Which of the following changes can be expected when weaning a patient through a T tube trial?
1) Increase in respiratory rate of 10/min
2) Increase in heart rate of 15 to 20/min
3) 5 to 10 mm Hg rise in the arterial PCO₂
4) Doubling of the minute ventilation

Question

Quizplus · Accepted Answer

During a T tube trial, the patient's spontaneous breathing efforts are evaluated in preparation for weaning off mechanical ventilation. The increase in respiratory rate (option 1) and heart rate (option 2) are common changes due to the increased work of breathing. A slight increase in arterial PCO2 (option 3) may occur as the patient adjusts to the new respiratory effort. However, a doubling of the minute ventilation (option 4) is not expected and may indicate failure of the T tube trial. Therefore, options 1, 2, and 3 are expected changes during a T tube trial, while option 4 is not. The correct answer is B.

Which of the Following Changes Can Be Expected When Weaning