[Resistometry-improvement of the hydrodynamic function test of sinus frontalis duct system (author's transl)]

The biophysical and technical base as well as clinical applications of a new functional diagnostic system of sinus frontalis disorders are described. The system consists of a ventilation test and the so called "resistometry". The principle of the resistometry is the generation of a fluid flow in the frontal sinus duct system by a pressure regulated injector, the measurement and registration of flow and pressure and the calculation of the hydrodynamic resistance of the duct system. The resistance is determined in "Resistance Units" (RU). The possibilities of the proposed diagnostic system in differential diagnosis are shown in 156 cases. Apart from the quantitative assessment of the classical inflammations of the frontal sinus the functional diseases of the duct system may be discriminated with certainity.