A pressure capsule embedded in a pacemaker lead to monitor intracardiac chamber pressure is described. In use, at least a portion of the part of the lower portion of the first tube is subjected to a given temperature while the second tube is subjected to a different temperature. The retry count is incremented upon failure of each attempt to communicate with the headend within the upstream path. During use, the latch member is rotated about its first pivot axis via the lever arm in an extended position, whereby the latching member is securely coupled to a frame member via its clasp.