A patient receiving long-term positive-pressure ventilation support exhibits a progressive weight gain and a reduction in the hematocrit. Which of the following is the most likely cause of this problem?
a. Pulmonary hemorrhage
b. Water retention
c. Hypovolemia
d. Hyponatremia
ANS: B
Among critically ill patients, water retention usually is evident when rapid weight gain occurs. In addition, such patients may have a reduced hematocrit, which is also consistent with hypervole-mia due to water retention.
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