<qa>  What is the proximal LCX?2. Ejection Fraction 30 and intervention in patient presenting with triple vessel disease. three-vessel or triple vessel disease is defined as at least one significant stenosis in all three major epicardial territories: Left Anterior Descending LAD Artery andor side branch, left circumflex LCX artery andor side branch, Right Coronary Artery RCA and or side branch. Significant stenosis is defined as at least 50 diameter stenosis by visual estimate or any total occlusion. In the case of left coronary artery dominance, a lesion in the LAD and the proximal LCX qualifies as three-vessel disease. 