Which of the following is the most common cause of the neurological deterioration in case of cerebrovascular accident?

Vasospasm Narrowing of the aeries at the base of the brain following SAH occurs regularly. This vasospasm causes symptomatic ischemia and infarction in approximately 30% patients and is the major cause of delayed morbidity or deathQ. Sign of ischemia appear 4-14 days after the hemorrhage, most frequently at about 7 daysQ.