Apparatus and method for antitachycardia pacing in dual chamber arrhythmia control system
First Claim
1. A dual chamber antitachycardia pacing device for the reversion of tachycardias in a heart comprising:
- means for detecting tachycardia, means for measuring cycle length of said tachycardia, means for determining a VA interval value less than or equal to the tachycardia cycle length, means for determining an initial value AV delay interval, pulse generating means responsive to said tachycardia detecting means for generating heart stimulating pulses for the atrium and for the ventricle, said pulse generating means including means for delivering a series of M pulse trains with each train consisting of a total of 2N pacing pulses delivered in an alternating sequence to the ventricle and to the atrium, so that timing of said delivered pulses is in accordance with the values of the VA interval and the AV interval, whereby each train comprises the delivery of a pacing pulse to the atrium at the expiration of each of N VA delay intervals and a pacing pulse to the ventricle at the expiration of each of N AV delay intervals, and means for varying said AV delay interval from said programmed initial value at least once prior to completion of said series of M pulse trains.
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Accused Products
Abstract
Apparatus and method of antitachycardia pacing in a duel chamber pacing device including means for or steps of detecting the presence of a tachycardia, measuring the tachycardia cycle length, determining a VA interval value less than or equal to the tachycardia cycle length, determining an initial value of the AV delay interval, delivering pulses to the ventricle and to the atrium until the expiration of N VA intervals and N AV intervals thereby completing a first train of pulses, delivering a series of M trains of pulses similar to said first train pulses, and varying the AV delay interval value from the initial value at least once prior to the completion of the series of M trains of pulses. Monitoring of instrinsic QRS complexes between pulse trains is performed. If the tachyarrhythmia is deemed to be accelerating, one of cardioversion or defibrillation may be applied.
169 Citations
48 Claims
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1. A dual chamber antitachycardia pacing device for the reversion of tachycardias in a heart comprising:
- means for detecting tachycardia, means for measuring cycle length of said tachycardia, means for determining a VA interval value less than or equal to the tachycardia cycle length, means for determining an initial value AV delay interval, pulse generating means responsive to said tachycardia detecting means for generating heart stimulating pulses for the atrium and for the ventricle, said pulse generating means including means for delivering a series of M pulse trains with each train consisting of a total of 2N pacing pulses delivered in an alternating sequence to the ventricle and to the atrium, so that timing of said delivered pulses is in accordance with the values of the VA interval and the AV interval, whereby each train comprises the delivery of a pacing pulse to the atrium at the expiration of each of N VA delay intervals and a pacing pulse to the ventricle at the expiration of each of N AV delay intervals, and means for varying said AV delay interval from said programmed initial value at least once prior to completion of said series of M pulse trains.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of antitachycardia pacing in a dual chamber pacing device comprising the steps of:
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measuring cycle length of the tachycardia, determining a VA interval value less than or equal to the tachycardia cycle length, determining an initial value of the AV delay interval, delivering a pulse to the ventricle, delivering a pulse to the atrium at the expiration of said determined VA interval value, delivering a pulse to the ventricle at the expiration of said AV interval value, repeating pulse delivery to the atrium and the ventricle until the expiration of N VA intervals and N AV intervals thereby completing a first train of pulses, delivering a series of M trains of pulses similar to said first train of pulses, varying said AV delay interval value from the initial value at least once prior to the completion of said series of M trains of pulses. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. A dual chamber antitachycardia pacing device for the reversion of tachycardias comprising:
- means for detecting tachycardia, means for measuring cycle length of said tachycardia, pulse generating means responsive to said tachycardia detecting means for generating heart stimulating pulses for the atrium and for the ventricle, said pulse generating means including means for delivering a series of pacing pulse trains, means for sensing inherent QRS complexes during delivery of said trains of pacing pulses, means for determining an acceleration detection cycle length value less than said tachycardia cycle length, means for measuring cycle lengths of said sensed QRS complexes, and means for delivering at least one of cardioversion and defibrillation therapy when a number of said cycle lengths of said sensed QRS complexes are less than said acceleration detection cycle length.
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48. A method of antitachycardia pacing in a dual chamber pacing device comprising the steps of:
detecting a tachycardia, measuring cycle length of the tachycardia, delivering trains of antitachycardia pacing pulses to the atrium and to the ventricle, sensing inherent QRS complexes during the delivery of said trains of pacing pulses, determining an acceleration detection cycle length value less than said tachycardia cycle length, measuring cycle lengths of said sensed QRS complexes, and delivering at least one of cardioversion and defibrillation therapy when a number of said cycle lengths of said sensed QRS complexes are less than said acceleration detection cycle length.
Specification