An angioplasty is a nonsurgical procedure that can open blocked arteries. Along with angioplasty, stents may also be inserted into the arteries to support a weakened artery. After the procedure, you must lie flat for 6-8 hours. You must take special medications if you have a stent implanted so that clots do not form. Follow the links below to find WebMD's comprehensive coverage about how angioplasty and stents are done, reasons for having the procedure, and much more.