Duke Treadmill Score Calculator

The calculation is based on a standard clinical formula that weights three critical physiological variables recorded during a stress test. The core equation is: Duke Score = Exercise Time - (5 × ST Deviation) - (4 × Angina Index). Here, 'Exercise Time' is measured in total minutes on a standard Bruce protocol, 'ST Deviation' represents the maximum millimeter displacement of the ST-segment, and the 'Angina Index' is scored as 0 for no angina, 1 for non-limiting angina, and 2 for angina that forces the termination of the test.

Imagine a patient undergoing a treadmill stress test who completes 9 minutes of total exercise time on the treadmill. During the test, they experience 1.5 millimeters of ST-segment depression (ST Deviation = 1.5). They also report mild angina that does not force them to stop the test prematurely (Angina Index = 1). Plugging these values into our formula gives: 9 - (5 × 1.5) - (4 × 1). First, calculate the adjustments: 5 × 1.5 = 7.5, and 4 × 1 = 4. Subtracting these from the exercise time yields: 9 - 7.5 - 4 = -2.5. A final Duke Treadmill Score of -2.5 places this patient in the moderate-risk category, indicating that further clinical follow-up may be warranted.

Ensure that all electrocardiogram readings are interpreted by a qualified medical professional to measure ST-segment changes accurately. Always record exercise time in precise fractional minutes rather than rough estimates to maintain mathematical accuracy. Use this score as a supplementary screening guide rather than a standalone diagnosis for coronary artery disease.