Which of the following oxygenation measures support a patient's readiness to wean? 1. PaO2/PAO2 (a/A) = 0.45 2. PaO2/FiO2 (P/F) = 110 3. PAO2 PaO2 = 240 mm Hg 4. Physiologic shunt (Qs/Qt) = 12
a. 1 and 3 only
b. 1, 2, and 3 only
c. 2 and 4 only
d. 1, 3, and 4 only
Q. 2 Which of the following factors can reduce a patient's ventilatory drive? 1. Respiratory alkalosis 2. Metabolic acidosis 3. Depressant drugs 4. Decreased metabolism
a. 1 and 3 only
b. 1, 2, and 3 only
c. 2 and 4 only
d. 1, 3, and 4 only
Q. 3 Ventilatory capacity is determined by which of the following? 1. Central nervous system (CNS) drive 2. Trigger level 3. Muscle strength 4. Muscle endurance
a. 1 and 3 only
b. 1, 2, and 3 only
c. 2 and 4 only
d. 1, 3, and 4 only
Q. 4 When is ventilator dependence likely to occur? 1. When ventilatory capacity exceeds demand 2. When arterial hypoxemia is present 3. When the patient is malnourished 4. When the cardiovascular system is unstable
a. 2 and 4 only
b. 1, 2, and 3 only
c. 3 and 4 only
d. 2, 3, and 4 only
Q. 5 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
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