Transmedic Organ Care System (OCS) allows preservation of the donor heart by perfusing the organ at 34°C in a beating state and providing additional assessment options. The perfusion protocols as established by the manufacturer is valid for adult human hearts, using coronary flows in the 8-900ml/min range guided by lactate measurements. Higher flow can facilitate higher degrees of cardiac oedema which can be associated with diastolic dysfunction, and generel impairment of contractility of the heart.