Abstract
The use of venoarterial extracorporeal membrane oxygenation (VA-ECMO) in adults for refractory cardiogenic shock has risen exponentially during the prior decade. Although VA-ECMO provides cardiopulmonary support, it can alter left ventricular (LV) loading conditions leading to LV distension, which makes the lungs susceptible to congestion and promotes intracardiac thrombosis. These conditions can be alleviated by pharmacologic and mechanical unloading, but gaps in knowledge remain on optimal timing and methods of this approach. This review provides an overview of the epidemiology of VA-ECMO, describes pathophysiology and methods for monitoring and reducing LV loading and summarizes contemporary studies examining the association between LV unloading and adverse events. We offer a simple protocol for implementing LV unloading during VA-ECMO to provide pulmonary protection and improve outcomes.
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