Congenital anomalies of the coronary arteries are present in 0.2-1.4% of the general population. [1] Double right coronary artery (RCA) is a very rare coronary artery anomaly with an incidence of 0.01%. [2] Different authors have used different terminologies for the definition of double RCA like dual RCA, split RCA, duplicated RCA, and other terminologies. Nair et al. [3] suggested in conventional coronary angiography that both RCA vessels run parallel in the right atrioventricular groove and both cross the crux. Kunimasa et al. [4] Sato et al.[5] proposed that double RCA should be defined when both supply the blood to the inferior left ventricular (LV) myocardium; thus, both RCAs should course downwardly to reach the interventricular sulcus whether or not they cross the crux. Lemburg et al. [6] suggested that adjacent but separate ostia of two RCA vessels with almost similar diameters indicate the presence of true double RCA. Misuraca and Balbarini [7] described a right coronary system formed of two distinct branches running very closely together in the atrioventricular groove. The two branches are of a similar caliber and can originate from a single proximal trunk or arise from distinct orifices in the right sinus of Valsalva. The double coronary artery is considered hemodynamically insignificant. It is not immune to atherosclerosis. Because of duplication, it provides better collateral support in case of left coronary atresia or total occlusion...................................
http://www.nigjcardiol.org/article.asp?issn=0189-7969;year=2016;volume=13;issue=2;spage=157;epage=158;aulast=Barik
http://www.nigjcardiol.org/article.asp?issn=0189-7969;year=2016;volume=13;issue=2;spage=157;epage=158;aulast=Barik
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