A patient asks the nurse why being NPO for 6 to 8 hours before a contrast study is necessary. Which response by the nurse is most accurate?
a. "Decreasing the hydration status decreases the chance of an allergic response to the contrast medium.".
b. "Excessive hydration causes dilution of the contrast medium, which does not per-mit as clear a picture of the area as needed.".
c. "It reduces the chance of postprocedure infection.".
d. "Nausea is prevented if the stomach is empty.".
B
Excessive hydration causes dilution of the contrast medium, making structures more difficult to see. The hydration status has not affected the chance of an allergic response to the contrast me-dium. Postprocedure infection is rare with a contrast study, and being NPO has nothing to do with its occurrence. Having an empty stomach does not prevent nausea. Nausea may result from the contrast medium used for the study.
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