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Heart Sounds 


Harriet S. Meyer

The 4 heart sounds and 4 components are commonly abbreviated in discussions of cardiac auscultatory findings; numerical subscripts are used.S1 first heart sound  M1 mitral valve component  T1 tricuspid valve component S2 second heart sound  A2 aortic valve component  P2 pulmonic valve component S3 third heart sound S4 fourth heart sound Examples: The presence of an audible S3was consistent with the patient’s ventricular aneurysm. An audible S4 may be due to a variety of cardiac and systemic conditions. Sound names may be written out in full when discussed generically.Third heart sounds are suggestive of congestive heart failure, but an S3gallop

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