Auscultation Training by Repetition

Third Heart Sound Gallop - Abnormal

waveform
Listen for 2-3 minutes
maneuver
Supine
torso
Bell

Listening Tips
spacer
S1: Reduced intensity.
S2: Increased intensity.
Diastole: S3 early in diastole, low pitched, heard during expiration.

Lesson Text

A third heart sound occurs early in diastole. In young people and athletes it is a normal phenomenon. In older individuals it indicates the presence of congestive heart failure.

The third heart sound is caused by a sudden deceleration of blood flow into the left ventricle from the left atrium. In the anatomy tab you will see a thin-walled, dilated left ventricle with generalized decreased vigor of contraction.

In the presence of a third heart sound (S3) the first heart sound is decreased in intensity while the second heart sound is increased in intensity.

The third heart sound is a low frequency sound best heard with the bell of the stethoscope pressed lightly on the skin of the chest.

Comments on this beta version will be welcomed. Send to: comments@easyauscultation.com

This website is only for medical professional education. Contact a healthcare provider for medical care. Copyright 2017 © MedEdu LLC. All Rights Reserved. | About | Privacy Policy | Email

This website is only for medical professional education. Contact a healthcare provider for medical care. Copyright 2017 © MedEdu LLC. All Rights Reserved. About | Privacy Policy | Email