e0702 Prevalence of anomalous coronary arteries

Objective Coronary arteries with an anomalous origin and course may occasionally cause sudden death. This is the first study of the prevalence of anomalous coronary arteries in an Asian population. Methods Over a 4 year period, consecutive patients who were referred to our centre for coronary CT angiogram were prospectively assessed for the prevalence of anomalous coronary arteries. Results Over the 4 year period, a total of 4500 were assessed. The prevalence of coronary artery anomalies is 0.78%. Coronary arteries can be considered anomalous as a result of single coronary artery or anomalous origin of coronary arteries. There were six of 4500 who had single coronary arteries of which five had absent right coronary artery (RCA) and one had absent left main coronary artery (LMCA). There were 29 patients who had anomalous origin of coronary arteries: four had anomalous left circumflex artery origin, 20 had anomalous RCA origin, four had origin of LMCA or LAD from RCA and one had origin of LMCA from the right coronary sinus. Hence, the commonest anomaly was anomalous origin of RCA. Conclusion The incidence of anomalous coronary arteries was 0.78% and the commonest coronary anomaly was anomalous origin of RCA.