High-frequency ventilation : oscillatory dynamics

Objectives: To determine the influence of the dynamic properties of the oscillator on the oscillatory volume delivered through the endotracheal tube to the lung or lung surrogate (delivered volume) under conditions of high-frequency ventilation. In particular, the relation between the tidal volume of the pump (oscillator) and the delivered volume was analyzed. Paco 2 was measured further as a function of the delivered volume in a number of experiments performed with healthy dogs. Design: Laboratory study. Setting: Engineering and animal laboratory. Subjects: Lung surrogates and healthy dogs. Interventions: An experimental oscillatory system was connected to various lung surrogates