Stress Testing Guidelines for Cardiovascular Disease

Indications and Contraindications

The American College of Cardiology recommends exercise ECG as the first-line stress test for patients who can exercise adequately and have an interpretable baseline ECG, as it provides both diagnostic information and functional capacity assessment at lower cost 1, 2
Exercise stress testing is contraindicated in patients with acute coronary syndrome, decompensated heart failure, severe symptomatic aortic stenosis, uncontrolled arrhythmias, acute aortic dissection, acute pericarditis or myocarditis, severe hypertension (≥200/110 mmHg), and acute pulmonary embolism 2, 3, 4, 5, 6

Exercise ECG is the primary indication for patients capable of achieving ≥5 METs of exercise with normal baseline ECG, providing functional capacity assessment, blood pressure response, heart rate recovery, and ECG changes during physiologic stress 1, 7
Exercise stress echocardiography is indicated for patients who can exercise but have uninterpretable baseline ECG, providing structural and functional information including valve gradients and pulmonary artery pressures 1, 3, 8
Pharmacologic stress testing with vasodilators (adenosine, dipyridamole, regadenoson) or dobutamine is reserved for patients unable to achieve adequate exercise, with specific indications and contraindications for each agent 1, 2, 3, 4

The American Heart Association recommends assessing exercise capacity and evaluating baseline ECG to determine the appropriate stress test modality, with exercise-based testing for patients who can exercise adequately and pharmacologic testing for those who cannot 1, 3
The European Society of Cardiology recommends using vasodilator nuclear imaging (regadenoson preferred) for patients without contraindications to vasodilators, and dobutamine stress echo for patients with contraindications to vasodilators or needing valve assessment 3, 8, 2

For preoperative risk assessment, exercise stress testing is recommended for patients who can exercise, and pharmacologic stress imaging for those who cannot 1, 3
For suspected coronary artery disease, exercise ECG is recommended for patients with intermediate pretest probability and normal ECG, and exercise or pharmacologic stress imaging for those with abnormal ECG 1
For known coronary disease, exercise stress testing is recommended for asymptomatic patients who can exercise, and stress imaging for patients with change in symptoms 1, 2

High-risk findings during stress testing include ST depression at low workload, failure to increase systolic BP, ST-segment elevation, complex ventricular ectopy, delayed heart rate recovery, large or multiple perfusion defects on nuclear imaging, and extensive wall motion abnormalities on stress echo 1, 2, 7, 8, 6

The American College of Cardiology and European Heart Society guidelines state that LBBB present during stress testing renders the ECG component non-diagnostic for ischemia 9
The European Society of Cardiology recommends that patients with LBBB require stress imaging (echocardiography, SPECT, or CMR) rather than ECG-only stress testing to evaluate for ischemia 9

A positive stress test for ischemia requires ≥1 mm horizontal or downsloping ST-segment depression lasting 60-80 milliseconds after the QRS complex, or ≥2 mm ST depression, or typical angina during exercise, according to the American Heart Association 10, 9
The American College of Cardiology guidelines classify failure to achieve adequate heart rate (typically <85% of age-predicted maximum) without symptoms or signs of ischemia as "insufficient heart rate for exercise testing" (≤12 bpm increase would be inadequate) 11, 12, 13

Exercise ECG testing is not of diagnostic value in the presence of LBBB, as ECG changes are not interpretable, as stated by the European Heart Society 9
The presence of LBBB itself is not a "positive result" - it simply means the ECG cannot be used to detect ischemia, necessitating imaging modalities, according to the European Society of Cardiology 9