[Redetection of tachycardia in severe ventricular undersensing]

Area of Science:

• Cardiology
• Electrophysiology
• Medical Devices

Background:

• Arrhythmogenic right ventricular cardiomyopathy (ARVC) is a genetic heart condition.
• Implantable cardioverter-defibrillators (ICDs) are used to manage life-threatening arrhythmias in ARVC patients.
• Antitachycardia pacing (ATP) is a common feature of ICDs to terminate tachyarrhythmias.

Observation:

• A 50-year-old ARVC patient with an ICD experienced two shock discharges after ineffective ATP attempts.
• Stored electrograms revealed peculiarities in the delivered shocks, including low energy.
• The analysis focused on the impact of committed versus non-committed shocks.

Findings:

• Ineffective ATP in ARVC patients can necessitate ICD shocks.
• Low-energy shocks may be a concern in ARVC patients receiving ICD therapy.
• The distinction between committed and non-committed shocks is crucial for therapeutic efficacy in ARVC.

Implications:

• This case highlights potential challenges in optimizing ICD therapy for ARVC.
• Further research is needed to refine ATP protocols and shock energy delivery in ARVC patients.
• Understanding shock commitment strategies may improve outcomes for ARVC patients with ICDs.