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Definition of QT syndrome, long

QT syndrome, long: A disorder of the heart's electrical system that predisposes individuals to irregular heartbeats, fainting spells, and sudden death. The irregular heartbeats are typically brought on by stress or vigorous activity. Abbreviated LQTS. LQTS is often symptoml

Source: MedTerms™ Medical Dictionary
Last Editorial Review: 3/30/2012

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