duke_treadmill_score: Duke Treadmill Score

In cliot: Clinical Indices and Outcomes Tools

Duke Treadmill Score

Description

Calculates the Duke Treadmill Score (DTS), a widely used prognostic tool for patients undergoing exercise treadmill testing. The score predicts 5-year mortality and stratifies patients into low, moderate, and high-risk categories based on exercise capacity, ST-segment deviation, and exercise-induced angina.

Usage

duke_treadmill_score(exercise_time_min, max_st_depression_mm, angina_index)

Arguments

exercise_time_min	Numeric. Total exercise time in minutes using the Bruce protocol.
max_st_depression_mm	Numeric. Maximum net ST-segment deviation (depression or elevation) in millimeters during or after exercise (relative to baseline).
angina_index	Numeric (0, 1, or 2). Exercise-induced angina. 0: No angina. 1: Non-limiting angina (occurred but test continued). 2: Limiting angina (test stopped due to angina).

Value

A list containing:

Duke_Score	The calculated DTS score (Range typically -25 to +15).
Risk_Group	Classification (Low >= +5, Moderate -10 to +4, High < -10).
Annual_Mortality_Risk	Estimated annual mortality rate.
Five_Year_Survival	Estimated 5-year survival rate.

References

Mark DB, Hlatky MA, Harrell FE Jr, et al. Exercise treadmill score for predicting prognosis in coronary artery disease. Ann Intern Med. 1987;106(6):793-800. doi:10.7326/0003-4819-106-6-793

Examples

# Example 1: Low Risk
# 10 minutes exercise, 0mm ST depression, No Angina
# Score = 10 - 0 - 0 = 10
duke_treadmill_score(10, 0, 0)

# Example 2: High Risk
# 3 minutes exercise, 2mm ST depression, Limiting Angina
# Score = 3 - (5*2) - (4*2) = 3 - 10 - 8 = -15
duke_treadmill_score(3, 2, 2)

cliot documentation built on Dec. 1, 2025, 1:06 a.m.