Which of the following considerations should the therapist be mindful of when choosing to ventilate a patient with pressure support ventilation?
A. Adding mechanical dead space will decrease the patient's VT.
B. The respiratory rate will likely remain constant.
C. While asleep, the patient may experience apnea.
D. The patient's respiratory muscle load may decrease the patient's PaCO2.
?ANS: C
A. Incorrect response: See explanation C.
B. Incorrect response: See explanation C.
C. Correct response: When patients are asleep or under sedation, chemical feedback is the most important factor in determining a patient's breathing pattern. Under this condition, a drop in PaCO2 by only a few mm Hg induces apnea. Assisted ventilation with high VT with assist-control ventilation or PSV results in hypocapnia and increases the likelihood of apneas and periodic breathing.
D. Incorrect response: See explanation C.
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