Fast post-antitachycardia pacing redetection algorithm
First Claim
1. A method comprising:
- detecting a ventricular tachycardia heart rhythm in a patient;
providing anti-tachycardia pacing (ATP) therapy to the patient in response to the ventricular tachycardia heart rhythm;
waiting a first time duration after the ATP therapy ends;
monitoring ventricular depolarizations after the first time duration has elapsed, wherein the monitoring includes measuring time intervals between the ventricular depolarizations; and
if a consecutive number of the intervals between the ventricular depolarizations are shorter than a first threshold interval value, then deeming that the ventricular tachycardia rhythm persists, otherwise, if a fraction of the intervals between the ventricular depolarizations are shorter than a second threshold interval value, then deeming that the ventricular tachycardia heart rhythm persists, otherwise, deeming that the ventricular tachycardia rhythm is converted.
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Abstract
A method comprising detecting a ventricular tachycardia heart rhythm in a patient, providing anti-tachycardia pacing (ATP) therapy to the patient in response to the ventricular tachycardia heart rhythm, waiting a first time duration after the ATP therapy ends, and monitoring ventricular depolarizations after the first time duration has elapsed. The monitoring includes measuring time intervals between the ventricular depolarizations, and if a consecutive number of the intervals between the ventricular depolarizations are shorter than a first threshold interval value, then the method includes deeming that the ventricular tachycardia rhythm persists. Otherwise, if a fraction of the intervals between the ventricular depolarizations are shorter than a second threshold interval value, then the method includes deeming that the ventricular tachycardia heart rhythm persists, and otherwise deeming that the ventricular tachycardia rhythm is converted.
103 Citations
26 Claims
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1. A method comprising:
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detecting a ventricular tachycardia heart rhythm in a patient;
providing anti-tachycardia pacing (ATP) therapy to the patient in response to the ventricular tachycardia heart rhythm;
waiting a first time duration after the ATP therapy ends;
monitoring ventricular depolarizations after the first time duration has elapsed, wherein the monitoring includes measuring time intervals between the ventricular depolarizations; and
if a consecutive number of the intervals between the ventricular depolarizations are shorter than a first threshold interval value, then deeming that the ventricular tachycardia rhythm persists, otherwise, if a fraction of the intervals between the ventricular depolarizations are shorter than a second threshold interval value, then deeming that the ventricular tachycardia heart rhythm persists, otherwise, deeming that the ventricular tachycardia rhythm is converted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system, comprising:
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an implantable medical device comprising;
a signal sensing circuit coupled to at least one electrode, the electrode located to sense a cardiac signal of a ventricle of a heart of a patient;
a therapy circuit;
a timer circuit; and
a controller coupled to the signal sensing circuit, the timer circuit, and the therapy circuit, wherein the controller is operable in;
detecting a ventricular tachycardia heart rhythm from the cardiac signal;
initiating anti-tachycardia pacing (ATP) therapy to the patient in response to the ventricular tachycardia heart rhythm;
measuring time intervals between ventricular depolarizations after providing ATP therapy;
comparing the intervals to a threshold interval value; and
if a consecutive number of the intervals are shorter than the threshold interval value, then deeming that the ventricular tachycardia rhythm persists, otherwise, if a fraction of the intervals are shorter than the threshold interval value, then deem that the ventricular tachycardia heart rhythm persists, otherwise deem that the ventricular tachycardia heart rhythm is converted. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method comprising:
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measuring first time intervals between ventricular depolarizations of a heart, the measuring including using an implantable medical device;
measuring both a ventricular depolarization rate and an atrial depolarization rate of the heart; and
if a consecutive number of intervals between the ventricular depolarizations are shorter than a threshold interval value, then deeming that a ventricular tachycardia rhythm exists, otherwise, if a fraction of the intervals between the ventricular depolarizations are shorter than the threshold interval value, then deeming that the ventricular tachycardia heart rhythm exists, otherwise, if the ventricular rate exceeds the atrial rate by a threshold rate difference value then deeming that the ventricular tachycardia heart rhythm exists, otherwise deeming that the ventricular tachycardia heart rhythm does not exist. - View Dependent Claims (24, 25, 26)
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Specification