Heart Sounds
S1 produced by closure of the atrioventricular valves, mitral and tricuspid)- loudest at mitral area. The sound is a dull, low pitched “lub.”
S2 (produced by closure of aortic and pulmonic valve) is higher pitched, shorter and is the “dub” sound. Heard best at the base (aortic and pulmonic areas). S-2 is normally louder than S-1