Department of Anatomy, Kasturba Medical College, Manipal University, Manipal 576104, Karnataka, India.
Singapore Med J. 2013 Jan;54(1):49-52. doi: 10.11622/smedj.2013012.
Proficiency in the anatomy of coronary arteries and their variations is important for proper interpretation of coronary angiographies. The left coronary artery (LCA) commonly originates at the level of the left posterior aortic sinus and normally bifurcates into the anterior interventricular artery and circumflex artery. This study aimed to determine the variations in the LCA and its branches.
The study was conducted on 30 heart specimens. We observed the origin, length and branching pattern of the LCA and its coronary dominance.
We found a short main LCA trunk in three specimens and a long main LCA trunk in one specimen. In two specimens, the division of the LCA led to three branches. With regard to 'dominance', one specimen showed left dominance while another showed codominance.
Variations of the LCA are clinically relevant, especially when a perioperative coronary perfusion or coronary arteriography is performed.
熟练掌握冠状动脉及其变异的解剖结构对于正确解读冠状动脉造影至关重要。左冠状动脉（LCA）通常起源于左后主动脉窦的水平，并通常分为前降支和回旋支。本研究旨在确定 LCA 及其分支的变异情况。
本研究对 30 个心脏标本进行了研究。我们观察了 LCA 的起源、长度和分支模式及其冠状动脉优势。
我们发现三个标本中有短主 LCA 干，一个标本中有长主 LCA 干。在两个标本中，LCA 的分支导致了三支分支。关于“优势”，一个标本表现为左优势，另一个标本表现为共优势。
LCA 的变异具有临床相关性，特别是在进行围手术期冠状动脉灌注或冠状动脉造影时。
