| 摘要 |
An active implantable medical device such as a pacemaker, defibrillator or cardioverter, able to detect a fusion situation for improving a capture threshold determination. This device is able to deliver to the patient's heart stimulation pulses presenting a predetermined amplitude and a duration, and adjusting the amplitude of these pulses. The adjustment involves calibrating the pulse amplitude, and delivering a stimulation pulse at null or at a primarily null voltage, and measuring automatically the ventricular capture threshold, including detecting the presence or absence of a capture consecutive to a stimulation. The fusion situation is monitored and, in the event of detected fusion situation, used to invalidate the adjustment of the stimulation pulse amplitude. This operates by delivering a stimulation pulse at null or primarily null voltage, and determining the presence of a fusion situation in the event of a detection of a capture in response to a stimulation at null or at primarily null voltage.
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