DocumentCode :
1111402
Title :
Physical Science, Measurement and Instrumentation, Management and Education, IEE Proceedings A
Author :
Gergely, S. ; Walton, C. ; Economides, A.P.
Author_Institution :
Coventry Polytech., UK
Volume :
136
Issue :
4
fYear :
1989
fDate :
7/1/1989 12:00:00 AM
Firstpage :
202
Lastpage :
206
Abstract :
The development of intelligent and adaptive cardiac pacemakers is limited by the absence of a reliable measure of physiological state. Evidence exists to suggest that the required information may be obtained from the paced evoked cardiac potentials. The most convenient way to measure these potentials, in clinical practice, is to use the existing single unipolar electrode for both stimulation and measurement. Owing to the electrochemistry of the electrode tissue system, an afterpotential exists across the electrodes following the stimulus. This is approximately two orders of magnitude larger than the potential to be measured. The system developed by the authors cancels the afterpotential in a novel, quasi-closed-loop, adaptive manner. The designs of the system and the electronic circuitry are described. Several sets of equipment have been constructed and used by the authors, and others, for the reliable measurement of the paced evoked cardiac potential.<>
Keywords :
adaptive systems; biocontrol; bioelectric potentials; biomedical measurement; cardiology; closed loop systems; pacemakers; adaptive cardiac pacemakers; adaptive system; afterpotential; electrochemistry; electrode tissue system; intelligent pacemaker; measurement; quasi-closed-loop; stimulation; unipolar paced-evoked potentials;
fLanguage :
English
Journal_Title :
Physical Science, Measurement and Instrumentation, Management and Education, IEE Proceedings A
Publisher :
iet
ISSN :
0143-702X
Type :
jour
Filename :
29499
Link To Document :
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