Biomedical Engineering Reference
In-Depth Information
Fig. 7.24
Quality factors
QF
6(
left
) and power factors
PF
6(
right
) evaluated at 6 Hz in
1
: healthy;
2
: asthma; and
3
: asthma after bronchial challenge. See corresponding
p
-values discussed in text
Fig. 7.25
Real part of impedance
R
6 evaluated at 6 Hz (
left
) and tissue hysteresivity
η
r
(
right
)
in
1
: healthy;
2
: asthma; and
3
: asthma after bronchial challenge. See corresponding
p
-values
discussed in text
The real values of impedance
R
6(
p<
0
.
22) and the tissue hysteresivity
η
r
(
p<
0
.
29) were not significantly different between the groups. These findings are
in agreement with similar studies in asthma groups, using forced oscillation lung
function test [
19
]. The authors also report no statistical significant differences be-
tween the control and NE groups in mean reactance, mean resistance and resonant
frequency.
7.3.6 Healthy vs. Cystic Fibrosis in Children
The complex impedance values for the cystic fibrosis (CF) children obtained using
(
3.8
) are depicted in Fig.
7.26
and the equivalent Bode plots are given in Fig.
7.27
.
The healthy children are the same as in the previous section.
Table
7.14
presents the results obtained from the identification of model param-
eters. There were no significant variances between the groups for tissue damping
