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[The ergometry stress test in patients with stenosis of the left main coronary artery]
R Panovský1, Z Stárek, J Meluzín
1I. interní-kardioangiologická klinika FN U sv. Anny, Brno.
Insights
Ergometric loading tests in patients with ischaemic heart disease cannot predict significant left main coronary artery stenosis. This study found no significant differences in most ergometric parameters between patients with and without this critical finding.
Area of Science:
- Cardiology
- Diagnostic Testing
- Ischaemic Heart Disease
Background:
- Ischaemic heart disease (IHD) is a major cause of mortality.
- Accurate diagnosis of coronary artery stenosis is crucial for patient management.
- Left main coronary artery stenosis represents a high-risk subgroup of IHD.
Purpose of the Study:
- To evaluate the predictive value of ergometric loading tests for significant left main coronary artery stenosis.
- To compare ergometric parameters in patients with and without left main coronary artery stenosis.
Main Methods:
- 168 patients with IHD underwent bicycle ergometer testing before coronary angiography.
- Group A (n=19) had significant left main coronary artery stenosis.
- Group B (n=20) had coronary heart disease without left main involvement.
Main Results:
- A significant difference was observed in total load time (Group A: 6.21 min vs. Group B: 7.94 min, p < 0.05).
- No significant differences were found in other ergometric parameters, including work performed, ST segment depression, and onset of angina.
- These findings indicate limited utility of ergometry in identifying left main coronary artery stenosis.
Conclusions:
- Ergometric loading tests are not reliable for predicting significant left main coronary artery stenosis.
- Coronary angiography remains the gold standard for diagnosing left main coronary artery disease.
- Further research may explore advanced non-invasive imaging techniques for this specific indication.
Abstract:
In 168 patients with ischaemic heart disease an ergometric loading test on a bicycle ergometer was made before coronarography. A total of 19 patients had on coronarography a finding of significant stenosis of the lumen of the trunk of the left coronary artery--group A. These patients were compared with a control group of 20 patients with confirmed coronary heart disease (narrowing of the diameter of the lumen by 50 or more percent) without affection of the trunk of the left coronary artery-group B. As to the investigated parameters of the ergometric test the two groups differed significantly in the total time of the load (group A: 6.21 minutes, group B: 7.94 minutes, p < 0.05), while in all other parameters--total amount of performed work, sum of depressions of the ST segments during a maximum load, time of onset of stenocardias, time since development of 1 mm depressions of the ST segment, maximal depression of the ST segment in lead V5 and number of leads with ST depressions above 1 mm--no significant difference was found. From the work ensues that from the ergometric loading test the finding of stenosis of the left coronary artery on coronarography cannot be predicted.