Length of left main coronary artery. Lack of correlation to coronary artery dominance and bicuspid aortic valve: an autopsy study of 54 cases.

Previous coronary angiographic data have suggested that the left main length of the coronary artery correlated with dominance (origin of the posterior descending branch) and bicuspid aortic valves. In our autopsy study with direct measurements of left main lengths, 41 patients with tricuspid aortic valves and 13 with bicuspid aortic valves were examined for right, left, or codominance. There was no statistically significant difference in either coronary dominance or the length of left main coronary artery between the congenital bicuspid and tricuspid aortic valves. Age, sex, heart weight, extent of coronary artery disease, left ventricular wall thickness, and site of prior infarction did not correlate with left main length or dominance. Thus, short left main lengths do not correlate with coronary dominance or with aortic valves. Angiographic assessment of left main coronary artery length is subject to magnification, oblique projection, and catheter position errors.