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First Heart Sound - Decreased Intensity

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

//embedding heart animation
A decrease in the vigor of contraction of the left ventricle causes decreased intensity first heart sound.

Authors

These authors contributed the audio recordings and text found in this reference guide: Jon Keroes, MD,Diane Wrigley, PA, and David Lieberman.
Medically reviewed by Dr. Barbara Erickson, PhD, RN, CCRN.



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