Post-treatment Antiplatelet Therapy Reduces Risk for Delayed Cerebral Ischemia due to Aneurysmal Subarachnoid Hemorrhage

Neurosurgery. 2019 Dec 1;85(6):827-833. doi: 10.1093/neuros/nyy550.

Abstract

Background: Delayed cerebral ischemia (DCI) has a strong impact on outcome of patients with aneurysmal subarachnoid hemorrhage (SAH). Positive effect of antiplatelet therapy on DCI rates has been supposed upon smaller SAH series.

Objective: To analyze the benefit/risk profile of antiplatelet use in SAH patients.

Methods: This retrospective case-control study was based on institutional observational cohort with 994 SAH patients treated between January 2003 and June 2016. The individuals with postcoiling antiplatelet therapy (aspirin with/without clopidogrel) were compared to a control group without antiplatelet therapy. Occurrence of DCI, major/minor bleeding events in the follow-up computed tomography scans, and favorable outcome at 6 mo after SAH (modified Rankin scale < 3) were compared in both groups.

Results: Of 580 patients in the final analysis, 329 patients received post-treatment antiplatelet medication. There were no significant differences between the compared groups with regard to basic outcome confounders. Aspirin use was independently associated with reduced DCI risk (P < .001, adjusted odds ratio = 0.41, 95% confidence interval 0.24-0.65) and favorable outcome (P = .02, adjusted odds ratio = 1.78, 95% confidence interval 1.06-2.98). Regarding bleeding complications, aspirin was associated only with minor bleeding events (P = .02 vs P = .51 for major bleeding events).

Conclusion: Regular administration of aspirin might have a positive impact on DCI risk and outcome of SAH patients, without increasing the risk for clinically relevant bleeding events. In our SAH cohort, dual antiplatelet therapy showed no additional benefit on DCI risk, but increased the likelihood of major bleeding events.

Keywords: Antiplatelet therapy; Delayed cerebral ischemia; Intracranial aneurysm; Subarachnoid hemorrhage; Vasospasm.

Publication types

  • Observational Study

MeSH terms

  • Adult
  • Aged
  • Aspirin / therapeutic use*
  • Brain Ischemia / diagnostic imaging
  • Brain Ischemia / etiology
  • Brain Ischemia / prevention & control*
  • Case-Control Studies
  • Clopidogrel / therapeutic use*
  • Cohort Studies
  • Female
  • Humans
  • Male
  • Middle Aged
  • Platelet Aggregation Inhibitors / therapeutic use*
  • Retrospective Studies
  • Risk Factors
  • Subarachnoid Hemorrhage / complications
  • Subarachnoid Hemorrhage / diagnostic imaging
  • Subarachnoid Hemorrhage / drug therapy*
  • Time Factors
  • Tomography, X-Ray Computed / trends
  • Treatment Outcome

Substances

  • Platelet Aggregation Inhibitors
  • Clopidogrel
  • Aspirin