A nurse is caring for a patient who smokes and drinks caffeine. Which point is important for the nurse to understand before assessing the patient's blood pressure (BP)?
a. Smoking increases BP for up to 3 hours.
b. Caffeine increases BP for up to 15 minutes.
c. Smoking result in vasoconstriction, falsely elevating BP.
d. Caffeine intake should not have occurred 30 to 40 minutes before BP measurement.
ANS: C
Smoking results in vasoconstriction, a narrowing of blood vessels. BP rises when a person smokes and returns to baseline about 15-20 minutes after stopping smoking. Caffeine increases BP for up to 3 hours. Be sure that patient has not ingested caffeine or smoked 20 to 30 minutes before BP measurement.
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