RN Nursing · Cardiovascular Assessment · Practice question
A client is scheduled for an exercise stress test. Which instruction is correct?
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"You should smoke a cigarette right before the test to relax."
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✓
"Do not eat or drink anything containing caffeine for 24 hours before the test."
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"Wear heavy, warm clothing during the test."
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"Take your Beta-blocker medication the morning of the test."
Answer & explanation
Correct: "Do not eat or drink anything containing caffeine for 24 hours before the test."
Before an exercise stress test, caffeine must be avoided for at least 24 hours because caffeine is a stimulant that can elevate heart rate and blood pressure, potentially masking ischemic changes or producing a false-negative result. The test is designed to evaluate cardiac response to controlled physical exertion, and any substance that independently alters cardiovascular parameters would compromise diagnostic accuracy. Smoking before the test would be dangerous and counterproductive — nicotine causes vasoconstriction and tachycardia, which could both artificially skew results and increase the risk of a cardiac event during the test. Wearing heavy, warm clothing is incorrect because the test requires appropriate exercise attire; overheating during exertion adds unnecessary cardiovascular stress unrelated to cardiac disease. Taking a beta-blocker the morning of the test is incorrect for most stress test protocols because beta-blockers reduce heart rate and blunt the cardiac response to exercise, making it difficult or impossible to achieve the target heart rate needed to evaluate for ischemia — many providers instruct clients to hold beta-blockers 24 to 48 hours beforehand unless the purpose is specifically to evaluate medication efficacy. Therefore, avoiding caffeine for 24 hours is the only instruction among these options that correctly prepares the client for a valid, safe exercise stress test.
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