How much patient effort is needed to trigger a ventilator breath when there is 8 cm H2O of un-intended positive end-expiratory pressure (auto-PEEP) and a pressure trigger setting of 2 cm H2O?
a. 2 cm H2O
b. 6 cm H2O
c. 8 cm H2O
d. 10 cm H2O
ANS: D
The effort required to trigger a breath equals the sum of the auto-PEEP and the pressure trigger setting.
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