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long Q-T syndrome

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n.
An inherited cardiac disorder in which a defect in potassium ion channels interferes with the transmission of electrical signals to the heart muscle, producing a prolonged Q-T interval on an electrocardiogram and sometimes causing cardiac arrhythmias.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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