Heart experts at Johns Hopkins have evidence that life-saving coronary angioplasty at community hospitals is safer when physicians and hospital staff have more experience with the procedure.
In a report to be presented Nov. 12 at the American Heart Association's annual Scientific Sessions in New Orleans, researchers found that among 5,737 men and women who had emergency, so-called primary angioplasty for treatment of sudden heart attack, all at community hospitals with no on-site cardiac surgery backup, hospitals performing 83 or more procedures per year had the lowest death rates at the time of hospital discharge, at 2.2 percent.
Angioplasty consists of threading a thin tube into the main blood vessels near the heart, and using it to inflate a tiny balloon to widen an artery blocked or narrowed from the buildup of cholesterol-laden plaque. A metal cylinder stent is often deployed to keep the blood vessel open.
Researchers say their findings, collected over seven years from a diverse group of 31 hospitals across the country, none of which have elective angioplasty programs, suggest that patient safety and survival rates for primary angioplasty could be improved by easing restrictions on the use of elective angioplasty so that such hospitals can get more experience.
Under present guidelines from the American Heart Association and the American College of Cardiology, community hospitals are limited to offering angioplasty only in emergency situations, such as during a heart attack. In all other nonemergency or elective surgical cases, patients must be transferred to another hospital that has on-site, specialized heart surgery backup.
"The results reinforce what we have known for a long time with many other technical procedures, such as organ transplantation or specialized heart surgery: From an institutional and physician perspective, the more procedures performed, the better the outcomes for the patient," says senior study investigator and interventional cardiologist Thomas Aversano, M.D.
According to the American Heart Association, in 2005 an estimated 1,265,000 angioplasty procedures were performed on 640,000 Americans. This amounts to a 324 percent increase in volume since 1987.
In this study, one of a number being conducted by the Cardiovascular Patient Outcomes Research Team (or C-PORT), all participants had primary angioplasty in response to a heart attack caused by a blocked artery. Mortality rates were adjusted to account for factors that heighten risk, such as age, ability to tolerate clot-busting drugs, diabetes and the extent of blockages in coronary blood vessels.