A system including a catheter configured to capture myocardium of a heart by delivering pacing signals to a location in the heart, the location near a His Bundle of the Heart, the catheter comprising: a proximal end configured for interfacing with an electrical pacing signal source, and a distal end sized and shaped to be located in a right ventricle at or near a septum at or near the bundle of His, the distal end including a fixation mechanism that attaches the catheter to heart tissue; and a first electrode and a second electrode, each individually addressable for providing pacing signals to the heart tissue and each located at a distal end face of the catheter and arranged facing longitudinally outward from the distal end face of the catheter to physically contact the heart tissue when the fixation mechanism is attached to the heart tissue; the system further comprising the electrical pacing signal source configured for providing unipolar, bipolar, and Xstim pacing modes, the Xstim pacing mode including at least partially concurrent opposite polarity pacing signals characterised in that the polarity of the signals is alternated beat by beat, the electrical pacing signal source comprising: a first switch for selecting unipolar, bipolar, or Xstim pacing modes; a second switch for selectively coupling a pacing voltage source and the second electrode; and a third switch for selectively coupling the pacing voltage source and the first electrode; wherein the second switch is open and the third switch is toggled in the bi-polar pacing mode and wherein the second switch and the third switch are toggled simultaneously in the Xstim pacing mode. a proximal end configured for interfacing with an electrical pacing signal source, and a distal end sized and shaped to be located in a right ventricle at or near a septum at or near the bundle of His, the distal end including a fixation mechanism that attaches the catheter to heart tissue; and a first electrode and a second electrode, each individually addressable for providing pacing signals to the heart tissue and each located at a distal end face of the catheter and arranged facing longitudinally outward from the distal end face of the catheter to physically contact the heart tissue when the fixation mechanism is attached to the heart tissue; the system further comprising the electrical pacing signal source configured for providing unipolar, bipolar, and Xstim pacing modes, the Xstim pacing mode including at least partially concurrent opposite polarity pacing signals characterised in that the polarity of the signals is alternated beat by beat, the electrical pacing signal source comprising: a first switch for selecting unipolar, bipolar, or Xstim pacing modes; a second switch for selectively coupling a pacing voltage source and the second electrode; and a third switch for selectively coupling the pacing voltage source and the first electrode; wherein the second switch is open and the third switch is toggled in the bi-polar pacing mode and wherein the second switch and the third switch are toggled simultaneously in the Xstim pacing mode. a first switch for selecting unipolar, bipolar, or Xstim pacing modes; a second switch for selectively coupling a pacing voltage source and the second electrode; and a third switch for selectively coupling the pacing voltage source and the first electrode; wherein the second switch is open and the third switch is toggled in the bi-polar pacing mode and wherein the second switch and the third switch are toggled simultaneously in the Xstim pacing mode.