[Oscillation method in the diagnosis of respiratory function in adults--classification and possibilities for optimization. 1. Basic problems and introduction to the method].

There is pointed to the necessity, to clear up pathophysiologically a limitation of the maximum available respiratory volume or flow. The required investigations of breathing mechanics for registering the impedance under quiet breathing and measuring the residual volume are possible with the oscillation method at the base. There are listed the insecurities of the taken parameter with a short description of the basic theory of the oscillation method (fixed frequency technique).