Participants
intracranial aneurysm, aneurysmal, Aneurysm, hemorrhage, acute subarachnoid hemorrhage
ANEURYSM, HEMORRHAGE, SUBARACHNOID HEMORRHAGE, INTRACRANIAL ANEURYSM
To be eligible, patients had to be 18 years or older and present with acute subarachnoid hemorrhage diagnosed by computed tomography (CT) and confirmation of an intracranial aneurysm by CT angiography or digital subtraction angiography. Aneurysm treatment was required to be performed within 48 hours after subarachnoid hemorrhage. Exclusion criteria included contraindications for placement of a lumbar drain, notably absent or compressed basal cisterns on admission CT or the presence of therapeutic anticoagulation, pregnancy, participation in another interventional trial, reduced life expectancy, and hemorrhage of other than aneurysmal origin (eTable 1 in 