![]() Normal split of second heart sound closes in expiration as the reduced venous return shortens right ventricular ejection. Hang out interval is the time taken for the actual valve closure after the pulmonary artery and right ventricular pressure tracings crossover. This is mostly contributed to by the pulmonary hang out interval. Normal split of second heart sound is due to the delay in pulmonary valve closure compared to aortic valve. Paradoxical splitting of second heart sound
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