Abstract: This pacing system relates to a rate varying cardiac pacemaker (1) for electricaly stimulating the heart of a pacemaker wearer. The electrical cardiogenic heart is detected on a multipolar single probe with the aid of individual electrodes (7 to 10). Bipolar electrodes in the atrium allows for detection of the intra-atrial actions (P-wave) as a first rate control signal for controlling the pacemaker in the atrially triggered ventricular pacing mode (VDD). A second rate control signal other than the P-wave correlating with patient activity is determined in parallel with the P-wave control signal. The two control signals are compared to decide if the intra atrial actions (P-waves) are appropriate control signals. Pace rate control is switched between the two signals in order to produce the most beneficial pacing mode to the patient, for example, VDD or VVI rate responsive modes.

Abstract: An implant medical device system with an implant lead system e.g. a heart pacing probe system, connectable thereto provides for at least three implant leads to be connected by a single plug-socket assembly to the medical device system, e.g. a pacemaker. Two contacts on the outside of a connector of this invention form respective electrical contacts with contact areas on a socket made to acceptable medical industry approved structures for bipolar connection systems and feature identical outer diameters. The additional contacts are formed in a way that a pin is mounted in the socket and protrudes into the inner lumen of the connector making additional contacts on the inner side of the central lumen within the connector. Appropriate sealing means ensure the adequate insulation for the additional contacts. The total size of this multicontact connection system stays within the limits of a standard bipolar system, and is interchangable with standard bipolar connection means.