For the purpose of clarifying the relationship between pulmonary ventilation, perfusion and their washout in various pulmonary diseases, pulmonary scintigraphy using
133Xe gas and
133Xe solution was performed in thirty two patients including eighteen patients with lung cancer.
Two washout indicies, early and late phase, were obtained by using a technique of digital computer simulation.
Following, results were obtained.
1) There was good correlation between early washout indices of the total lung and F.E.V.1.0% in slightly to moderately impaired lung especially after infusion. Late washout indices of the total lung was well correlated with % V.C. as well.
2) In lung cancer, there were highly significant correlation between relative inhalation counts and relative perfusion counts in impaired region. The perfusion was more severely impaired than the inhalation.
3) In impaired region, early washout rate of the infused was slower than that of the inhaled. There was good correlation between late washout rate after infusion and that after inhalation.
4) No correlation existed between the distribution and the washout rate both in inhalation study and perfusion study.
5) Relative inhalation and perfusion counts per washout indices were useful in distinguishing impaired region from normal region.
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