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New assessment of small and large airway responsiveness to inhalation aerosol

Research Project

Project/Area Number 60870031
Research Category

Grant-in-Aid for Developmental Scientific Research

Allocation TypeSingle-year Grants
Research Field Respiratory organ internal medicine
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

TAKISHIMA Tamotsu  Tohoku University School of Medicine, 医学部, 教授 (20004765)

Co-Investigator(Kenkyū-buntansha) HIDA Wataru  Tohoku University School of Medicine, 医学部附属病院, 助手 (10142944)
SHIMIZU Yoshio  Tohoku University School of Medicine, 医学部附属病院, 助手 (90005421)
INOUE Hiroshi  Tohoku University School of Medicine, 医学部附属病院, 助手 (40133962)
Project Period (FY) 1985 – 1986
Project Status Completed (Fiscal Year 1986)
Budget Amount *help
¥8,000,000 (Direct Cost: ¥8,000,000)
Fiscal Year 1986: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1985: ¥7,000,000 (Direct Cost: ¥7,000,000)
Keywordsbronchial responsiveness / Fourier analysis / pulmonary resistance / 動肺コンプライアンス周波数依存性 / レーザー光散乱光 / 肺抵抗-ダイナミックコンプライアンス連続測定 / レーザ散乱法 / 薬物反応曲線 / 中枢気道 / 末梢気道
Research Abstract

To examine the role of small and large airway responsiveness to inhalation aerosols, we developed a new system which continuously measures both pulmonary resistance (R1) and frequency dependence of dynamic compliance (Cdyn.f.), calculated by Fourier-series analysis of flow and transpulmonary pressure in a single-cycle of breathing. R1 was obtained from fundamental harmonics. Cdyn.f was calculated from the linear regression line obtained from the fundamental to the third hermonics, and Cdyn at 0.5 Hz ( <C_(0.5)> ) and Cdyn at 0 Hz ( <C_0> ) were obtained. In house dust allergen inhalation, we observed that in some asthmatic patients the decrease in <C_0> and <C_(0.5)> preced the increase in R1 or <C_0> and <C_(0.5)> decreased progressively even if R1 did not change significantly. In some asthmatic subjects, after <beta_2> stimulant aerosol inhalation <C_0> and <C_(0.5)> continued to increase even after R1 decreased to minimum value. These results mean that small airway response to house dust aerosol may be earlier than the large airway response, and that <beta_2> stimulant aerosol may first dilate the large airway and then continue to dilate the small airways. Furthermore, we studied measurement of the amount of aerosol deposition in the airways using a laser scattering method. However, we could not yet establish the continuous measurement of the amount of aerosol deposition in the airways during two years. Further studies are needed.

Report

(2 results)
  • 1986 Final Research Report Summary
  • 1985 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] H.Sasaki;W.Hida;O.Taguchi;H.Nogami;Y.Okazaki;Y.Shimizu;H.Inoue;T.Takishima: Respiration. 50. 262-265 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] H. Sasaki, W. Hida, O. Taguchi, H. Nogami, Y. Okazaki, Y. Shimizu, H. Inoue, and T. Takishima: "Direct-Writing Recorder of the Frequency Dependence of Dynamic Compliance Analyzed from One Cycle of Breathing and Pulmonary Resistance: Effect of Fenoterol on Asthmatic Subjects." Respiration. 50. 262-265 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] American Review of Respiratory Disease. 131-4. (1985)

    • Related Report
      1985 Annual Research Report
  • [Publications] Annals of Allergy. 55-2. (1985)

    • Related Report
      1985 Annual Research Report
  • [Publications] 日本胸部疾患学会雑誌. 23-特別号. (1985)

    • Related Report
      1985 Annual Research Report
  • [Publications] 第24回日本ME学会大会論文集. 23-特別号. (1985)

    • Related Report
      1985 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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