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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)}

How is the long QT syndrome diagnosed?

The possibility of long Q-T syndrome should be considered in any patient with a past history of fainting associated with either emotion or exercise. A routine ECG (electrocardiogram) may show a long Q-T interval, but this is not always the case.

Further tests, including observation while the patient is exercising, may clarify the diagnosis. Genetic testing is sometimes available for individuals with a family history of long Q-T syndrome.

The diagnosis of the long QT syndrome can be made by electrocardiogram (ECG) in about 50% of cases. However, in about 10% of cases, the QT interval on the initial ECG looks normal and in another 40% the QT interval is not sufficiently prolonged to permit a clear-cut diagnosis. The long QT syndrome can also be detected after a person dies by a molecular genetic analysis of their tissue.

Early diagnosis is essential. Drugs called beta-blockers can help to maintain a normal heart rhythm in 90% of cases. In the remaining cases, a Pacemaker can be implanted to set the heart's rhythm or an automatic defibrillator can be put in that can detect and correct an abnormal heart rhythm.

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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