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Difficulty: MediumPhysical Examination Findings

A 34-year-old woman, who recently immigrated from a developing country, is evaluated in the clinic for progressively worsening exertional dyspnea, fatigue, and orthopnea over the past 8 months. She also reports two recent episodes of coughing up blood-tinged sputum. Vital signs show a regular heart rate of 82/min, blood pressure of 110/70 mm Hg, and respiratory rate of 18/min. Cardiac auscultation at the apex in the left lateral decubitus position reveals a loud S1, an extra early diastolic sound, and a low-pitched diastolic rumbling murmur with presystolic accentuation. Which of the following physical examination characteristics is the most reliable indicator of severe disease in this patient?

  1. A
    A prominently displaced apical impulse lateral to the midclavicular line
  2. B
    A noticeably increased intensity of the diastolic rumbling murmur
  3. A shortened time interval between the aortic valve closure sound and the extra early diastolic soundAnswer
  4. D
    A delayed and diminished amplitude of the carotid pulse upstroke
  5. E
    A holosystolic, blowing murmur heard best at the lower left sternal border that increases with inspiration

Answer

A shortened time interval between the aortic valve closure sound and the extra early diastolic sound (Opening Snap).
The patient's presentation and auscultatory findings (loud S1, opening snap, mid-diastolic rumble) are classic for mitral stenosis, most likely secondary to rheumatic heart disease. The extra early diastolic sound described is the opening snap (OS). The severity of mitral stenosis is directly related to left atrial pressure. As the stenosis worsens and left atrial pressure rises, the pressure gradient between the left atrium and left ventricle crosses over earlier in diastole. This forces the stenotic mitral valve to open sooner after aortic valve closure (A2), resulting in a shortened A2-OS interval. Therefore, a shorter interval is the most reliable physical examination indicator of severe disease.

Step-by-Step Solution

1
Identify the underlying diagnosis based on the clinical vignette.
The patient's presentation and auscultatory findings (loud S1, early diastolic extra sound, mid-diastolic rumble) confirm a diagnosis of mitral stenosis.
Recognizing the classic physical examination pattern for mitral stenosis is required before evaluating disease severity.
2
Identify the 'extra early diastolic sound' described in the vignette.
The sound is the opening snap (OS) characteristic of a stenotic mitral valve abruptly opening.
Understanding the components of the murmur is necessary to interpret severity.
3
Correlate the pathophysiological changes of worsening mitral stenosis with physical examination findings.
Increased severity leads to higher left atrial pressure, forcing the valve to open earlier in diastole.
Hemodynamic principles directly translate to auscultatory timing.
4
Select the physical examination characteristic that directly reflects this hemodynamic change.
A shorter time interval between aortic valve closure (A2) and the opening snap (OS) reliably indicates more severe disease.
This is the most direct physical exam proxy for measuring left atrial pressure.

Key Concept

The severity of mitral stenosis is inversely proportional to the A2 to opening snap (A2-OS) interval on physical examination.
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Topics

Physical Examination Findings

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