Which of the following is the most common cause of late neurological deterioration in a case of cerebrovascular accident :

Answer is B (Vasospasm): Vasospasnt: Narrowing of the aeries at the base of the brain following SAH occurs regularly. This vasospasm causes symptomatic ischemia and infarction in approximately 30% of patients and is the major cause of delayed morbidity or death. Sign of ischemia appear 4 to 14 days after the haemorrhage, most frequently at about 7 days - Harrisons 16th/ 2309 Four major causes of delayed neurological deficit Rerupture Hydrocephalus Vasospasm Hyponatremia