A case report of type VI dual left anterior descending coronary artery anomaly presenting with non-ST-segment elevation myocardial infarction

Table 1 Classification of dual left anterior descending coronary arteries [[1]]

Type	Origin		Course of long LAD^*	Major branches
Type	Short LAD	Long LAD	Course of long LAD^*	Short LAD	Long LAD
I	Proximal LAD	Proximal LAD	Epicardial course on the LV side of the proximal AIVG, reentering the distal AIVG	Septal	Diagonal
II	Proximal LAD	Proximal LAD	Epicardial course on the RV side of the proximal AIVG, reentering the distal AIVG	Septal and diagonal
III	Proximal LAD	Proximal LAD	Intramyocardial course in the proximal septum, then either emerging epicardially in distal AIVG or terminating intramyocardially as septal branches.	Diagonal	Septal
IV	LMCA	Proximal RCA	1. Epicardial course anterior to the RVOT continuing to the distal AIVG	Septal and diagonal
IV	LMCA	Proximal RCA	2. Intramyocardial course within septal crest emerging epicardially in the distal AIVG	Septal and diagonal
V	LCS	RCS	Intramyocardial course within the septal crest emerging epicardially in the distal AIVG	Septal and diagonal
VI	LMCA	Proximal RCA	Epicardial course between the RVOT and the aortic root, continuing to the mid or distal AIVG	Septal and diagonal	Diagonal

- The course of the short LAD is along the proximal AIVG in all types.
- LAD, left anterior descending artery; proximal LAD, the portion of the LAD from bifurcation of the left main coronary artery to the first diagonal branch; AIVG anterior interventricular groove; LV, left ventricle; RV, right ventricle; LMCA, left main coronary artery; proximal RCA, RCA from the ostium to the first curved portion; LCS, left coronary sinus; RCS, right coronary sinus; RVOT, right ventricular outflow tract.

ISSN: 1471-2261