Background: Radial access has become a more favored route for cardiac catheterization compared to transfemoral route; however, small radial arterial diameters can be a limitation especially for complex cases that may warrant the use of large arterial sheaths and catheters. The assessment of radial artery diameters prior to cardiac catheterization and intervention may be advantageous for the interventional cardiologist. The objective of this study is to measure the diameter of radial arteries in the study population, to identify the significant predictors of radial artery size, and to come up with an equation to predict radial artery size.
Method: The cross-sectional study included 111 adult patients who underwent coronary angiography and percutaneous coronary intervention via transradial approach. The participants' radial arteries were measured through radial artery angiography. Multivariate linear regression analysis was used to determine the significant predictors of radial artery size.
Results: Majority of the respondents were males (81.08%) with mean age of 55.40 ± 10.21 years. Radial artery diameters are widest in the proximal segment (mean= 2.52mm; 95% CI: 2.45-2.59mm), followed by the mid segment (mean=2.35mm; 95% CI: 2.28- 2.41mm), and the distal segment (2.22mm; 95% CI: 2.15- 2.29mm). Multivariate linear regression analysis showed that age, male gender, weight, and proximal wrist circumference were directly related to radial artery size while use of ACE inhibitor, height, BSA, and BMI were inversely related.
Conclusion: Radial artery size can be predicted by age, male gender, weight, and proximal wrist circumference, ACE inhibitor, height, BSA, and BMI. From these variables, radial artery size can be predicted using a derived equation.