The Duke Treadmill Score (DTS) is a weighted index combining treadmill exercise time using standard Bruce protocol, maximum ST segment deviation (depression or elevation), and exercise-induced angina. It was developed to provide accurate diagnostic and prognostic information for the evaluation of patients with suspected coronary heart disease. Scores range from -25 (highest risk) to +15 (lowest risk). Duke treadmill score = exercise time - (5 x maximum ST segment deviation) - (4 x angina index), where angina index = 0 for no angina, 1 for non-limiting angina and 2 for exercise-limiting angina. (Duke University in North Carolina, where test first developed.)
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