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Difficulty: MediumGeneral Internal Medicine

A 62-year-old woman visits the urgent care center complaining of severe difficulty breathing that started three days ago. She states that she has developed a dry, hacking cough and finds herself unable to sleep unless she is sitting upright in her recliner. Her medical history is significant for long-standing hypertension, type 2 diabetes mellitus, and a 35-pack-year smoking habit. She currently takes amlodipine, metformin, and daily low-dose aspirin. Her temperature is 37.1°C (98.8°F), blood pressure is 178/98 mmHg, pulse is 114/min, and respiratory rate is 26/min. Oxygen saturation is 89% on room air. Physical examination reveals distended neck veins while sitting at a 45-degree incline. Auscultation of the lungs reveals bilateral expiratory wheezes and fine inspiratory crackles at both lung bases. Cardiac auscultation demonstrates a regular tachycardia with a distinct S4 gallop. Which of the following is the most appropriate initial management for this patient's current condition?

  1. Intravenous administration of a loop diureticAnswer
  2. B
    Administration of systemic corticosteroids and inhaled bronchodilators
  3. C
    Empiric administration of intravenous levofloxacin
  4. D
    Measurement of arterial blood gases to calculate expected respiratory compensation
  5. E
    Evaluation of thyroid-stimulating hormone and free T4 levels

Answer

Intravenous administration of a loop diuretic is the correct intervention, as the presentation is consistent with acute decompensated heart failure requiring immediate preload reduction.
The patient's acute dyspnea, extreme orthopnea, elevated jugular venous pressure, S4 gallop, and bibasilar crackles with wheezing represent acute decompensated heart failure (ADHF) with pulmonary edema. In patients with severe hypertension and ADHF, immediate intervention with intravenous loop diuretics is the standard of care to rapidly reduce intravascular volume and left ventricular preload, thereby relieving pulmonary congestion.

Step-by-Step Solution

1
Analyze the patient's presenting symptoms and vital signs.
The patient has acute dyspnea, orthopnea (sleeping in a recliner), hypoxia (89% on room air), hypertension, and tachycardia.
Identifying the acuity and nature of the respiratory distress is critical to distinguishing between cardiac, pulmonary, and systemic etiologies.
2
Interpret the physical examination findings.
Elevated jugular venous pressure, an S4 gallop, bibasilar crackles, and wheezing are present.
An S4 gallop (indicating a stiff, non-compliant left ventricle) and JVD (indicating right-sided fluid overload) strongly point toward acute decompensated heart failure. The wheezing represents 'cardiac asthma' caused by peribronchial edema.
3
Determine the most appropriate immediate management.
Intravenous loop diuretics (such as furosemide) are indicated.
The primary mechanism of respiratory failure here is pulmonary edema due to left ventricular failure and volume overload. IV loop diuretics rapidly reduce preload and pulmonary congestion, improving oxygenation.

Key Concept

Patients with acute decompensated heart failure can present with wheezing ('cardiac asthma') due to peribronchial edema. The presence of JVD, orthopnea, and an S3 or S4 gallop helps differentiate it from a COPD exacerbation, and immediate management requires intravenous loop diuretics.
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General Internal Medicine

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