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First and Second Heart Sounds - Normal and Unsplit

This is a normal first and second heart sound at 60 beats per minute. You are auscultating at the Mitral valve area (Apex). The first heart sound has slightly greater intensity than the second heart sound.
  • The first heart sound is produced by the closing of the mitral and tricuspid valve leaflets.
  • The second heart sound is produced by the closing of the aortic and pulmonic valve leaflets.
  • The second heart sound is unsplit when the subject is holding his or her breath at peak expiration.

Auscultation Sounds

auscultation sound from lesson
waveform

Patient Recording

patient heart or lung sound
First and Second Heart Sounds - Normal and  Unsplit

Patient Recording - Half Speed

patient heart or lung sound
First and Second Heart Sounds - Normal and  Unsplit

Position

Patient position
The patient's position should be supine.

Listening Tips

Waveform (Phonocardiogram)



Observe Cardiac Animation

The first heart sound is produced by the closing of the mitral and tricuspid valve leaflets. The second heart sound is produced by the closing of the aortic and pulmonic valve leaflets.
Authors and Sources

Authors and Reviewers


Sources

Return to Reference Guide Index Page
First and Second Heart Sounds - Normal and Unsplit | #32


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