چكيده لاتين :
Background- Chronic total occlusion (CTO) of the coronary arteries includes a wide spectrum of
lesions with a TIMI flow grade of 0 to I and more than four weeksי duration. The procedural
succe ss rate of percutaneous coronary intervention (PCI) in CTO not only depends on the
anatomy and morphology of the lesion but also, and most importantly, on the angiographic
TIMI flow grade of the lesion. The aim of this study was to show the procedural success rate
of PCI for different subtypes of CTO, according to the angiographic TIMI flow grade of
lesions.
Method- From March 2000 to March 2001 , PCI was performed in 60 cases with at least one CTO
lesion. Forty-six of the patients were male (76.66%), and their mean (±SD) age was 53.3
(±1O.37) years (range 35-72 years). Among these cases , 31 (51.66%) had complete total
occlusion (TIMI flow grade 0) and were designated as Group I, and 29 (48.33%) had
functional total occlu sion (TIMI flow grade I) and were designated as Group II. .
Results- The procedural success rate in complete total occlusion (Group I) was 64.5% and in
functional total occlusion (Group II) was 96.6% (P=0.002, CI=95%). The total success rate
was 80% (n=48) without any major procedural complications (MI, urgent CABG, or death) .
Conclusion- Although there are a few predictors for procedural succe ss for PCI in CTO lesions, it
seems that the TIMI flow grade (0 or I ) of the lesion is the most important and independent
predictor for procedural success (procedural success was defined as final residual stenosis less
than 50% with balloons and less than 20% with stents on visual assessment, and the absence
of major complications
