[The criteria for the choice of a cardiac pacemaker (author's transl)].

The criteria commonly followed for the choice of a cardiac pacemaker to be used in the treatment of AV blocks and sick sinus syndrome are described. In case of AV block, the AA, believe that at first implant a ventricular inhibited pacemaker is to be preferred, while for the replacements the choice will be based on clinical grounds (mainly from the data obtained during the periodic controls, such as persistence of spontaneous activity, failure of sensing, etc.). In case of sick sinus syndrome, ventricular inhibited pacemakers are generally to be preferred firstly to secure stimulation even in case of AV block, secondly for the advantage of a greater stability of the endoventricular catheter. Atrial pacemakers (asynchronous, on demand, or bifocal) will be preferred when the atrial contribution is believed to be important from an haemodynamic point of view. Lastly, in single cases, its is possible to implant radiofrequency devices connected with the electrocatheter for the control of the tachyarrhythmic phases.