[Stimulation with automatic radiofrequency scanning in the long term treatment of tachyarrythmias].

A pacemaker is described which uses radiofrequency signals for synchronisation and pacing, and seeks automatically the phase of the cycle at which the tachycardia may be interrupted. The patient himself can activate the pacemaker. The programme of the external transmitter, which scans nearly all the R-R cycles of the tachycardia, may be pre-set to transmit one or two synchronised stimuli, with a progressive delay of 5 or 10 ms. If the tachycardia is interrupted the pacing stops automatically. The implantable unit of the device may be connected to a normal endocardial electrode, has no batteries and is of small size and weight. The method has been used with success in 4 patients with reciprocal junctional tachycardia (3 of these patients had the Wolff-Parkinson-White syndrome), and in one case of chronic recurrent ventricular tachycardia. All of them were refractory to conventional therapy.