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Abstract Introduction The introduction of percutaneous transluminal coronary angioplasty (PTCA) has been a break through in the practice of cardiology. When the National Heart Lung and Blood Institute (NHLBI) registry was performed in 1979, lesions considered appropriate for angioplasty were usually proximal, discrete subtotal, concentric imd non-calcified. Patients with single vessels disease were the only candidates for coronary angioplasty. Major improvement in the equipment and technique have permitted the safe and effective applications of coronary angioplasty in patients with less ideal anatomy ( Baim,1996) As coronary angioplasty balloons interact directly with vascular endothelium, lesion morphology has been an important predictor of initial and late outcome of PTCA (Myler,1994). A lot of work has been done to predict the acute success ofPTCA according to coronary morphology. In 1988, a combined American College of Cardiology I American Heart Association (AHA) task proposed a lesion classification scheme (ABC), estimating success and assessing risk for each class (Ryan et al.,1988) .However, ABC classification schemes are outdated and need to be changed for application in current angioplasty practice. The predictive value of ABC scheme, in the setting of the -----------------------·-·------------------------------------------------ |