Objeetive To investigate the effects of nimodipine combined with edaravone on cerebral vasospasm (CVS) and delayed cerebral ischemia (DCI) following aneurysmal subarachnoid hemorrhage (aSAH).Methods The consecutive patients with aSAH who underwent microsurgical clipping were included retrospectively.All patients received intravenous prophylaxis with nimodipine,and some patients also used edaravone (30 mg,twice a day for 2 weeks).They were divided into either a CVS group or a non-CVS group according to the findings of transcranial Doppler.They were also divided into a DCI group and a non-DCI group according to the findings of CT reexamination and clinical examination.The demographics,baseline clinical data,Glasgow Coma Scale (GCS) score,Fisher grade,Humt-Hess grade,and aneurysm location of all patients were collected.The multivariate logistics regression analysis was used to identify the independent risk factors for CVS and DCI.Results A total of 220 patients with aSAH were enrolled in the study,132 (60.0％) had CVS and 106 (48.2％) had DCI.One hundred twenty-three patients (55.9％)were treated with nimodipine + edaravone,97 were treated with nimodipine alone,none of them died.The incidences of CVS (51.2％ vs.71.1％;x2 =8.962,P =0.003) and DCI (35.0％ vs.65.0％;x2 =19.535,P ＜0.001) in patients receiving nimodipine + edaravone therapy were significantly lower than those receiving nimodipine alone.The proportions of hypertension,hyperlipidemia,diabetes,smoking,high Fisher grade in the CVS group were significantly higher than those in the non-CVS group (all P ＜0.05),while the proportion of patients receiving nimodipine + edaravone therapy (47.7％ vs.68.2％;g2 =8.962,P =0.003) and the GCS score (11.2 ±3.1 vs.13.4 ±2.6;t =5.492,P＜0.001) were significantly lower than those in the non-CVS group.Multivariate logistic regression analysis showed that low GCS score (odds ratio [OR] 6.57,95％ confidence interval [CI] 1.04-12.96;P=0.001),high Fisher grade (OR 5.39,95％ CI 4.09-20.15;P =0.004),hyperlipidemia (OR 4.39,95％ CI 2.97-34.15;P =0.004),hypertension (OR 3.24,95％ CI 1.06-13.47;P=0.016) were the independent risk factors for CVS,while received nimodipine + edaravone was the independent protective factor for CVS (OR 0.39,95％ CI0.13-0.91;P =0.039).The proportions of patients with hypertension,hyperlipidemia,diabetes,smoking,and high Fisher grade in the DCI group were significantly higher than those in the non-DCI group (all P ＜0.05),while the proportion of patients received nimodipine + edaravone (40.6％ vs.70.2％;x2 =19.535,P ＜ 0.001) and the GCS score (10.2 ± 2.4 vs.13.8 ± 2.6;t =10.648,P ＜ 0.001) were significantly lower.Multivariate logistic regression analysis showed that low GCS score (OR 8.92,95％ CI 2.48-26.94;P =0.001),high Fisher grade (OR 7.49,95％ CI 1.96-20.47;P =0.001) were the independent risk factors for DCI,while.received nimodipine +edaravone was an independent protective factor for DCI (OR 0.27,95％ CI 0.08-0.97;P =0.020).Conclusions Compared with nimodipine alone,nimodipine combined with edaravone can significantly reduce the incidences of CVS and DCI.The GCS score,high Fisher grade,and hypertension are the independent risk factors for CVS and DCI in patients with aSAH,and nimodipine combined with edaravone is the independent protective factor for CVS and DCI.