The respiratory therapist has determined that a 4.0-mm internal diameter standard endotracheal tube is necessary for the patient. What is the equivalent hi-lo jet tube to be used with a Bunnell Life Pulse High-Frequency Jet Ventilator?
a. 3.0-mm internal diameter hi-lo jet tube
b. 3.5-mm internal diameter hi-lo jet tube
c. 4.0-mm internal diameter hi-lo jet tube
d. 4.5-mm internal diameter hi-lo jet tube
ANS: B
The external diameter of a hi-lo jet tube is approximately equal to the external diameter of a standard endotracheal tube that is a half-size larger. Therefore, hi-lo tube size = standard endo-tracheal tube size – 0.5 mm; 4.0 mm is standard endotracheal tube size, so 4.0 mm – 0.5 = 3.5-mm hi-lo tube size.
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