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Emergency medical services arrive at the hospital with a 45-year-old male who has been expectorating large volumes of blood. Over the past two hours, he has produced nearly $800$ mL of bright red blood filled with clots. His past medical history is significant for pulmonary tuberculosis treated five years ago. On initial evaluation, his blood pressure is $105/65$ mm Hg, heart rate is $118$/min, and respiratory rate is $26$/min. Pulse oximetry shows $88\%$ on room air. The patient appears extremely anxious, and breath sounds are markedly diminished on the right side with coarse crackles. Arrange the following interventions in the most appropriate chronological sequence for managing this patient's life-threatening presentation.

Match each classic cardiac auscultation finding to its most likely underlying valvular pathology.

A 45-year-old man comes to the clinic reporting frequent episodes of severe, pounding headaches accompanied by profuse sweating and a racing heartbeat. He notes that these 'spells' happen unexpectedly and last for 15 to 20 minutes. His blood pressure in the clinic is 185/105 mm Hg, and his pulse is 110/min. Physical examination is otherwise unremarkable. The physician suspects a catecholamine-secreting tumor. Arrange the following steps in the most appropriate chronological sequence for the complete evaluation and management of this patient's condition.

Emergency medical responders transport a 54-year-old male to the emergency department after his neighbor found him unresponsive. The patient has a known history of severe chronic obstructive pulmonary disease and alcohol use disorder. On physical examination, he is obtunded and taking slow, shallow breaths.

Vital signs include:
Temperature: 36.5 °C (97.7 °F)
Blood pressure: 92/58 mmHg
Heart rate: 108/min
Respiratory rate: 8/min

Laboratory studies display the following results:

An arterial blood gas sample on room air shows:

Which of the following best describes this patient's acid-base disturbances?

A 63-year-old man is brought to the emergency department by his family due to progressive confusion, lethargy, and severe right upper quadrant abdominal pain that started $24$ hours ago. He has a history of type 2 diabetes mellitus and asymptomatic cholelithiasis. His temperature is $39.6^\circ\text{C}$ ($103.3^\circ\text{F}$), blood pressure is $82/50\text{ mm Hg}$, pulse is $122/\text{min}$, and respirations are $22/\text{min}$. Physical examination reveals profound scleral icterus and marked tenderness in the right upper quadrant with involuntary guarding. Laboratory results show a leukocyte count of $19,500/\mu\text{L}$, total bilirubin of $6.8\text{ mg/dL}$, direct bilirubin of $5.4\text{ mg/dL}$, and alkaline phosphatase of $520\text{ U/L}$. Abdominal ultrasound reveals a common bile duct dilated to $14\text{ mm}$ with distal shadowing, but no pericholecystic fluid.

Arrange the following management steps in the most appropriate sequential order for this patient.

A 72-year-old man with a history of chronic constipation and Parkinson disease is brought to the emergency department with a 2-day history of progressive abdominal distension, obstipation, and crampy, lower abdominal pain. His temperature is 37.2°C (99.0°F), blood pressure is 135/85 mm Hg, pulse is 98/min, and respiratory rate is 16/min. Physical examination reveals a markedly distended, tympanitic abdomen with mild, diffuse tenderness but no guarding, rigidity, or rebound. Bowel sounds are high-pitched. Laboratory studies show mild leukocytosis (11,500/mm³) and a normal serum lactate level. Arrange the following management steps in the most appropriate chronological sequence for this patient.

A 29-year-old male with a history of intravenous heroin use is brought to the emergency department with a 3-day history of high fevers, severe chills, and progressive shortness of breath. His temperature is $39.2^\circ\text{C}$ ($102.6^\circ\text{F}$), blood pressure is $90/55\text{ mm Hg}$, pulse is $118/\text{min}$, and respiratory rate is $22/\text{min}$. Physical examination reveals a loud holosystolic murmur best heard at the left lower sternal border that increases in intensity with inspiration. Nontender, erythematous macules are noted on the palms and soles. He appears toxic and lethargic. The physician suspects acute right-sided infective endocarditis and initiates the management protocol. Arrange the following management steps in the most appropriate chronological sequence.

