S2 Heart Sound Lesson
Welcome to the S2 heart sound page. On this page we provide a definition, sample heart sounds and links to the training lessons available on this site.
What is an S2 Heart Sound?
The S2 heart sound is created by the closing of the aortic valve followed by the closing of the pulmonic valve.
The second heart sound occurs at the end of systole (ventricular contraction) and also marks the beginning of diastole.
S2 often has two audible components caused by the (separate) closing of the aortic and pulmonic valves.
Splitting of S2 heart sounds are covered in our course Second Heart Sounds