As described by Rossi  the female arterial and luminal cross sectional areas are smaller than the male. In patients without atherosclerosis researchers have used intravascular ultrasound to inspect the left main (LM) and proximal left anterior descending (LAD) coronary artery segment and have found that female patients have smaller LM and LAD arterial and luminal area than men. Further multivaraite analysis done by Sheifer  established that sex (in spite of body size) is an independent accurate predictor of LA and LAD arterial areas.
This distinguished difference in coronary size may be a significant factor in the different outcomes of myocardial infarction and coronary revascularisation between men and women.
2. Sheifer, S.E., Canos, M.R., Wienfurt, K.P., Arora, U., Mendelson, F., Gersh, B., Weissman, N., (2000) Sex Differences in Coronary Artery Size Assessed by Intravascular Ultrasound. Am Heart J. 139: 649-53.