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2-in-1 Test Signals Risk After Heart Attack
Date:12/4/2007

It measures nervous system and heart's electrical system

TUESDAY, Dec. 4 (HealthDay News) -- A test of two heart functions accurately spotted patients at highest risk of cardiac arrest or death as they recovered from a heart attack, Canadian researchers report.

"This is important because past studies, focusing on a single test, failed to identify most people at risk," said study lead author Dr. Derek V. Exner, associate professor of medicine at the University of Calgary. "We developed a simple method of identifying approximately twice as many people at risk. That means we can potentially save more lives."

The tests used in study are available now, although they aren't widely used, Exner said. "Theoretically, we can do them today if we chose to," he said. But the plan is to wait for the completion of additional trials, such as two large-scale studies now in the planning stage.

In the study, Exner and his colleagues had 322 people wear monitors for 18 to 24 hours a day, starting two to four weeks after they had suffered a heart attack. The researchers looked at the electrocardiograms recorded by the devices for an abnormality in heart rhythm called T-wave alternans, a symptom so subtle it can be detected only by computer analysis.

In addition to that measure of heart function, the electrocardiograms were also analyzed for the presence of heart rate turbulence, an abnormality of the autonomic nervous system that controls heart function.

Starting at 10 to 14 weeks after the heart attack, the presence of the two abnormalities clearly identified persons at increased risk. The 20 percent of study participants who had both abnormalities had more than six times the risk of cardiac arrest or death than other people in the study, the researchers said.

The findings are published in the Dec. 11 issue of the Journal of the American College of Cardiology.

Previous studies have shown
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