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Figure 1 The Bypass Angioplasty Revascularization Investigation coronary artery map. Right coronary artery: 1 = proximal; 2 = middle; 3 = distal; 4 = posterior descending; 5 = right posteroatrioventricular; 6 = first posterolateral; 7 = second posterolateral; 8 = third posterolateral; 9 = inferior septal artery; 10 = acute marginal artery. Left coronary artery: 11 = left main; 12 = proximal left anterior descending; 13 = middle left anterior descending; 14 = distal left anterior descending; 15 = first diagonal; 15a = first diagonal branch; 16 = second diagonal; 16a = second diagonal branch; 17 = anterior septals; 18 = proximal circumflex; 19 = middle circumflex; 19a = distal circumflex; 20, 21, 22 = first, second and third obtuse marginal; 20a, 21a, 22a = first, second and third obtuse marginal branches; 23 = left atrioventricular; 24, 25, 26 = first, second and third posterolaterals; 27 = left posterior descending; 28 = Ramus; 28a = Ramus branch; 29 = third diagonal; 29a = third diagonal branch.