A patient is receiving PC-CMV with a target tidal volume of at 750 ml. The average peak inspiratory pressure is 30 cm H2O, and the compliance factor for the breathing circuit is 3 ml/cm H2O. Calculate the volume compressed in the ventilator tubing
A. 250 ml
B. 90 ml
C. 25 ml
D. 10 ml
?ANS: B?A. Incorrect response: See the calculation associated with choice B.
B. Correct response: The compressible volume is defined as the volume that remains in the patient's breathing circuit at the end of inspiration. This compressed volume can be calculated as follows:
compressed volume = peak inspiratory pressure × tubing compliance factor
Vcompressed = PIP × Ctubing
Vcompressed = 30 cm H2O × 3 ml/cm H2O
Vcompressed = 90 ml
C. Incorrect response: See explanation associated with choice B.
D. Incorrect response: See explanation associated with choice B
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