Vasospasm occurs when a brain blood vessel narrows, blocking blood flow. It can occur in the two weeks following a subarachnoid hemorrhage or brain aneurysm. You are at greater risk for a cerebral vasospasm if you have had a recent subarachnoid hemorrhage or ruptured brain aneurysm.
When do Vasospasms begin?
Vasospasm may occur in as many as 60–75% of patients after SAH. It occurs between days 4 and 21, with the peak incidence between days 5 and 9. Vasospasm rarely starts after day 12. It may result in further neurologic devastation due to ischemic strokes.
How common is vasospasm?
Vasospasm is the most common complication of SAH and is the main cause of delayed morbidity and mortality. It usually occurs 4 to 14 days after the initial accident, with a peak incidence at 7 days. Its rate of occurrence varies according to the authors from 40 to 70% 38. It is symptomatic in 17 to 40% of cases 10.
