FAR-FIELD P-WAVE SENSING IN NEAR REAL-TIME FOR TIMING DELIVERY OF PACNG THERAPY IN A CARDIAC MEDICAL DEVICE AND MEDICAL DEVICE SYSTEM

摘要

A medical device system for controlling ventricular pacing therapy during cardiac resynchronization therapy that includes a sensing device to sense a cardiac signal and emit a trigger signal in response to the sensed cardiac signal, a therapy delivery device to deliver the ventricular pacing in response to the emitted trigger signal, and a processor configured to identify a fiducial point of the cardiac signal sensed in real-time, set a window comprising a start point positioned a first distance prior to the fiducial point and an endpoint positioned a second distance less than the first distance subsequent to the fiducial point, determine a signal characteristic of the cardiac signal within the window, determine whether a P-wave is detected in response to the signal characteristic, determine whether an atrio-ventricular interval timer has expired, and emit a trigger signal to deliver the ventricular pacing timed off of the local maximum in response to the P-wave being detected and not timed off of the local maximum in response to the timer being expired.

主权项

1. A medical device system for controlling delivery of a ventricular pacing therapy during cardiac resynchronization therapy, comprising:
a sensing device to sense a cardiac signal and to emit a trigger signal in response to the sensed cardiac signal; a therapy delivery device to receive the trigger signal and deliver the ventricular pacing to the patient in response to the emitted trigger signal; and a processor positioned within the sensing device, the processor configured to identify a fiducial point of the cardiac signal sensed in real-time, set a window comprising a start point positioned a first distance prior to the fiducial point and an endpoint positioned a second distance subsequent to the fiducial point, the second distance being less than the first distance, determine a signal characteristic of the cardiac signal within the window, determine whether a P-wave is detected in response to the signal characteristic, determine whether a timer associated with an atrio-ventricular interval has expired, and emit a trigger signal via the sensing device, the trigger signal being received by the therapy delivery device and instructing the therapy delivery device to deliver the ventricular pacing timed off of the local maximum in response to the P-wave being detected and not timed off of the local maximum in response to the timer being expired.