While veno-arterial extracorporeal membrane oxygenation (VA-ECMO) has been utilized to resuscitate and stabilize haemodynamics in patients of acute myocardial infarction (AMI) complicated by cardiac arrest (CA), it is essential to predict the possibility of weaning from ECMO to determine further strategies, including use of ventricular assist device. We aimed to determine predictors of successful weaning from VA-ECMO in the early phase of ECMO treatment.Methods:
We identified consecutive patients of AMI complicated by CA treated with VA-ECMO and percutaneous coronary intervention (PCI). Clinical data within 48 hours after ECMO initiation were assessed and multiple logistic regression analysis was performed to determine independent predictors of weaning outcome.Results:
Fifty-five patients were analyzed. While twenty-eight (51%) patients were successfully weaned from VA-ECMO, 27 (49%) failed to wean. Multivariate analysis identified post-PCI thrombolysis in myocardial infarction (TIMI) flow grade (p = 0.046), mean arterial pressure (MAP) at 4 hours after ECMO initiation (p = 0.010), and serum lactate at 24 hours (p = 0.015) as independent predictors of successful weaning. LVEF at 24 and 48 hours were significantly greater in the successful weaning group (p = 0.014, p = 0.025, respectively).Conclusions:
Successful weaning from VA-ECMO was predicted by post-PCI TIMI flow grade, MAP at 4 hours, and serum lactate at 24 hours after VA-ECMO initiation in patients of AMI complicated by CA. Furthermore, in patients who failed to wean from ECMO, LVEF did not recover within 48 hours. In such patients, adjunctive use of other circulatory mechanical devices must be considered.