The success rate of coronary angioplasty is about 95 percent. However, in about five percent of cases, the procedure may be unsuccessful. Urgent bypass surgery may be required in about one percent of patients, states National University Heart Center Singapore.
The National Heart, Lung and Blood institute says, a fatty substance called plaque can build up in your arteries causing them to narrow and harden. Coronary angioplasty is a procedure used to open blocked or narrowed heart arteries. Blood flow to the heart improves when the narrowed arteries are unclogged. Angioplasty is done on more than one million people a year in the United States, and it has few serious complications, according to The National Heart, Lung and Blood Institute.