Background: Heart disease is still one of the leading causes of mortality in our country and coronary angiography is still one of the golden methods of diagnosis for heart disease.There has always been some influence of factors such as age, sex and BMI, history of diabetes, hypertension, and clinical and paraclinical factors on the size of the arteries.

Aim: To evaluate the size of the radial and ulnar arteries and the factors affecting them in patients undergoing coronary angiography.

Method: This cross sectional study was done on 178 patients candidate for angiography or angioplasty referred to Imam Reza and Ghaem Hospitals of Mashhad from 2014 to 2015. We estimated ulnar, radial and brachial arteries size via angiography with calibration software in SIEMENS angiography machine. We also used a questionnaire for demographic data.

Result: One hundred seventy eight patients included in this study (Age: 59.71±12.08, 70 female and 108 male). There was no significant change about ulnar and radial size between sex and age parameters (P>0.05). The size of ulnar and radial arteries was significantly lower in diabetes and obese patients and higher in hypertensive groups (P< 0.05). We also reported the coronary anomalies and complications of the procedure.

Conclusion: We concluded that hypertension, Diabetes and obesity can effect on radial and ulnar size as an access for angiography or angioplasty.

Key words: Ulnar artery, radial artery, angiography, angioplasty, cardiac catheterization, risk factor