Defibrillation threshold decrease with the supradiaphragmatic extracardiac implantable cardioverter-defibrillator...

Area of Science:

• Pediatric Cardiology
• Electrophysiology
• Medical Device Technology

Background:

• Optimal implantable cardioverter-defibrillator (ICD) implantation techniques for pediatric patients remain under investigation.
• Totally extracardiac implantation is an emerging approach, but concerns regarding high defibrillation thresholds (DFT) persist.
• Idiopathic ventricular tachycardia poses a significant risk in pediatric populations.

Observation:

• A 3-year-old boy presented with recurrent syncopal episodes due to idiopathic ventricular tachycardia.
• The patient underwent ICD implantation utilizing the totally extracardiac technique.
• Elevated discharge impedance and DFT were noted during follow-up, posing a risk.

Findings:

• Adjusting the ICD device position from abdominal to supradiaphragmatic successfully mitigated the elevated discharge impedance.
• The repositioning of the ICD also resolved the unsafe, elevated DFT during the follow-up period.
• This intervention ensured the continued efficacy and safety of the ICD therapy.

Implications:

• Device repositioning can be an effective strategy to manage elevated DFT in pediatric patients with totally extracardiac ICDs.
• This case highlights the importance of considering device placement optimization for long-term ICD function in children.
• Further research into optimal extracardiac ICD placement techniques in pediatric populations is warranted.