Duke Treadmill Score Calculator
The Duke treadmill score calculator predicts the risk of ischemia or infraction in the heart. The Duke score is based on the treadmill exercise test and we use it to predict prognosis and plan further treatment for patients with suspected coronary artery disease.
In the article below to you will find more information about this coronary artery disease test and it's components.
We try our best to make our Omni Calculators as precise and reliable as possible. However, this tool can never replace professional medical advice.
Coronary artery disease
Coronary artery disease (CAD) is the most common type of heart disease in the United States. Its other names include coronary heart disease or ischemic heart disease. For some people, the first sign of CAD can be a heart attack; however, many patients experience various symptoms of this illness beforehand.
Coronary artery disease is caused by plaque buildup in the walls of the arteries, which supply blood to the heart, and other parts of the human body. The plaque, built from cholesterol and other substances, successively narrows the arteries, which limits the blood flow or can block it entirely.
The symptoms and complications of CAD include:
- chest pain and discomfort;
- heart attack (weakness, nausea, angina, chest pain, cold sweat, and shortness of breath); and
- heart failure (dyspnea, fatigue, shortness of breath, swelling in the legs, rapid and irregular heartbeat).
The risk factors for CAD include:
If a patient is at a high risk of heart disease or already has symptoms, the doctor can use several tests to diagnose CAD. One of the coronary artery disease tests is exercise stress test. Use the Duke treadmill score calculator to obtain the information required to assess the patient's health.
Duke treadmill score
The Duke Treadmill Score is a weighted index using treadmill exercise time (performed according to the standard Bruce protocol), maximum net ST-segment deviation (depression or elevation), and exercise-induced angina. It was developed to provide diagnostic and prognostic information to help evaluate patients with suspected coronary heart disease.
The typical observed range for Duke treadmill score starts from -25 (the highest risk) up to +15 (the lowest risk).
The Duke score equation is as following:
Duke score = exercise – 5 * ST-segment dev. – 4 * TAI,
exerciseis the duration of exercise expressed in minutes;
ST-segment dev.is the maximal net ST-segment deviation expressed in millimeters. ST deviation refers to maximum ST change (elevation or depression) in any lead except lead aVR; and
TAIis the Treadmill Angina Index, that we can describe as follows:
Coronary artery disease test (Duke score) - interpretation
According to the Duke treadmill score, patients are categorized as low-risk, intermediate-risk or high-risk.
Interpretation is based on a paper by Mark BD et al. 1991:
Duke treadmill score calculator - a practical example
Let's use a practical example to show how the Duke treadmill score calculator works.
The patient named Susan took a Duke treadmill test. She was exercising for 8 minutes, and didn't experience any pain during the test. Her maximal net ST-segment deviation was equal to 0.6 mm.
The Duke score will be calculated as follows:
Duke score = exercise – 5 * ST-segment dev. – 4 * TAI
Duke score = 8 min – 5 × 0.6 mm – 4 × 0
Duke score = 8 - 3
Duke score = 5
Interpretation: Susan is a low-risk patient.
|Score||Risk group||Survival at 4 years|
|-10 to 4||Medium||95%|