Exam

S1 Heart Sound

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S1 Heart Sound, First Heart Sound

  • See Also
  1. Heart Auscultation
  2. S2 Heart Sound
  3. S3 Heart Sound
  4. S4 Heart Sound
  5. Heart Murmur
  6. Pediatric Murmur
  • Physiology
  1. S1 Heart Sound represents closure of the mitral and tricuspid valves
  • Causes
  • S1 Augmented
  1. Increased Cardiac Output
    1. Anemia
    2. Hyperthyroidism
  2. Mitral Stenosis
  • Causes
  • S1 Diminished
  1. First degree AV Block
  2. Mitral Regurgitation
  3. Congestive Heart Failure
  4. Coronary Artery Disease
  • Causes
  • S1 Variable
  1. Third degree AV Block
  2. Atrial Fibrillation
  • Resources
  1. University of Michigan Heart Sound and Murmur Library
    1. http://www.med.umich.edu/lrc/psb/heartsounds/