If a blockage is identified by cardiac catheterization, the doctor may open the blocked artery or vein with angioplasty or a stent. During angioplasty, a small balloon-tipped catheter is guided into the blocked blood vessel. The balloon is inflated to open the vessel. Once the blood vessel is opened, the balloon is deflated and removed. A stent may also be inserted through the catheter. A stent is a tiny expandable coil that is placed in a blocked blood vessel to prevent it from becoming blocked again. The stent holds open the blood vessel to improve circulation and allow greater blood flow. https://www.youtube.com/watch?v=SrUlaztdQCM&index=3&list=PLFCC5143DFE5D9F66