A patient is receiving controlled, continuous mandatory ventilation, and suddenly experiences increased airway resistance. How will the patient's airway and alveolar pressures be affected by this condition?
A. Neither of these two pressures will be influenced.
B. These pressures will decrease in response to increased airway resistance.
C. These pressures will increase in the presence of elevated airway resistance.
D. Both pressures will fluctuate when this patient is confronted by increased airway resistance.
ANS: C
A. Incorrect response: See explanation C.
B. Incorrect response: See explanation C.
C. Correct response: Choosing flow or volume versus pressure-controlled ventilation for CMV depends largely on the therapist's clinical experience because the two approaches are more similar than they are different. Clinical data are lacking in terms of one form of ventilation over the other. During volume-controlled ventilation, airway and alveolar pressures are dependent variables, and increase or decrease depending on changes in the patient's lung mechanics or patient effort. Thus worsening of airway resistance can cause abrupt increases in airway pressure to preserve minute ventilation.
D. Incorrect response: See explanation C.?
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