Predictive Value of Tidal Volume and Peak Inspiratory Pressure in Normal Frequency Jet Ventilation
Description
Experimental design and experimental data
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Steps to reproduce
The jet needle was inserted into the oblique ventilation port of a rigid bronchoscope with an internal diameter of 13 mm. This bronchoscope was connected to a simulated lung model via a solenoid valve. During the inspiratory phase, activation of the differential pressure switch (DPS) energized the solenoid valve, facilitating lung expansion while concurrently measuring the airway pressure near the tracheal carina (referred to as Paw). During the expiratory phase, the exhaled airflow from the lung model was directed into a plastic bag housed within a specialized tank. After one minute of jet ventilation, pressure-air was introduced to compress the plastic bag, enabling a steady outflow of air, which was subsequently measured using a flow meter to assess minute ventilation (referred to as MV). Four independent variables were investigated: the type of jet needle, characterized by three different internal diameters (IDneedle); the simulated lung model, which represented two distinct types of dynamic lung compliance (Cdyn); driving pressure (DPpipeline), assessed at six levels; and frequency (Fjet), evaluated across nine settings. The dependent variables were the tidal volume (VT) and peak inspiratory pressure (PIP). Each unique combination of independent variables was measured in duplicate, and the resulting values of the dependent variables were averaged for further analysis. All data were collected using specialized software, and the original data were stored on a laptop . The Cdyn of the lung models was evaluated using the one-way valve of the Dräger anesthesia machine. Similarly, during the jet ventilation cycle, the airway pressure curves of the simulated lungs were measured using the pressure sensors of the anesthesia machine.