Tachyarrhythmia detection, differentiation and assessment

• US 20090043218A1
• Filed: 08/06/2008
• Published: 02/12/2009
• Est. Priority Date: 08/07/2007
• Status: Abandoned Application

• Current Assignee: Inovise Medical, Inc.
• Original Assignee: Inovise Medical, Inc.
• Inventors: Arand, Patricia A., Bauer, Peter T., Warner, Robert A.
• Application Number:
  US12/221,845
• Publication Number:
  US 20090043218A1
• Time in Patent Office: Days
• US Class Current: 600/516
• CPC Class Codes: A61B 5/363 Detecting tachycardia or bradycardia
• CPC Class Codes: A61B 7/00 Instruments for auscultation

Abstract

A method employable during a tachycardia-tachyarrhythmia condition in a person for detecting, verifying and distinguishing ventricular and supra-ventricular tachyarrhythmias, including ventricular fibrillation, including (a) confirming the presence of a tachyarrhythmia heart rate, (b) on such confirmation, collecting time-frame-simultaneous ECG and heart-sound information, (c) following such collecting, choosing selected ECG time-span, and heart-sound intensity, data, and (d) utilizing the chosen, selected ECG time-span, and heart-sound intensity, data, characterizing the defined condition as resulting from one of (a) supra-ventricular tachyarrhythmia, (b) ventricular tachyarrhythmia, and (c) ventricular fibrillation.

Claims

1. A method employable during a defined tachycardia-tachyarrhythmia condition extant in a person for detecting, verifying and distinguishing ventricular and supra-ventricular tachyarrhythmias, including ventricular fibrillation, comprising

obtaining, from the person, heart-rate information to confirm the presence of such a defined condition,

on such confirmation, collecting, from the person, time-frame-simultaneous ECG and heart-sound information,

following said collecting, choosing selected ECG time-span, and heart-sound intensity, data, and

utilizing the chosen, selected ECG time-span, and heart-sound intensity, data, characterizing the defined condition as resulting from one of (a) supra-ventricular tachyarrhythmia, (b) ventricular tachyarrhythmia, and (c) ventricular fibrillation.

2. The method of claim 1, wherein said choosing of selected ECG time-span data includes choosing QRS interval data.

3. The method of claim 1, wherein said choosing of selected heart-sound intensity data includes choosing (a) S1 heart-sound, per-occurrence, intensity data and (b) S1 heart-sound, heart-beat-to-heart-beat, intensity-variation data.

4. The method of claim 3, wherein said choosing of selected ECG time-span data includes choosing QRS interval data.

5. The method of claim 4, wherein said choosing further includes identifying QS1 interval data, and said characterizing takes into account also such QS1 interval data.

6. The method of claim 5, wherein said characterizing is performed automatically by a computer.

7. The method of claim 5, wherein said characterizing involves utilizing statistical Z-scores in relation to the QRS interval data, the S1 heart-sound intensity data, the S1 heart-sound intensity-variation data, and the QS1 interval data.

8. The method of claim 1, wherein said choosing further includes identifying QS1 interval data, and said characterizing takes into account also such QS1 interval data.

9. The method of claim 8, wherein said characterizing involves utilizing statistical Z-scores in relation to the ECG time-span data, the heart-sound intensity data, and the QS1 interval data.

10. A method employable during a defined tachycardia-tachyarrhythmia condition extant in a person for detecting, verifying and distinguishing ventricular and supra-ventricular tachyarrhythmias, including ventricular fibrillation, comprising

collecting, from the person, time-frame-simultaneous ECG and heart-sound information,

from the collected ECG information, determining whether the QRS interval in each heartbeat is different from normal,

from the collected heart-sound information, determining whether the S1 heart-sound intensities are at least one of (a) different from normal, and (b) irregular from heartbeat-to-heartbeat,

from the combined, collected ECG and heart-sound information, determining whether the QS1 interval in each heart beat is different from normal, and

utilizing combinedly the results of said three determining steps, characterizing the defined condition as resulting from one of (a) supra-ventricular tachyarrhythmia, (b) ventricular tachyarrhythmia, and (c) ventricular fibrillation.

11. The method of claim 10, wherein said determining, insofar as normalcy of the QRS interval is concerned, involves assessing whether the QRS interval in each heartbeat is longer than normal.

12. The method of claim 10, wherein said determining, insofar as normalcy of the S1 heart-sound intensity is concerned, involves assessing whether S1 heart-sound intensities are lower than normal.

13. The method of claim 10, wherein said determining, insofar as normalcy of the QS1 interval is concerned, involves assessing whether the QS1 interval in each heart beat is longer than normal.