Lub dub (S1 and S2) heart sounds explained in 30 seconds. Learn what is actually causing the "lub dub" sound when you are listening to heart sounds on a patient during an assessment. #shorts
The lub (s1) is caused by the closure of the mitral and tricuspid valves. The dub (s2) is caused by the closure of the aortic and pulmonic (also called pulmonary) valves.
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