Experience with about 1500 electrostimulated patients is reported. Rather than give statistical data we have preferred to go briefly through the problems encountered in the course of our experience and suggest possible solutions. We have emphasized the following aspects: ventricular-triggered pacemaker, stimulation threshold, haemodynamic behaviour of the paced patient, problems concerning implanted pacemakers follow-up. Our 13 years experience has opened new prospects which deserve further study, such as programmable pacemakers, optimal generator life and a few important aspects in follow-up techniques.