Why not take the beating heart?
D000792:Angiography; D001344:Autopsy; D001926:Brain Death; D002560:Cerebrovascular Circulation; D004569:Electroencephalography; D016027:Heart Transplantation; D007603:Jurisprudence; D013997:Time Factors; D014022:Tissue Survival; D014184:Transplantation, Homologous