AED Heartstart defibrillators are becoming increasingly commonplace and popular as the technology behind them improves making them easier to operate thus enabling them to be utilised more extensively. There are some big companies behind the development of these portable devices designed to save lives. Some of these medical companies include: Zoll, Phillips, Medtronic and Cardiac Science. So what does an AED do?
An AED or Automatic External Defibrillator is a battery powered light weight portable electronic devise that is designed to generate a measured charge in joules that can be delivered via electronic pads. These pads are attached to the chest of a person who is suspected of suffering from a sudden cardiac arrest (SCA). SCA is when the heart rhythm goes into either ventricular fibrillation (VF) where the heart appears as a bowl of jelly that is being shaken or ventricular tachycardia (VT) where the heart is beating very fast. Either rhythm is inefficient and such results in the heart not pumping effectively so it cannot circulate blood around the body as it cannot maintain the blood pressure and the person will die if not resuscitated.
An AED by defibrillating or shocking the heart is like hitting the hearts reset button so that the shock stops the heart. By making the heart stop still, the hearts own pacemaker some specialised heart cells known as the "AV node" can once again control the rate and rhythm of the heart. The external compressions of the heart and artificial ventilation of the lungs that make up CPR are not enough to successfully resuscitate an unconscious person in either VF or VT, they generally also require the "reboot" that an AED can deliver.
Unfortunately once the heart goes into either of these life threatening rhythms the clock is ticking as research has shown us that the hearts ability to be able to resume a normal rhythm diminishes by approximately ten percent with each passing minute without being defibrillated by an AED. So you do the math, after ten minutes you are at one hundred percent and defibrillation may no longer be effective. This is why it is vital that an AED Heartstart Defibrillator be available just as soon as possible when they are required in an emergency. This plus the AED's affordability is why you will nowadays find an AED wherever people tend to congregate in groups for example: clubs, shopping malls, airports, etc. This can save precious time waiting for paramedical services to arrive with an AED.
Richard D Williams,
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