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Rhythm abnormality of unknown origin strongly predicts sudden death risk in heart disease patients
Date:2/2/2009

LOS ANGELES (Feb. 2, 2009) Researchers conducting a large, ongoing study to improve detection and prevention of sudden cardiac death were surprised to discover that a specific heart rhythm abnormality idiopathic QT interval prolongation increased risk five-fold among patients with coronary artery disease.

"More than 80 percent of all cases of sudden cardiac death occur in people who have significant coronary artery disease, but we currently do not have a medical test that consistently identifies patients at risk," said Sumeet S. Chugh, M.D., associate director of the Cedars-Sinai Heart Institute and director of Clinical Electrophysiology. Chugh is first author of an article in Circulation, now appearing online ahead of print. This research was conducted with colleagues in the Emergency Medicine and Pathology Departments at Oregon Health and Science University in Portland, as part of the ongoing Oregon Sudden Unexpected Death Study.

"Abnormal QT prolongation has significant potential for evaluating risk and developing prevention strategies, but there are many factors some known and some not known that contribute to QT prolongation. Diabetes and the use of certain medications were significant predictors of QT interval prolongation and sudden cardiac death risk in our study. However, the most interesting and somewhat unexpected finding was that abnormally prolonged QT interval of unknown etiology independent of diabetes, medications and other factors was an even more powerful predictor of sudden cardiac death, with a five-fold increase in odds," said Chugh, who holds the Pauline and Harold Price Chair in Cardiac Electrophysiology Research.

The researchers noted that several gene variations have been linked to prolonged QT intervals, and the discovery of new genetic associations are likely to improve risk-assessment and intervention strategies. "The continued identification of gene variants that determine QT interval durati
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Contact: Sandy Van
sandy@prpacific.com
808-526-170-880-088-02397
Cedars-Sinai Medical Center
Source:Eurekalert

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