Parameter estimation of transpulmonary mechanics by a nonlinear inertive method

Z. Hantos, B. Daroczy, J. Klebniczki, K. Dombos, S. Nagy

Research output: Article

9 Citations (Scopus)

Abstract

Transpulmonary mechanics of anesthetized intubated dogs were studied during control breathing and hemorrhage-induced hyperventilation by least-mean-squares parameter estimation using several model versions. The classical elastance-resistance model was modified to include nonlinear elastic and viscous pressure terms with and without a linear inertive pressure component. Inclusion of nonlinear terms decreased the root-mean-square error of fitting (q) of the classical model on the average to 67% in the control period and to 58% during hyperventilation. An additional decrease due to inertance was 4% (control) and 22% (hyperventilation) and was associated with acceptable estimates of inertance [0.056 ± 0.02 (SD) and 0.063 ± 0.008 cmH2O.l-1.s, respectively]. When inertance alone was added to the classical model, negligible improvement in q and unrealistic values of inertance were obtained. Conventional measures (Edyn and midvolume resistance) were close to the corresponding least-mean-squares estimates (E and R) of all model versions, except that in hyperventilation neglecting the inertance caused Edyn to markedly overestimate E of the nonlinear inertive model.

Original languageEnglish
Pages (from-to)955-963
Number of pages9
JournalJournal of Applied Physiology Respiratory Environmental and Exercise Physiology
Volume52
Issue number4
Publication statusPublished - okt. 25 1982

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ASJC Scopus subject areas

  • Physiology
  • Endocrinology

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