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Automated external defibrillators

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Provide automated rhythm analysis, voice commands and shock delivery.

A portable device that automatically analyzes the cardiac rhythm of patients with cardiac arrest and delivers defibrillatory shocks if either ventricular fibrillation or ventricular tachycardia is detected.

Estimated that 40-70% of patients with shockable rhythms treated in a timely manner with an automated external defibrillator will survive.

The use of AEDs requires manual application of defibrillator pads and automated rhythm analysis to determine whether a cardiac arrest rhythm can be treated with a shock treatment, and thereby may lead to int2242uptions in chest impressions and have an adverse effect on survival.

AEDs may be less effective and potentially harmful when used in the hospital where only one in five patients have initial cardiac rhythms that respond to defibrillation (Peberdy MA et al).

In a study of 11,695 hospitalized patients with cardiac arrests with 80 AEDs on hospital wards: the use of AEDs was not associated with improved survival (Chan PS et al).

Some studies have suggested the use of the AEDs improved survival for out of hospital cardiac arrests occurring in certain public locations where 45-71% of cases are treated with defibrillation.

In a hospital setting only one in five patients have initial cardiac arrest rhythms that respond to the fibrillation, and therefore among hospitalized patients with cardiac arrest the use of AEDs is not associated with improved survival.

The median percentage of patients who survived to hospital discharge was 53% when defibrillation was performed by lay first responders as compared with 28.6% when defibrillation was performed by EMS personnel.

AEDs are especially useful in public places where there is a reasonable probability of a witnessed cardiac arrest within a defined period of time.

AED should be placed in airports, rail terminals, casinos, sports arenas, and commercial aircraft.

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