CCI - Cardiovascular Credentialing International Cardiac Stress Testing Protocols Questions and Answers — Questions and Answers
Question 1: An 82-year-old female with limited mobility due to severe osteoarthritis is referred for a symptom-limited stress test to evaluate exertional dyspnea. Which of the following treadmill protocols would be most appropriate for this patient?
- Standard Bruce Protocol
- Dobutamine Stress Protocol
- Naughton Protocol (Correct answer)
- Ellestad Protocol
Correct answer: Naughton Protocol
The Naughton protocol is designed for deconditioned or elderly patients. It begins at a very low workload and increases the intensity in smaller, more gradual increments (typically 1 MET per stage) compared to the Standard Bruce or Ellestad protocols, making it more suitable for patients with limited exercise capacity. [3, 26] Dobutamine is a pharmacologic agent, not a treadmill protocol.
Question 2: What are the defining characteristics of each stage in the standard Bruce treadmill protocol?
- The speed increases every 2 minutes while the grade remains constant.
- The grade increases every 3 minutes while the speed remains constant.
- The speed and grade both remain constant, but the duration of exercise is extended.
- The speed and grade both increase every 3 minutes. (Correct answer)
Correct answer: The speed and grade both increase every 3 minutes.
The standard Bruce protocol is characterized by 3-minute stages where both the treadmill speed and the percent grade (incline) are increased simultaneously, leading to significant jumps in metabolic equivalents (METs) between stages. [11, 22, 25]
Question 3: A patient undergoing a dobutamine stress echocardiogram is unable to reach their target heart rate with the maximal dobutamine infusion. Which medication is commonly administered adjunctively to help achieve the target heart rate?
- Atropine (Correct answer)
- Metoprolol
- Adenosine
- Lidocaine
Correct answer: Atropine
Atropine is frequently used during dobutamine stress tests when the heart rate response is suboptimal. It is an anticholinergic agent that blocks the vagus nerve's effect on the heart, thereby increasing the heart rate to help reach the diagnostic target. [15] Metoprolol is a beta-blocker and would have the opposite effect.
Question 4: According to ACC/AHA guidelines, which of the following is considered an absolute indication to terminate an exercise stress test?
- Patient request to stop
- ST-segment depression of 2 mm
- Development of multifocal PVCs
- Drop in systolic blood pressure >10 mmHg from baseline, accompanied by other evidence of ischemia (Correct answer)
Correct answer: Drop in systolic blood pressure >10 mmHg from baseline, accompanied by other evidence of ischemia
A drop in systolic blood pressure of more than 10 mmHg from baseline during exercise, especially when accompanied by other signs of ischemia (like angina or significant ECG changes), is an absolute indication for immediate test termination due to the risk of severe myocardial dysfunction. [1, 2, 10] The other options are generally considered relative indications for termination.
Question 5: A 55-year-old patient is scheduled for a treadmill stress test. What is the patient's age-predicted maximum heart rate (APMHR), and what is the heart rate corresponding to 85% of the maximum, a common target for a diagnostically adequate study?
- APMHR: 175 bpm; 85% Target: 149 bpm
- APMHR: 165 bpm; 85% Target: 140 bpm (Correct answer)
- APMHR: 155 bpm; 85% Target: 132 bpm
- APMHR: 160 bpm; 85% Target: 145 bpm
Correct answer: APMHR: 165 bpm; 85% Target: 140 bpm
The most commonly used formula to estimate age-predicted maximum heart rate is 220 minus the patient's age. For a 55-year-old: 220 - 55 = 165 bpm. To find the 85% target, calculate 165 * 0.85, which equals 140.25, rounded to 140 bpm. [8, 16, 22]
Question 6: A patient with a history of severe, active bronchospastic asthma requires a pharmacologic stress test. Which of the following agents is most strongly contraindicated?
- Dobutamine
- Adenosine (Correct answer)
- Isoproterenol
- Regadenoson
Correct answer: Adenosine
Adenosine (and Dipyridamole) can cause significant bronchospasm and is contraindicated in patients with active wheezing or severe reactive airway disease. [4, 9, 14] Regadenoson is a more selective A2A agonist with a lower risk of bronchospasm, but caution is still advised. Dobutamine is an inotropic agent and is generally considered the safest pharmacologic stress agent for patients with severe bronchospastic disease. [4, 14]
CCI - Cardiovascular Credentialing International Cardiac Stress Testing Protocols Questions and Answers
An 82-year-old female with limited mobility due to severe osteoarthritis is referred for a symptom-limited stress test to evaluate exertional dyspnea.
Which of the following treadmill protocols would be most appropriate for this patient?