Paramedics bring a $72$-year-old woman to the emergency department due to a two-day history of severe, progressively worsening shortness of breath and a dry cough. She reports that her breathing becomes significantly worse when she lies flat, forcing her to sleep upright in a chair. Her medical history includes a previous myocardial infarction, hypertension, and a $30$-pack-year history of smoking, though she quit $15$ years ago. Her temperature is $37.0^\circ\text{C}$ ($98.6^\circ\text{F}$), blood pressure is $168/96\text{ mmHg}$, pulse is $112/\text{min}$, and respirations are $26/\text{min}$. Pulse oximetry shows an oxygen saturation of $89\%$ on ambient air. Physical examination reveals prominent jugular venous distention when seated at a $45$-degree angle. Lung auscultation demonstrates bilateral crackles at the lung bases and scattered expiratory wheezes in all lung fields. Cardiac examination reveals a regular tachycardia and a third heart sound ($S_3$) gallop. Arterial blood gas analysis on ambient air shows:

$pH$: $7.49$
$PaCO_2$: $28\text{ mmHg}$
$PaO_2$: $58\text{ mmHg}$

Which of the following is the most appropriate initial pharmacologic therapy for this patient's respiratory distress?

Match the following cardiovascular pathologies with their most characteristic right and left heart catheterization hemodynamic findings.

A 71-year-old woman is evaluated in the intensive care unit for persistent respiratory distress and hypotension. She was intubated earlier today for severe hypoxemic respiratory failure. Her past medical history includes severe chronic obstructive pulmonary disease ($\text{FEV}_1$ $35\%$ of predicted) and a prior anterior myocardial infarction. Current vital signs show a temperature of $37.1^\circ\text{C}$ ($98.8^\circ\text{F}$), heart rate of $115\text{ /min}$, blood pressure of $86/54\text{ mmHg}$, and oxygen saturation of $94\%$ on mechanical ventilation. Physical examination reveals diffuse bilateral wheezing. A pulmonary artery catheter reveals the following hemodynamic measurements:

* Right atrial pressure: $15\text{ mmHg}$
* Pulmonary artery pressure: $58/32\text{ mmHg}$
* Pulmonary capillary wedge pressure: $28\text{ mmHg}$
* Cardiac index: $1.7\text{ L/min/m}^2$

Based on these findings, which of the following is the most appropriate next step in pharmacological management?

While recovering in the surgical intensive care unit, a 76-year-old male patient develops acute respiratory distress. He underwent an extensive open bowel resection and anastomosis for mesenteric ischemia approximately four hours ago. The surgical log indicates an estimated blood loss of 1,200 mL, for which he was resuscitated with 3 units of packed red blood cells and 4 liters of lactated Ringer solution. The patient is conscious and complains of severe difficulty breathing. Vital signs reveal a temperature of 38.1°C (100.6°F), blood pressure of 175/98 mm Hg, heart rate of 115/min, and a respiratory rate of 28/min. Pulse oximetry displays an oxygen saturation of 85% on room air. Physical assessment is notable for engorged jugular veins and a prominent S3 heart sound. Auscultation of the chest demonstrates bilateral crackles extending to the mid-lung fields. A portable chest radiograph displays cardiomegaly and bilateral hazy alveolar opacities.

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

A 45-year-old man is evaluated in the gastroenterology clinic for severe, recurrent upper abdominal pain and chronic diarrhea. Upper endoscopy performed last week revealed multiple prominent gastric folds and several large ulcers in the distal duodenum and proximal jejunum. The patient's presentation is highly suspicious for a gastrin-secreting neuroendocrine tumor (Zollinger-Ellison syndrome). His proton pump inhibitor therapy has been safely discontinued for an appropriate duration prior to testing. Arrange the following diagnostic steps in the most appropriate chronological order to definitively diagnose and localize this patient's suspected condition.

