Decreased Intensity First Heart Sound Lesson #662

patient thorax when auscultating by stethoscope

patient position during auscultation
The patient was supine during auscultation.


Abnormalities, such as a previous heart attack, decreased thyroid function, congestive heart failure, coronary artery disease, AV Blocks, cardiomyopathy, and mitral regurgitation. The anatomy video provides one example of such conditions.

In addition, thick chest walls can dampen the transmission of heart sounds, resulting in the observation of diminished heart sounds



Decreased Intensity First Heart Sound

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

Authors and Reviewers


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