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torso with stethoscope chestpiece

This video is an animation of First Heart Sound - Decreased Intensity A#23 (lesson# 4) within course number 4.

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 tab.

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