A $71$-year-old man is evaluated in the intensive care unit (ICU) for management of acute respiratory failure. He was intubated and mechanically ventilated yesterday for a severe chronic obstructive pulmonary disease (COPD) exacerbation triggered by community-acquired pneumonia. His medical history includes COPD, heart failure with reduced ejection fraction (LVEF $30\%$), and chronic kidney disease.

Current ventilator settings (Volume Control):
Fraction of inspired oxygen ($\text{FiO}_2$): $0.40$
Tidal volume: $450\text{ mL}$ ($6\text{ mL/kg}$ predicted body weight)
Respiratory rate: $10\text{/min}$
Positive end-expiratory pressure (PEEP): $5\text{ cm H}_2\text{O}$

Vital signs:
Temperature: $37.8^\circ\text{C}$ ($100.0^\circ\text{F}$)
Blood pressure: $110/70\text{ mm Hg}$
Heart rate: $98\text{/min}$

Physical examination shows coarse breath sounds and prolonged expiration. There is no jugular venous distention. Bedside echocardiography demonstrates a collapsible inferior vena cava with no B-lines.

Arterial blood gas (ABG) on current settings:
pH: $7.25$
$\text{PaCO}_2$: $70\text{ mm Hg}$
$\text{PaO}_2$: $75\text{ mm Hg}$
$\text{HCO}_3^-$: $30\text{ mEq/L}$

The patient's sputum culture from admission has finalized, growing *Streptococcus pneumoniae* susceptible to ceftriaxone. He is currently receiving intravenous vancomycin, piperacillin-tazobactam, and azithromycin.

Concurrently, the patient's estranged son arrives from out of state and demands immediate extubation, stating his father "would not want to live on a machine." The patient's wife, who is his legally designated healthcare proxy, is present and strongly desires to continue full medical support.

Which of the following interventions are appropriate in the management of this patient? (Select all that apply)

An emergency medical team evaluates a 34-year-old female in the emergency department who complains of severe, unrelenting abdominal pain and bilious vomiting for the past 24 hours. The patient underwent an uncomplicated appendectomy 15 years prior. Her temperature is $38.7^\circ\text{C}$ ($101.7^\circ\text{F}$), blood pressure is $88/54\text{ mmHg}$, pulse is $124/\text{min}$, and respiratory rate is $22/\text{min}$. On physical examination, the abdomen is significantly distended and diffusely tender to palpation. Board-like rigidity and rebound tenderness are present across all quadrants. Bowel sounds are absent. Laboratory results demonstrate a leukocyte count of $18,500/\text{mm}^3$ and a serum lactate level of $4.8\text{ mmol/L}$. A supine abdominal radiograph reveals multiple dilated loops of small intestine with prominent air-fluid levels and a paucity of gas in the colon. Which of the following is the most appropriate next step in the management of this patient?

A 19-year-old college student is evaluated in the emergency department for confusion, nausea, and bilateral ringing in her ears. Her roommate reports that the patient ingested a large, unknown quantity of over-the-counter pain-relieving pills earlier in the day following a stressful exam. Temperature is 37.8°C (100.0°F), blood pressure is 112/68 mm Hg, pulse is 115/min, and respirations are 28/min. Physical examination shows a diaphoretic young woman with deep, rapid breathing.

Laboratory studies show:
Serum sodium: 140 mEq/L
Serum chloride: 104 mEq/L
Serum bicarbonate: 14 mEq/L
Blood urea nitrogen: 18 mg/dL
Serum creatinine: 0.9 mg/dL

Arterial blood gas (room air):
pH: 7.45
pCO2: 21 mm Hg
pO2: 98 mm Hg

Which of the following best describes this patient's acid-base status?

