Duke Treadmill Score (DTS)
Predict prognosis and risk for patients undergoing treadmill stress testing.
Duke Treadmill Score:
About the Duke Treadmill Score
The Duke Treadmill Score (DTS) is a widely used composite score that helps cardiologists assess the prognosis of patients with suspected coronary artery disease (CAD). It combines three key elements from an exercise stress test: exercise duration, ST-segment deviation, and angina symptoms.
The Formula
The calculation is as follows:
DTS = Duration (min) - (5 × Max ST Deviation mm) - (4 × Angina Index)
- Duration: Total minutes walked on the treadmill (typically using the standard Bruce protocol).
- ST Deviation: The maximum net ST-segment depression or elevation compared to baseline, measured in millimeters (mm).
- Angina Index:
- 0: No angina during exercise.
- 1: Non-limiting angina (chest pain occurred but patient could continue).
- 2: Exercise-limiting angina (pain forced the patient to stop).
Risk Stratification
| Risk Category | DTS Score | Est. Annual Mortality |
|---|---|---|
| Low Risk | ≥ +5 | < 0.5% |
| Moderate Risk | +4 to -10 | ~ 2.5% |
| High Risk | < -10 | > 5.0% |
Note: High-risk patients are typically referred for coronary angiography. Low-risk patients can often be managed safely without invasive procedures. This tool is for educational purposes and is not a substitute for professional medical advice.