The mean arterial pressure ( MAP ) before and after drug administration , time interval of two administrations , spontaneous recovery of heart beat after aorta unclamping , ventricular arrhythmia , changes of ST-segment 1 min after the recovery of heart beat , ante-parallel cycle time , aorta clamping time , post-parallel cycle time , dopamine dose after cardiac resuscitation , and perioperative changes of plasma TNF - and IL-6 levels were recorded .