Easy Auscultation

We are using YouTube to publish selected lessons from our heart and lung sound lesson library.  Today’s lesson is Normal Heart Sounds – Unsplit.

http://www.youtube.com/watch?v=5TliS33sPIU

Chestpiece Position: Mitral
Maneuver: Supine

Usually, the first heart sound is slightly louder than the second heart sound when heard in the Mitral valve area.

In this case the first heart sound is much louder than the second heart sound. This can be produced by a thickened, but still mobile, mitral valve. Look at the anatomy tab to see the thickened mitral valve leaflets.

A very loud first heart sound can be an indication of mitral stenosis.

To listen to the audio track of the following videos, we recommend using headphones or earphones.

Waveform & Audio (double click to start)

Cardiac Animation (double click to start)

This heart sound is at 60 beats per minute. You are listening 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 valve leaflets.
• The second heart sound is produced by the closing of the the aortic valve leaflets.
• The second heart sound is unsplit when the subject is holding his or her breath at peak expiration.

This short movie will display the waveform for a normal first and second heart sound. Headphones should be used during listening.

This is a waveform of a normal heart sound.  Please use headphones or earphones to listen to the audio.

Note that for this normal heart sound S1 is louder than S2 and is not split while S2 is split.

• The time between S1 and S2 is the systolic interval
• The time between S2 and the next S1 is the diastolic interval

Normal Heart Sound