With the ever increasing load of coronary heart disease, an in-depth study of the coronary arteries has been felt by the medical faculties. Also it can be seen that Coronary arteries show wide variations among different populations. Hence based on the above findings this study had been planned to focus on the pattern of coronary dominance in patients from the Bihar region Invasive coronary angiography was performed by either femoral or radial route using radio-opaque dye and cineangiograms were taken in different views. Using Schlesinger’s criteria, the coronary dominance was determined by eminent cardiologist. The above results prove that there are wide regional variations in dominance pattern. These variations should always be borne in mind for better cardiac care. These findings correlated with angiographic study may result in developing a comprehensive epidemiological data pool. These data may be helpful in planning research.