A NEW TREATMENT OF THE PULMONARY DIFFUSING CAPACITY BY THE SINGLE BREATH METHOD
1971 年 21 巻 5 号 p. 507-516
詳細
1971 年 21 巻 5 号 p. 507-516
Two new treatments were attempted in the measurement of the pulmonary diffusing capacity in regard to the total lung capacity and the inspiration time. The alveolar gas volume was calculated by using the alveolar He concentration, which was measured originally in order to obtain the initial alveolar CO concentration. The inspiration time was corrected by use of a nomogram reported in a previous paper. As a result of measurements made in 18 normal subjects it was clarified that, when the alveolar gas volume was calculated through the above procedure, the effects of the error of He measurement on both the alveolar volume and the initial CO concentration counterbalanced each other and its effect on the DL was somewhat reduced. On the other hand, the correction of inspiration time resulted in a 2-8% increase in the calculated DL values.
