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  • 1 Institute of Surgical Research University of Szeged, Szeged, Hungary
  • | 2 Institute of Surgical Research University of Szeged, Szeged, Hungary
  • | 3 Department of Medical Informatics and Engineering University of Szeged, Szeged, Hungary
  • | 4 Institute of Surgical Research University of Szeged, Szeged, Hungary
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Because of similar pathophysiologic changes, oleic acid (OA)-induced pulmonary edema has been well established as an experimental model of certain types of ARDS. Data in the literature indicate changes mostly in global pulmonary mechanical parameters (lung resistance and compliance) during permeability-type edema. Therefore, we designed this study (1) to separate the OA-induced mechanical responses into airway and parenchymal components, and (2) to examine the relationship between the mechanical parameters and the degree of edema. Anaesthetized, paralyzed, mechanically ventilated rats were given iv. OA in doses of 0 (C n=9), 0.05 (OA0.05 n=8), 0.1 (OA0.1 n=10) and 0.3 (OA0.3 n=5) ml/kg. Respiratory system impedance was measured with a wave-tube low-frequency forced oscillation technique, and a model fitting was used to estimate airway (Raw) and lung tissue parameters (G, parenchymal damping; H, elastance). Pulmonary edema was quantified by gravimetric analysis (WW/DW, wet-to-dry weight ratio). In the OAL0.05 group, transient, but significant increase in Raw, only slight increase in H, and no response in G was observed. Different responses were obtained in OA0.1: significant Raw, G, and H values in survivors; rapid and significantly higher responses in all three parameters in non-survivors. Extremely large parameter values were measured in OA0.3. We found that OA caused dose-related increases in WW, DW and WW/DW. Highly significant correlations were found between the degree of edema and G or H, but not Raw. This study demonstrates that low dose of OA had only transient lung mechanical effects; however, it resulted in mild edema. The higher dose elicited significant airway and tissue changes (smaller responses in survivors than in non-survivors), and severe edema. The strong correlation between lung tissue parameters and the degree of edema suggests that the OA-induced acute lung injury is manifested primarily in the alterations in parenchymal mechanics.

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Senior editors

Editor(s)-in-Chief: Rosivall, László

Honorary Editor(s)-in-Chief): Monos, Emil

Managing Editor(s): Bartha, Jenő; Berhidi, Anna

Co-editor(s): Koller, Ákos; Lénárd, László; Szénási, Gábor

Assistant Editor(s): G. Dörnyei (Budapest), Zs. Miklós (Budapest), Gy. Nádasy (Budapest)

Hungarian Editorial Board

      Benedek, György (Szeged)
      Benyó, Zoltán (Budapest)
      Boros, Mihály (Szeged)
      Chernoch, László (Debrecen)
      Détári, László (Budapest)
      Hamar, János (Budapest)
      Hantos, Zoltán (Szeged)
      Hunyady, László (Budapest)
      Imre, Sándor (Debrecen)
      Jancsó, Gábor (Szeged)
      Karádi, Zoltán (Pécs)
      Kovács, László (Debrecen)
      Palkovits, Miklós (Budapest)
      Papp, Gyula (Szeged)
      Pavlik, Gábor (Budapest)
      Spät, András (Budapest)
      Szabó, Gyula (Szeged)
      Szelényi, Zoltán (Pécs)
      Szolcsányi, János (Pécs)
      Szollár, Lajos (Budapest)
      Szücs, Géza (Debrecen)
      Telegdy, Gyula (Szeged)
      Toldi, József (Szeged)
      Tósaki, Árpád (Debrecen)

International Editorial Board

      R. Bauer (Jena)
      W. Benjelloun (Rabat)
      A. W. Cowley Jr. (Milwaukee)
      D. Djuric (Belgrade)
      C. Fry (London)
      S. Greenwald (London)
      O. Hänninen (Kuopio)
      H. G. Hinghofer-Szalkay (Graz)
      Th. Kenner (Graz)
      Gy. Kunos (Richmond)
      M. Mahmoudian (Tehran)
      T. Mano (Seki, Gifu)
      G. Navar (New Orleans)
      H. Nishino (Nagoya)
      O. Petersen (Liverpool)
      U. Pohl (Münich)
      R. S. Reneman (Maastricht)
      A. Romanovsky (Phoenix)
      G. M. Rubanyi (Richmond)
      T. Sakata (Oita)
      A. Siddiqui (Karachi)
      Cs. Szabo (Beverly)
      E. Vicaut (Paris)
      N. Westerhof (Amsterdam)
      L. F. Zhang (Xi'an)

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Acta Physiologica Hungarica
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Phone/Fax: +36-1-2100-100
E-mail: aph@semmelweis-univ.hu

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Acta Physiologica Hungarica
Language English
Size  
Year of
Foundation
1950
Publication
Programme
changed title
Volumes
per Year
 
Issues
per Year
 
Founder Magyar Tudományos Akadémia
Founder's
Address
H-1051 Budapest, Hungary, Széchenyi István tér 9.
Publisher Akadémiai Kiadó
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0231-424X (Print)
ISSN 1588-2683 (Online)

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