The critical care nurse is assessing a patient to see if he fits the criteria for weaning off the mechanical ventilator. What must the tidal volume be to fall within the criteria for ventilator weaning?
A) 7 to 9 mL/kg
B) 8 to 10 mL/kg
C) 9 to 11 mL/kg
D) 10 to 12 mL/kg
Ans: A
Feedback: Assess patient for weaning criteria: vital capacity should be 10 to 15 mL/kg, maximum inspiratory pressure (MIP) should be at least –20 cm H2O, tidal volume should be 7 to 9 mL/kg, minute ventilation should be 6 L per minute, rapid/shallow breathing index should be below 100 breaths per minute per liter, and PaO2 should be greater than 60 mm Hg with FiO2 less than 40%.
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