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Objective   Currently, the standard treatment modality for patients with acute ischemic stroke (AIS) presenting with isolated M2 occlusions is not specific. We therefore assessed the difference in treatment outcomes for patients with isolated M2 occlusions.Methods   We retrospectively analyzed consecutive patients with AIS presenting with isolated M2 occlusions from October 1, 2018, to June 30, 2020. Patients were divided into 3 groups based on the treatments they received: no reperfusion therapy (NRT), intravenous thrombolysis treatment (IVT), and endovascular intervention (EVT), which comprised IVT in conjunction with EVT or EVT alone. The primary outcomes were improvements in modified Rankin Scale (mRS) scores at 90 days and National Institutes of Health Stroke Scale (NIHSS) scores at 24 hours after treatment compared with the baseline. The secondary efficacy outcome comprised a good outcome rate defined as a 90 − day mRS score ≤ 2, final infarct volume (FIV), 90-day mortality rate, and successful recanalization rate, which was defined as a modified thrombolysis in cerebral infarction score ≥ 2b. Safety outcomes included symptomatic intracerebral hemorrhage and procedure-related complications.Results   Seventy patients were enrolled and divided into 3 groups: the NRT group ( n  = 25), IVT group ( n  = 27), and EVT group ( n  = 18). Twenty-four-hour posttreatment NIHSS scores were substantially decreased by EVT compared with NRT (adjusted  β  -4.01, 95% confidence interval [CI] -6.60 to -1.43;  P  = 0.003) or IVT (adjusted  β , -3.61 [95% CI, -6.45 to -0.77];  P  = 0.013). Compared with the outcomes observed after NRT, patients who received EVT were more likely to achieve lower 90-day mRS scores (adjusted  β , -1.42 [95% CI, -2.66 to -0.63];  P  = 0.007), higher good outcome rates (adjusted odds ratio, 8.73 [95% CI, 1.43-53.24];  P  = 0.019), and smaller FIVs (adjusted  β , -29.66 [95% CI, -59.73 to 0.42];  P  = 0.048). The recanalization rate of EVT was high (88.89%), and procedure-related complications were rare (5.56%).Conclusions   For acute, isolated M2 occlusions, EVT could dramatically and rapidly improve neurological deficits with high safety and effectiveness. These changes were observed at 24 hours after treatment and were maintained over the long term.

The Natural History and Reperfusion Therapy Outcomes of Acute Ischemic Stroke due to Isolated M2 Occlusions