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Long QT syndrome: An inherited defect in heart rhythm that predisposes to syncope without warning (sudden fainting spells), dizziness, palpitations, seizures and sudden death. The name of the syndrome comes from the QT segment in the tracing on the ele...
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Long arm of a chromosome: The long arm of a chromosome is termed the q arm. All human chromosomes have 2 arms, the p (short) arm and the q (long) arm. They are separated from each other only by a primary constriction, the centromere, the poi...
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QT syndrome, long: An inherited defect in the heart rhythm. In the US alone, it is estimated that 4,000 children and young adults die yearly of the long QT syndrome. It is a common cause of sudden death among school athletes, as well as the cause of ma...
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