Correlation between Left main artery diameter derived by Finet’s Law and direct angiographic quantitative coronary dimension analysis

Abstract

Background and Aims: In the era of left main angioplasty, the aim of this study is to evaluate the applicability of Finet’s law in left main diameter calculation and establish this as a useful feasible alternative  tool to intravascular ultrasound  in the left main intervention.

Methods: A total of 164 patients who underwent coronary angiography at PAHS  due to suspicion of coronary artery disease between 1^st January 2017 and April 2020 were included. The left main diameter(d_o-QCA) was calculated using the Quantitative coronary angiographic (QCA) method and correlated with the Left main diameter (d_o-finets) derived from Finet’s law which takes into account the diameter (d₁) of the proximal left anterior descending artery (LAD) and left  circumflex (LCX) diameter (d₂) derived from QCA, added together and multiplied by the factor of 0.678 i.e d_o-finets=0.678(d₁+d₂).

Results: Using the Bivariate Pearson correlation method, d_o-QCA was found to have a positive correlation with d_o-finets with a correlation coefficient of (r=0.721) significant at the level of P value 0.01 (2-tailed).

Conclusion: The application of Finet’s Law using the QCA method has been found to be a handy feasible alternative tool to intravascular ultrasound   in calculating the left main diameter for the left main intervention where intravascular ultrasound  is not available or economic constraint prevails.