Abstract
BACKGROUND: Given the conflicting results regarding the clinical outcomes of venoarterial extracorporeal membrane oxygenation (VA-ECMO) based on etiology, its benefit for patients with cardiogenic shock (CS) remains controversial. This study aimed to report the real-world clinical outcomes of VA-ECMO treatment for patients with CS, based on the presence of acute myocardial infarction (AMI). METHODS: Patients treated with peripheral VA-ECMO between 2008 and 2023 at a tertiary cardiovascular center were included and classified into two groups based on CS etiology (AMI-CS and non-AMI-CS). Logistic regression models were used to compare in-hospital mortality and to identify prognostic predictors. RESULTS: Among the 667 patients included, 264 (39.6%) were classified as having AMI-CS. The rate of cardiac arrest before VA-ECMO initiation was higher in the AMI-CS group than in the non-AMI-CS group (69.7% vs. 55.8%; P < 0.001). Patients in the AMI-CS group were older (66 vs. 61 years; P < 0.001), more likely to be male (82.6% vs. 57.3%; P < 0.001), and had a lower left ventricular (LV) ejection fraction (20% vs. 25%; P < 0.001) than those in the non-AMI-CS group. The AMI-CS group had a lower in-hospital mortality rate (58.6% vs. 69.7%; odds ratio, 0.46; 95% confidence interval, 0.29-0.75; P = 0.002) compared with the non-AMI-CS group. The independent predictors of favorable clinical outcomes after VA-ECMO included younger age, shorter cardiac arrest duration, absence of severe LV dysfunction, absence of renal replacement therapy, higher hemoglobin levels, higher arterial pH, and lower lactate levels. The association between in-hospital mortality and AMI-CS was also demonstrated in the propensity score matching analysis. CONCLUSIONS: In this single-center study, AMI-CS was associated with a lower in-hospital mortality than non-AMI-CS after VA-ECMO treatment.