Defib

Defib is a colloquial term commonly used to refer to a defibrillator, a medical device used to deliver a dose of electric current (often called a counter-shock) to the heart. The primary purpose of a defibrillator is to treat life-threatening cardiac dysrhythmias, specifically ventricular fibrillation and pulseless ventricular tachycardia.

Types of Defibrillators

There are several types of defibrillators, each designed for different settings and purposes:

• Automated External Defibrillators (AEDs): These are portable devices designed for use by laypersons. AEDs are commonly found in public places such as airports, schools, and sports arenas. They are designed to be easy to use, with voice prompts and visual cues to guide the user through the process of defibrillation.
• Implantable Cardioverter-Defibrillators (ICDs): These are surgically implanted devices that continuously monitor the heart's rhythm and automatically deliver shocks if a life-threatening arrhythmia is detected. ICDs are used in patients with a high risk of sudden cardiac arrest.
• Wearable Cardioverter-Defibrillators (WCDs): These are external devices worn by patients at risk of sudden cardiac arrest. WCDs continuously monitor the heart and deliver a shock if necessary.
• Manual External Defibrillators: These are used by healthcare professionals in hospitals and ambulances. They require the operator to manually assess the heart rhythm and determine the appropriate energy level for the shock.

Mechanism of Action

Defibrillators work by delivering a dose of electric current to the heart. This current depolarizes a large amount of the heart muscle, ending the dysrhythmia and allowing the heart's natural pacemaker to re-establish a normal rhythm. The process involves placing electrodes on the patient's chest and delivering a controlled electric shock.

Usage and Training

While AEDs are designed for use by the general public, proper training is recommended to ensure effective use. Training programs often include Cardiopulmonary Resuscitation (CPR) and the use of AEDs. Healthcare professionals, such as paramedics, nurses, and doctors, receive extensive training in the use of manual defibrillators and ICDs.

History

The concept of defibrillation dates back to the late 19th century, but it was not until the mid-20th century that practical defibrillators were developed. The first successful use of a defibrillator on a human was performed by Claude Beck in 1947. Since then, advancements in technology have made defibrillators more effective and accessible.

Related Pages

• Cardiac arrest
• Cardiopulmonary resuscitation
• Ventricular fibrillation
• Sudden cardiac arrest
• Heart rhythm disorders
• Emergency medical services

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