Exam
S1 Heart Sound
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S1 Heart Sound
, First Heart Sound
See Also
Heart Auscultation
S2 Heart Sound
S3 Heart Sound
S4 Heart Sound
Heart Murmur
Pediatric Murmur
Physiology
S1 Heart Sound represents closure of the mitral and tricuspid valves
Causes
S1 Augmented
Increased
Cardiac Output
Anemia
Hyperthyroidism
Mitral Stenosis
Causes
S1 Diminished
First degree
AV Block
Mitral Regurgitation
Congestive Heart Failure
Coronary Artery Disease
Causes
S1 Variable
Third degree
AV Block
Atrial Fibrillation
Examples
S1 with Wide Split
HeartNormalSplitS1Tricuspid.wav
HeartWideSplitS1.wav
Resources
University of Michigan Heart Sound and Murmur Library
http://www.med.umich.edu/lrc/psb/heartsounds/
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