The Third Heart Sound | Cardio Exam - MedSchool
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Cardio Exam
 
 
Cardio Exam
The third heart sound (S3) is a pathological finding associated with rapid ventricular filling.
 

The Third Heart Sound

 
 

Overview

  • The third heart sound (S3) is a pathological finding associated with rapid ventricular filling.
    • Interpretation

    • Listen for a gallop rhythm with an extra heart sound just after S2. This is best heard with the bell of the stethoscope at the apex.
    • Causes of Third Heart Sound

    • Normal in children and young adults
    • Left ventricular failure
    • Severe mitral regurgitation
    • Severe aortic regurgitation
    • Constrictive pericarditis
  • Gallop rhythms are so named due to the similarity of their cadence with that of the sound of a horse galloping.
Last updated on January 24th, 2020
 
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