A patient is receiving mechanical ventilation in the pressure-regulated volume control (PRVC) mode and suddenly has an increase in airway resistance. How will this increase in airway resistance influence the delivered tidal volume?
A. The delivered tidal volume will remain relatively constant.
B. The increased airway resistance will cause the delivered tidal volume to decrease.
C. The increased airway resistance will result in an increased delivered tidal volume.
D. An unpredictable tidal volume will be delivered because of the increased airway resistance.
ANS: A
A. Correct response: Pressure-regulated volume control (PRVC) is a pressure-control mode with a volume target. It is also classified as a dual control mode. The therapist selects a tidal volume, and the ventilator delivers a test breath. During the test breath, the ventilator calculates the system compliance and airway resistance to determine the pressure needed to deliver the set tidal volume. The ventilator may adjust the pressure delivery every breath in increments of 1 to 3 cm H2O up to the maximum pressure that equals the upper pressure limit minus 5 cm H2O. Therefore the delivered tidal volume will remain relatively constant as either or both lung compliance and airway resistance change.
B. Incorrect response: See explanation A.
C. Incorrect response: See explanation A.
D. Incorrect response: See explanation A.?
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