The safety of intraoperative lumbar subarachnoid drainage for acutely ruptured intracranial aneurysm: technical note.

Recently, some concern has arisen regarding the safety of intraoperative spinal drainage for brain relaxation in aneurysm surgery, due to anecdotal association with both aneurysmal rebleeding and increases in symptomatic vasospasm. To address these concerns, we reviewed our experience with frequent spinal drainage and early surgery in 432 consecutive cases of surgically treated aneurysmal subarachnoid hemorrhage. Unless contraindicated by mass effect or associated pathology, all grade I-III patients referred within 14 days were treated with spinal drainage at surgery. In this cohort (n = 314), there were no cases of meningitis or nerve root injury. Only one case of intraoperative rebleeding could be associated with spinal drain placement (0.3%). In grade IV-V patients, 47% required preoperative ventriculostomy, and 11% were ineligible for spinal drainage due to mass effect. There were, however, no complications related to spinal drainage in the remaining 23 patients. Permanently-shunted hydrocephalus (8%) and symptomatic vasospasm (19%) were infrequent overall. When analyzed by grade, spinal drains were generally associated with equal or reduced incidence of these developments when compared to patients without spinal drainage. We conclude that brain relaxation can be safely and effectively obtained using intraoperative spinal drains during early aneurysm surgery.