Symptomatic vasospasm occurs in 20%–30% of patients with SAH. It usually does not begin before day 3. Its occurrence peaks during days 7–8 and resolves spontaneously after 21 days. Vasospasm is thought to be due to spasmogenic substances during the lysis of subarachnoid blood clots.

How long do Vasospasms last?

Cerebral vasospasm may be present in some patients even in the first 24 hours of the precipitating event but more frequently begins 3 to 4 days after an aneurysm rupture, reaching a peak after 7 to 10 days and resolving spontaneously after 21 days.

Do cerebral Vasospasms go away?

Cerebral vasospasm after subarachnoid hemorrhage (SAH) is a preventable and reversible life-threatening condition.