Implantable stimulation device having means for operating in a preemptive pacing mode to prevent tachyarrhythmias and method thereof
First Claim
1. A method of operating an implantable medical device in one of a main operating mode or a preemptive tachyarrhythmia preventive pacing operating mode, the implantable medical device including pulse generating means for generating pacing pulses and directing such pulses to cardiac tissue of a patient, the pulse generating means being controlled by a processor, the processor being coupled to a memory wherein an operating program for controlling the operating modes may be stored, the method comprising the steps of:
- (a) sensing at least one parameter associated with the physiology of the patient'"'"'s heart for an indication that a tachyarrhythmia may soon occur;
(b) determining when the at least one parameter exceeds a prescribed threshold, thereby indicating that a tachyarrhythmia may soon occur;
(c) automatically operating the implantable medical device in accordance with the main operating mode whenever the at least one parameter suggests that a tachyarrhythmia may not soon occur, wherein the main operating program is aimed at controlling the implantable medical device so that it performs its intended function; and
(d) automatically operating the implantable medical device in accordance with the preemptive tachyarrhythmia preventive pacing operating mode whenever the at least one parameter exceeds the prescribed threshold thereby indicating that a tachyarrhythmia may soon occur, wherein the preemptive tachyarrhythmia preventive pacing operating mode is aimed at preventing a tachyarrhythmia from occurring.
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Accused Products
Abstract
Preemptive tachyarrhythmia pacing is provided in an implantable cardiac-stimulation device, such as an implantable pacemaker or defibrillator, by modifying the operation of the implantable device in a way that minimizes the likelihood of occurrence of a tachyarrhythmia. The behavior modification is achieved through the use of an appropriate preemptive tachyarrhythmia pacing control routine stored within the memory of the device. Depending upon the needs of the patient, preemptive tachyarrhythmia pacing is invoked continuously or on demand. If invoked on demand, Preemptive tachyarrhythmia pacing is triggered only upon the sensing of one or more conditions suggest that the onset of a tachyarrhythmia is imminent. When thus invoked, preemptive tachyarrhythmia pacing remains invoked only for as long as the onset-of-a-tachyarrhythmia-is-imminent conditions persist. Various preemptive tachyarrhythmia pacing control routines are contemplated, including those based on overdrive pacing, pacing with randomicity, and mode switching. Overdrive pacing, when used, is based on an automatically-determined diurnal rate, an automatic stepped increase over the average atrial rate, or a rate set by a cycle-to-cycle negative hysteresis. Conditions which suggest the imminency of the onset of a tachyarrhythmia include, but are not limited to, a sudden change in the patient'"'"'s cardiac cycle from a previously-determined normal cardiac cycle.
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Citations
62 Claims
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1. A method of operating an implantable medical device in one of a main operating mode or a preemptive tachyarrhythmia preventive pacing operating mode, the implantable medical device including pulse generating means for generating pacing pulses and directing such pulses to cardiac tissue of a patient, the pulse generating means being controlled by a processor, the processor being coupled to a memory wherein an operating program for controlling the operating modes may be stored, the method comprising the steps of:
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(a) sensing at least one parameter associated with the physiology of the patient'"'"'s heart for an indication that a tachyarrhythmia may soon occur; (b) determining when the at least one parameter exceeds a prescribed threshold, thereby indicating that a tachyarrhythmia may soon occur; (c) automatically operating the implantable medical device in accordance with the main operating mode whenever the at least one parameter suggests that a tachyarrhythmia may not soon occur, wherein the main operating program is aimed at controlling the implantable medical device so that it performs its intended function; and (d) automatically operating the implantable medical device in accordance with the preemptive tachyarrhythmia preventive pacing operating mode whenever the at least one parameter exceeds the prescribed threshold thereby indicating that a tachyarrhythmia may soon occur, wherein the preemptive tachyarrhythmia preventive pacing operating mode is aimed at preventing a tachyarrhythmia from occurring. - 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, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A method of operating an implantable tissue-stimulating medical device in a preemptive tachyarrhythmia pacing mode for the purpose of preventing the occurrence of a tachyarrhythmia, said method comprising:
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sensing a value of at least one physiological condition capable of predicting the occurrence of a tachyarrhythmia; detecting when the value of the at least one physiological condition provides an indication that a pre-tachycardia condition exists; and when such pre-tachyarrhythmia condition is detected, modifying the behavior of the implantable tissue-stimulating medical device so as to minimize the likelihood of occurrence of a tachyarrhythmia. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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49. A method of operating an implantable tissue-stimulating device, the device having generating means for generating electrical stimulating pulses of specified energies and applying the pulses to body tissue at specified times, and means for sensing natural muscle contractions of the body tissue, the method comprising:
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predicting when a tachyarrhythmia may occur;
operating in a preemptive tachyarrhythmia pacing mode whenever a tachyarrhythmia is predicted to occur, the preemptive tachyarrhythmia pacing mode triggering the generation of electrical stimulating pulses to the tissue at controlled times and energy levels designed to minimize the occurrence of a tachyarrhythmia in the tissue being stimulated; andoperating the tissue-stimulating device in a non-preemptive tachyarrhythmia pacing mode whenever a tachyarrhythmia is not predicted to occur. - View Dependent Claims (50)
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51. An implantable cardiac tissue-stimulating device comprising:
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pulse generating means for generating electrical stimulating pulses of specified energies; lead/electrode means for delivering the stimulating pulses to cardiac tissue; sensing means for sensing natural muscle contractions of the cardiac tissue; means for determining when a pre-tachycardia condition exists; and processing/control means for operating in a preemptive tachyarrhythmia pacing mode when the pre-tachyarrhythmia condition exists and in a non-preemptive mode when the pre-tachyarrhythmia does not exist, the preemptive tachyarrhythmia pacing mode comprising means for triggering the pulse generating means of the tissue-stimulating device to apply electrical stimulating pulses to the cardiac tissue at controlled times and energy levels designed to minimize the occurrence of a tachyarrhythmia in the tissue being stimulated. - View Dependent Claims (52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62)
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Specification