Fast post-antitachycardia pacing redetection algorithm
First Claim
1. A method comprising:
- detecting a ventricular tachycardia heart rhythm in a patient using an implantable medical device (IMD);
providing anti-tachycardia pacing (ATP) therapy to the patient in response to the ventricular tachycardia heart rhythm;
in response to the ATP therapy ending, determining an efficacy of the ATP therapy using the IMD by;
waiting a first time duration after the ATP therapy ends during which time sensed ventricular depolarizations are ignored, wherein the first time duration exceeds first and second tachycardia detection threshold interval values;
establishing a redetection time duration after the first time duration has elapsed;
monitoring the ventricular depolarizations during the redetection duration, wherein the monitoring includes;
measuring time intervals between the ventricular depolarizations;
determining if a specified consecutive number of the intervals between the ventricular depolarizations are shorter than the first tachycardia detection threshold interval value, and, if so, then deeming that the ventricular tachycardia rhythm persists; and
concurrently determining if, during the same redetection duration, a predetermined fraction of the consecutive intervals between the ventricular depolarizations are shorter than the second tachycardia detection threshold interval value that is different than the first threshold interval value, and, if so, then deeming that the ventricular tachycardia heart rhythm persists, wherein the fraction is less than 100%, otherwise,providing an indication of efficacy of the ATP therapy indicating whether the ventricular tachycardia rhythm is converted.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
25 Claims
-
1. A method comprising:
-
detecting a ventricular tachycardia heart rhythm in a patient using an implantable medical device (IMD); providing anti-tachycardia pacing (ATP) therapy to the patient in response to the ventricular tachycardia heart rhythm; in response to the ATP therapy ending, determining an efficacy of the ATP therapy using the IMD by; waiting a first time duration after the ATP therapy ends during which time sensed ventricular depolarizations are ignored, wherein the first time duration exceeds first and second tachycardia detection threshold interval values; establishing a redetection time duration after the first time duration has elapsed; monitoring the ventricular depolarizations during the redetection duration, wherein the monitoring includes; measuring time intervals between the ventricular depolarizations; determining if a specified consecutive number of the intervals between the ventricular depolarizations are shorter than the first tachycardia detection threshold interval value, and, if so, then deeming that the ventricular tachycardia rhythm persists; and concurrently determining if, during the same redetection duration, a predetermined fraction of the consecutive intervals between the ventricular depolarizations are shorter than the second tachycardia detection threshold interval value that is different than the first threshold interval value, and, if so, then deeming that the ventricular tachycardia heart rhythm persists, wherein the fraction is less than 100%, otherwise, providing an indication of efficacy of the ATP therapy indicating whether the ventricular tachycardia rhythm is converted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A system, comprising:
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; and a controller coupled to the signal sensing circuit and the therapy circuit, wherein the controller; detects a ventricular tachycardia heart rhythm from the cardiac signal; initiates anti-tachycardia pacing (ATP) therapy to the patient in response to the ventricular tachycardia heart rhythm and, in response to the ATP therapy ending and in order to determine an efficacy of the APT therapy; waits a first time duration after the ATP therapy ends during which time sensed ventricular depolarizations are ignored, wherein the first time duration exceeds first and second tachycardia detection threshold interval values; initiates a redetection time duration after the first time duration expires; measures time intervals between ventricular depolarizations after providing ATP therapy and during the redetection time duration; compares the intervals to the first tachycardia detection threshold interval value; and determines if a consecutive number of the intervals are shorter than the first threshold interval value, and, if so, then deems that the ventricular tachycardia rhythm persists, and concurrently determines if, during the same redetection time duration, a predetermined fraction of the consecutive intervals are shorter than the second tachycardia detection threshold interval value that is different than the first threshold interval value, and if so, then deems that the ventricular tachycardia heart rhythm persists, wherein the predetermined fraction is less than 100%, otherwise provides an indication of efficacy of the ATP therapy indicating whether the ventricular tachycardia heart rhythm is converted. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
22. A method comprising:
-
measuring first time intervals between ventricular depolarizations of a heart during a tachyarrhythmia detection time duration, the measuring including using an implantable medical device (IMD); measuring both a ventricular depolarization rate and an atrial depolarization rate of the heart; determining if a specified consecutive number of intervals between the ventricular depolarizations are shorter than a first tachycardia detection threshold interval value and, if so, then deeming that a ventricular tachycardia rhythm exists; concurrently determining if, during the same tachyarrhythmia detection time duration, a predetermined fraction of the consecutive intervals between the ventricular depolarizations are shorter than a second tachycardia detection threshold interval value that is different than the first threshold interval value, and, if so, then deeming that the ventricular tachycardia heart rhythm exists, wherein the fraction is less than 100%; and concurrently determining if, during the same tachyarrhythmia detection time duration, the ventricular rate exceeds the atrial rate by a threshold rate difference value and, if so, then deeming that the ventricular tachycardia heart rhythm exists, otherwise deeming that the ventricular tachycardia heart rhythm does not exist; initiating ATP therapy if deeming that the ventricular tachycardia heart rhythm exists; in response to the ATP therapy ending, determining an efficacy of the ATP therapy using the IMD by; waiting a first time duration after the ATP therapy ends, wherein the first time duration exceeds both the first and second tachycardia detection threshold interval values, and wherein during the first time duration any sensed ventricular depolarizations are ignored; and initiating a tachyarrhythmia redetection time period after the first time duration elapses; and providing an indication of efficacy of the ATP therapy indicating whether the ventricular tachycardia is converted. - View Dependent Claims (23, 24, 25)
-
Specification