Can we optimize electrode placement for impedance pneumography?
In this paper, we discuss issues involved in defining an optimum placement of four electrodes for impedance pneumography. We observed a general trend where the change in impedance (delta Z) decreased while the sensitivity (delta Z/Z) increased with distance between the drive and receive electrode pairs. However, the theoretical study indicated that delta Z/Z should decrease with distance. The scatter of points in the plots indicated that sensitivity was influenced by factors other than distance. The correlation coefficient between the theoretical and measured delta Z/Z was low, but significant. This suggested that the best electrode configuration can be derived from the theoretical data. High delta Z/Z was obtained when the drive and receive electrode pairs were placed close to the lungs and in different horizontal planes.
Khambete
N
N
Department of Medical Physics, University of Sheffield Royal Hallamshire Hospital, United Kingdom.
Metherall
P
P
Brown
B
B
Smallwood
R
R
Hose
R
R
D000328:Adult; D017097:Electric Impedance; D004566:Electrodes; D006801:Humans; D008168:Lung / Q000033:anatomy & histology*; D008875:Middle Aged; D008954:Models, Biological; D010992:Plethysmography, Impedance / Q000379:methods*; D012119:Respiration; D013909:Thorax