On her sixth day of recovery following a pancreaticoduodenectomy (Whipple procedure) for a pancreatic head mass, a 65-year-old woman is urgently assessed by the rapid response team due to altered mental status. She has a right internal jugular central venous catheter that was placed prior to surgery for hemodynamic monitoring and administration of total parenteral nutrition. Over the past four hours, she has become progressively lethargic. Vital signs show a temperature of 39.2°C (102.6°F), blood pressure of 82/50 mmHg, pulse of 124/min, and respiratory rate of 24/min. Physical examination demonstrates marked erythema, induration, and purulent exudate at the insertion site of the central venous catheter. Her surgical abdominal incision is clean and intact without any drainage. Auscultation of the lungs reveals equal breath sounds bilaterally. A urinary catheter is draining clear, yellow urine. Which of the following are the most appropriate next steps in management? (Select all that apply)

A $27$-year-old male is brought to the emergency department $2$ hours after sustaining thermal injuries in an industrial flash fire. He is awake and alert. His airway is intact with no evidence of inhalational injury. Vital signs show a blood pressure of $115/75$ mm Hg, a heart rate of $108/min$, and a respiratory rate of $18/min$. Physical examination reveals deep partial-thickness burns over his entire anterior chest and abdomen, as well as his entire left upper extremity (circumferential). He weighs $80$ kg. Peripheral intravenous access is established.

Using the traditional Parkland formula ($4$ mL/kg/$\%$ total body surface area), what is the appropriate intravenous fluid administration rate (in mL/hr) for the remainder of the first $8$ hours following the injury?

A 68-year-old man comes to the emergency department with worsening shortness of breath over the past 48 hours. He has a 45-pack-year smoking history, type 2 diabetes mellitus, and long-standing hypertension. The patient reports waking up multiple times during the night feeling like he cannot catch his breath. His temperature is 37.0 C (98.6 F), blood pressure is 168/94 mmHg, pulse is 102/min, and respirations are 24/min. Oxygen saturation is 90% on room air. Examination shows distended neck veins while sitting upright. Chest auscultation reveals diffuse wheezing. Cardiac examination demonstrates a rapid rate, regular rhythm, and an extra low-frequency diastolic sound. There is 2+ pitting edema in both lower extremities. Which of the following laboratory tests is most useful to confirm the primary cause of this patient's symptoms?

A 78-year-old female resident of a skilled nursing facility is brought to the outpatient clinic by her daughter for a routine health maintenance visit. The daughter expresses concern because the nursing staff recently noted that the patient's urine has become malodorous and cloudy over the past three days. The patient has a medical history significant for type 2 diabetes mellitus, essential hypertension, and osteoarthritis of the knees. When asked, the patient denies any dysuria, increased urinary frequency, or urgency. She also reports no suprapubic discomfort, flank pain, fever, or chills. Her baseline mental status is alert and oriented to person, place, and time, and the daughter confirms there has been no recent confusion, agitation, or behavioral changes. Vital signs include a temperature of 37.0°C (98.6°F), blood pressure of 132/82 mmHg, heart rate of 76/min, and respiratory rate of 14/min. Physical examination reveals a non-tender abdomen, absent costovertebral angle tenderness, and normal bowel sounds. A point-of-care urinalysis demonstrates positive leukocyte esterase, positive nitrites, and 15-20 white blood cells per high-power field, along with numerous bacteria. Which of the following is the most appropriate next step in management?

A 28-year-old man is evaluated in the outpatient clinic for profound fatigue, an 8-kg (17.6-lb) weight gain, and decreased libido that have worsened over the past six months. One year ago, he sustained a severe traumatic brain injury in a motorcycle collision, which required a three-week stay in the intensive care unit. He is currently taking no medications. Vital signs are within normal limits. Physical examination reveals a flat affect, delayed relaxation of deep tendon reflexes, and sparse axillary and pubic hair. Laboratory studies show:

Which of the following is the most likely underlying mechanism for this patient's thyroid laboratory findings?