Impact of age on survival for patients receiving ECPR for refractory out-of-hospital VT/VF cardiac arrest

Background: Extracorporeal cardiopulmonary resuscitation (ECPR) has been shown to improve neurologically favorable survival for patients with refractory ventricular tachycardia (VT)/ventricular fibrillation (VF) out-of-hospital cardiac arrest. Prior studies of the impact of age on outcomes in ECPR have demonstrated mixed results and we aim to investigate this relationship. Methods: Patients treated with ECPR at the University of Minnesota Medical Center for refractory out-of-hospital VT/VF arrest from December 2015 to February 2023 were included. The primary endpoints included neurologically favorable survival to discharge. A receiver operating characteristic curve was used to determine an optimal predictive age limit with the highest accuracy for neurologically favorable survival. Results: 391 consecutive patients were included: 22% (n = 86) were female and the mean age was 56.9 +/- 11.8 years. Age was independently associated with neurologically favorable survival to discharge, with a 30% decrease in survival with every 10-year increase in age (OR 0.7 (0.57-0.87), p = 0.001. Among those with neurologically favorable survival to discharge, older patients had longer length of hospital stay compared to younger age groups (p = 0.002) while patients who failed to achieve neurologically favorable survival to discharge had similar length of stay independent of age (p = 0.51). Conclusions: Age is associated with neurologically favorable survival to discharge for patients receiving ECPR for refractory out-of-the-hospital VT/ VF cardiac arrest. However, with a survival rate of 23% in the oldest age group, caution should be used when choosing age criteria for patient selection.