dub

(noun)

The second heart tone, or S2 (A2 and P2), caused by the closure of the aortic valve and pulmonary valve at the end of ventricular systole.

Related Terms

Examples of dub in the following topics:

  • Heart Sounds

    • The two major heart sounds are "lub" (from the closure of AV valves) and "dub: (from the closure of aortic and pulmonary valves).
    • This sound may be described as either a "lub" or a "dub" sound.
    • The second heart sound, called S2, makes a "dub" sound caused by the closure of the semilunar (aortic and pulmonary) valves following ventricular systole.
    • S3 makes a "ta" sound after the "lub-dub" while S4 makes a "ta" sound before the "lub-dub".
    • The closing of the heart valves generates the "lub, dub" sounds that can be heard though a stethoscope.