Energy converter for implantable cardioverter
System for prevention of paroxysmal supraventricular tachycardia
Automatic implantable defibrillator and pacer
Physiologically responsive pacemaker and method of adjusting the pacing interval thereof
Pacemaker having PVC response and PMT terminating features
Microprocessor controlled rate-responsive pacemaker having automatic rate response threshold adjustment
Atrial rate based programmable pacemaker with automatic mode switching means
Adaptable, digital computer controlled cardiac pacemaker
Arrhythmia prediction and prevention for implanted devices
Pacing system for termination of cardiac arrhythmias utilizing scanning techniques
ApplicationNo. 788152 filed on 01/24/1997
US Classes:607/14Treating or preventing abnormally high heart rate
ExaminersPrimary: Kamm, William E.
International ClassA61N 001/362
AbstractPreemptive 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.