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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.

Listen

patient torso with stethoscope chestpiece
patient position during auscultation
The patient's position should be supine.

static waveform for 17

Visualize

static waveform for 17


Observe

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

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