APACHE II (OR 0.8, 95% CI 0.71 to 0.91, p=0.03), pre-ECMO arterial blood Lactate concentration (OR 0.85, 95% CI 0.76 to 0.96, p=0.04) and 6 hours after ECMO (OR 0.88, 95% CI 0.78 to 0.96, p=0.03, the duration of ICU stay (OR 1.08, 95% CI 1.02 to 1.17, p=0.03) were independent predictors of mortality.