Autoprotection features of the lung tissue during artificial ventilation

A method is described for understanding the autoprotection features of the lung tissue. It is based on the Hildebrandt model and is dealt with in the frequency domain. A simulation study has been performed using data from the literature. The amplitude spectra of alveolar flow and pressure have been analyzed under the conditions of pressure and volume control. The influencing parameters were: lung tissue and airways at different operating points, and respirator settings. The results of simulation show unambiguously that the collapse of the lung and the damage of tissues during the first moment of pressure control will be avoided by the biomechanical properties of the lung tissue