Multifocal PVC detection for prevention of arrhythmias
First Claim
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1. A method of detecting and preventing ventricular arrhythmias, comprising:
- a. determining an electrogram or electrocardiogram signal;
b. detecting at least two premature ventricular contractions (PVCs);
c. determining a difference between morphologies of the at least two PVCs;
d. comparing said difference to a predetermined morphology threshold using a microprocessor; and
e. delivering preventive therapy based on said comparing step.
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Abstract
Multifocal PVCs are detected and prevented. If the PVCs being detected have variable coupling intervals and significantly different morphologies, they are deemed multifocal and a prevention therapy is activated for a short period of time. In another embodiment, multifocality and the need for prevention therapy are determined based on morphology alone. Feedback mechanisms are used to adjust thresholds for coupling interval and morphology if the PVCs are considered not multifocal, but ventricular arrhythmia still occurs. In an embodiment, only morphologies are compared.
21 Citations
27 Claims
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1. A method of detecting and preventing ventricular arrhythmias, comprising:
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a. determining an electrogram or electrocardiogram signal; b. detecting at least two premature ventricular contractions (PVCs); c. determining a difference between morphologies of the at least two PVCs; d. comparing said difference to a predetermined morphology threshold using a microprocessor; and e. delivering preventive therapy based on said comparing step. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus configured to detect and prevent ventricular arrhythmias, comprising:
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detecting means configured to detect at least two premature ventricular contractions (PVCs); processing means configured to determine a difference between morphologies of each of the at least two PVCs; comparing means configured to compare said difference to a predetermined morphology threshold; and delivering means configured to deliver preventative therapy based on said comparison. - View Dependent Claims (14, 15, 16)
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17. An implantable cardiac device, comprising:
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a sensing circuit configured to sense at least two premature ventricular contractions (PVCs); a comparing circuit configured to compare a difference between morphologies of each of the at least two PVCs to a predetermined morphology threshold; and a pacing circuit configured to deliver preventative therapy based on said comparison. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A method of detecting and preventing ventricular arrhythmias, comprising:
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a. determining an electrogram or electrocardiogram signal; b. detecting at least two premature ventricular contractions (PVCs); c. determining a difference between coupling intervals of the at least two PVCs; d. comparing said difference between coupling intervals to a predetermined coupling interval threshold using a microprocessor; e. determining a difference between morphologies of the at least two PVCs; f. comparing said difference between morphologies to a predetermined morphology threshold using the microprocessor; and g. delivering preventative therapy based on said comparing steps (d) and (f). - View Dependent Claims (24, 25, 26)
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27. A method of detecting and preventing ventricular arrhythmias, comprising:
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a. determining an electrogram or electrocardiogram signal; b. detecting at least two premature ventricular contractions (PVCs); c. comparing said difference between coupling intervals of said at least two PVCs to a coupling interval threshold using a microprocessor; d. repeating steps (a)-(c) when said difference between coupling intervals is less than the coupling interval threshold; e. comparing a difference in morphologies of said at least two PVCs to a morphology threshold when said difference between coupling intervals is greater than the coupling interval threshold using the microprocessor; and f. delivering therapy when said difference in morphologies is greater than the morphology threshold.
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Specification