1879043 VA-ECMO venoarterial extracorporeal membrane oxygenation 1972 1879042 VA-ECMO veno-arterial ECMO 109 1879046 VA-ECMO veno-arterial extracorporeal circulatory membrane oxygenation 2 1879045 VA-ECMO arterial-venous extracorporeal membrane oxygenation 1 1879044 VA-ECMO veno-arterial extracorporeal oxygenation membrane 1 1879049 VA-ECMO venoarterial extracorporeal cardiopulmonary membrane oxygenation 1