Long-term Monitoring to Detect Risk of Sudden Cardiac Death in Inherited Arrhythmia Patients.

Area of Science:

• Cardiology
• Electrophysiology
• Genetics

Background:

• Risk stratification for inherited arrhythmia syndromes remains a clinical challenge.
• Implantable cardioverter-defibrillators (ICDs) prevent sudden cardiac death but carry risks.
• Long-term implantable loop recorder (ILR) monitoring is explored for risk factor identification in these patients.

Purpose of the Study:

• To evaluate the utility of long-term ILR monitoring in inherited arrhythmia patients.
• To identify risk factors for arrhythmias requiring intervention.
• To assess the role of ILR in guiding ICD implantation decisions.

Main Methods:

• Prospective multicentre study (2015-2020) of inherited arrhythmia probands and family members.
• Patients had intermediate arrhythmic risk without clear ICD indications.
• Primary endpoint: ILR detection of nonsustained ventricular tachycardia (≥10 beats); secondary: ICD insertion, mortality, ILR complications.

Main Results:

• 45 individuals enrolled; common diagnoses: Long-QT syndrome (28%), Brugada syndrome (26%), arrhythmogenic cardiomyopathy (11%).
• Mean follow-up 633 days; 42% experienced symptoms, 11% had nonsustained ventricular tachycardia, 11% received ICDs based on ILR findings.
• Symptomatic events were more frequent in arrhythmogenic cardiomyopathy patients; no sudden cardiac deaths occurred.

Conclusions:

• Implantable loop recorders effectively detect high-risk arrhythmic features.
• ILR monitoring aids in selecting appropriate candidates for ICD implantation.
• ILRs are valuable for managing inherited arrhythmia patients with borderline indications for ICDs.