“…Third, data have been published which show that hearts in situ have resumed and maintained circulatory performance with a heavily altered metabolic pattern. A 30-40 % reduction in tissue ATP and total adenine nucleotide concentrations seems to be tolerable during the early post-ischaemic recovery phase [13]. Complete post-ischaemic restoration of cardiac function has been described in hearts with a tissue concentration of ATP at the end of ischaemia and postischaemia reperfusion of about 1.2 and 2 umol g" 1 , respectively, if appropriate measures were taken in the early recovery phase.…”