Decreased timing to vasospasm prophylaxis improves outcomes among patients with aneurysmal subarachnoid hemorrhage (aSAH) on prehospital CCBs, ARBs, or ACE-inhibitors.

Introduction: Aneurysmal subarachnoid hemorrhage (aSAH) patients are given calcium channel blockers (CCBs) to prevent brain vessel vasospasm. We hypothesized that preinjury antihypertensive use may protect against vasospasm. It remains unclear whether the timing of in-hospital CCB initiation affects the vasospasm risk in this population.