Heart sounds are the noises made when heart valves close as blood moves through the heart. S1 and S2 are normal heart sounds. Other heart sounds, such as S3 and S4, are abnormal. The heart has ...

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 ...

Like the S1 heart sound, the S2 sound is described ... Normally, A2 occurs just before P2, and the combination of these sounds make up S2. A physiologic split S2 occurs when the A2 sound precedes ...