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The pulmonary circulation time was assessed by measuring the parameter "TP", which had been developed and reported elsewhere,l) for detecting the disturbances of pulmonary blood flow in patients with respiratory diseases. The materials were thirteen normal subjects, seven cases of slight COPD (group I), nine cases of severe COPD (group II), and three cases of old tuberculosis with restrictive ventilatory impairement (group III). The mean Tp value were 1.78±0.48 in normal subjects, 1.55±O.39 inpmid:3833314 fatcat:qdw6rwobnngjjaplmanejs7vzq