This drill will teach you to detect the presence of a fourth heart sound. A fourth heart sound is heard late in diastole, just before the next first heart sound. A fourth heart sound is an important indicator of poor ventricular function.
In this drill we will play a heart sound cycle with a third heart sound and contrast it to one with a fourth heart sound. A third heart sound has a rhythm similar to "Kentucky" and a fourth heart sound rhythm is similar to "Tennessee."
A third heart sound has a slightly lower frequency than the first and second heart sounds. The fourth heart sound is even lower than the third.
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.