Patent ID: 9345890
Filing Date: 2016-05-24
CPC Classification: A61B,A61N,G06K

Claim Text:
1. A method for processing atrial electrical signals obtained from a patient comprising: gathering a first set of atrial electrical signals within the patient using an implantable medical device during an atrial pacing threshold test, the first set of electrical signals comprising a set of samples of electrical activity from a discrete sample time window spanning a pacing event, wherein the sample time window starts in response to an electrical stimulation p acing pulse; filtering the first set of atrial signals to provide a second set of electrical signals, the second set of electrical signals comprising frequencies above a cutoff frequency; estimating the amount of noise present in the first set of atrial electrical signals based on the magnitude of the second set of electrical signals; calculating a noise threshold value according to a capture detection threshold; discarding the first set of atrial electrical signals if the estimated amount of noise exceeds the noise threshold value; calculating an updated noise adjusted pace artifact threshold based on the estimated amount of noise if the noise does not exceed the noise threshold value; comparing the updated noise adjusted pace artifact threshold to the noise threshold value; and when the updated noise adjusted pace artifact threshold is less than the noise threshold value, classifying the electrical signal as loss of capture or fusion.