What is Brugada Syndrome?
Brugada syndrome is an inherited cardiac channelopathy characterized by a distinctive coved ST-segment elevation in right precordial leads (V1-V2) and an increased risk of sudden cardiac death from ventricular fibrillation, predominantly affecting young males. 1
Diagnostic Criteria
The diagnosis requires a Type 1 Brugada ECG pattern showing:
- Coved ST elevation ≥2mm in leads V1 or V2
- Positioned in the 2nd, 3rd, or 4th intercostal space
- Either spontaneous OR induced by sodium channel blocker challenge
- Negative T waves in right precordial leads
- Absence of other causes of ST elevation 1
Key diagnostic tip: Use high electrode positioning (2nd and 3rd intercostal spaces) to improve detection of Type 1 pattern 1. Only Type 1 pattern is diagnostic; Type 2 and 3 patterns require sodium channel blocker challenge for confirmation 2.
Management Algorithm
Step 1: Risk Stratification
HIGH RISK = ICD Indicated
Implant an ICD if the patient has: 1
- Prior cardiac arrest from ventricular fibrillation
- Documented sustained ventricular arrhythmias
- Syncope attributed to arrhythmia with spontaneous Type 1 ECG
These patients have the highest mortality risk and ICD implantation has proven mortality reduction 1.
LOW RISK = Observation
Asymptomatic patients with Type 1 pattern (even spontaneous) have low event rates (<1%/year) and do not require ICD 2. Electrophysiology study for risk stratification in asymptomatic patients remains controversial and is not clearly established 2.
Critical distinction: Spontaneous Type 1 pattern with syncope = high risk. Spontaneous Type 1 pattern without symptoms = low risk despite the spontaneous pattern 3.
Step 2: Trigger Avoidance (ALL Patients)
Mandatory interventions to prevent arrhythmias: 1
Avoid specific medications - Check www.brugadadrugs.org for comprehensive list including:
- Psychotropic medications
- Anesthetic agents with sodium channel blocking properties
- Cocaine
Aggressive fever management - Fever is a major trigger:
- Early antipyretics at first sign of fever
- Consider in-hospital monitoring during febrile illness if Type 1 pattern exists 4
Limit excessive alcohol intake 1
Step 3: Consider Alternative Therapies
Catheter Ablation
For patients with recurrent ICD shocks or ICD refusal:
- Epicardial ablation of abnormal late activation areas in right ventricular outflow tract
- Eliminates spontaneous Type 1 pattern in >75% of patients
- Markedly reduces VT/VF recurrence 1
- Limitation: Limited long-term follow-up data; ICD still recommended for those with prior syncope/cardiac arrest 1, 5
Quinidine
Alternative to ICD in selected patients who refuse device:
- No deaths reported during mean 9-year follow-up in one series
- Caveat: 38% experience adverse effects requiring dose adjustment or discontinuation 1
- Not first-line due to side effect profile
Step 4: Genetic Testing and Family Screening
Genetic testing is reasonable but not required for diagnosis: 1
- Only 20-30% yield in phenotype-positive patients
- SCN5A accounts for most identified mutations
- Negative genetic test does NOT exclude Brugada syndrome 2
- Genotype status does NOT correlate with risk of adverse events 1
Primary value: Facilitates cascade screening of family members and lifestyle modification counseling 1
Limit testing to SCN5A gene only - other genes account for <3% of cases 2
Common Pitfalls to Avoid
Do NOT misinterpret Type 1 pattern as incomplete RBBB - This diagnostic error can be fatal 6
Do NOT perform sodium channel blocker challenge in children before puberty (except specific circumstances) 4
Do NOT use EP study results alone to guide ICD decisions in asymptomatic patients - Evidence for this approach is not established 2
Do NOT reassure patients based on negative genetic testing when Type 1 ECG exists 2
Asymptomatic patients with drug-induced (not spontaneous) Type 1 pattern and positive family history do NOT require chronic therapy due to low risk 1
Special Populations
Children: