Healthdirect Free Australian health advice you can count on.

Medical problem? Call 1800 022 222. If you need urgent medical help, call triple zero immediately

healthdirect Australia is a free service where you can talk to a nurse or doctor who can help you know what to do.

beginning of content

Long QT syndrome

1-minute read

Long QT syndrome (LQTS) is a disorder of the heart's electrical system that can cause fast, chaotic heartbeats, called arrhythmias. It is named after the distinctive pattern seen on an electrocardiogram (ECG or heart tracing).

If you have long QT syndrome, you may have been born with a gene that puts you at risk. It might also be caused by certain medications. 

People with long QT syndrome may experience fast or irregular heartbeats, fainting or seizures. If the heart is beating erratically for a long period it can cause cardiac arrest in some people, and possibly sudden death. 

Treatment for long QT syndrome often involves limiting physical activity, avoiding certain medications or taking medications to help prevent the development of fast or irregular heartbeats. Some people with long QT syndrome may also need surgery and an implantable device to control the rhythm of the heart. 

Follow the links below to find trusted information about long QT syndrome.

Last reviewed: May 2018

Need more information?

These trusted information partners have more on this topic.

Top results

Long QT syndrome - myDr.com.au

Find out about Long QT syndrome, and how an electrical problem in the heart can cause a very fast heart beat and sudden death.

Read more on myDr website

Long QT syndrome | Sydney Children's Hospitals Network

What is Long QT Syndrome? Long QT syndrome (LQTS) is a heart rhythm disorder, which can cause periods of abnormally fast heart rhythm called arrhythmias

Read more on Sydney Children's Hospitals Network website

Long QT syndrome - Better Health Channel

You should be investigated for long QT syndrome if you faint for no apparent reason, during or after exercise or emotional excitement.

Read more on Better Health Channel website

Arrhythmias (abnormal heart rhythms)

Arrhythmia is when you have an abnormal heart rhythm and heart palpitations are an awareness of your heartbeat.

Read more on WA Health website

What are arrhythmias? | The Heart Foundation

An arrhythmia is an abnormal heart rhythm. Find out about arrhythmia causes, diagnosis and treatment.

Read more on Heart Foundation website

Heart arrhythmias and palpitations - Better Health Channel

A heart that beats irregularly, too fast or too slow, is experiencing an arrhythmia.

Read more on Better Health Channel website

Heart arrhythmia (atrial fibrillation; atrial flutter) | myVMC

Arrhythmia or irregular heart beat includes tachyarrhythmia, where the heart beats faster, and bradyarrhythmias, where the heart beats slower than normal.

Read more on myVMC – Virtual Medical Centre website

What is atrial fibrillation - arrhythmia? | The Heart Foundation

Atrial fibrillation is an irregular heartbeat (arrhythmia) that can lead to heart failure and other heart-related complications. Learn the causes, symptoms, and treatments.

Read more on Heart Foundation website

Fontan circulation and arrhythmia | Sydney Children's Hospitals Network

This information is designed for use by young people with a Fontan circulation and their families

Read more on Sydney Children's Hospitals Network website

The inherited arrythmia clinic | Sydney Children's Hospitals Network

The Inherited Arrhythmia Clinic (IAC) at the Heart Centre for Children, The Childrens Hospital at Westmead, is a multi-disciplinary clinic that provides a range of services for families with children with arrhythmia conditions

Read more on Sydney Children's Hospitals Network website

Healthdirect 24hr 7 days a week hotline

24 hour health advice and information you can count on

1800 022 222

Government Accredited with over 140 information partners

We are a government-funded service, providing quality, approved health information

Australian Government, health department logo ACT Government logo New South Wales government, health department logo Northen Territory Government logo Government of South Australia, health department logo Tasmanian government logo Government of Western Australia, health department logo