Abstract:
The numbers of cardiovascular was most cause of death in worldwide as same as in Thailand. The knowledge of anatomical pattern, variations, and anomalies of coronary arteries would be important for proper interpretation of the coronary angiographies. This research aimed to study toward the locations and numbers of both coronary orifices, the variations and abnormalities of the coronary arteries, the difference between both genders, and the association between coronary arteries. Ninety-five heart specimens of both genders were dissected. The most common was one orifice in each aortic cusp (68.42%). In axial plane, the left and right orifices sited in the middle third (61.05%) and posterior third most (45.16%). Both orifices located below the sinotubular junction in 92.63% and 97.48%, respectively. The distance from bottom of aortic cusp to the left and right orifices were 11.59±1.91 mm. and 11.73±2.43 mm. The diameter of left main trunk and right coronary artery (RCA) were 5.52±0.95 mm. and 4.75±1.05 mm. The length of left main trunk was 12.36±4.21 mm. For the left coronary artery (LCA), the incidence of trifurcation, the termination of anterior interventricular artery (AIA) beyond apex (55.79%), two branches of diagonal artery (DA), the termination of circumflex artery (CxA) between left margin and crux cordis (47.36%), one branch of lateral branch and left marginal artery at the left margin of heart were mostly found. For the RCA, the incidence of sinoatrial node artery from RCA (42.11%), the conus artery and the right dominance were mostly found. The incidence of right posterior diagonal artery (RPDA), left retroventricular artery (LRVA) and myocardial bridge (MB) were 45.26%, 87.37% and 62.11%. The atypical origin of RCA from the left sinus was found in 1.05%. There was no statistically significant difference between genders for median artery, MB and dominant pattern. The association between the termination of CxA and the incidence of LRVA was found, but conversely, the termination of AIA and type of posterior interventricular artery (PIA), the incidence of RPDA and type of PIA was not found. The expected benefit was to be the database of coronary arteries while performing a procedure of revascularization.