Long-term outcome with the automatic implantable cardioverter-defibrillator

Area of Science:

• Cardiology
• Medical Devices
• Electrophysiology

Background:

• Life-threatening arrhythmias pose a significant risk.
• High-risk patients often have underlying conditions like coronary artery disease and reduced ejection fraction.
• Previous treatments, including antiarrhythmic drugs, frequently fail in these patients.

Purpose of the Study:

• To evaluate the long-term efficacy and safety of the automatic implantable cardioverter-defibrillator (AICD).
• To assess the impact of AICD implantation on sudden cardiac death and overall mortality in high-risk individuals.

Main Methods:

• Retrospective analysis of 270 patients who received AICD implantation over 7 years.
• Inclusion criteria focused on patients with sustained ventricular tachycardia/fibrillation and prior cardiac arrest.
• Data collection included patient history, device performance, complications, and mortality outcomes.

Main Results:

• AICD implantation was performed in 270 high-risk patients with a history of life-threatening arrhythmias.
• The device significantly reduced sudden cardiac death, with a 1-year incidence of 1% and 5-year incidence of 4%.
• Complications included perioperative deaths (4) and generator issues (8); 58% of patients received shocks, with 20% experiencing "problematic" shocks.

Conclusions:

• The AICD is highly effective in nearly eliminating sudden death in high-risk patients.
• The device demonstrates an acceptable complication rate.
• Late mortality in this population is predominantly non-sudden and cardiovascular in origin, often related to congestive heart failure.