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Signals end of systole and beginning of diastole, when the ventricles relax and fill with blood from the atria.
S3 and S4
Heard with bell over mitral area with patient in left lateral recumbent position (laying on left side)
Occurs when blood enters ventricle and hits a stiff ventricular wall (with pts who have had heart attacks and have dead scar tissue in the heart)
differences between S2 split and S3
bell vs diaphragm; lying (left side) vs sitting; S2 split comes and goes
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