Exam
S3 Heart Sound
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S3 Heart Sound
, S3 Gallop, S3 Gallup Rhythm, Third Heart Sound
See Also
Heart Auscultation
S1 Heart Sound
S2 Heart Sound
S4 Heart Sound
Heart Murmur
Pediatric Murmur
Pathophysiology
S3 sound represents rapid passive ventricular filling
Occurs as ventricles start to expand during early diastole
Outside of normal causes (see below), typically represents ventricular overfilling
Associated with a dilated ventricle and
Systolic Dysfunction
Signs
S1, S2, S3 sound like "Ken-tuck-y" (lub-dub-dub)
Technique
Best heard in left lateral decubitus position
Causes
Normal
Age under 40 years
Third Trimester of pregnancy
Left or Right Ventricle Volume Overload
Mitral Regurgitation
Tricuspid Regurgitation
Congestive Heart Failure
Resources
University of Michigan Heart Sound and Murmur Library
http://www.med.umich.edu/lrc/psb/heartsounds/
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