急速深呼吸曲線の分析
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概要
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The maximal breathing capacity (M. B. C.) is often measured to study the mechanism of the pulmonal ventilation, but this method presents a number of difficulties to carry out. So, recently, some attempts to measure the respiration force and its resistance quantitatively by analyzing the simple vital capacity registered on a rapid kimograph. For example, the measurement of the maximal midexpiratory flow (M. M. F.), the timed vital capacity test, the Tiffeneau test, etc. However, these tests treat only the analysis of the expiratory phase, neglecting that of the inspiratory one.To fill up the gap of these tests, the author studied the flow patterns of the maximum rapid and deep respiration from the basal level of the maximum expiration of 148 various subjects in sitting position using the Fukudas waterless respirometer at the fastest revolving speed (26.6mm/sec.) of the kimograph. A vertical line was drawn from the maximum point (A) of the inspiratory curve to the horizontal line of the recording paper of the kimograph, and the point B and C were chosen on the inspiratory and expiratory parts of the curve at the distance of 0.5 second (13.3mm on the graph) from the vertical line. At the triangle composed by three points A, B and C, the angle ∠BAC (α) was measured, and following results were obtained.1) The angle α was approximately under 60° for healthy subjects and over 90° for the cases of pulmanary emphysema or bronchiail asthma, also for the cases of so-called obstructive ventilatory impairement.2) For the cases of pleural adhesion or thoracoplasty, also for the cases of so-called restrictive ventilatory impairement, the angle was between 60° and 90°.3) By the fluctional anlysis of the flow patterns of the maximum rapid and deep breathing, the maximum flow rate (cc/0.188sec.) of the inspiration and expiration were studied. It was found that the mean value of the maximal expiratory velocity of pregnant women at 8th month was lower than that of the cases of pulmonary emphysema or bronchial asthma, but the inspiratory velocity curve was as similar as that of the normal subjects.4) Both the angle α and the maximal inspiratory and expiratory velocity were in significant correlation with M. M. F.
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