Dobrin Vassilev1, Robert Gil. 1. Invasive Cardiology Department, Central Hospital of the Internal Affairs and Administration Ministry, Warsaw, Poland. dobrinv@mail.bg
Abstract
OBJECTIVES: To verify in a clinical scenario a theory for predicting side branch (SB) stenosis after main vessel stent implantation in coronary bifurcation lesions. BACKGROUND: Many unresolved issues remain regarding SB compromise when the parent vessel is stented. METHODS: Bifurcation lesions (all Medina types) were subjected to angiographic analysis to determine the angle, defined as alpha, between the axes of the parent vessel and the SB. Using the prediction that the percent diameter stenosis (%DS) is equal to the cosine of angle alpha and relating it to a formula to determine the minimal lumen diameter (MLD) led to the following equation: MLD = ds x (1 -cos alpha); ds refers to the diameter of the SB. The predicted and observed SB stenosis values following angiography were compared. RESULTS: Fifty-two patients with 57 lesions were included in the analysis. Patient demographics and characteristics were similar to those in previous studies. There was a high coefficient of determination between the predicted and observed values of %DS (r(2)= 0.82, P < 0.001) and MLD (r(2)= 0.86, P < 0.001). We determined a cutoff value of 70% for predicted %DS for SB closure. When using multivariate regression analysis, the only predictor of SB ostial stenosis after stenting was alpha angle, whereas the predictors of MLD included the angle alpha and the RVD of the SB. CONCLUSIONS: Our analysis shows that the most powerful independent predictor of SB compromise is a new variable angle alpha.
OBJECTIVES: To verify in a clinical scenario a theory for predicting side branch (SB) stenosis after main vessel stent implantation in coronary bifurcation lesions. BACKGROUND: Many unresolved issues remain regarding SB compromise when the parent vessel is stented. METHODS: Bifurcation lesions (all Medina types) were subjected to angiographic analysis to determine the angle, defined as alpha, between the axes of the parent vessel and the SB. Using the prediction that the percent diameter stenosis (%DS) is equal to the cosine of angle alpha and relating it to a formula to determine the minimal lumen diameter (MLD) led to the following equation: MLD = ds x (1 -cos alpha); ds refers to the diameter of the SB. The predicted and observed SB stenosis values following angiography were compared. RESULTS: Fifty-two patients with 57 lesions were included in the analysis. Patient demographics and characteristics were similar to those in previous studies. There was a high coefficient of determination between the predicted and observed values of %DS (r(2)= 0.82, P < 0.001) and MLD (r(2)= 0.86, P < 0.001). We determined a cutoff value of 70% for predicted %DS for SB closure. When using multivariate regression analysis, the only predictor of SB ostial stenosis after stenting was alpha angle, whereas the predictors of MLD included the angle alpha and the RVD of the SB. CONCLUSIONS: Our analysis shows that the most powerful independent predictor of SB compromise is a new variable angle alpha.
Authors: Dobrin Iotkov Vassilev; Ghassan S Kassab; Carlos Collet; Juan Luis Gutiérrez-Chico; Gianluca Rigatelli; Robert J Gil; Patrick W Serruys Journal: Cardiol J Date: 2018-11-05 Impact factor: 2.737
Authors: Robert J Gil; Jacek Bil; Aleksandra Michałek; Dobrin Vassiliev; Ricardo A Costa Journal: Int J Cardiovasc Imaging Date: 2013-07-19 Impact factor: 2.357