US 12,642,473 B2 · Methods and apparatuses to detect tachycardias and selectively reject tachycardia detections

Abstract

Described herein are apparatuses and methods to detect tachycardias and selectively reject false tachycardia detections due to T-wave oversensing or noise. An apparatus includes electrodes, a sensing circuit coupled to at least two of the electrodes and configured to sense a signal indicative of cardiac electrical activity, and a smoothing filter configured to filter to the sensed signal indicative of cardiac electrical activity to thereby produce a filtered signal indicative of cardiac electrical activity. The apparatus produces a difference signal indicative of cardiac electrical activity by determining a difference between the sensed and filtered signals indicative of cardiac electrical activity. The apparatus also includes at least one processor configured to detect a tachycardia, or to determine whether or not to reject a tachycardia detection, based on the difference signal. The smoothing filter and/or difference circuitry can be implemented by the at least one processor, and/or other circuitry.

Claims23

Dependent claims

An apparatus, comprising:

a plurality of electrodes;
a sensing circuit coupled to at least two of the electrodes and configured to sense a signal indicative of cardiac electrical activity;
at least one processor configured to detect R-waves based on the sensed signal indicative of cardiac electrical activity and detect a tachycardia based on the R-waves;
a smoothing filter configured to filter the sensed signal indicative of cardiac electrical activity to thereby produce a filtered signal indicative of cardiac electrical activity;
and
difference circuitry configured to produce a difference signal indicative of cardiac electrical activity by determining a difference between the sensed signal indicative of cardiac electrical activity that has not been filtered by the smoothing filter and the filtered signal indicative of cardiac electrical activity that has been filtered by the smoothing filter;
and
the at least one processor also configured to redetect R-waves based on the difference signal in response to the tachycardia detection, and determine based on the redetected R-waves whether or not to reject the tachycardia detection.

5 more elements

A method, comprising:

(a) obtaining a sensed signal indicative of cardiac electrical activity;
(b) detecting R-waves based on the sensed signal indicative of cardiac electrical activity;
(c) detecting a tachycardia based on the R-waves;
(d) producing a filtered signal indicative of cardiac electrical activity by applying a smoothing filter to the sensed signal indicative of cardiac electrical activity;
(e) producing a difference signal indicative of cardiac electrical activity by determining a difference between the sensed signal indicative of cardiac electrical activity that has not been filtered by the smoothing filter and the filtered signal indicative of cardiac electrical activity that has been filtered by the smoothing filter;
(f) in response to the tachycardia being detected, redetecting R-waves based on the difference signal;
and
(g) determining whether or not to reject the tachycardia detection based on the redetected R-waves.

5 more elements

Dependencies are inferred from the claim text.

Methods and apparatuses to detect tachycardias and selectively reject tachycardia detections

Life of this patent

Methods and apparatuses to detect tachycardias and selectively reject tachycardia detections

Life of this patent

Abstract

Claims23