High positive airway pressure can be maintained with which of the following airways?
a. Guedel airway c. Nasopharyngeal airway
b. Laryngeal mask airway d. Endotracheal tube airway
ANS: D
Endotracheal tubes allow ventilation with high levels of positive pressure; provide direct access to the lower airway for secretion removal and drug delivery; prevent aspiration of foreign materi-al into the lung; and permit bronchoscopic examination of the peripheral airways. None of the other airways mentioned are able to maintain ventilation with high pressures without leaking or allowing gastric distention.
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