Figure 1. Parabiotic perfusion device. The blood aspirated from the carotid artery of the receptor rabbit is taken to the arterial reservoir and perfused retrograde into the aorta of the donor heart through the aortic perfusion line. The blood from the coronary sinus of the studied heart and the surplus of the pre-established level of the arterial reservoir are collected in the collecting bottle and re-infused to the receptor by the internal jugular vein. The perfusion pressure is constant and is established by the size of the perfusate column take from the arterial reservoir to the distal end of the aortic perfusion line.