This drill will teach you to detect the presence of a split first heart sound. In this drill we contrast a cycle with an unsplit first heart sound and one with a split first heart sound.
The first component of the first heart sound is created by the closing of the mitral valve leaflets and the second by the closing of the tricuspid valve leaflets. The splitting, when it occurs is very short (~30 milliseconds).
Listen as long as you want. When you are confident that you can detect the difference, move on to the test. In the test we will play cycles randomly and ask you to tell which is which.