The second heart sound (S2) is produced by the closure of the aortic and pulmonic valves. The sound produced by the closure of the aortic valve is termed A2, and the sound produced by the closure ...

The patterns of splitting of the S2 heart sound include physiologic splitting, paradoxical splitting, widened splitting and fixed splitting. A fixed split S2 is not common on cardiac exam.

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 ...