Management of Long QT Syndrome and Brugada Syndrome

Long QT Syndrome Management

• The American College of Cardiology recommends lifestyle modifications, including avoidance of QT-prolonging medications, competitive sports, and specific triggers based on genotype, for all LQTS patients (Class I recommendation) 1, 2, 3
• Beta-blockers are recommended as first-line therapy for all patients with clinical LQTS diagnosis (prolonged QT interval on ECG) with Class I indication 1, 2, 3
• Cardiac arrest survivors must receive an ICD plus continued beta-blocker therapy (Class I recommendation) 1, 2, 3
• Patients experiencing syncope or ventricular tachycardia despite beta-blocker therapy should receive an ICD with continued beta-blockers (Class IIa recommendation) 1, 2
• Left cardiac sympathetic denervation may be considered for patients with syncope, torsades de pointes, or cardiac arrest while on beta-blockers (Class IIb recommendation) 1, 2

Brugada Syndrome Management

• No effective pharmacological treatment exists for Brugada syndrome, making risk stratification critical for ICD decisions 1, 2, 3, 6
• The European Heart Journal recommends avoidance of drugs that induce ST-segment elevation, including certain psychotropic medications, anesthetic agents, and cocaine 7, 8, 9
• Aggressive and prompt treatment of fever with antipyretics is essential, as fever can acutely precipitate cardiac arrest and triggers 27% of life-threatening arrhythmic events in young patients 7, 8, 9
• Cardiac arrest survivors must receive an ICD 1, 2, 7, 3, 6
• Patients with documented spontaneous sustained ventricular tachycardia require ICD implantation 7, 6
• Quinidine should be considered for patients with contraindications to ICD, those who refuse ICD, patients experiencing recurrent ICD shocks (electrical storms), and those requiring treatment for supraventricular arrhythmias (Class IIa recommendation) 7, 8, 9, 6
• Catheter ablation may be considered for patients with electrical storms or repeated appropriate ICD shocks (Class IIb recommendation) 7, 6
• Isoproterenol should be considered for acute treatment of electrical storms 7

Risk Stratification and Activity Restrictions

• Annual arrhythmic event rates: 13.5% in cardiac arrest survivors, 3.2% in syncope patients, 1% in asymptomatic patients 6
• In young patients, spontaneous Brugada type 1 ECG pattern and symptoms at diagnosis are the strongest predictors of life-threatening arrhythmias 7
• Most high-intensity activities are probably permitted (rated 2-4/5), as arrhythmias typically occur at rest or during sleep due to increased vagal activity 4, 5, 10
• Activities with risk of traumatic injury during potential loss of consciousness (free weights, downhill skiing, motorcycling, horseback riding) should be approached cautiously (rated 1-2/5) 4, 5
• Water sports including scuba diving (rated 0/5) and swimming require careful consideration due to drowning risk if syncope occurs 4, 5