The incidence of rebleeding after a ruptured cerebral aneurysm is highest during which of the following time periods?
a. First 24 hours
b. 4 to 12 days
c. 3 to 4 weeks
d. 3 to 6 months
A
Rebleeding is the occurrence of a second subarachnoid hemorrhage in an unsecured aneurysm or, less commonly, an arteriovenous malformation. The incidence of rebleeding during the first 24 hours after the first bleed is 4%, with a 1% to 2% chance per day for the following month. Mortality with aneurysmal rebleeding is approximately 70%.
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