As shown in Figure 3, concentration of ATP, CP and total high-energy phosphates (HEP), within 15 minutes (control) of cardiac arrest were significantly greater in 4°C as compared to 21°C cardioplegia hearts (P < 0.001) possibly due to the greater consumption of energy in 21°C group hearts as they required approximately 10 seconds longer for total arrest. This evidence concerns the gene CP and cardiac arrest.