S1 and S2 are normal heart sounds. Other heart sounds, such as S3 and S4, are abnormal. The heart has four chambers and valves: Heart sounds are broken down into two categories: systolic (related ...

A S3 can be a normal finding in children, pregnant females, and well trained athletes, however a S4 heart sound is almost always abnormal. A S3 can be an important sign of systolic heart failure ...