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The automatic implantable cardioverter-defibrillator.

M Mirowski, P R Reid, M M Mower

Pacing and Clinical Electrophysiology : PACE

|May 1, 1984

Summary

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The automatic implantable cardioverter-defibrillator (AICD) effectively monitors heart rhythm, identifies dangerous arrhythmias, and delivers life-saving shocks. This technology significantly reduces mortality in high-risk patients by correcting lethal ventricular tachyarrhythmias.

Area of Science:

Cardiology
Biomedical Engineering
Medical Devices

Background:

Malignant ventricular tachyarrhythmias pose a significant threat to patient survival.
Continuous cardiac monitoring and prompt intervention are crucial for managing these conditions.

Purpose of the Study:

To evaluate the efficacy and safety of the automatic implantable cardioverter-defibrillator (AICD).
To assess the impact of AICD implantation on mortality rates in high-risk patients.

Main Methods:

The AICD continuously monitors heart rhythm using defibrillating and ventricular electrodes.
It identifies ventricular fibrillation and tachycardia, delivering synchronized or unsynchronized shocks.
Implantation was performed via thoracotomy or subxiphoid approach in 160 patients.

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Main Results:

The AICD successfully identified and corrected potentially lethal ventricular tachyarrhythmias in implanted patients.
One-year total mortality in the initial 52 patients was 22.9%, a 52% reduction compared to expected rates without the device.
Arrhythmia-attributed mortality was significantly reduced to 8.5%.

Conclusions:

The AICD is a reliable device for managing life-threatening ventricular arrhythmias.
Implantation of the AICD leads to a substantial increase in survival for carefully selected high-risk individuals.