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Placement of extracorporeal membrane oxygenation (ECMO) in obese patients has been challenging; however, cannulation risk in obese patients has not been clearly investigated. We therefore explored ECMO cannulation complications in this obese population. Data were reviewed from adult ECMO database from 2010 to 2019. Patients were stratified by body mass index (BMI)(normal weight [NW][BMI 18.5–24.9], overweight [BMI 25–29.9], class I [BMI 30–34.9], class II [BMI 35–39.9], class III [BMI> 40]). Patients with central cannulation were excluded from this study. Combined ECMO cannulation complications and survival data were retrospectively analyzed. There were 233 patients, 156 venoarterial (VA) ECMO patients (45 [28%] NW, 51 [33%] overweight, 37 [24%] class I, 12 [8%] class II, and 11 [7.0%] class III) and 77 venovenous (VV) ECMO patients (14 [18%] NW, 13 [17%] overweight, 17 [22%] class I, 11 …