Emergency medical responders bring a 53-year-old male to the emergency department due to s… — USMLE Step 2 CK

Emergency medical responders bring a $53$ -year-old male to the emergency department due to severe, acute-onset respiratory distress. The patient's spouse reports he has been unable to sleep lying flat for the past two nights and has been coughing frequently. His medical history is significant for poorly controlled hypertension, type $2$ diabetes mellitus, and a $30$ -pack-year smoking history. On arrival, he is sitting on the edge of the stretcher, diaphoretic, and using accessory muscles to breathe. Vital signs include a temperature of $37.1^\circ\text{C}$ ( $98.8^\circ\text{F}$ ), blood pressure of $192/108\text{ mmHg}$ , heart rate of $118/\text{min}$ , and respiratory rate of $30/\text{min}$ . Pulse oximetry shows an oxygen saturation of $84\%$ on room air. Physical examination reveals prominent jugular venous distention measuring $10\text{ cm H}_2\text{O}$ above the sternal angle. Auscultation of the lungs reveals diffuse expiratory wheezes and scattered crackles in the lower two-thirds of both lung fields. A bedside electrocardiogram demonstrates sinus tachycardia with left ventricular hypertrophy but no acute ST-segment changes. Which of the following is the most appropriate initial step in management?

A
Inhaled albuterol and intravenous methylprednisolone
B
Intravenous ceftriaxone and azithromycin
Intravenous furosemide and noninvasive positive-pressure ventilationAnswer
D
Intravenous sodium bicarbonate and high-flow oxygen
E
Computed tomography angiography of the chest

Answer

Intravenous furosemide and noninvasive positive-pressure ventilation

The correct answer addresses both the acute hypoxic respiratory failure and the volume overload defining this patient's acute decompensated heart failure (ADHF). The patient's clinical picture of extreme hypertension, jugular venous distention, orthopnea, crackles, and wheezing represents 'flash' pulmonary edema with cardiac asthma (peribronchial edema). Noninvasive positive-pressure ventilation (NPPV) provides immediate positive end-expiratory pressure, which drives fluid out of the alveoli and significantly reduces both left ventricular preload and afterload. Concurrent administration of an intravenous loop diuretic (like furosemide) provides necessary diuresis to treat the total body volume overload.

Step-by-Step Solution

Analyze the patient's presentation and vital signs.

The patient has acute, severe hypoxia (

84\%

), significant hypertension (

192/108\text{ mmHg}

), orthopnea, jugular venous distention, crackles, and wheezing.

Identifying the primary physiological derangement (respiratory failure with severe hypertension and right-sided pressures) is essential for diagnosis.

Differentiate between primarily pulmonary (e.g., COPD) and cardiac causes of dyspnea with wheezing.

Despite the smoking history and wheezing, the prominent JVD, orthopnea, and severe hypertension confirm acute decompensated heart failure (ADHF) with 'cardiac asthma', rather than a primary COPD exacerbation.

Cardiac asthma occurs when peribronchial edema causes airway narrowing and wheezing; distinguishing this from true bronchospasm prevents therapeutic errors.

Determine the most appropriate initial stabilization step.

The patient requires immediate respiratory support and afterload/preload reduction, best achieved with noninvasive positive-pressure ventilation (NPPV) and an intravenous loop diuretic.

NPPV rapidly improves oxygenation, pushes alveolar fluid into the capillaries, and decreases both preload and afterload. Diuretics remove excess volume.

Key Concept

Patients with acute decompensated heart failure can present with 'cardiac asthma' (wheezing due to peribronchial edema); initial management involves immediate respiratory support with noninvasive positive-pressure ventilation and fluid offloading with loop diuretics.

Estimated Time:1m 0s

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