RESEARCH SUPPORT, NON-U.S. GOV'T
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Method of aneurysm treatment does not affect clot clearance after aneurysmal subarachnoid hemorrhage.

Neurosurgery 2012 January
BACKGROUND: Patients undergoing neurosurgical clipping or endovascular coiling of a ruptured aneurysm may differ in their risk of vasospasm.

OBJECTIVE: Because clot clearance affects vasospasm, we tested the hypothesis that clot clearance differs in patients depending on method of aneurysm treatment.

METHODS: Exploratory analysis was performed on 413 patients from CONSCIOUS-1, a prospective randomized trial of clazosentan for the prevention of angiographic vasospasm in patients with aneurysmal subarachnoid hemorrhage (SAH). Clot clearance was measured by change in Hijdra score between baseline computed tomography and one performed 24 to 48 hours after aneurysm treatment. Angiographic vasospasm was assessed by the use of catheter angiography 7 to 11 days after SAH, and delayed ischemic neurological deficit (DIND) was determined clinically. Extended Glasgow Outcome Score (GOSE) was assessed 3 months after SAH, and poor outcome was defined as death, vegetative state, or severe disability. Multivariable ordinal and binary logistic regression were used.

RESULTS: There was no significant difference in the rate of clot clearance between patients undergoing clipping or coiling (P = .56). Coiling was independently associated with decreased severity of angiographic vasospasm (odds ratio [OR] 0.53, 95% confidence interval [CI] 0.33-0.86), but not with DIND or GOSE. Greater clot clearance decreased the risk of severe angiographic vasospasm (OR 0.86, 95% CI 0.81-0.91), whereas higher baseline Hijdra score predicted increased angiographic vasospasm (OR 1.17, 95% CI 1.11-1.23) and poor GOSE (OR 1.09, 95% CI 1.04-1.14).

CONCLUSION: Aneurysm coiling and increased clot clearance were independently associated with decreased severity of angiographic vasospasm in multivariate analysis, although no differences in clot clearance were seen between coiled and clipped patients.

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