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Still puzzling: Best care for the frail and elderly with coronary artery disease

July 21, 2008

DURHAM, N.C. - A new study from Duke University Medical Center finds that patients treated solely with medications after suffering from chest pain, heart attack or coronary artery disease are more likely to die during the first year following their initial hospitalization.

"Patients managed medically without stenting or bypass surgery tend to be elderly and frail, and in some sense we feel they have been overlooked," says Matthew Roe, a cardiologist at Duke and the senior author of the study appearing in the August issue of the Journal of the American College of Cardiology: Cardiovascular Intervention. "We wanted to find out what clinical factors were funneling them into a medicine-only group and what happened to them, when compared to patients who received stents and bypass procedures."

Roe led a team of researchers in examining a subset of 8,225 patients from a previous study (the SYNERGY trial) which compared the effects of two different anti-clotting drugs in heart patients. For the current study, researchers included only patients who had undergone cardiac catheterization and who had been found to have at least one significant blockage in a coronary artery. A majority of these patients (52 percent) underwent coronary stent implantation to open their arteries, while 32 percent were medically managed, and 16 percent underwent coronary bypass surgery.

Investigators discovered that patients in the medical management group were more likely to be elderly women with low body weight, and more likely to have had peripheral artery disease, high blood pressure, diabetes or a history of stroke or a previous bypass surgery.

Researchers found that with all else being equal, the risk of death was highest for the medically managed group and lowest for patients who underwent stenting. Death rates among medically managed patients increased rapidly during the first three months following release from the hospital, and stayed higher than those in the other two groups. At one year, the mortality rate among the medically managed group was 7.7 percent, 3.6 percent for patients who underwent stenting, and 6.2 percent among those who underwent bypass procedures.

"It is important to know that the patients in the medically managed group had a higher death rate despite receiving most of the currently recommended medications for this condition from clinical practice guidelines," says Roe. "There are often very good reasons why stenting or bypass are not viable options for some patients. What this study tells us is that for these patients who are medically managed, we need to come up with better treatment approaches that lessen their risk of death."

Roe says possible solutions may arise from a new trial that is just getting under way. The new study, called TRILOGY will compare clopidogrel (Plavix) with the experimental drug prasugrel, another anti-clotting agent, among elderly and frail medically-managed patients with chest pain and coronary artery disease. An earlier trial found that prasugrel was effective in reducing the risk of clotting, but it also brought about a higher risk of bleeding. The TRILOGY trial will compare the two drugs again, but will study a lower dose of prasugrel than in the earlier study. The Duke Clinical Research Institute will manage TRILOGY, which is expected to enroll approximately 10,000 patients in hundreds of hospitals world-wide.

Duke University Medical Center