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Prediction of "critical" coronary disease: are the "Consensus Conference" guidelines adequate?
S J Hutchison1, M W Millar-Craig
1University Department of Medical Cardiology, Royal Infirmary, Glasgow, Scotland.
Insights
Symptoms like angina and resting ECGs are unreliable for predicting critical coronary artery disease. Exercise testing is more effective, and a structured management plan could identify most patients needing further investigation.
Area of Science:
- Cardiology
- Internal Medicine
Background:
- Left main coronary stenosis (LMCS) is a critical condition often presenting with diverse symptoms.
- Accurate prediction of LMCS is vital for timely intervention and improved patient outcomes.
Purpose of the Study:
- To review the presenting features of patients with significant left main coronary stenosis (LMCS).
- To evaluate the utility of resting electrocardiogram (ECG) and exercise testing in predicting critical coronary disease.
Main Methods:
- Retrospective review of clinical data from 100 patients diagnosed with significant LMCS.
- Analysis of presenting symptoms (angina severity, unstable angina) and diagnostic test results (resting ECG, exercise testing).
Main Results:
- Angina was the primary symptom, occurring at various exertion levels or as unstable angina in a subset of patients.
- Resting ECG was normal in 44% of patients, highlighting its limitations.
- Exercise testing demonstrated high sensitivity, with 92% of tested patients showing positive results.
Conclusions:
- Resting ECG and symptom severity alone are insufficient for predicting critical coronary artery disease.
- Exercise stress testing is a valuable tool for identifying patients with significant LMCS.
- A structured management approach, such as that proposed by consensus conferences, can effectively identify patients requiring coronary angiography.
Abstract:
Presenting features of 100 patients with significant left main coronary stenosis (LMCS) were reviewed. All presented with angina--on minimal exertion in 45, moderate exertion in 38, and severe exertion in 6--and 11 had unstable angina. Although the resting ECG was normal in 44, exercise testing was positive in 92% of patients tested. The authors conclude that symptoms and the resting ECG alone are unhelpful in predicting "critical" coronary disease. However, application of a management plan similar to that suggested by the Consensus Conference on coronary artery surgery would have selected the vast majority of such patients for angiography.