Which of the following factors influence the delivered tidal volume during jet ventilation? I. mean airway pressure II. injector diameter III. endotracheal tube size IV. drive pressure
A. I, IV only
B. II, III only
C. I, II, III only
D. I, III, IV only
ANS: D
A. Incorrect response: See explanation D.
B. Incorrect response: See explanation D.
C. Incorrect response: See explanation D.
D. Correct response: With HFJV, the therapist has control over the respiratory rate, inspiratory time, jet "drive pressure," and expiratory pressure. Ultimately, however, the delivered jet Vt depends on a number of factors, including (1) the drive pressure, (2) injector diameter, (3) inspiratory time, (4) ETT size, (5) presence of an entrainment gas, and (6) the development of auto-PEEP.
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