Pacing method

A method for delivering physiological pacing, the method comprising the steps of:

• inserting a single electrode or a pair of electrodes into an interventricular septal zone, which is in proximity to the bundle of His where pacing stimulation results in a rhythm breaking out at an intrinsic location;
• positioning the single electrode or pair of electrodes at one or more positions within the septal zone;
• sensing by means of the single electrode or pair of electrodes at the one or more positions;
• measuring a P-wave amplitude and an R-wave amplitude sensed at each position;
• pacing by means of the single electrode or pair of electrodes at the one or more positions;
• measuring a pacing threshold of the single electrode or pair of electrodes at each position;
• selecting from the one or more positions an electrode implant site where a ratio of P-wave amplitude to R-wave amplitude is less than approximately 0.5 and the pacing threshold is less than or equal to approximately 1.5 volts;
• and
• implanting the single electrode or pair of electrodes at the selected site to deliver physiological pacing.