ATP therapy for tachyarrhythmias in VF zone
First Claim
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1. A method for delivering anti-tachyarrhythmia therapy, comprising:
- generating an electrogram signal representing electrical activity in a ventricle;
detecting ventricular senses and measuring a time interval between ventricular senses (RR intervals) to determine a current ventricular rate;
detecting a ventricular tachyarrhythmia when the ventricular rate exceeds a specified tachycardia detection rate (TDR);
upon detection of a ventricular tachyarrhythmia, delivering anti-tachycardia pacing (ATP) therapy if the ventricular rate is below a fibrillation detection rate (FDR);
upon detection of a ventricular tachyarrhythmia and if the ventricular rate is above the FDR, determining if a specified number of beats during the tachyarrhythmia meet a specified rate stability criterion and a specified monomorphic morphology criterion;
if the specified rate stability and monomorphic morphology criteria are met, delivering anti-tachycardia pacing (ATP) therapy; and
, if the specified rate stability and monomorphic morphology criteria are not met, delivering shock therapy.
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Abstract
A method and apparatus for delivering therapy to treat ventricular tachyarrhythmias is described. A ventricular tachyarrhythmia can be classified into tachycardia or fibrillation zones using a rate criterion so that the tachyarrhythmia can be treated with either anti-tachycardia pacing or shock therapy, respectively. Rate stability and morphology criteria are employed to determine if a tachyarrhythmia in the fibrillation zone is actually monomorphic ventricular tachycardia which can be treated with ATP.
54 Citations
20 Claims
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1. A method for delivering anti-tachyarrhythmia therapy, comprising:
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generating an electrogram signal representing electrical activity in a ventricle;
detecting ventricular senses and measuring a time interval between ventricular senses (RR intervals) to determine a current ventricular rate;
detecting a ventricular tachyarrhythmia when the ventricular rate exceeds a specified tachycardia detection rate (TDR);
upon detection of a ventricular tachyarrhythmia, delivering anti-tachycardia pacing (ATP) therapy if the ventricular rate is below a fibrillation detection rate (FDR);
upon detection of a ventricular tachyarrhythmia and if the ventricular rate is above the FDR, determining if a specified number of beats during the tachyarrhythmia meet a specified rate stability criterion and a specified monomorphic morphology criterion;
if the specified rate stability and monomorphic morphology criteria are met, delivering anti-tachycardia pacing (ATP) therapy; and
,if the specified rate stability and monomorphic morphology criteria are not met, delivering shock therapy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A cardiac device, comprising:
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a sensing channel for generating an electrogram signal representing electrical activity in a ventricle;
a pacing channel for delivering anti-tachycardia pacing (ATP) to a ventricle;
a shocking channel for delivering shock therapy to a ventricle;
a controller, wherein the controller is programmed to;
detect ventricular senses and measure a time interval between ventricular senses (RR intervals) to determine a current ventricular rate;
detect a ventricular tachyarrhythmia when the ventricular rate exceeds a specified tachycardia detection rate (TDR);
upon detection of a ventricular tachyarrhythmia, deliver anti-tachycardia pacing (ATP) therapy if the ventricular rate is below a fibrillation detection rate (FDR);
upon detection of a ventricular tachyarrhythmia and if the ventricular rate is above the FDR, determine if a specified number of beats during the tachyarrhythmia meet a specified rate stability criterion and a specified monomorphic morphology criterion;
if the specified rate stability and monomorphic morphology criteria are met, deliver anti-tachycardia pacing (ATP) therapy; and
,if the specified rate stability and monomorphic morphology criteria are not met, deliver shock therapy. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification