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Difficulty: EasyCardiovascular System

A 68-year-old man presents to the emergency department with acute onset of severe shortness of breath that awoke him from sleep. He has a history of hypertension, type 2 diabetes mellitus, and a 40-pack-year smoking history. His temperature is 37.1°C, blood pressure is 165/95 mmHg, pulse is 110/min, and respirations are 24/min. Pulse oximetry shows 88% on room air. Physical examination reveals jugular venous distention and bilateral pitting edema to the knees. The physician is evaluating the patient for acute decompensated heart failure versus an exacerbation of chronic obstructive pulmonary disease (COPD). Which of the following additional findings would most specifically confirm acute decompensated heart failure in this patient?

  1. A
    Diffuse expiratory wheezing on auscultation
  2. B
    Decreased FEV1/FVCFEV_1/FVC ratio on spirometry
  3. Presence of a third heart sound (S3)Answer
  4. D
    Purulent sputum production
  5. E
    Compensated respiratory acidosis on arterial blood gas

Answer

Presence of a third heart sound (S3)
The presence of a third heart sound (S3) is a highly specific indicator of elevated left ventricular filling pressures and volume overload. This strongly confirms the diagnosis of acute decompensated heart failure in a patient with acute dyspnea. While the patient's extensive smoking history raises suspicion for a COPD exacerbation, an S3 gallop effectively differentiates heart failure from a primary pulmonary etiology.

Step-by-Step Solution

1
Identify the primary clinical problem and the physician's diagnostic dilemma.
The patient presents with acute dyspnea, hypoxemia, and signs of right-sided fluid overload. The differential diagnosis primarily includes acute decompensated heart failure and a COPD exacerbation due to his smoking history.
Establishing the competing diagnoses helps focus on findings that differentiate between a primary cardiac versus a primary pulmonary etiology.
2
Evaluate the specificity of physical examination findings for heart failure.
An S3 gallop represents rapid ventricular filling into an already overfilled, non-compliant ventricle. It is a hallmark sign of volume overload.
Identifying highly specific signs is necessary to confidently rule in acute decompensated heart failure.
3
Rule out findings that would instead support a COPD exacerbation.
Wheezing, purulent sputum, a decreased FEV1/FVCFEV_1/FVC ratio, and compensated respiratory acidosis all point toward a pulmonary origin or are non-specific.
Eliminating alternative findings ensures the selected answer uniquely confirms the cardiac diagnosis.

Key Concept

Differentiating acute decompensated heart failure from COPD exacerbations based on highly specific physical examination findings, such as an S3 gallop.
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Topics

Cardiovascular System

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