Is S2 Splitting Normal

Splitting of the S2 during inspiration is a normal finding and should be sought in all patients. The aortic and pulmonary pressure in diastole closes the semilunar valves.

What is between S1 and S2?

S1 is normally a single sound because mitral and tricuspid valve closure occurs almost simultaneously. Clinically S1 corresponds to the pulse. The second heart sound (S2) represents closure of the semilunar (aortic and pulmonary) valves (point d).

What are normal heart sounds?

Normal heart sounds Normally, the heart beat has two sounds – lub-dub. The first sound is heard as the mitral and tricuspid valves close. The second heart sound is the aortic and pulmonic valves snapping shut.