The diagnosis of<unk>  QT syndrome can be difficult when abnormalities on electrocardiogram are borderline or intermittent. In cases where the history and symptoms are suggestive of<unk>  QT syndrome, but few or no abnormalities are seen on electrocardiogram, further testing can be done to unmask<unk>  QT syndrome with the use of exercise treadmill testing, and catecholamine provocation testing.
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