Increased Risk of Transient Cerebral Ischemia After Subarachnoid Hemorrhage in Patients with Premorbid Opioid Use Disorders: A Nationwide Analysis of Outcomes.

BACKGROUND: Subarachnoid hemorrhage (SAH) is the most morbid sequela of intracranial aneurysms. Although mortality from SAH has been declining, opioid use in the United States has surged, and neurosurgeons are increasingly tasked with operating on patients with opioid use disorders (OUDs). There is a deficit in the literature regarding how OUDs affect SAH outcomes, particularly transient cerebral ischemic (TCI) events. The objective of this study was to investigate the influence of clinically diagnosed OUDs on the outcomes after acute SAH, with a specific focus on the rate of symptomatic TCI. METHODS: Patients with and without a diagnosed OUD who underwent either microsurgical clipping or endovascular coiling for SAH were queried from the 2012-2014 National Inpatient Sample using International Classification of Disease codes. The primary outcome was the rate of TCI after SAH treatment. RESULTS: A total of 25,330 patients were included, 310 of whom (1.22%) also carried a diagnosis of OUD. Univariate and multivariate regression showed that patients with OUD faced significantly increased odds of TCI (P = 0.044) compared with patients without OUD. OUD status was not associated with increased odds of other adverse outcomes, including overall complication, in-hospital mortality, poor outcome by a validated National Inpatient Sample SAH Outcome Measure, nonhome discharge, or extended hospitalization. CONCLUSIONS: Patients with OUD face significantly higher odds of symptomatic TCI events producing clinical deficits during hospitalization for acute SAH. These findings suggest usefulness in screening patients for OUD to identify individuals who may benefit from a higher level of clinical scrutiny for post-SAH TCI.