Anatomy - Proximal RCA occlusion

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In 85% of cases, the right coronary artery (RCA) supplies blood to the inferoposterior myocardium through the Ramus Descendens Posterior (RDP). Occlusion of the RCA, therefore, could lead to an inferoposterior myocardial infarction. In an inferoposterior myocardial infarction the ischemia vector in the frontal plane points to the direction of the positive pole of lead III. Thus, the degree of ST elevation in this case is greatest in lead III. Since this ischemia vector also points to the direction of the negative pole of lead I, ST depression may be seen in lead I.

 

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