[Lung hyperinflation and verification of its functional parameters].

A functional testing of lung hyperinflation parameters have been performed by two methods: body-plethysmography and helium single-breath method. The results obtained have been thereafter compared. In a group of 15 healthy patients no significant differences have been established except for the residual volume (RV). However, in a group of patients with C.O.P.D. significant differences among parameters have been established most of them for RV. The body-plethysmography method has no equal, however with the help of helium method it is also possible to measure out the closed noncommunicative airspaces in the lungs.