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A Initial coronary angiography during ST elevation. On the left, the first mid of the right coronary artery is patent and then is totally occluded on antegrade perfusion. B A thin catheter is forwarded to the posterior descending artery. The right internal mammary is still patent (presence of contrast) with perfusion of the posterior descending artery but the flow is obstructed proximally to anastomosis (green arrow)
