Abstract
Endotracheal tube (ETT) resistance measured in isolation may differ from the effective ETT resistance in vivo. Much of this difference results from the dissipation of kinetic energy near regions of abrupt cross-sectional area change at the end of the ETT. Measurements made on an artificial ETT-tracheal model illustrate that effective ETT resistance is variable and dependent on the size of the artificial trachea. These experimental results are consistent with aerodynamic theory and suggest that one cannot assume that ETT resistance measured in isolation will be the same as the effective ETT resistance in vivo.
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