Medically reviewed by Jeffrey S. Lander, MD Key Takeaways S1 and S2 are the normal heart sounds you hear when the heart ...

Graphical diagnostics: Signals from a normal aortic valve (left) show two separated sounds while those from a defective aortic valve (right) display diamond-shaped murmurs. The sound data were used to ...

A heart murmur can sound scary—literally. A Keck Medicine of USC cardiologist explains why it might not be as scary as you ...

The S3 heart sound occurs as the mitral valve opens and allows blood to fill the left ventricle passively. The sound happens as a result of blood striking the left ventricle during early diastole. An ...

An S4 heart sound is a low-pitched sound that occurs toward the end of the diastole. In some cases, an underlying health condition, often one affecting the left ventricle, may cause the S4 heart sound ...