Pulmonary embolism 25% infarction: why?

[AlexBest96]

Why does embolus in the pulmonary artery (medium size) cause necrosis in 25% (in patients with cardiovascular compromise) of cases if we still have the same amount of bronchial circulation in both lungs such as in other 75% of cases? Who can really explain the mechanism by which the infarction occurs/or not step by step? I cant't find great explanation( Thank you!

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[WedgeDawg]

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