First and Second Heart Sounds - Normal and Unsplit
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
Patient Recording
Patient Recording - Half Speed Playback
Position
The patient's position should be supine.
Listening Tips
Waveform (Phonocardiogram)
Observe
//embedding heart 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
These authors contributed the audio recordings and text found in this reference guide: Jon Keroes, MD,Diane Wrigley, PA, and David Lieberman.Medically reviewed by Dr. Barbara Erickson, PhD, RN, CCRN.
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