A cardiac rhythm management system recognizes patterns of interval durations, distinguishing between events in different heart chambers even though signals associated with those different heart chambers are processed using a commonly shared sensing circuit. The electrical connection includes an electrical connector for connecting electrical cables or wires that includes seals which are disposed in grooves in the threaded portions of the electrical connector. Carrier is designed to practically surround the chip, and has a thickness about equal to the chip thickness. The third transistor includes a fifth sourcedrain coupled to an output terminal, a third gate coupled to the second sourcedrain and a sixth sourcedrain coupled to a clock signal to start outputting the pulse signal. The lower part has a lateral width greater than that of the upper and middle parts to thereby form laterally projecting portions for receiving occupant’s arms.