The Heart has the ability to create Collateral Circulation, or new vessels that help to nourish the myocardium of the heart when a blockage, and/or a heart attack creates inadequate blood flow. It takes time for this Collateral Circulation to form, and it may or may not fully meet the needs of the myocardium for oxygen. This Collateral Circulation can usually be seen in the film taken of the Coronary Arteries during Coronary Angiography.
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