Overall, when mechanically ventilating a patient who has airflow obstruction, which of the following issues should the therapist bare in mind when managing this type patient compared with a person with normal lungs?
A. This patient may require less minute ventilation.
B. This patient may need to receive elevated peak inspiratory pressures.
C. The delivery of lower than usual inspiratory flows should be expected.
D. The acceptable oxygenation (Pao2) level of this type patient will lie in the range of 70 to 80 mm Hg.
ANS: A
A. Correct response: The therapist must realize that managing the mechanical ventilation of patients who have airflow obstruction, characterized by (1) air trapping and auto-PEEP, and (2) narrowed airways causing high resistance to airflow, may involve significant reduction of minute ventilation and resulting hypercapnia. This situation may be entirely normal for this type of patient who may be a CO2 retainer.
B. Incorrect response: See explanation A.
C. Incorrect response: See explanation A.
D. Incorrect response: See explanation A.?
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