The main normal heart sounds are the S1 and the S2 heart sound. The S3 can be normal, at times, but may be pathologic. A S4 heart sound is almost always pathologic. Heart sounds can be described ...

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 ...

The fourth heart sound (S4), also known as the “atrial gallop,” occurs just before S1 when the atria contract ... overly compliant LV will produce a S3 heart sound. A S4 heart sound can ...