Sign in, or Join our Auscultation-Essentials plan. Join

Third Heart Sound Gallop 111

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 video 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.

Auscultation Sounds

auscultation sound from lesson
waveform

Patient Recording of Third Heart Sound Gallop 111

patient heart or lung sound
Third Heart Sound Gallop 111

Patient Recording - Half Speed

patient auscultation point for Third Heart Sound Gallop 111
Third Heart Sound Gallop 111

Position

Patient position for auscultation
The patient's position should be supine.

Listening Tips for Third Heart Sound Gallop 111

S1:Reduced intensity
S2:Increased intensity
Diastole:S3 early in diastole, low-pitched, heard during expiration

Waveform (Phonocardiogram)



Observe Cardiac Animation for Third Heart Sound Gallop 111

Authors and Sources

Authors and Reviewers


Sources

Return to Reference Guide Index Page
Third Heart Sound Gallop 111 | Lessons with Audio and Video | #84




An error has occurred. Please reload the page or visit our other website, Practical Clinical Skills. Reload 🗙