Background: This study aims to define normal coronary artery diameters of males and females in a sample of Turkish population, compared to Asian-Indian and Western Caucasian populations.

Methods: Angiographic and demographic data of a total of 324 patients (147 males, 177 females; mean age 55.3±10.1 years; range, 32 to 82 years) who underwent elective coronary angiography with angiographically normal coronary arteries between July 2017 and March 2019 were analyzed retrospectively. Proximal diameters of major epicardial coronary arteries were measured using the Axiom Artis software according to edge detection method. All the measurements were adjusted to the body surface area. Unadjusted and adjusted values were compared between genders and with the Asian-Indian and Caucasian population samples.

Results: The mean diameters of unadjusted/adjusted left main coronary artery, proximal left anterior descending artery, proximal left circumflex artery, and proximal right coronary artery were 4.5±0.6 mm/2.4±0.4 mm/m², 3.7±0.5 mm/1.9±0.3 mm/m², 3.3±0.6 mm/1.7±0.3 mm/m², and 3.4±0.6 mm/1.8±0.4 mm/m², respectively. Adjusted left main coronary artery and proximal left circumflex artery were narrower, and unadjusted proximal left anterior descending artery and unadjusted/adjusted proximal right coronary artery were larger in men, compared to women in the Turkish population. Turkish population had similar body surface area and unadjusted/adjusted coronary diameters with Caucasians, whereas adjusted proximal left anterior descending artery was larger in the Turkish population than in Asian-Indians.

Conclusion: Our study findings on the Turkish population contradict the traditional belief that women have narrower coronary arteries then men. Furthermore, the Turkish population have comparable adjusted/unadjusted coronary diameters with the Western Caucasians, but larger adjusted/unadjusted proximal left anterior descending artery, compared to Asian-Indians. We believe that our findings may contribute to the global data pool of normal coronary diameters and can be utilized in future studies as a database.

Keywords : Epidemiology, normal coronary diameter, quantitative coronary angiography Turkish population