Sign in or Join for this module. Restore

First and Second Heart Sounds - Normal and Unsplit C31

Virtual Auscultation

patient torso with stethoscope chestpiece
patient position during auscultation

The patient's position should be supine.

Lesson

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.


Waveform





Heart Sounds Video

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 Reviewers

Authored by Dr. Jonathan Keroes, MD and David Lieberman, Developer, Virtual Cardiac Patient. Medically reviewed by Dr. Barbara Erickson, PhD, RN, CCRN. Last Update: 11/28/2021


An error has occurred. This application may no longer respond until reloaded. Reload 🗙