Purpose: The prognosis after endovascular treatment (EVT) of acute arterial occlusions due to intracranial atherosclerotic disease (ICAD) may differ from those due to embolism. The aim was to evaluate whether safety and efficacy of EVT differ among patients with middle cerebral artery (MCA) M1 occlusion from ICAD or embolism.
Methods: A database review was conducted to identify EVT patients with acute MCA M1 occlusion from November 2013 to December 2018.The patients were divided into the ICAD group and embolic group according to the etiology of occlusion. Using propensity score analysis, patients with ICAD-related occlusion and embolism underwent 1:1 matching. Angiographic results, complications, and clinical outcomes were compared.
Results: A total of 217 patients (ICAD: 51; embolism: 166) were identified. After propensity score matching, 45 patients with ICAD-related occlusion and 45 with embolism were matched. All baseline covariates except atrial fibrillation were statistically indistinguishable. The rate of successful reperfusion (modified Thrombolysis in Cerebral Infarction [mTICI] 2b-3) was similar between the two groups, while the rate of mTICI 3 in the ICAD group was higher. No statistical difference was observed in the rate of postprocedural intracranial hemorrhage. The rate of favorable outcome (modified Rankin Scale [mRS] ≤2) and mortality at 90 days was comparable.
Conclusion: This propensity score analysis demonstrated that the EVT patients with acute ICAD-related MCA M1 occlusion had similar angiographic and clinical outcomes compared to those with M1 embolism on a similar baseline condition.
Keywords: Angioplasty; Large vessel occlusion; Reperfusion; Thrombectomy; Treatment outcome.