A hypertensive crisis (severely elevated blood pressure) places a patient at greatest risk for which acute complication?

A hypertensive crisis (markedly elevated BP, often >180/120 mmHg) significantly raises the risk of cerebral aneurysm rupture, hemorrhagic stroke, hypertensive encephalopathy, aortic dissection, and acute heart failure — vasovagal syncope is actually a low blood pressure/bradycardia-mediated event, essentially the opposite mechanism.