Beluga - Clinical Observations of Automatic Algorithms for Cardiac Pacing

Inclusion Criteria: * Dual chamber pacemaker (INSIGNIA ULTRA or AVT pacemaker), implant not older than 60 days, estimated life expectancy more than one year in case of associated illness, Age ≥ 18 years, signed patient information. Exclusion Criteria: * Indication for conventional treatment with ventricular resynchronisation or by implantable defibrillator during inclusion, implanted for severe permanent AVB (AVB 2/1 and complete), PR \> 250 ms, implant of the device older than 60 days before the inclusion date, Heart transplant foreseen within six months, unexplained syncope.