturbance?

A 30-year-old man is brought to the trauma bay after a high-speed motorcycle collision. On arrival, he has active, pulsatile bleeding from a partially amputated right lower extremity. He is moaning, his eyes remain closed, and he exhibits abnormal flexion posturing to painful stimuli. His respiratory rate is 32/min, and oxygen saturation is 84% on room air. Auscultation of the chest reveals absent breath sounds on the right side. Arrange the following initial management steps in the most appropriate chronological order according to current trauma resuscitation protocols.

Match each classic auscultatory finding described below with its corresponding valvular heart disease.

Nursing staff pages the surgical provider on call at 10:00 PM regarding a patient who recently recorded a temperature of $38.4^{\circ}\text{C}$ ($101.1^{\circ}\text{F}$). The patient is a $55$-year-old female recovering from an uncomplicated right hemicolectomy performed for a large, benign tubulovillous adenoma. The operation was completed approximately $28$ hours ago. Her pain is currently managed with a morphine patient-controlled analgesia (PCA) device. She has remained in bed since the surgery due to generalized fatigue and mild incisional pain. She denies nausea, vomiting, cough, dysuria, or shortness of breath. Vital signs show a heart rate of $88\text{ /min}$, blood pressure of $128/82\text{ mm Hg}$, respiratory rate of $16\text{ /min}$, and oxygen saturation of $97\%$ on ambient air. Physical examination demonstrates clear breath sounds bilaterally. The abdomen is non-distended and moderately tender near the midline incision, without guarding or rebound tenderness. The surgical dressing is clean, dry, and intact. Her indwelling urinary catheter, placed in the operating room, is draining clear yellow urine. Which of the following is the most appropriate next step in the management of this patient's elevated temperature?

Match each clinical exposure scenario with the most appropriate first-line oral antimicrobial regimen.

An emergency department physician evaluates a patient presenting with severe, unrelenting mid-back pain that has progressively worsened over the past week. The patient, who has a history of type 2 diabetes mellitus and injection drug use, now reports new-onset bilateral leg weakness and an inability to urinate for the past $6 \text{ hours}$. Vital signs show a temperature of $38.9^\circ\text{C}$ ($102.0^\circ\text{F}$), heart rate of $110/\text{min}$, and blood pressure of $130/80\text{ mmHg}$. Physical examination demonstrates tenderness to percussion over the thoracic spine, $3/5$ motor strength in both lower extremities, and absent deep tendon reflexes at the knees and ankles. A bedside bladder ultrasound reveals a post-void residual volume of $600\text{ mL}$.

Arrange the following management steps in the most appropriate chronological sequence for this patient.

Match the following peripheral blood smear descriptions and associated clinical findings with their most likely underlying diagnosis or pathophysiologic state.

Match each classic clinical presentation of an acute abdomen with its most appropriate initial management step or definitive treatment.

A 38-year-old man is evaluated in the clinic for a 3-month history of episodic, severe headaches, excessive sweating, and palpitations. He reports that these spells occur spontaneously, last 15 to 20 minutes, and leave him feeling exhausted. During a recent episode, he checked his blood pressure at home, and it was 195/110 mm Hg. Today, he is asymptomatic. His temperature is 37.1°C (98.8°F), blood pressure is 142/90 mm Hg, and pulse is 82/min. Physical examination is unremarkable. The physician strongly suspects a catecholamine-secreting tumor.

Arrange the following steps in the most appropriate chronological order for the diagnostic workup and optimal management of this patient.

A 62-year-old man comes to the physician due to a 3-month history of progressive early satiety, postprandial epigastric pain, and an unintentional weight loss of 9 kg (20 lb). His past medical history is significant for a peptic ulcer associated with Helicobacter pylori infection treated 10 years ago. Vital signs are within normal limits. Physical examination reveals conjunctival pallor and mild epigastric tenderness on deep palpation, without rebound or guarding. Laboratory studies show a hemoglobin concentration of 9.2 g/dL and a mean corpuscular volume of 74 fL. Fecal occult blood testing is positive.

Arrange the following diagnostic and management steps in the most appropriate chronological order for this patient's suspected condition. Assume that each successive staging modality demonstrates localized, potentially curable disease without evidence of dissemination.

