Cardiac monitoring system with normally conducted QRS complex identification
AssigneeWest Affum Holdings DAC
InventorJaeho Kim
Life of this patent
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Abstract
In one example, a cardiac monitoring system, comprises a processor to receive a segment of an electrocardiogram (ECG) signal of a patient, and a memory to store the segment of the ECG. The processor is configured to identify QRS complexes in the segment of the ECG signal, compare the QRS complexes in the segment to the other QRS complexes in the segment to identify a main template QRS complex, identify the QRS complexes in the segment that are similar to the main template, determine RR intervals between consecutive similar QRS complexes to calculate RR variability in the RR intervals, and detect atrial fibrillation (AF) in the segment when RR variability is greater than a threshold value. Other examples and related methods are also disclosed herein.
Claims17
A cardioverter defibrillator system, comprising:
- a support structure;
- a plurality of electrocardiogram (ECG) electrodes coupled to the support structure and configured to couple to a body of a patient;
- a processor to receive multiple segments of multiple ECG signals of the patient, wherein the multiple ECG signals are received from multiple ECG channels from the plurality of ECG electrodes;
- a memory to store the segments of the ECG signals,
- wherein the processor is configured to:
- detect QRS complexes in the multiple segments of the multiple ECG signals;
- compare the detected QRS complexes in the multiple segments with one or more templates to identify a main template;
- compute a correlation value between each of the detected QRS complexes and the main template;
- identify one or more QRS complexes, among the detected QRS complexes, having a correlation value exceeding a correlation threshold value as supraventricular (SV) complexes:
- determine RR intervals between consecutive SV complexes to calculate RR variability in the RR interval;
- and
- detect atrial fibrillation (AF) in the segments when the RR variability is greater than a threshold value;
- a plurality of defibrillation electrodes configured to couple to the body of the patient;
- and
- a high voltage subsystem to:
- apply a defibrillation voltage across the plurality of defibrillation electrodes to provide therapeutic shocks to the patient when a shockable rhythm is detected, and
- inhibit provision of the therapeutic shocks to the patient in response to a determination that the AF is detected as non-shockable.
A wearable cardiac monitor (WCM), comprising:
- a support structure configured to be worn by a patient;
- a plurality of electrocardiogram (ECG) electrodes coupled to the support structure and configured to couple to a body of the patient;
- a processor to receive multiple segments of multiple ECG signals of the patient, wherein the multiple ECG signals are received from multiple ECG channels from the plurality of ECG electrodes;
- a memory to store the segments of the ECG signals,
- wherein the processor is configured to:
- detect QRS complexes in the multiple segments of the multiple ECG signals;
- compare the detected QRS complexes in the multiple segments with one or more templates to identify a main template;
- compute a correlation value between each of the detected QRS complexes and the main template;
- identify one or more QRS complexes, among the detected QRS complexes, having a correlation value exceeding a correlation threshold value as supraventricular (SV) complexes;
- determine RR intervals between consecutive SV complexes to calculate RR variability in the RR intervals;
- detect an arrhythmia in the segments when the RR variability is greater than a threshold value;
- and
- distinguish between atrial fibrillation (AF) or supraventricular tachycardia (SVT) and ventricular tachycardia (VT) or ventricular fibrillation (VF) for the detected arrhythmia, wherein the detected arrythmia is determined to be shockable when VT or VF is detected in the segments;
- a plurality of defibrillation electrodes configured to couple to the body of the patient;
- and
- a high voltage subsystem to:
- apply a defibrillation voltage across the plurality of defibrillation electrodes to provide therapeutic shocks to the patient when the detected arrythmia is determined to be shockable, and
- inhibit provision of the therapeutic shocks to the patient in response to a determination that the AF is detected as a non-shockable arrhythmia.
Dependencies are inferred from the claim text.