Coronary “Collateralization” or “De-collateralization” by Percutaneous Coronary Intervention in the Collateral Flow Supplying or Receiving Vessel
Images of coronary angiography are being presented of two patients undergoing percutaneous coronary intervention (PCI). In the first patient with chronic total vessel occlusion, who also had a significant stenosis of the contralateral artery, there were no visible collaterals, which became fully functional and visible right after the successful PCI of the contralateral lesion (collateralization by PCI). In the second patient with acute myocardial infarction undergoing primary PCI of a total vessel occlusion, there was good collateral supply (provided by the contralateral vessel), which vanished upon restoration of anterograde flow to the totally occluded artery (de-collateralization by PCI).
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