First and Second Heart Sounds - Normal and Unsplit G

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 Sound From Lesson

Patient Recording

First and Second Heart Sounds - Normal and Unsplit

Patient Recording - Half Speed Playback

Position

The patient's position should be supine.

Listening Tips

S1:
Systole:
S2:
Diastole:

Observe

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.