[Oscillation method in the diagnosis of respiratory function in adults--classification and possibilities for optimization. 2. Oscillatory resistance (ROS)].

The oscillatory resistance (Ros) can be measured routinely by simple set frequency technique under physiological conditions relatively independent of age and cooperation of the examinee. It is as a complex number of the breathing mechanics only relatively comparable with the body plethysmographic resistance. Taking into consideration the dependence on actual lung volume and seriousness of obstruction one can give statements adequately reliable for practice with the help of ROS within a limit from 1 to 10 hPa/l/s. By varying of measuring frequency and reference resistor the estimation of low and middle endobronchial obstructions can be optimized (also without additional measuring of the phase-angle).