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Cardiac Stress Testing Protocols Flashcards

7 cards from real CCI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Cardiac Stress Testing Protocols flashcards as text

  1. Which pharmacological agent used in stress testing works by causing coronary vasodilation through A2A adenosine receptor agonism?

    Answer: Regadenoson

    Regadenoson is a selective A2A adenosine receptor agonist that causes coronary vasodilation and is used as a pharmacological stress agent.

  2. A patient undergoing a dobutamine stress test develops a sustained ventricular tachycardia at 40 mcg/kg/min. What is the correct immediate action?

    Answer: Stop the dobutamine infusion immediately

    Sustained ventricular tachycardia is an absolute indication to immediately terminate the dobutamine infusion.

  3. During a Bruce protocol treadmill test, a patient achieves 85% of maximum predicted heart rate without symptoms or ECG changes. How should this test be classified?

    Answer: Diagnostic — adequate heart rate achieved

    Achieving ≥85% of maximum predicted heart rate (220 minus age) constitutes an adequate stress response, making the test diagnostically valid.

  4. Which finding during stress testing is considered a high-risk marker associated with severe three-vessel or left main coronary artery disease?

    Answer: Exercise-induced ST elevation in aVR with widespread ST depression

    ST elevation in aVR with widespread ST depression suggests diffuse subendocardial ischemia, indicating left main or proximal LAD disease.

  5. What is the primary reason dipyridamole is contraindicated in patients with active bronchospasm or severe reactive airway disease?

    Answer: It potentiates adenosine, which can cause severe bronchospasm

    Dipyridamole blocks adenosine reuptake, raising adenosine levels; adenosine stimulates A2B receptors causing bronchospasm in susceptible patients.

  6. A technologist notes that a patient scheduled for a pharmacological stress test consumed a large amount of caffeine before the study. What is the most appropriate action?

    Answer: Reschedule the test, as caffeine blocks adenosine receptors and will attenuate vasodilatory stress

    Caffeine is a competitive adenosine receptor antagonist that blunts the vasodilatory effect of adenosine-based agents, invalidating the test.

  7. During exercise stress testing, which blood pressure response is considered abnormal and associated with increased cardiovascular risk?

    Answer: Failure of systolic BP to rise above 10 mmHg from rest during maximal exercise

    Exertional hypotension or a flat BP response (rise <10 mmHg) suggests severe LV dysfunction or significant left main/proximal multi-vessel disease.