Third Heart Sound Gallop Auscultation Lesson with Recordings

Virtual Auscultation

patient torso with stethoscope chestpiece

patient position during auscultation
The patient's position is supine.

Lesson

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.
1

Waveform




Heart Sounds Video



Authors and Sources

Authors and Reviewers

Sources

? v:6 | onAr:0 | onPs:2 | tLb:6 | tLbJs:0
isPageNeedsInvoke:False | isTc: False | cc: US
isHome:False | uStat: False | db:0 | pu:False | jsNext:False | pv:1 | refreshTime: 1/1/0001 12:00:00 AM || now: 3/2/2024 3:27:55 AM



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