The Authors refer on about 35 cases of prophylactic peroperative cardiac electrostimulation on about 50,500 cases undergoing surgical procedures during seven years. The indications were: bifascicular block, complete left bundle branch block, primitive sinusal bradycardia, surgical correction of carotid synus syndrome, atrial fibrillation with spontaneous low ventricular rate, neurosurgical treatment of cranial trauma by suspected MAS syndrome, surgical implantation of epicardial electrodes. It is enphasized the necessity to continue with prophylactic peroperative cardiac stimulation in all these cases, except for bifascicular blocks for which one has to decide case by case according to the clinical history and ECG findings.