Method and apparatus for detecting electrocardiographic abnormalities based on monitored high frequency QRS potentials

Patent metadata

Field	Value
Publication number	US-10342445-B2
Application number	US-201615342443-A
Country	US
Kind code	B2
Filing date	Nov 3, 2016
Priority date	Nov 3, 2016
Publication date	Jul 9, 2019
Grant date	Jul 9, 2019

Abstract

A system and method of monitoring electrocardiogram (ECG) signals and detecting ischemic conditions. In particular, high-frequency components and low-frequency components are extracted from the monitored ECG signal. The high-frequency components are analyzed to detect reduced amplitude zones (RAZs), while the low-frequency components are utilized to detect premature ventricular contraction (PVC) beats. Potentially ischemic conditions are identified based on both RAZs and PVC beats detected.

First claim

The invention claimed is:

1. A method of detecting ischemia, the method comprising:
sensing an electrocardiogram (ECG) signal;
extracting low-frequency components associated with the sensed ECG signal;
detecting premature ventricular contraction (PVC) beats in the low-frequency components;
incrementing a PVC counter in response to each detected PVC beat on a beat-by-beat basis;
extracting high-frequency components associated with the sensed ECG signal, wherein extracting high-frequency components includes extracting high frequency components associated with QRS complex portions of the sensed ECG signal (HF QRS) and rejecting QRS complex portions associated with detected PVC beats;
detecting a reduced amplitude zone (RAZ) in the HF QRS on a beat-by-beat basis;
incrementing a counter in response to each detected RAZ; and
identifying potential ischemia based on the PVC counter and the RAZ counter.

2. The method of claim 1 , wherein extracting high-frequency components includes extracting components in a frequency range of 150-250 Hertz (Hz).

3. The method of claim 1 , further including identifying a HF QRS envelope associated with the HF QRS signal.

4. The method of claim 1 , wherein potential ischemia is identified when both the PVC counter and the RAZ counter exceed threshold values.

5. The method of claim 1 , wherein detecting premature ventricular contraction (PVC) beats in the low-frequency components includes detecting density and/or frequency attributes associated with detected PVC beats.

6. The method of claim 1 , wherein identifying potential ischemia based on detection of both RAZs and PVC beats comprises identifying based on an amount of RAZ beats and an amount of PVC beats.

7. The method of claim 1 , wherein extracting low-frequency components includes extracting components in a frequency range of 0-40 Hertz (Hz).

Assignees

• Medtronic Monitoring Inc

Inventors

• Musley Shaileshkumar V
• Shrivastav Maneesh
• Vilendrer Stacie

Classifications

• A61B5/347

  Detecting the frequency distribution of signals · CPC title

• A61B5/282

  Holders for multiple electrodes (for introduction into the body A61B5/287) · CPC title

• A61B5/349 Primary

  Detecting specific parameters of the electrocardiograph cycle · CPC title

• A61B5/0404

  Human Necessities · mapped topic

• A61B5/0472

  Human Necessities · mapped topic