A 54-year-old woman with a history of metastatic breast cancer is brought to the emergency department due to progressive shortness of breath, generalized weakness, and lightheadedness over the past three days. She reports that she nearly fainted earlier today while walking to the bathroom. Her temperature is 37.1 C (98.8 F), blood pressure is 82/45 mm Hg, pulse is 122/min, and respirations are 24/min. Her systolic blood pressure decreases by 15 mm Hg during inspiration. Physical examination reveals markedly distended jugular veins. The lungs are clear to auscultation bilaterally. Cardiac auscultation demonstrates distant, muffled heart sounds. Which of the following is the most appropriate next step in the management of this patient?

During morning rounds, a physician is urgently called to evaluate a hospitalized patient whose condition has suddenly deteriorated. The patient is a seventy-two-year-old retired teacher who was admitted twenty-four hours ago for an adhesive small bowel obstruction. Her initial management included nothing by mouth, intravenous crystalloid fluids, and nasogastric decompression. Currently, the patient is lethargic and moaning in pain. Vital signs indicate a temperature of $38.9^\circ\text{C}$ ($102.0^\circ\text{F}$), a pulse of $128/\text{min}$, and a blood pressure of $86/48 \text{ mm Hg}$. Compared to her admission examination, her abdomen is now exquisitely tender to light palpation, demonstrating rigid abdominal wall musculature and absent bowel sounds. Recent laboratory studies show a leukocyte count of $18,500/\text{mm}^3$ and a serum lactate level of $6.1 \text{ mmol/L}$. Which of the following is the most appropriate next step in the management of this patient?

A $74$-year-old man is evaluated on the surgical ward for progressively worsening shortness of breath. He underwent an open right hemicolectomy for colon adenocarcinoma $48$ hours ago. The patient has a medical history of diet-controlled type 2 diabetes mellitus, chronic obstructive pulmonary disease, and ischemic cardiomyopathy with a most recent left ventricular ejection fraction of $35\%$. During the operation, he received $3.5$ liters of crystalloid solution. His temperature is $38.1^\circ\text{C}$ ($100.6^\circ\text{F}$), blood pressure is $152/88$ mmHg, pulse is $112$/min, and respiratory rate is $24$/min. Pulse oximetry shows an oxygen saturation of $89\%$ on room air. Physical examination reveals an estimated jugular venous pressure of $10$ cm $\text{H}_2\text{O}$. Chest auscultation reveals bilateral basilar crackles and diffuse expiratory wheezes. The surgical incision is clean, dry, and intact. A portable chest radiograph demonstrates an enlarged cardiac silhouette, prominent central pulmonary vessels, and bilateral patchy alveolar opacities at the bases. Which of the following is the most appropriate next step in management of this patient's respiratory distress?

A 56-year-old man with a history of alcohol use disorder and decompensated cirrhosis is admitted to the hospital with worsening lethargy and diffuse abdominal swelling over the past week. His temperature is $37.2^\circ\text{C}$ ($99.0^\circ\text{F}$), blood pressure is $102/64 \text{ mm Hg}$, pulse is $108/\text{min}$, and respiratory rate is $22/\text{min}$. Physical examination reveals scleral icterus, shifting dullness to percussion, and bilateral pitting edema. Laboratory studies are obtained:

Assuming a normal reference serum albumin of $4.0 \text{ g/dL}$, what is this patient's albumin-corrected serum anion gap?

An occupational health physician evaluates a 28-year-old registered nurse who recently transitioned to working night shifts. She complains of persistent palpitations, a 4-kg (8.8-lb) weight loss over the past month, and severe anxiety. The patient states she has felt immense pressure to maintain a slim physique for an upcoming family event. Her temperature is 37.1°C (98.8°F), blood pressure is 138/78 mm Hg, and resting pulse is 112/min. On physical examination, her skin is warm and moist. Extraocular movements are intact, and there is no lid lag or proptosis. The thyroid gland is nonpalpable and non-tender. A fine tremor is noted when her arms are outstretched.

Initial laboratory testing demonstrates:

What is the most likely explanation for this patient's clinical and laboratory findings?