Active implantable medical device, in particular pacemaker, defibrillator or cardioverter having automatic adjustment of the stimulation pulse amplitude

An active implantable medical device, comprising:

• stimulation means for delivering pulses heart stimulation pulse of low energy for a treatment of cardiac rate disorders, said pulses having a predetermined amplitude and a predetermined duration, and
• means for adjusting the amplitude of the stimulation pulses, comprising means for automatically measuring capture thresholds, said measuring means operating at predetermined intervals and delivering a measured capture threshold value for use as a basis for the adjustment of the stimulation pulse amplitude;
• wherein the adjusting means further comprises means for validating the capture threshold value, including means for providing a reference value as a function of at least one of the corresponding capture threshold values previously measured, means for performing a coherence test between a last measured capture threshold value and the reference value, said coherence test having one of a positive result and a negative result, and means for inhibiting an adjustment of the stimulation amplitude in response to a positive result of said coherence test.