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切面
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Table of Contents | ||||||||||
Copyright 2001, Yale University School of Medicine. All rights reserved. | February 22, 2001 (PL) |
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袁老师讲解冠脉受累病例的节段室壁运动异常
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姚老师和熊老师现场解剖猪心讲解切面和17节段
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宋老师和助教学员
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Copyright 2007 Cardiovascular Anthology
Dominant Left Coronary Artery |
[size=+1] In 15% of patients the right coronary artery (RCA) is said to be "non dominant" because it does not supply circulation to the inferior portion of the inter-ventricular septum via right posterior descending coronary artery or PDA branch. In 8% of cases the left coronary artery (LCA) is dominant because it gives of the postero-lateral artery (PLA) and then travels to the cross-section of the AV groove and the posterior inter-ventricular (IV groove) where it gives rise to the left posterior descending coronary artery (PDA) that travels in the posterior IV groove and gives off several septal perforator branches (SP). The SP supply blood to the lower portion of the IV septum. The dominant LCA also gives rise to the AV nodal branch which supplies blood to the AV node. In about 7% of patients there is a co-dominant or balanced circulation in which case the RCA gives rise to the PDA and then terminates while the Cx artery gives rise to all the postero-lateral (PLA) branches. The Cx may also give rise to a left PDA that runs parallel to the PDA of the RCA. The sinus or sino-atrial (SA) node branch originates in the proximal portion of the RCA in 60% of cases and as a left atrial branch of the Cx in the remaining 40% of cases. This is unrelated to whether a specific artery is "dominant" or not. The video on the left (below) shows a dominant left coronary artery system. Click the buttons to toggle between the RAO and LAO projections. You can also use the buttons to see a labeled freeze frame. |
[size=+1] |
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