Symptomatic vasospasm is the clinical syndrome of delayed cerebral ischemia associated with angiographically documented narrowing of a major cerebral arterial territory and TCD elevation of a specific arterial territory.
Hyponatremia and dehydration due to natriuresis after subarachnoid hemorrhage are related to symptomatic vasospasm. Therefore, most institutions are currently targeting euvolemia and eunatremia in subarachnoid hemorrhage patients to avoid complications 1).