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Summary form given in English only: Total respiratory impedance, from 1 to 20 Hz, has been obtained by a modification of the forced oscillation method, in which a complex wave pressure imposed on the respiratory system and the flow induced were processed by Fourier spectral analysis. Parameters of a 2-compartment model were estimated on the complex plane by a phasor method in which all elements were represented as phasores and its frequency characteristics were displayed as phasor loci. It appeared from this study that: (1) The resistance and inertance of an endotracheal tube were 2.2 cm H2O/l/sec.2, 0.07 cm H2O/lsec. respectively. (2) After correcting for the effect of the tube, large airway resistance and inertance, small airway compliance, parenchymal resistance and intertance during enflurane anesthesia were found to be as follows 1.2 cm H2O/l/sec.2, 0.07 cm H2O/l/sec., 0.02 l/cm H2O, 1.6 cm H2O/l/sec., 0.04 l/cmH2O respectively. Estimates obtained with added external resistance was consistent with predicted effects.