Which of the following is the explanation for the increased ratio when excessive positive end ex-piratory pressure (PEEP) is used?
a. Diversion of blood from ventilated alveoli to hypoventilated alveoli
b. Diversion of blood from hypoventilated alveoli to ventilated alveoli
c. Shunt-like effect
d. Hyperexpansion
ANS: A
When excessive PEEP is used, blood flow is diverted from ventilated alveoli to hypoventilated alveoli; the result is an increased ratio.
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