Method and apparatus for atrial arrhythmia episode detection

摘要

A method and medical device for determining a P-wave of a cardiac signal that includes sensing the cardiac signal, determining a P-wave sensing window in response to the sensed cardiac signal, the P-wave sensing window having a first portion and a second portion, determining signal characteristics of the sensed cardiac signal within the first portion and within the second portion, comparing the determined signal characteristics, and determining the P-wave in response to the comparing.

主权项

1. A method of determining a P-wave of a cardiac signal in an implantable medical device, comprising:
sensing the cardiac signal; identifying one or more R-waves within the cardiac signal; determining one or more P-wave sensing windows, wherein each of the P-wave sensing window is associated with one of the one or more identified R-waves; determining a characteristic P-wave sensing window based on the one or more determined P-wave sensing windows, the characteristic P-wave sensing window having a first portion and a second portion; determining a first derivative signal of the cardiac signal within the characteristic P-wave sensing window; determining a second derivative signal of the cardiac signal within the characteristic P-wave sensing window; analyzing the first derivative and the second derivative of the cardiac signal within the characteristic P-wave window to determine a first set of signal characteristics of the cardiac signal within the first portion of the characteristic P-wave sensing window and a second set of signal characteristics of the cardiac signal within the second portion of the characteristic P-wave sensing window, the signal characteristics including zero crossings of the first derivative signal and amplitudes of the second derivative signal corresponding to the determined zero crossings; and detecting the P-wave based on the first and the second set of signal characteristics.