Biomedical Engineering Reference
In-Depth Information
Fig. 4.52.
Upper part:
the changes with respect to time in the SSNA, skin blood
flow at the finger, digital arterial pressure of a subject when the subject was repea-
tedly exposed to unpleasant white noise.
Lower part:
the driving condition of the
artificial heart system and the arterial pressure of the mock circulatory system
also increased in response to this change in the number of SSNA pulses in
accordance with the algorithm for changes in the driving parameters.
In order to reproduce all the responses of the cardiac and circulatory
system in the living body in the mock circulatory system, it is necessary to
change not only the driving condition of the artificial heart system but also
the passage resistance of the mock circulatory system on-line in accordance
with the change in the actual total peripheral vascular resistance of the living
body. However, in this experiment, it was impossible to achieve this (the
resistance was maintained at a constant value), and we controlled the artificial
heart system so that the changes with respect to time in the blood pressure
