What is happening in the heart
Every heart cell relies on a brief, precisely timed surge of sodium rushing inward to start each heartbeat. In Brugada syndrome, the sodium channels that drive that surge don’t work quite right — most often because of a mutation in a gene called SCN5A. The result is a subtle electrical imbalance in the right ventricle, particularly in a region called the right ventricular outflow tract.
In most patients, that imbalance never causes a problem. But under the right conditions — a high fever, certain medications, very slow heart rates during sleep, sometimes a heavy meal or alcohol — the imbalance can tip into a polymorphic ventricular tachycardia or ventricular fibrillation. That’s the mechanism behind the sudden cardiac arrests we see in Brugada, classically in a previously healthy young or middle-aged adult, often at night.
The classic ECG pattern
We diagnose Brugada largely by the ECG. In the right-sided chest leads (V1 and V2), we look for one of two patterns:
- Type 1 (coved) — a tall J-point elevation followed by a downsloping ST segment and an inverted T wave. This is the only pattern that is diagnostic on its own.
- Type 2 (saddleback) — a similar elevation but with a saddle-shaped ST segment. Suggestive but not diagnostic by itself; we look at the broader picture.
The pattern can come and go. Sometimes we move the chest leads up one or two rib spaces (called “high leads”) to bring it out. In selected cases we use a provocation test with a sodium-channel blocking medication (procainamide, flecainide, or ajmaline) to unmask the pattern when the suspicion is high but the resting ECG is borderline.
Why it matters
The risk in any individual patient varies widely. Most people with a Brugada pattern on their ECG live a full life and never have an event. A smaller subset — particularly those who have already had unexplained syncope, a documented arrhythmia, or a family history of sudden death — face meaningful annual risk. Our job is to identify who falls in that high-risk group and protect them.
How we diagnose and risk-stratify
The workup includes:
- 12-lead ECG, often with high leads and repeated on different days
- Detailed personal history focused on fainting episodes, nighttime symptoms, agonal breathing, seizures, and any cardiac arrest events
- Family history — especially sudden death under age 45, unexplained drownings or accidents, and known Brugada in relatives
- Echocardiogram and sometimes cardiac MRI to confirm there is no structural disease (Brugada is purely electrical)
- Genetic testing when the diagnosis is confirmed, both to characterize the patient and to screen relatives
- Drug-provocation test in selected cases
- Electrophysiology study in borderline cases — its role is debated but it can help in some patients
We use the overall picture — symptoms, ECG, family history, sometimes genetic and EP findings — to decide who needs aggressive protection.
How we treat it
The cornerstone: avoid triggers
For every patient with a Brugada pattern, regardless of risk, we counsel on triggers:
- Treat fever aggressively. Any temperature above 38.5°C / 101°F should be treated promptly with acetaminophen (paracetamol). Severe or persistent fevers warrant evaluation.
- Avoid specific medications. A curated list of drugs that worsen Brugada is maintained at brugadadrugs.org. This includes certain antiarrhythmics, some psychiatric medications, some anesthetic agents, and several others. We share this list with every patient and ask them to review it with any new prescription.
- Limit large meals and excessive alcohol. Both have been linked to events.
- Treat cocaine use and avoid stimulants that can provoke the pattern.
ICD therapy
The only therapy that reliably aborts a Brugada-related cardiac arrest is an implantable cardioverter defibrillator. We recommend an ICD in:
- Anyone who has survived a cardiac arrest or had a sustained ventricular arrhythmia
- Patients with a spontaneous type-1 ECG pattern and unexplained syncope that is felt to be arrhythmic in origin
- Selected patients with a strong combination of risk markers
For patients who do not meet ICD criteria, we continue close follow-up with trigger avoidance and education.
The subcutaneous ICD is often an excellent choice in Brugada because most patients do not need pacing and the device avoids leads inside the heart entirely. The decision between subcutaneous and transvenous depends on individual anatomy and other considerations.
Medications
A medication called quinidine — an older antiarrhythmic — can suppress the abnormal currents in Brugada and is occasionally used in patients with frequent arrhythmic events or as an adjunct to an ICD.
Ablation
In patients with recurrent events despite an ICD, epicardial ablation of the right ventricular outflow tract is an option in experienced centers. The ablation targets the abnormal electrical region directly and can dramatically reduce shocks.
What to expect at your visit
We’ll review your ECG carefully, walk through your symptoms and family history, and decide whether further testing — high leads, drug challenge, genetic testing — is needed. We’ll give you the drug-avoidance list, talk through how to handle fevers, and discuss who else in your family should be evaluated. If your risk is elevated enough that an ICD is on the table, we’ll walk through the decision together carefully — including the device choice and what life looks like afterward.