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

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

Type Origin Course of long LAD* Major branches
Short LAD 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
2. Intramyocardial course within septal crest emerging epicardially in the distal AIVG
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
  1. - The course of the short LAD is along the proximal AIVG in all types.
  2. - 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.