First Heart Sounds

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 tab.

First Heart Sound - Decreased Intensity
maneuver image
Maneuver:Supine
Chestpiece Position:Mitral
Chestpiece:Diaphragm