During high-frequency ventilation, as the diameter of the ETT increases, what happens to the delivered tidal volume under the same pressure settings?

Question

Quizplus · Accepted Answer

As ETT dimensions and compliance decrease, so does tidal volume output from the HFV tested. This occurs in the presence of stable ventilator settings. Therefore any clinical change causing a decrease in ETT diameter, such as reintubation with a different-sized ETT or partial ETT obstruction with tracheal secretions, alters the delivered tidal volume in a direct proportion. Furthermore, improvements in lung compliance (e.g., volume recruitment) and decrements in lung compliance (e.g., patent ductus arteriosus or alveolar derecruitment) have a direct effect on tidal volume.

During High-Frequency Ventilation, as the Diameter of the ETT Increases