Clinical Characteristics as Predictors of Early and Delayed Cerebral Infarction in Aneurysmal Subarachnoid Hemorrhage Patients: A Meta-Analysis of 4527 Cases

Predictors of delayed cerebral infarction (DCI) and early cerebral infraction (ECI) among aneurysmal subarachnoid hemorrhage (aSAH) patients remain unclear. We aimed to systematically review and synthesize the literature on predictors of ECI and DCI among aSAH patients. We systematically searched PubMed, EMBASE, Cochrane Library, and Scopus databases comprehensively from inception through January 2024 for observational cohort studies examining predictors of DCI or ECI following aneurysmal SAH. Studies were screened, reviewed, and meta-analyzed, adhering to PRISMA and Cochrane guidelines. The data were pooled as Odds ratios (OR) with 95% confidence intervals (CI) using RevMan 5.4 software. Methodologic quality was assessed with the Newcastle-Ottawa Scale. Our meta-analysis included 12 moderate to high-quality cohort studies comprising 4527 patients. Regarding DCI predictors, Higher severity scores (O.R.=1.49, 95%CI [1.12,1.97], P=0.005) and high Fisher scores (O.R.=2.23, 95%CI [1.28,3.89], P=0.005) on presentation were significantly associated with an increased risk of DCI. Also, the female sex and the presence of vasospasm were significantly associated with an increased risk of DCI (O.R.=3.04, 95%CI [1.35,6.88], P=0.007). In contrast, preexisting hypertension (p=0.94), aneurysm treatment (p=0.14), and location (p=0.16) did not reliably predict DCI risk. Regarding ECI, the pooled analysis demonstrated no significant associations between sex (P=0.51), pre-existing hypertension (P=0.63), severity (P=0.51), or anterior aneurysm location versus posterior (P=0.86) and the occurrence of ECI. Female sex, admission disease severity, presence of vasospasm and Fisher grading can predict DCI risk post-aSAH. Significant knowledge gaps exist for ECI predictors. Further large standardized cohorts are warranted to guide prognosis and interventions.