Methods, devices and systems for improving R-wave detection and arrhtymia detection accuracy

A device, comprising:

• one or more electrodes;
• a sensing circuitry coupled to the one or more electrodes and configured to obtain a signal indicative of cardiac electrical activity;
• and
• at least one of a processor or controller configured to
• detect a potential R-wave within the signal indicative of cardiac electrical activity;
• determine a measure of magnitude of a first portion of the signal corresponding to a first window that follows the potential R-wave;
• determine the measure of magnitude of a second portion of the signal corresponding to a second window that follows the first window;
• determine whether the measure of magnitude of the second portion of the signal is at least a specified extent larger than the measure of magnitude of the first portion of the signal;
• and
• classify the potential R-wave as a false R-wave, in response to determining that the measure of magnitude of the second portion of the signal is at least the specified extent larger than the measure of magnitude of the first portion of the signal.

A method, comprising:

• detecting potential R-waves within a signal indicative of cardiac electrical activity, wherein each of the potential R-waves is associated with a respective temporal R-wave marker;
• monitoring for a potential episode of an arrhythmia based on the potential R-waves;
• in response to detecting a potential episode of the arrhythmia, for each potential R-wave of a plurality of the potential R-waves within a segment of the signal leading up to the potential episode of the arrhythmia, selectively adjusting the respective temporal R-wave marker for the potential R-wave by
• (i) determining a measure of magnitude of a first portion of the signal corresponding to a first window that follows the respective R-wave marker for the potential R-wave;
• (ii) determining the measure of magnitude of a second portion of the signal corresponding to a second window that follows the first window;
• (iii) determining whether the measure of magnitude of the second portion of the signal is at least a specified extent larger than the measure of magnitude of the first portion of the signal;
• and
• (iv) in response to determining that the measure of magnitude of the second portion of the signal is at least the specified extent larger than the measure of magnitude of the first portion of the signal, adjusting the respective temporal R-wave marker for the potential R-wave to coincide with a temporal position within the respective second window that follows the potential R-wave;
• and
• in response to adjusting the respective temporal R-wave markers for at least a threshold number of potential R-waves within the segment of the signal, using the adjusted temporal R-wave markers to determine whether the detection of the potential episode of the arrhythmia was a false positive detection.