DocumentCode :
1254749
Title :
Partitioning of respiratory mechanical impedance by absolute and differential body plethysmography
Author :
Peslin, René ; Duvivier, Claude
Author_Institution :
Inst. Nat. de la Sante et de la Recherche Med., Univ. Henri Poincare, Vandoeuvre-les-Nancy, France
Volume :
46
Issue :
11
fYear :
1999
Firstpage :
1339
Lastpage :
1345
Abstract :
The authors have recently demonstrated the feasibility of partitioning total respiratory impedance (Z rs) into its airway (Z aw) and tissular (Z ti) components by measuring alveolar gas compression (V pt) plethysmographically during pressure oscillations at the airway opening (Peslin et al.). The aim of this study was to comparatively evaluate an alternative approach: the measurement of Z rs and of the transfer function (FTF) between airway flow and body surface flow obtained by absolute body plethysmography. The two approaches are theoretically equivalent, provided thermal and other artifacts are properly eliminated. Z rs and V pt (method 1) and Z rs and FTF (method 2) were measured in 11 healthy subjects from 4 to 29 Hz, using a pressure-type and a flow-type plethysmograph, respectively. Inspired gas was conditioned to body temperature and pressure, saturated with water vapor in both instances to minimize thermal factors. Z aw and Z ti spectra computed from both sets of data were quite similar in shape. Neither airway resistance nor tissue compliance differed significantly; tissue resistance, however, was about 14% lower with method 1, which may be due to imperfect gas conditioning. The reproducibility of the data was similar with the two approaches. It is concluded that absolute body plethysmography is as reliable as differential body plethysmography to partition Z rs.
Keywords :
flow measurement; fluid oscillations; medical signal processing; plethysmography; pneumodynamics; 4 to 29 Hz; absolute body plethysmography; airway flow; artifacts elimination; body surface flow; body temperature; differential body plethysmography; healthy subjects; imperfect gas conditioning; inspired gas; respiratory mechanical impedance partitioning; thermal factors minimization; tissue resistance; transfer function; water vapor; Fluid flow measurement; Immune system; Impedance measurement; Plethysmography; Pressure measurement; Reproducibility of results; Shape; Temperature; Thermal factors; Transfer functions; Adult; Electric Impedance; Female; Humans; Linear Models; Male; Middle Aged; Plethysmography, Whole Body; Random Allocation; Reference Values; Respiratory Mechanics;
fLanguage :
English
Journal_Title :
Biomedical Engineering, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9294
Type :
jour
DOI :
10.1109/10.797994
Filename :
797994
Link To Document :
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