Patent ID: 8326423

Claim:
An apparatus comprising: a catheter arrangement configured for use in capturing myocardium of a heart, the catheter arrangement comprising: a fixation mechanism to attach the catheter arrangement to heart tissue at a target region in a right ventricle of the heart at or near the His bundle and distal from an apex of the right ventricle; individually-addressable electrodes for providing pacing signals to different portions within the target region of the heart tissue; and an elongated structure to support the fixation mechanism and the individually-addressable electrodes, and direct an end of the elongated structure to the target region in the right ventricle; and a pulse generation circuit electrically coupled to the individually-addressable electrodes and configured to generate pacing signals for delivery to the heart via the individually-addressable electrodes, the pacing signals comprising at least partially overlapping opposite polarity signals, and wherein the pulse generation circuit is configured to change the pacing signals from a first mode to a second mode responsive to the fixation mechanism being attached to the heart tissue.