Brugada syndrome is an inherited condition of the heart’s electrical system that can, uncommonly, trigger a dangerous fast heart rhythm, causing fainting or sudden cardiac arrest — often during sleep or rest. It is recognised on a characteristic ECG pattern and is notably more common in South-East and East Asian men, which makes it relevant in Singapore. Many people never have symptoms; care focuses on avoiding triggers, treating fever promptly, and, for higher-risk people, an implantable defibrillator.
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In a medical emergency, or for severe or sudden symptoms such as breathing difficulty, chest pain, fainting or stroke signs, call 995 immediately.
Most people with Brugada syndrome feel completely well and may only learn they have it through an ECG done for another reason or through family screening. But because the condition can rarely cause a life-threatening rhythm disturbance, understanding your triggers and warning signs matters. This guide explains what Brugada syndrome is, how it is diagnosed and managed in Singapore, and when to seek urgent help. It is general information and not a substitute for assessment by a cardiologist.
What Brugada syndrome is
Brugada syndrome is an inherited disorder affecting the electrical signalling that keeps the heart beating in a steady rhythm. In affected people, faulty signalling in the heart’s lower chambers can, uncommonly, set off a very fast and disorganised rhythm. When this happens, the heart can no longer pump blood effectively, which may cause sudden fainting or, in the worst case, a cardiac arrest. A striking feature is that these events often occur at rest or during sleep rather than during exercise.
The condition is identified by a characteristic pattern on an ECG (a tracing of the heart’s electrical activity). It is notably more common in people of South-East and East Asian descent, and much more common in men than in women. In parts of the region, sudden unexplained death during sleep among otherwise healthy young men has long been described, and Brugada syndrome is thought to explain a share of these cases — which is why it is a recognised concern in Singapore.
Symptoms
Many people have no symptoms at all and are diagnosed only after an incidental ECG or family screening. When warning signs do occur, they may include:
- Fainting or blackouts, particularly at night or during rest.
- Gasping, laboured or abnormal breathing during sleep.
- Palpitations — a sensation of a racing, pounding or irregular heartbeat.
- A cardiac arrest, sometimes as the first sign of the condition.
- A family history of unexplained sudden death at a young age.
Fever is an important trigger: a high temperature can bring out the ECG pattern and increase the risk of a dangerous rhythm, so any fever should be treated without delay.
Causes and who is at risk
Brugada syndrome is usually inherited, meaning it can run in families and be passed from parent to child. It is often linked to changes in the genes that control the heart’s sodium channels — tiny gateways that let the electrical current flow through heart-muscle cells. When these channels do not work normally, the heart becomes vulnerable to rhythm disturbances.
Risk is higher in men and in people of Asian descent. Several factors can unmask or provoke the condition even in someone who is usually well, including fever, excess alcohol, and certain medicines — among them some drugs used for heart-rhythm problems, some psychiatric and pain medicines, and others. Because the list is specific and updated over time, always check with your doctor or pharmacist before starting anything new.
How it is diagnosed
Diagnosis usually begins with an ECG. In some people the characteristic pattern is present all the time; in others it comes and goes. When Brugada syndrome is suspected but the ECG is not clearly diagnostic, a specialist may perform a drug-challenge test — giving a medicine under close supervision in hospital to see whether it brings out the pattern. This is done only by a cardiologist or heart-rhythm specialist (electrophysiologist) with monitoring in place.
Assessment also includes a careful personal and family history, looking for fainting or unexplained young sudden deaths in relatives. Genetic testing may be offered to confirm an inherited cause and to guide screening of family members. Because the condition is inherited, first-degree relatives — parents, brothers and sisters, and children — are often advised to be screened. In Singapore this care is available through cardiology and inherited-heart-condition services such as those at the National Heart Centre Singapore.
Treatment
There is no cure, but the risk of a dangerous event can be reduced. For most people, care centres on avoiding triggers: treating fever promptly with fever medicine, steering clear of medicines that can provoke the condition, and limiting alcohol. Keeping a written list of medicines to avoid — and sharing it at every medical and dental visit — is a simple but important safeguard.
For people at higher risk — such as those who have fainted from a heart-rhythm cause or survived a cardiac arrest — a specialist may recommend an implantable cardioverter defibrillator (ICD). This small device is placed under the skin and continuously watches the heart rhythm; if it detects a dangerous rhythm, it delivers a corrective shock to restore a normal beat. In selected cases other treatments may be considered. Many people who are at lower risk and have never had symptoms are simply monitored over time. Your specialist will weigh your personal risk before recommending any treatment.
Living with Brugada syndrome and self-care
Practical steps make a real difference:
- Keep an up-to-date list of medicines to avoid, and show it to every doctor, dentist and pharmacist.
- Treat fever promptly with fever medicine, and seek advice if a fever is high or persistent.
- Limit alcohol, and avoid binge drinking.
- Encourage first-degree relatives to be screened.
- Make sure household members know how to perform CPR and use an AED, since a fast response saves lives.
- Attend follow-up appointments with your cardiologist or electrophysiologist as advised.
Many people with Brugada syndrome lead full, active lives. Your specialist can advise on any individual precautions for you.
When to seek emergency help
Call 995 and start CPR at once if someone collapses and is not breathing normally or is only gasping; use an AED if one is available. Seek prompt (non-emergency) medical assessment if you faint or black out without explanation — especially at rest or during sleep — if you have unexplained palpitations, or if a close relative died suddenly and unexpectedly at a young age. Always treat fever quickly and check any new medicine against your avoid list.
Common questions
Is Brugada syndrome inherited?
Yes. It usually runs in families and is often linked to changes in the genes controlling the heart’s sodium channels, so relatives may be advised to have screening.
Why does it seem more common in Singapore and across Asia?
Brugada syndrome is more common in people of South-East and East Asian descent and in men. Sudden unexplained death during sleep in young men has long been described in the region, and this condition is thought to account for a share of such cases.
Why do doctors worry so much about fever?
A high temperature can bring out the characteristic ECG pattern and raise the risk of a dangerous rhythm, so fever should be treated promptly with fever medicine.
Can I exercise and live normally?
Many people do. Because events often happen at rest rather than during exertion, your specialist will give advice tailored to your risk, including any activities or precautions to consider.
Does everyone with Brugada syndrome need a defibrillator?
No. An ICD is generally recommended for higher-risk people, such as those who have fainted from a rhythm cause or survived a cardiac arrest. Many lower-risk people are simply monitored and advised on avoiding triggers.
Related guides
Sources
- National Heart Centre Singapore
- Singapore Heart Foundation
- HealthHub
- Heart Rhythm Society