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Decreased Intensity First Heart Sound Lesson

Virtual Auscultation

patient torso with stethoscope chestpiece

patient position during auscultation
The patient's position is supine.


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


Heart Sounds Video

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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