While these events are occurring on the left side of the heart, similar changes are occurring on the right, involving the right atrium, right ven-ricle, tricuspid valve, pulmonic valve, and pulmonary artery. Right ven-icular and pulmonary arterial pressures are significantly lower than cor-esponding pressures on the left side. Furthermore, right-sided events ^usually occur slightly later than those on the left. Instead of a single heart sound, you may hear two discernible components, the first from left-sided
S2 OS S3
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