A 65-year-old man presents to the emergency department with a 24-hour history of progressi… — USMLE Step 2 CK

A 65-year-old man presents to the emergency department with a 24-hour history of progressively worsening shortness of breath and a cough productive of clear sputum. His past medical history is significant for an ischemic cardiomyopathy with a left ventricular ejection fraction of $35\%$ , as well as severe chronic obstructive pulmonary disease. His temperature is $37.2^\circ\text{C}$ ( $99.0^\circ\text{F}$ ), blood pressure is $142/88\text{ mmHg}$ , pulse is $115\text{/min}$ , and respirations are $26\text{/min}$ . Pulse oximetry is $89\%$ on room air. Physical examination reveals a patient in moderate respiratory distress using accessory muscles of respiration. Assessment of the jugular venous pressure shows flat neck veins when the patient is seated at a 45-degree angle. Pulmonary auscultation reveals diffuse bilateral expiratory wheezes and a markedly prolonged expiratory phase, with no crackles. Cardiac auscultation reveals a regular tachycardia with a normal $S_1$ and $S_2$ ; there is no $S_3$ gallop or murmur. The lower extremities show no pitting edema. A portable chest radiograph demonstrates hyperinflated lung fields and flattened hemidiaphragms, with no evidence of pulmonary vascular congestion, focal infiltrates, or pleural effusions. Which of the following is the most appropriate initial management for this patient's acute presentation?

Nebulized short-acting bronchodilators and systemic corticosteroidsAnswer
B
Intravenous administration of furosemide
C
Intravenous administration of nitroglycerin
D
Broad-spectrum intravenous antibiotics
E
Oral administration of metoprolol

Answer

Nebulized short-acting bronchodilators and systemic corticosteroids

The correct answer addresses the patient's acute chronic obstructive pulmonary disease (COPD) exacerbation. While the patient has a history of ischemic cardiomyopathy, his current presentation lacks the hallmark signs of acute decompensated heart failure (ADHF). Specifically, he has flat neck veins, no pulmonary crackles, no

S_3

gallop, and no peripheral edema. Furthermore, the chest radiograph demonstrates hyperinflation typical of COPD without any pulmonary vascular congestion or pleural effusions. Therefore, the primary issue is bronchospasm and airway inflammation, which must be treated immediately with inhaled short-acting bronchodilators (such as albuterol and ipratropium) and systemic corticosteroids to improve airflow.

Step-by-Step Solution

Analyze the patient's history and presenting symptoms.

The patient has a dual history of HFrEF and COPD, presenting with acute dyspnea, clear sputum, hypoxemia, and tachycardia.

Establishing the baseline risk factors is critical when cardiopulmonary symptoms overlap.

Evaluate the physical examination and diagnostic findings.

Exam shows flat neck veins, wheezing without crackles, no S3 gallop, and no peripheral edema. Chest X-ray shows hyperinflation without vascular congestion.

Physical exam and imaging distinguish between fluid overload (heart failure) and bronchospasm/air trapping (COPD).

Synthesize findings to confirm the diagnosis.

The absence of fluid overload and the presence of hyperinflation confirm an acute COPD exacerbation, not acute decompensated heart failure.

Despite the history of cardiomyopathy, the current acute pathology is purely respiratory.

Determine the appropriate initial pharmacologic intervention.

Standard therapy for acute COPD exacerbation includes short-acting bronchodilators and systemic corticosteroids.

These agents rapidly reduce airway inflammation and relieve bronchoconstriction.

Key Concept

Differentiating acute COPD exacerbation from acute decompensated heart failure (ADHF) relies on physical exam (JVD, crackles, S3 indicate ADHF) and imaging (vascular congestion vs. hyperinflation) to guide appropriate initial therapy.

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