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Explorations into development of a neurally regulated cardiac pacemaker
Y Ikeda1, M Sugimachi, T Yamasaki
1Department of Cardiovascular Dynamics, National Cardiovascular Center Research Institute, Osaka, Japan.
The American Journal of Physiology
|December 11, 1995
Summary
Developing a neurally regulated artificial pacemaker is now possible. This new framework uses sympathetic nerve activity (SNA) to predict heart rate (HR), improving upon current artificial cardiac pacemakers.
Area of Science:
- Biomedical Engineering
- Neuroscience
- Cardiology
Background:
- Current artificial cardiac pacemakers lack sufficient rate-responsive function for physiological heart rate (HR) regulation.
- Sympathetic nerve activity (SNA) plays a crucial role in controlling heart rate.
Purpose of the Study:
- To propose a framework for developing an artificial pacemaker regulated by sympathetic nerve activity (SNA).
- To achieve truly physiological rate response in artificial pacemakers.
Main Methods:
- Quantified dynamic transduction characteristics from SNA to HR as a transfer function in anesthetized rabbits.
- Characterized the decoding rule as an impulse response (time-domain transfer characteristics).
- Approximated the transfer function using a first-order, low-pass filter with lag time.
Main Results:
- The transfer function was characterized by a corner frequency of 0.024 +/- 0.013 Hz and a lag time of 0.98 +/- 0.09 s.
- Predicted HR correlated well with measured HR (r = 0.80-0.98).
- The standard error of prediction relative to mean HR was low (1.2 +/- 0.7%), indicating high accuracy.
Conclusions:
- Direct decoding of SNA to predict instantaneous HR is feasible.
- This framework enables the development of a neurally regulated artificial pacemaker for improved patient management.