Physiologically Split S2
(Last Updated - 6/25/2007)

-normal splitting of S2 --> A2 (aortic valve closure) precedes P2 (pulmonic valve closure)
     -LV is electrically activated prior to RV
-physiologic splitting widens with inspiration --> increases RV volume (increases preload --> delays P2) also with a transient decrease in LV volume (A2 comes slightly earlier)

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