[The implantable cardiac defibrillator: indications and complications]

Area of Science:

• Cardiology
• Medical Devices

Background:

• Sudden cardiac death (SCD) is a critical concern in patients with ventricular arrhythmias.
• Implantable cardiac defibrillators (ICDs) are established for secondary prevention and primary prevention in specific patient groups.
• Current guidelines lack differentiation for specific demographics like women and the elderly.

Purpose of the Study:

• To review the current indications for ICD implantation.
• To highlight the lack of evidence for ICD efficacy in women and elderly patients (over 70-75 years).
• To discuss the implications for cost-effectiveness and future research directions, particularly in patients with LVEF ≥ 35%.

Main Methods:

• Literature review of current guidelines and evidence regarding ICD implantation.
• Analysis of patient demographics and outcomes in relation to ICD therapy.
• Discussion of potential complications and technological advancements like home-monitoring.

Main Results:

• ICDs are indicated for secondary prevention post-ventricular arrhythmia and primary prevention with LVEF ≤ 35%.
• Biventricular ICDs are recommended for heart failure patients (NYHA class ≥ II) with LVEF ≤ 35% and wide QRS.
• Evidence for reduced mortality in women and patients >70-75 years is lacking, despite guidelines not differentiating.
• The effect of ICDs in primary prevention for patients with LVEF ≥ 35% remains uninvestigated.

Conclusions:

• Current ICD guidelines may not fully reflect evidence in all patient subgroups, particularly women and the elderly.
• Further research is needed to establish the cost-effectiveness and mortality benefits of ICDs in these populations.
• Inappropriate shocks and lead dysfunction are key complications, with home-monitoring offering potential for early detection.