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Related Concept Videos

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Introduction to AEDAn Automated External Defibrillator (AED) is a portable medical device that analyzes the heart's rhythm and, if necessary, delivers an electrical shock to help the heart re-establish an effective rhythm during sudden cardiac arrest (SCA). SCA occurs when the heart suddenly and unexpectedly stops beating, leading to a loss of blood flow to the brain and other vital organs. In such emergencies, time is of the essence, and using an AED, combined with Cardiopulmonary...
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Related Experiment Video

Updated: Apr 23, 2026

A New Single Chamber Implantable Defibrillator with Atrial Sensing: A Practical Demonstration of Sensing and Ease of Implantation
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Subcutaneous implantable cardioverter-defibrillator: Initial experience.

Pedro Galvão1, Diogo Cavaco1, Pedro Adragão1

  • 1Serviço de Cardiologia, Hospital de Santa Cruz, Carnaxide, Portugal.

Revista Portuguesa De Cardiologia : Orgao Oficial Da Sociedade Portuguesa De Cardiologia = Portuguese Journal of Cardiology : an Official Journal of the Portuguese Society of Cardiology
|September 23, 2014
PubMed
Summary

Subcutaneous implantable cardioverter-defibrillators (S-ICDs) offer a promising alternative to transvenous devices, with high implantation success rates and manageable complications. Further long-term studies are needed to confirm their safety and efficacy.

Keywords:
Cardioversor‐desfibrilhador implantávelFibrilhação ventricularImplantable cardioverter‐defibrillatorTaquicardia ventricularVentricular fibrillationVentricular tachycardia

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Area of Science:

  • Cardiology
  • Medical Devices
  • Electrophysiology

Background:

  • Implantable cardioverter-defibrillators (ICDs) are crucial for preventing sudden cardiac death.
  • Transvenous ICD implantation carries risks, including vascular access complications.
  • Subcutaneous ICDs (S-ICDs) present an alternative approach to mitigate these risks.

Purpose of the Study:

  • To evaluate the therapeutic outcomes and complication profile of S-ICD systems.
  • To assess the feasibility of S-ICD implantation in patients with specific indications.

Main Methods:

  • S-ICD implantation was planned for 23 patients with contraindications or high risk associated with transvenous ICDs.
  • Patient cohort included diverse cardiac conditions like ischemic heart disease, Brugada syndrome, and cardiomyopathies.
  • Implantation success, procedure time, and complication rates were recorded.

Main Results:

  • S-ICDs were successfully implanted in 21 of 23 patients, with a mean implantation time of 77 minutes and no immediate complications.
  • During a mean 14-month follow-up, 10 patients received S-ICD shocks, appropriate in 50%.
  • One infection, one device malfunction requiring replacement, and one non-cardiac death were observed.

Conclusions:

  • S-ICD implantation is achievable with high success rates by cardiologists.
  • Initial outcomes suggest a favorable safety and efficacy profile for S-ICDs.
  • Longer follow-up studies are essential to compare S-ICDs with conventional transvenous devices.