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With Reference to Significance of Our Alveolar Function Diagram Consisted with both a-ADCO2 (ordinate) and A-aDO2 (abscissa). Shingo Aoyama 1 , Tatsuo Satake 1 , Masaru Kataoka 1 , Yukio Iida 1 , Hideyuki Obayashi 1 , Junya Takahashi 1 , Akira Mizutani 1 , Toshio Imaizumi 1 1The 2nd Dept. of Internal Medicine, School of Medicine, Nagoya University. pp.735-745
Published Date 1965/9/15
DOI https://doi.org/10.11477/mf.1404201496
  • Abstract
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In many obstructive airway diseases, alveolar functions, especially a-ADco2, A-aDo2, shuntlike effects and VA/Q were studied. They were compared with other parameters of cardio-pulmonary functions. The "mean alveolar Po2" was calculated from the alveolar air equation using the end-tidal Pco2 determined by an infra-red CO2 analyser, in place of the Paco2were measured by a combianalyser simultane-ously.

1) a-ADco2 were 2.0±1.9, 12.3±6.7, 12.4±8.9 and 13.7±5.6 mmHg, in normal, bronchial asthma, chronic bronchitis and chronic pul-monary emphysema, respectively.

2) Since the a-ADco2 exists, the "mean alveolar PO2" thus obtained was found approx. 15mmHg higher than the PAo2 which was calculated using the Pacp2 in chronic obstructive air way diseases. Thus obtained A-aDo2 were 9.0±4.6, 40.5±15.8, 39.6±19.1 and 47.0±12.6 mmHg in normal, bronchial asthma, chronic bronchitis and chronic pulmonary emphysema, respec-tively.

3) The A-aDo2 had negative correlation with the Pao2(r=-0.765), while the a-ADco2 were roughly correlative with the Paco2 (r=0.643) at rest, or after administration of bronchodi-lator.

4) Neither the A-aDo2 nor the a-ADco2 corre-lated with the FEV1/VC at rest, or after administration of bronchodilator. In some cases, decreases in A-aDo2 and the a-ADco2 were found without any increase in the FEV1/VC.

5) The a-ADco2 were correlative with the alveolar dead space ventilation ratio 〔r= 0.927, VDalv・/VTalv・=3(a-ADco2)0.9〕 at rest, or after admi-nistration of bronchodilator.

6) The A-aDo2 and a-ADco2 tended to correlate with the total pulmonary resistance (r=0.522, r=0.660). Furthermore, VA/Q in slow space had rough negative correation with the total pulmonary resistance (r=-0.663).

7) In all cases, anatomical shunts were within 10%, but the shuntlike effects due to uneven-ness of VA/Q distribution were more than 10%. The later was exponential correlative with the A-aDo2(QS/QT=1.5e0.047(A-aDo2))at rest, or after administration of bronchodilator.

Authors make up the alveolar function dia-gram consisted with both a-ADco2 (ordinate) and A-aDo2 (abscissa). This diagram may give a clinical estimation of the severity in chronic obstructive air way diseases.


Copyright © 1965, Igaku-Shoin Ltd. All rights reserved.

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