Biomedical Engineering Reference
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2.5
× 10
4
Artery pressure,
no RH
Artery pressure,
low level of RH
Artery pressure,
high level of RH
Vein pressure,
no RH
Vein pressure,
low level of RH
Vein pressure,
high level of RH
2
1.5
1
0.5
0
0
100
200
300
400
500
600
Time (s)
FIgure 23.9
Different settings of pressure variation in larger arteries and veins. (From Shao HW et al.,
Computer Methods in Biomechanics and Biomedical Engineering
, 2012. With permission.)
0.8
0.75
0.7
0.65
No RH
Low level of RH
High level of RH
Measured result
0.6
0.55
0.5
0.45
0
100
200
300
Time (s)
400
500
600
FIgure 23.10
Variations of fingertip temperature for different levels of RH. (From Shao HW et al.,
Computer Methods in Biomechanics and Biomedical Engineering
, 2012. With permission.)
the predicted values for low-level RH were generally in agreement with the measured data. It is
notable that oscillations of the fingertip temperatures at the recovery stage were not revealed in
the simulation. Blood flow resulting from oscillations in the vasomotor smooth muscle tone may
cause the temperature fluctuations (Podtaev et al 2008). Since the smooth muscle in charge of
vasomotion exists in the arterioles and the density of microvessels was modeled as porosity in the
present model, it was reasonable and feasible to model periodic vasomotion as the periodic change
in porosity.
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