Auscultation Training by Repetition

Third Heart Sound Gallop - Abnormal - C401, #84

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Supine

Bell

Listening Tips

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

Repetition Training - Basic Heart Sounds

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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.

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soundID	62
maneuver	Supine
Title	Third Heart Sound Gallop - Abnormal
Position	Mitral
realSoundID	5005
caseID	84
S1	Reduced intensity
Systole
S2	Increased intensity
Diastole	S3 early in diastole, low pitched, heard during expiration
features
lung sounds	False
chestpiece	Bell

c401

CaseID	84
CourseID	25
CourseCaseOrder	1
ID	73