Long QT Syndrome other diagnostic studies
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Overview
The diagnosis of long QT syndrome can be difficult when abnormalities on electrocardiogram are borderline or intermittent. In cases where the history and symptoms are suggestive of long QT syndrome, but few or no abnormalities are seen on electrocardiogram, further testing can be done to unmask long QT syndrome with the use of exercise treadmill testing, and catecholamine provocation testing.
Non-exercise Catecholamine Stress Testing
During this type of test, an EKG is performed while the patient is given an infusion of epinephrine. This test can unmask what is known as concealed long QT syndrome, which shows a normal QT interval on EKG at rest. This test will usually show a prolonged QT interval in persons who have a history of fainting spells in response to intense exercise or emotional upset.
Exercise Treadmill Testing
Similar to catecholamine provocation testing, an exercise treadmill test with EKG, can unmmask concealed long QT syndrome. This is also used as a provocation test for persons who have history and symptoms, or a family history suggestive of long QT syndrome, but do not have any abnormalities on resting EKG.