Hemoglobin trigger and approach to red blood cell transfusions during veno-venous extracorporeal membrane oxygenation: the international TRAIN-ECMO survey.

Although the use of a predefined Hb trigger is still under-adopted among centers with low or median extracorporeal membrane oxygenation case volume, the majority of respondents use a higher Hb trigger for veno-venous extracorporeal membrane oxygenation patients compared with other critically ill patients. Higher volume centers tolerate lower Hb levels.