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Updated: Aug 11, 2026
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A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation
Published on: February 28, 2012
Evidence-based medicine and the implantable defibrillator
1Electrophysiology Section, Allegheny General Hospital, Pittsburgh, PA 15212, USA.
Current Cardiology Reports
|September 12, 2000
Summary
Implantable defibrillators are now recommended for patients with symptomatic ventricular arrhythmias. For primary prevention in high-risk patients, defibrillators show survival benefits, warranting consideration despite screening inconvenience.
Area of Science:
- Cardiology
- Electrophysiology
- Medical Devices
Background:
- Implantable defibrillators (ICDs) are established treatments for symptomatic ventricular tachyarrhythmias.
- Primary preventative use of ICDs for at-risk patients without prior events is less defined.
- Existing evidence supports ICDs in specific high-risk patient groups.
Purpose of the Study:
- To review the current evidence supporting implantable defibrillator use in clinical practice.
- To evaluate the role of ICDs in primary prevention of sudden cardiac death.
- To inform clinical decision-making regarding ICD implantation.
Main Methods:
- Analysis of recent randomized clinical trials.
- Evaluation of data from electrophysiologic testing.
- Assessment of survival benefits in patient cohorts.
Main Results:
- Strong evidence supports ICDs as first-line therapy for symptomatic sustained ventricular tachyarrhythmias.
- Two trials show survival benefit for ICDs in patients with ischemic heart disease, low ejection fraction, non-sustained VT, and inducible VT.
- Screening for primary prevention is recommended despite inconvenience.
Conclusions:
- Implantable defibrillators are strongly indicated for patients with symptomatic ventricular tachyarrhythmias.
- ICDs demonstrate a survival benefit for primary prevention in select high-risk ischemic heart disease patients.
- Further trials are needed to broaden the application of ICDs for primary prophylaxis.
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