الفهرس 
Introduction & Aim of the Present studyOnly 14 pages are availabe for public view
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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ABC classification schemes are outdated and need to be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
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