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First Heart Sound - Decreased Intensity

A decreased intensity first heart sound can be produced by various heart abnormalities, such as a viral infection of the heart called a cardiomyopathy. Other conditions include a previous heart attack and decreased thyroid function. The decreased intensity first heart sound is due to a decrease in the vigor of contraction of the left ventricle. See the anatomy video.

Auscultation Sounds

auscultation sound from lesson
waveform

Position

Patient position
The patient's position should be supine.

Listening Tips

S1:Reduced intensity

Waveform (Phonocardiogram)



Observe Cardiac Animation

A decrease in the vigor of contraction of the left ventricle causes decreased intensity first heart sound.
Authors and Sources

Authors and Reviewers


Sources

Return to Reference Guide Index Page
First Heart Sound - Decreased Intensity | #41


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