What is the typical time window during which vasospasm can lead to delayed cerebral ischemia after subarachnoid hemorrhage?

What is the typical time window during which vasospasm can lead to delayed cerebral ischemia after subarachnoid hemorrhage?

• A. 3-21 days post-event
• B. Immediately within hours
• C. One week
• D. Three months

Answer: (A)

Vasospasm after a subarachnoid hemorrhage tends to be a delayed complication, not an immediate one. Blood breakdown products in the subarachnoid space irritate cerebral arteries, causing vasoconstriction and reduced cerebral blood flow. This process usually begins around day 3 after the bleed, often peaks a bit later, and can continue for about two to three weeks. Therefore the period during which vasospasm can lead to delayed cerebral ischemia is roughly from day 3 to day 21 post-event. That’s why this window is the best answer. An onset within hours is too early for vasospasm-related ischemia, a one-week window captures only part of the risk, and three months is far outside the typical risk period.

Vasospasm after a subarachnoid hemorrhage tends to be a delayed complication, not an immediate one. Blood breakdown products in the subarachnoid space irritate cerebral arteries, causing vasoconstriction and reduced cerebral blood flow. This process usually begins around day 3 after the bleed, often peaks a bit later, and can continue for about two to three weeks. Therefore the period during which vasospasm can lead to delayed cerebral ischemia is roughly from day 3 to day 21 post-event. That’s why this window is the best answer. An onset within hours is too early for vasospasm-related ischemia, a one-week window captures only part of the risk, and three months is far outside the typical risk period.