Step I PCWP and S2 Split Question

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Rosalindbungs said:
Why does a decreased PCWP (pulmonary capillary wedge pressure) cause narrowed S2 split?
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i don't know exactly but maybe just one idea>>>

pulmonary wedge pressure reflects left atrial pressure. if left atrial pressure decreases, there is less resistance for the pulmonary valve, because of decreased resistance in the blood circulation of the lung. the pulmonary valve may close earlier in such a condition. A2 and P2 would therefore come closer to each other. A2 would not be affected.

does this make sense ?
 
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