[Asymptomatic channelopathies : Risk stratification and primary prophylaxis].

Area of Science:

• Cardiology
• Genetics
• Electrophysiology

Context:

• Inherited cardiac channelopathies, including long-QT syndrome (LQTS), Brugada syndrome (BrS), catecholaminergic polymorphic ventricular tachycardia (CPVT), and short-QT syndrome (SQTS), predispose individuals to sudden cardiac death (SCD).
• Asymptomatic patients with these conditions are at increased risk, necessitating proactive management strategies.

Purpose:

• To outline the diagnostic approaches and risk stratification methods for inherited cardiac channelopathies.
• To discuss current therapeutic strategies for reducing sudden cardiac death (SCD) risk in affected individuals.

Summary:

• Pathogenic variants in ion channel genes lead to abnormal ion currents, increasing SCD risk in channelopathy patients.
• Diagnosis relies on clinical presentation, electrocardiography, and genetic testing for known mutations.
• Risk score calculators for LQTS and BrS aid in SCD risk estimation, though their impact on implantable cardioverter-defibrillator (ICD) selection is under investigation.
• Management includes trigger avoidance, beta-blockers, mexiletine for LQTS3, and specialized outpatient clinic referrals for personalized risk assessment.

Impact:

• Improved understanding of channelopathy diagnosis and risk stratification can lead to earlier intervention and better patient outcomes.
• Identifying at-risk individuals and implementing prophylactic measures can significantly reduce the incidence of sudden cardiac death (SCD).
• Referral to specialized clinics ensures comprehensive care and tailored management plans for patients and their families.