Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1994-11-15
1995-11-14
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
607 9, A61N 1368
Patent
active
054662451
ABSTRACT:
A DDD-type cardiac pacemaker having a microprocessor-based controller is programmed to automatically determine and utilize and optimize A-V delay for the patient in whom the device is implanted. The microprocessor-based controller periodically changes the A-V delay and then computes heart rate variability over an insuing predetermined period. The particular A-V delay value associated with the minimum heart rate variability index is determined to be the optimum. Heart rate variability may be determined by performing a power spectrum analysis on cyclic variations in R-R intervals, preferably using a FFT signal processing chip, or by a time domain analysis based upon the standard deviation of R-R intervals during a prescribed period of time and a calculated value of respiratory sinus arrhythmia. The apparatus is also operative to optimize the A-V delay interval following a change in the pacing mode of the DDD-type pacemaker.
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Heemels Jan P.
Spinelli Julio C.
Cardiac Pacemakers Inc.
Kamm William E.
Schaetzle Kennedy J.
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