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Difficulty: EasyCardiovascular System

A 72-year-old man is evaluated in the emergency department for severe, worsening shortness of breath that began two days ago. He reports waking up in the middle of the night gasping for air. His medical history includes ischemic heart disease, hypertension, and a 40-pack-year smoking history. Vital signs show a temperature of 37.1°C (98.8°F), blood pressure of 165/95 mmHg, pulse of 108/min, and respiratory rate of 24/min. Pulse oximetry is 90% on room air. The physician suspects acute decompensated heart failure rather than a chronic obstructive pulmonary disease exacerbation. Which of the following physical examination findings is most specific for confirming a cardiac etiology for this patient's dyspnea?

  1. Third heart sound (S3)Answer
  2. B
    Elevated jugular venous pressure
  3. C
    Bilateral expiratory wheezing
  4. D
    Lower extremity pitting edema
  5. E
    Prolonged expiratory phase

Answer

Third heart sound (S3)
The presence of a third heart sound (S3) is a highly specific finding for left ventricular volume overload and elevated left ventricular end-diastolic pressure. In a patient with risk factors for both pulmonary and cardiac disease, an S3 strongly confirms acute decompensated heart failure as the primary cause of the patient's dyspnea, as it is not present in isolated COPD exacerbations.

Step-by-Step Solution

1
Analyze the patient's presentation and risk factors.
The patient has dyspnea, paroxysmal nocturnal dyspnea, and a history of both coronary artery disease and heavy smoking, putting him at high risk for both acute decompensated heart failure (ADHF) and chronic obstructive pulmonary disease (COPD) exacerbation.
Differentiating between ADHF and COPD requires identifying signs that are highly specific to one condition over the other.
2
Evaluate the specificity of physical examination findings for left-sided heart failure.
An S3 gallop represents rapid ventricular filling into a non-compliant or overfilled left ventricle. It is a highly specific indicator of left ventricular dysfunction.
Other findings like JVD, edema, and wheezing can overlap between primary pulmonary and primary cardiac diseases.

Key Concept

Differentiating heart failure from COPD exacerbations using physical examination
Estimated Time:50s
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Topics

Cardiovascular System

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