What is the most important prerequisite for weaning a patient from ventilatory support?
a. Improvement in the original problem re-quiring mechanical ventilation
b. Assurance that the patient's ventilatory demand exceeds the patient's capacity
c. Objective evidence indicating good res-piratory muscle endurance
d. Ability to maintain adequate oxygenation with an FiO2 less than 0.4
ANS: A
The single most important criterion to consider when evaluating a patient for ventilator discon-tinuation or weaning is whether there has been significant alleviation or reversal of the disease state or condition that necessitated use of the ventilator in the first place.
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