Long QT syndrome

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Definition Symptoms Causes Risk factors When to seek medical advice Tests and diagnosis

Complications Treatments and drugs Prevention Lifestyle and home remedies Coping and support

Definition

Long QT syndrome (LQTS) is a heart rhythm disorder that can potentially cause fast, chaotic heartbeats. The rapid heartbeats, caused by changes in the part of your heart that causes it to beat, may lead to fainting. In some cases, your heart's rhythm may beat so erratically that it can cause sudden death.

You can be born with a genetic mutation that puts you at risk of long QT syndrome. In addition, more than 50 medications, many of them common, may cause long QT syndrome. Medical conditions, such as congenital heart defects, also may cause long QT syndrome.

Long QT syndrome is treatable. You may need to limit your physical activity, avoid certain medications that can cause the condition or take medications to prevent a chaotic heart rhythm (arrhythmia). Some people with long QT syndrome also need an implantable device to control the heart's rhythm and to prevent against sudden death.

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Symptoms