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All about long QT syndrome causes of Long QT syndrome symptoms of long QT syndrome diagnosis of long QT syndrome treatment for long QT syndrome arrhythmias (abnormal heart rhythms) {bundle branch block cardiac arrhythmia atrial fibrillation atrial flutter supraventricular tachycardia sick sinus syndrome ventricular arrhythmias ventricular tachycardia ventricular fibrillation heart block Brugada syndrome long QT syndrome short QT syndrome Wolff-Parkinson-White syndrome (WPW syndrome)}

What're the symptoms of the long QT syndrome?

The main symptoms of Long QT syndrome are fainting or loss of consciousness. This happens when the rapidly beating heart is unable to supply the brain with sufficient blood and oxygen. This abnormal rhythm may occur during intense emotional excitement, during physical exertion, or less commonly when the sufferer is at rest. When unconscious it is not

possible to feel the patient’s pulse. Consciousness is usually regained within one or two minutes as the heart rhythm becomes normal again. People with this syndrome may show prolongation of the QT interval during physical exercise, intense emotion (such as fright, anger or pain), or by a startling noise.

In one type of inherited long QT syndrome, the person is also deaf. Studies of otherwise-healthy people with LQTS indicate that they had at least one episode of blacking out (fainting) by the age of 10. The majority also had a family member(s) with a long QT interval. It should be emphasized that people with LQTS don't necessarily have a prolonged QT interval all the time. Thus, when they have an ECG (as during a routine physical examination), the QT interval may be normal.

Some healthy young people may not have a routine ECG, and LQTS may be suspected because of their family history or because of unexplained fainting episodes. In any family where repeated episodes of fainting or a history of sudden death exist, the cause(s), including long QT syndrome, should be investigated.

More information on long QT syndrome

What is long QT syndrome? - Long QT syndrome is a heart condition in which there is an abnormally long delay between the electrical excitation and relaxation of the ventricles of the heart.
What causes Long QT syndrome? - The cause of the long QT syndrome is a mutation in a gene that regulates the heart's electrical system. rrhythmias in individuals with LQTS are often associated with exercise or excitement.
What're the symptoms of the long QT syndrome? - The main symptoms of Long QT syndrome are fainting or loss of consciousness. Torsade de pointes can also lead to ventricular fibrillation.
How is the long QT syndrome diagnosed? - The diagnosis of the long QT syndrome can be made by electrocardiogram (ECG) in about 50% of cases. Early diagnosis is essential.
What's the treatments for long QT syndrome? - There are two treatment options in individuals with LQTS: arrhythmia prevention, and arrhythmia termination.
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All information is intended for reference only. Please consult your physician for accurate medical advices and treatment. Copyright 2005,, all rights reserved. Last update: July 18, 2005