American Board of Internal Medicine (ABIM) Certification Practice Exam

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How many days after a subarachnoid hemorrhage does cerebral vasospasm most commonly occur?

1 to 3 days
3 to 5 days
5 to 10 days
10 to 14 days

The correct answer is: 5 to 10 days

Cerebral vasospasm typically occurs as a complication following a subarachnoid hemorrhage and is most commonly seen between 5 to 10 days after the initial event. This time frame is critical because vasospasm can lead to delayed ischemic neurological deficits, which significantly impacts patient outcomes. The pathophysiology involves the irritation of the cerebral arteries by the blood that has leaked into the subarachnoid space. This irritative process usually peaks around the one-week mark post-hemorrhage, aligning with the window for vasospasm development. By the 5 to 10 day range, the likelihood of experiencing vasospasm increases, making monitoring during this period essential for early intervention. Understanding the timeline of cerebral vasospasm is crucial for healthcare professionals caring for patients after a subarachnoid hemorrhage, as timely detection and management strategies can improve prognosis.