Which of the following situations is most likely to activate the occlusion alarm on the Newport Medical Instruments HT50 ventilator?
a. Increased airway resistance c. Water in the proxi-mal sensor line
b. Secretions in the patient circuit d. Patient biting the endotracheal tube
ANS: D
The occlusion alarm activates when the airway pressure remains +15 cm H2O above the positive end-expiratory pressure setting for 3 seconds after exhalation has begun or at the end of exhala-tion, whichever comes first. This could occur when a patient bites the endotracheal tube because biting the tube can keep the pressure elevated for long periods.
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