Which of the following NIV settings produces the greatest tidal volume, with all other variables being equal (i.e., airway resistance and lung compliance)?
a. IPAP = 20 cm H2O; EPAP = 8 cm H2O
b. IPAP = 15 cm H2O; EPAP = 5 cm H2O
c. IPAP = 12 cm H2O; EPAP = 6 cm H2O
d. IPAP = 18 cm H2O; EPAP = 4 cm H2O
ANS: D
If everything is equal, the largest tidal volume will be produced with the greatest pressure sup-port DIF.
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