Medical device system and method for determining His bundle pacing capture

A method performed by an implantable medical device, comprising:

• delivering pacing pulses according to a first pacing output control parameter;
• receiving an indication of confirmed effective or partial His bundle capture during pacing at the pacing output control parameter by receiving the indication as a wirelessly transmitted notification signal;
• in response to receiving the indication of confirmed effective or partial His bundle capture, determining a feature of a cardiac electrical signal sensed by a sensing circuit of the implantable medical device during the confirmed effective or partial His bundle pacing at the pacing output control parameter;
• establishing a corresponding effective or partial His bundle capture detection threshold based on the determined feature of the cardiac electrical signal sensed by the sensing circuit;
• and
• controlling a therapy delivery circuit to maintain capture of at least a portion of the His bundle using the corresponding effective or partial His bundle capture detection threshold.

A non-transitory, computer-readable storage medium comprising a set of instructions which, when executed by a processor of a computing apparatus of a medical device system, cause the computing apparatus to:

• receive body surface electrical signals from an electrode apparatus comprising a plurality of external electrodes;
• generate electrical dyssynchrony data from the body surface electrical signals received from the plurality of external electrodes during delivery of His bundle pacing pulses;
• identify effective or partial His bundle capture based on the electrical dyssynchrony data, wherein the effective or partial His bundle capture comprises capture of both a left bundle branch and a right bundle branch of a His bundle, the left bundle branch only, or the right bundle branch only;
• generate a corresponding indication of effective or partial His bundle capture in response to identifying the effective or partial His bundle capture His bundle capture;
• and
• transmit the indication of effective or partial His bundle capture as a wirelessly transmitted notification signal to an implantable medical device configured to receive the wirelessly transmitted notification signal and establish an effective or partial His bundle capture detection threshold in response to receiving the wirelessly transmitted notification signal.