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.

• play
• pause

Position: Mitral
Chestpiece: Diaphragm



Maneuver: Supine

Phonocardiogram

Heart Animation

Table of Contents

1	First Heart Sound - Loud
2	First Heart Sound (Minimally Split)
3	First Heart Sound (Markedly Split)
4	First Heart Sound - Decreased Intensity
5	Fourth Heart Sound Plus First Heart Sound
6	First Heart Sound plus Aortic Ejection Click

      

Practice Drill