Coronary artery anomalies: Unusually high incidence of anomalies with a malignant course in an Asian population.

Objectives: Coronary artery anomalies are uncommon, but important cardiac malformations, representing the second commonest cause of death in young athletes.

Methods: We utilized computerized tomographic angiography to screen and precisely delineate coronary artery anomalies in patients with minimal cardiac symptoms.

Results: During 3.5-year period, we performed 2888 computerized tomographic angiographies. A total of 33 (1.1%; 95% confidence interval = 0.7-1.5) cases of coronary artery anomalies were identified (mean age = 44 ± 13.5 (15-70) years). In total, 23 patients (mean age = 43 years) had malignant coronary artery anomalies with an inter-arterial course of the aberrant vessel: of which 3 had left main coronary artery arising from right coronary sinus and 20 right coronary artery from left sinus; 19 patients were of Asian and 14 were of Arab origins. Of interest, 21 out of 33 patients had chest pain, 5 had palpitations, and 2 had breathlessness. There were no examples of sudden cardiac death. All patients received appropriate advice regarding physical exertion and medical management, and remained well for 2-5 years of follow-up. Of 33 patients, 4 had significant symptomatic coronary artery disease requiring intervention: 1 percutaneous coronary intervention and 3 coronary artery bypass graft surgery.

Conclusion: There is a relatively high incidence of coronary artery anomalies with malignant course in Asians. The vast majority were managed conservatively.