Abstract: An active implantable medical device, especially of a cardiac pacemaker, defibrillator and/or cardiovertor type, having a dual chamber stimulation function and protection against cross-sensing atrio-ventricular phenomena. Cardiac events, spontaneous or stimulated, are detected in a first cavity, preferably the atrium, and a second cavity is stimulated, preferably the ventricle, The detection and confirmation of cross-sensing is performed by detecting in the atrium a signal coming from a depolarization consecutive to a preceding stimulation of the ventricle, and distinguishing such a signal from a signal resulting from spontaneous activity of the atrium.

Abstract: An active implantable medical device, particularly a cardiac pacemaker, enslaved to at least one physiological parameter. The device is susceptible to function in an enslaved mode by controlling at least one function, particularly that of a cardiac stimulation frequency, based on at least one physiological parameter, and includes at least one effort sensor, measuring a predominantly physiological parameter and delivering an output signal that is a function of the effort developed by a patient bearing the device and at least one activity sensor, especially a sensor having a response time that is more rapid than the effort sensor, for measuring a predominantly physical parameter.

Abstract: An active implantable medical device, notably a cardiac pacemaker or fibrillator, which detects the instantaneous cardiac rhythm, spontaneous or stimulated, of the bearer of the device, and delivers stimulation pulses with a variable escape interval and which increases gradually this escape interval. The gradual increase of the escape interval is obtained by memorizing information corresponding to the evolution of the cardiac rhythm sensed by a conventional detection circuit over a first time period, wherein the escape interval to be adjusted is later in time to the memorized information, notably by determining a variable rate of increase of the escape interval, which variable rate is essentially determined as a function of the memorized information, and/or by operating an integration of the previously detected cardiac rhythm.