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Difficulty: EasyCardiovascular System

A patient with a significant history of systemic hypertension and extensive tobacco use is evaluated in the outpatient setting for progressive dyspnea, orthopnea, and recent episodes of waking up gasping for air. Vital signs show a blood pressure of 152/94 mm Hg, a heart rate of 98/min, and a respiratory rate of 22/min. Lung auscultation demonstrates bilateral crackles at the lung bases and scattered expiratory wheezes. The clinician suspects acute decompensated heart failure but wants to differentiate it from a chronic obstructive pulmonary disease exacerbation. Which of the following physical examination findings is most specific for identifying decompensated heart failure in this clinical scenario?

  1. A
    Prominent use of accessory muscles of respiration
  2. B
    Increased anteroposterior diameter of the chest
  3. Presence of a third heart sound (S3) gallopAnswer
  4. D
    Hyperresonance to percussion over the lung fields
  5. E
    Diffuse expiratory wheezing throughout all lung fields

Answer

Presence of a third heart sound (S3) gallop
The presence of a third heart sound (S3) gallop is highly specific for heart failure in a patient presenting with acute dyspnea. An S3 occurs during early diastole due to rapid ventricular filling into a non-compliant or volume-overloaded left ventricle, which is the hallmark of acute decompensated heart failure.

Step-by-Step Solution

1
Analyze the patient's presenting symptoms and physical exam findings.
The patient presents with dyspnea, orthopnea, crackles, and wheezing, which overlap between heart failure and COPD.
Establishing the clinical overlap is necessary to determine which specific finding separates the two diagnoses.
2
Identify the most specific clinical sign for volume overload.
An S3 gallop is selected because it directly reflects high ventricular filling pressures.
Differentiating primary cardiac etiology from primary pulmonary etiology requires a highly specific marker of cardiac dysfunction.

Key Concept

Physical examination differentiation of acute decompensated heart failure from COPD exacerbation.
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Topics

Cardiovascular System

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