Method and System for Detecting Capture with Cancellation of Pacing Artifact

A medical device, comprising:

• electrodes configured to electrically couple to a heart;
• pulse generator circuitry coupled to the electrodes and configured to provide stimulation pulses to the heart at a plurality of pulse amplitudes;
• sensing circuitry configured to sense cardiac electrical signals following the stimulation pulses;
• template circuitry configured to form pacing artifact templates associated with the plurality of pulse amplitudes;
• and
• a capture detector configured to cancel a pacing artifact template of the plurality of pacing artifact templates from a cardiac signal sensed following a stimulation pulse and to detect capture of the heart using the pacing artifact cancelled cardiac signal.

A medical device, comprising:

• electrodes configured to electrically couple to the heart;
• pulse generator circuitry coupled to the electrodes and configured to provide stimulation pulses at a plurality of pulse amplitudes to the heart via the electrodes;
• sensing circuitry configured to sense cardiac electrical signals following the stimulation pulses;
• means for forming pacing artifact templates associated with the plurality of pulse amplitudes;
• means for canceling a pacing artifact template of the plurality of pacing artifact templates from a cardiac signal sensed following a stimulation pulse and detecting capture of the heart using the pacing artifact cancelled cardiac signal.