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Cardiovascular Disease: Cardioverter-Defibrillators and Left Ventricular Assist Devices
1Womack Army Medical Center Department of the Army, WAMC Stop A 2817 Reilly Rd, Ft Bragg, NC 28310-7301.
Insights
Sudden cardiac death (SCD) is often caused by arrhythmias. Wearable cardioverter-defibrillators and implantable cardioverter-defibrillators (ICDs) can treat these events, with LVADs supporting end-stage heart failure patients.
Area of Science:
- Cardiology
- Biomedical Engineering
Background:
- Sudden cardiac death (SCD) is an abrupt death from cardiac arrhythmias.
- Cardioverter-defibrillators are key in managing life-threatening arrhythmias.
- Implantable cardioverter-defibrillators (ICDs) and wearable cardioverter-defibrillators (WCDs) offer distinct therapeutic options.
Purpose of the Study:
- To describe the indications and applications of wearable cardioverter-defibrillators (WCDs).
- To outline the roles of implantable cardioverter-defibrillators (ICDs) in primary and secondary prevention of SCD.
- To explain the function and indications for left ventricular assist devices (LVADs) in end-stage heart failure.
Main Methods:
- Review of current clinical indications for WCDs, ICDs, and LVADs.
- Description of device mechanisms for arrhythmia detection and treatment (WCDs, ICDs).
- Explanation of LVADs' role in mechanical circulatory support for heart failure.
Main Results:
- WCDs are suitable for temporary SCD risk, contraindications to ICDs, or as a bridge therapy.
- ICDs are indicated for survivors of cardiac arrest and high-risk patients.
- LVADs provide circulatory support for end-stage heart failure, bridging to transplant or as destination therapy.
Conclusions:
- WCDs and ICDs provide crucial interventions for preventing SCD.
- LVADs represent a vital treatment for advanced heart failure.
- These devices address different facets of critical cardiovascular conditions, improving patient outcomes.
Abstract:
Sudden cardiac death (SCD) is an abrupt and unexpected death presumed to be due to cardiac causes. The primary etiologic mechanism is cardiac arrest due to an arrhythmia. Cardioverter-defibrillators detect abnormal arrhythmia and abort the rhythm with an electrical shock. Wearable cardioverter-defibrillators are devices in which the leads contact the chest on a vest worn by the patient. Wearable devices are for patients at temporary risk of SCD, when comorbidities prohibit placement of an implantable cardioverter-defibrillator (ICD), or as a bridge to ICD placement or heart transplantation. ICDs are indicated for patients who have survived sudden cardiac arrest (secondary prevention) and patients with conditions that put them at increased risk of SCD (primary prevention). Left ventricular assist devices (LVADs) are surgically implanted on the exterior of the heart. They draw blood out of the heart through a cannula placed through the wall of the left ventricle and pump it, via a conduit sewn into the aorta, into the circulation. LVADs are indicated for patients with ionotropic, drug-dependent, end-stage heart failure as a bridge to transplantation or as a final therapy if transplantation is not possible.
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