Answer: The Duke Treadmill Score (DTS) is an index combining treadmill exercise time using standard Bruce protocol, maximum net ST segment deviation (depression or elevation), and exercise-induced angina. It provides diagnostic and prognostic information in patients with suspected coronary heart disease.
DTS = Exercise Time - (5 x Max ST) - (4 x Angina Index)
- Treadmill exercise time in minutes
- Max ST = Maximum net ST deviation (except in lead aVR)
- Angina Index has 3 levels :: 0 = No angina during exercise, 1 = Non-limiting angina, 2 = Exercise limited angina
- More than or equal to +5 is Low risk
- +4 to -10 is Moderate risk
- Less than or equal to -11 High risk
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