If respiratory acidosis persists after alveolar ventilation of a patient has been increased, which of the following could be the cause?
a. Chronic obstructive pulmonary disease
b. Pulmonary embolism
c. Pulmonary edema
d. Low PEEP levels
ANS: B
If pure respiratory acidosis persists even after alveolar ventilation has been increased, the patient may have a problem with increased dead space. One cause of increased dead space is a pulmo-nary embolism or low cardiac output, resulting in low pulmonary perfusion.
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