Taking antibiotics weekly for one year does not reduce the risk of a heart attack or other cardiac event for patients with stable coronary artery disease, according to a study funded by the National Heart, Lung, and Blood Institute of the National Institutes of Health. It is published in the April 21, 2005, edition of the New England Journal of Medicine.

Many previous studies have found the bacteria Chlamydia pneumoniae in the arterial plaque of patients with coronary artery disease. This led to the investigation of whether antibiotics could be used to treat the bacteria and therefore reduce the risk of cardiac events. Approximately 50 percent of U.S. adults have been exposed to C. pneumoniae at some point in their lives. It spreads through the air and can cause pneumonia.

"This study found no benefit from treating the C. pneumoniae bacteria with antibiotic in order to reduce the risk of heart attack or improve overall cardiac outcomes," said NHLBI Director Elizabeth G. Nabel, M.D. "We must continue to focus on the controllable risk factors for preventing coronary events."

ACES researchers randomly assigned 4,012 men and women to receive either once-weekly doses of azithromycin or placebo for one year. After an average follow-up of 3.9 years, there was no significant reduction of cardiac events, defined as death, heart attack, unstable angina, angioplasty or cardiac surgery, among participants receiving antibiotic compared to those given placebo. This lack of effect of antibiotic was shown for all participants regardless of age, gender, smoking status, or presence of C. pneumoniae antibody. The antibiotic treatment also had no affect on total mortality or on incidence of stroke.

Men and women were included in the study if they had stable coronary artery disease following a previous cardiac event such as a heart attack, angioplasty, or cardiac bypass surgery. Azithromycin was selected because of its proven effectivenes
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Contact: NHLBI Communications Office
nhlbi_news@nhlbi.nih.gov
301-496-4236
NIH/National Heart, Lung, and Blood Institute
20-Apr-2005

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