Part 1 · Cardiovascular Medicine
Same concept, other depth: Foundation →
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S2 is aortic (A2) then pulmonary (P2) closure, best heard at the base (pulmonary area for the split). On inspiration, more blood returns to the right heart and the pulmonary bed becomes more capacitant, so the RV ejects for longer and P2 is delayed — the normal, physiological split that closes again on expiration.
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