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Measurement and location of coronary ostia

Authors: Parimala Sirikonda,S.Sreelatha
Int J Biol Med Res. 2012; 3(4): 2489-2496  |  PDF File

Abstract

Aims: Classic anatomical dissection of 100 human heart specimens was performed to study the morphometric and topographic aspects of the coronary ostia. Method: The gross dissection was done by following the guidelines of Cunningham’s Manual. The pericardium involving the root of aorta was removed, and the origin of right and left coronary arteries was traced. The parameters included in the study were Number of coronary ostia, Location of coronary ostia in relation to intercommissural line (ICL), Diameter of coronary ostia, Distance of the coronary ostia from the bottom of the aortic sinus, Distance of the coronary ostia from the commissures of aortic leaflets on right and left sides of the ostia. Results: 71% specimens showed normal number of the coronary ostia i.e., one in anterior aortic sinus(AAS) and one in left posterior sinus (LPS). Third coronary artery (TCA) was found in 19%. 1specimen showed one ostium in the AAS and the ostium for left coronary artery (LCA) was absent in the LPS. 1 specimen showed two ostia in the LPS, one each for left anterior descending (LAD) and left circumflex (LCx). Right coronary ostium (RCO) was found arising below ICL In 62% and left coronary ostium (LCO) was below ICL in 44%. The mean diameter of RCO was 2.77mm and that of LCO was 4.11mm. The mean distance of the RCO from the bottom of the aortic sinus was 14.46mm and that of LCO was 14.3mm. The RCO was shifted more often from its normal position towards the commissure between anterior aortic sinus (AAS) and right posterior sinus (RPS). The LCO were more or less centrally placed in the left posterior sinus (LPS). Conclusion: Knowledge of and ability to recognize and identify the variety of sites of origin of coronary arteries of the human heart may help to overcome the potential difficulties in cardiothoracic surgical procedures.