Parameter estimation of respiratory impedance measured by forced complex-wave oscillations.
Respiratory impedance data measured using the forced oscillation method were analyzed using an equivalent circuit model and the following conclusions were obtained: 1) Use of the complex wave oscillation method provided a measurement range of over 9 cmH2O/1/s with a resolution of 0.13 cmH2O/1/s. 2) The respiratory system was expressed as a two-compartment model. By expressing the circuit characteristics as phasor loci, a method was shown whereby individual impedance parameter values could be derived from the measured impedance phasor loci. 3) Under enflurane anesthesia, the model parameter values were derived as R1 = 1.2, R2 = 1.6 cmH2O/1/s, C1 = 0.02, C2 = 0.041/cmH2O and L = 0.065 cmH2O/1/s2.
Kinefuchi
Y
Y
Department of Anesthesiology, School of Medicine, Tokai University, Japan.
Suzuki
T
T
Takiguchi
M
M
Yamasaki
Y
Y
D000328:Adult; D000403:Airway Resistance; D000768:Anesthesia, General; D004594:Electrophysiology / Q000379:methods; D004737:Enflurane; D006801:Humans; D008433:Mathematics; D008954:Models, Biological; D009991:Oscillometry / Q000379:methods; D012119:Respiration
D004737:Enflurane