duke_treadmill_score: 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)

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.

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).

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

Run this code


# 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)

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