The right coronary artery are RCA supplies the right ventricle through a marginal branch which arises near the origin of the vessel.

右冠状动脉（RCA）通过边缘分支供血右心室，该分支在血管起点附近。

Blockage of the RCA distal to the origin of the marginal branch, in facts, the inferior surface of the heart, this inferior surface is examined by leads II III and aVF.

RCA远端至边缘分支起源处阻塞，即心脏下表面，下表面由II-III和aVF导联检测。