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Coronary artery disease confined to secondary branches of the left coronary system
Insights
Coronary branch disease, affecting only specific arteries, is rare in patients undergoing catheterization. Despite symptoms mimicking major coronary artery disease, these cases show a benign prognosis and respond well to medical therapy.
Area of Science:
- Cardiology
- Interventional Cardiology
Background:
- Coronary artery disease (CAD) typically affects major epicardial arteries.
- Limited data exists on isolated disease affecting only coronary artery branches.
Purpose of the Study:
- To investigate the prevalence, clinical characteristics, and outcomes of coronary artery disease limited to specific branches.
Main Methods:
- Retrospective analysis of 3,000 patients undergoing coronary arteriography over 4 years.
- Detailed assessment of coronary branch disease, including stenosis severity, graft suitability, and collateral circulation.
- Evaluation of clinical presentation, risk factors, and diagnostic test results (exercise ECG, thallium scans).
Main Results:
- 31 patients (1%) presented with isolated coronary branch disease (diagonal, marginal branches).
- Most patients (21/31) had severe stenosis (≥70%).
- Clinical presentation and risk factors were similar to major CAD; however, left ventricular function remained preserved.
Conclusions:
- Isolated coronary branch disease is a rare finding in catheterized patients.
- Clinical presentation is indistinguishable from more extensive CAD.
- Prognosis is benign, with a favorable response to medical management.
Abstract:
Among 3,000 patients studied by coronary arteriography during a 4-year period, 31 patients (1%) had coronary artery disease limited to a diagonal branch of the left anterior descending (15 patients), marginal branch of the left circumflex (10 patients), or to both branches (6 patients). Ten patients had 50-69% and twenty-one had greater than or equal to 70% diameter narrowing. The suitability for grafting was noted in 20 patients as judged by the caliber and distribution of the diseased branches. Collaterals were noted in seven patients. Disease was present in 28 men and 3 women (age range 38-70 years). At least one major coronary risk factor was present in 27 patients. Angina was noted in 27 patients; prior myocardial infarction was noted in 5 patients by history and in 4 by ECG. The left ventriculogram was normal in 22 patients and showed mild segmental asynergy in 9; ejection fraction was normal in all. Exercise ECGs were positive in 12 of 25 patients; exercise 201thallium scans were positive in 13. All patients responded to medical therapy. In conclusion, among the population of patients who undergo catheterization, coronary branch disease is rare. The clinical findings are indistinguishable from patients with major coronary disease. Prognosis remains benign and patients respond to medical therapy.