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Identifying priority patients for coronary angiography
1Stepping Hill Hospital, Stockport, Cheshire, UK.
Insights
The Duke treadmill score effectively identifies patients needing coronary intervention. High-risk individuals are significantly more likely to have significant stenosis and require procedures like percutaneous transluminal coronary angioplasty or coronary artery bypass grafting.
Area of Science:
- Cardiology
- Diagnostic Accuracy
- Exercise Physiology
Background:
- Coronary artery disease diagnosis relies on accurate risk stratification.
- Identifying patients who require urgent coronary intervention is crucial for timely treatment.
- The Duke treadmill score is a proposed tool for assessing coronary artery disease risk.
Purpose of the Study:
- To validate the Duke treadmill score's ability to identify patients likely to need coronary intervention.
- To assess the correlation between Duke treadmill score risk categories and significant coronary stenosis.
- To determine if the Duke treadmill score independently predicts the need for percutaneous transluminal coronary angioplasty or coronary artery bypass grafting.
Main Methods:
- An open observational study with blinded endpoint evaluation was conducted.
- 101 consecutive patients referred for coronary angiography underwent the Bruce protocol exercise test.
- The Duke score was calculated using exercise time, ST segment deviation, and angina index.
Main Results:
- Patients classified as high-risk by the Duke score were significantly more likely to have significant stenosis (p=0.01) and require coronary intervention (p<0.001).
- The Duke treadmill score independently predicted significant stenosis (p=0.002) and the need for coronary intervention (p=0.001) in logistic regression analysis.
- The score demonstrated good predictive value, with high-risk patients having an odds ratio of 4.59 for significant stenosis and 7.21 for requiring intervention.
Conclusions:
- The Duke treadmill score is a valuable tool for identifying patients at high risk of significant coronary artery stenosis.
- The score accurately predicts the need for coronary intervention, including percutaneous transluminal coronary angioplasty and coronary artery bypass grafting.
- Implementing the Duke treadmill score can aid in prioritizing investigations for patients with suspected coronary artery disease.
Abstract:
We conducted an open observational study with blinded endpoint evaluation to validate the use of the Duke treadmill score in identifying patients likely to require coronary intervention. We studied 101 consecutive patients referred for coronary angiography from a cardiology clinic. All patients had a Bruce protocol exercise test. A 70% stenosis was regarded as significant. Patients were referred for percutaneous transluminal coronary angioplasty (PTCA) or coronary artery bypass grafting (CABG) surgery, if indicated. The Duke score was calculated as follows: exercise time (min) - (5 x ST segment deviation [mm]) - (4 x angina index [text]). Patients were classified into low, medium and high risk. The patients at high risk are more likely to have a significant stenosis (53/58 vs 30/43: p = 0.01 [OR 4.59 95% CI 1.34-16.6]) and require CABG or PTCA (47/58 vs 16/43: p < 0.001 [OR 7.21 95% CI 2.69-19.8]) than those at medium/low risk. Multiple logistic regression analysis, including ST segment depression, exercise time and symptoms shows that the score independently predicts a significant stenosis (p = 0.002) and the need for coronary intervention (p = 0.001). Introducing the score can help to identify those patients who need priority investigation.