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Respiratory tissue properties derived from flow transfer function in healthy humans

W Tomalak1, R Peslin, C Duvivier

  • 1Unité 14 de Physiopathologie Respiratoire, Institut National de la Santé et de la Recherche Médicale, Université H. Poincaré Nancy I, Vandoeuvre-les-Nancy, France.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|April 1, 1997
PubMed
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Forced oscillation measurements reveal that lung tissue resistance decreases with increasing frequency, while elastance shows complex volume-dependent patterns, suggesting mechanical inhomogeneity and potential respiratory muscle influence.

Area of Science:

  • Respiratory Physiology
  • Pulmonary Mechanics

Background:

  • The forced oscillation technique (FOT) is used to assess respiratory system impedance.
  • Understanding lung and chest wall tissue impedance (Zti) is crucial for diagnosing respiratory conditions.

Purpose of the Study:

  • To investigate the relationship between airway flow and chest flow using the flow transfer function (FTF).
  • To analyze lung and chest wall tissue impedance (Zti) in terms of tissue resistance (Rti) and effective elastance (Eti,eff) during breathing.

Main Methods:

  • Measured FTF at various oscillation frequencies (10-40 Hz) in healthy subjects using a flow-type body plethysmograph.
  • Analyzed data for Rti and Eti,eff, correcting for upper airway shunting and using plethysmographically derived thoracic gas volume.

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Main Results:

  • Tissue resistance (Rti) generally decreased with increasing oscillation frequency.
  • Effective elastance (Eti,eff) displayed a curvilinear relationship with frequency squared and a U-shaped pattern with respect to thoracic gas volume, exceeding static pressure-volume curve predictions.
  • Rti showed weak, variable volume dependence, while Eti,eff exhibited significant volume dependence, potentially influenced by respiratory muscle activity.

Conclusions:

  • FTF measurement is a valuable tool for studying Rti and Eti,eff.
  • Rti and Eti,eff likely have distinct physiological determinants, with Eti,eff showing notable volume and potential muscle activity influences.