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Various Forms and Uses of a DefibrillatorA defibrillator plays a very important role in the field of medicine. It is used to restore a normal heart rhythm through sending an electrical shock to the heart when heartbeat becomes dangerously fast due to ventricular fibrillation or ventricular tachycardia. Both conditions may be life-threatening, and could lead to cardiac arrest, and even cardiac death. Other conditions that require defibrillation are long QT syndrome, cardiomyopathy, and arrhythmogenic right ventricular dysplasia and survivors of sudden cardiac death.
Defibrillation is the best treatment for life-threatening cardiac arrhythmias ventricular fibrillation and pulseless ventricular tachycardia. It works by sending a therapeutic jolt of electrical energy to the affected heart through a device called a defibrillator. This treatment depolarizes a critical mass of the heart muscle, stops the arrhythmia, and reestablishes normal sinus rhythm. It restores normal heart rhythms before the affected heart suffers from sudden cardiac arrest.
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Defibrillators come in various shapes and sizes. What you commonly see in the hospital are called manual defibrillators or defibrillator paddles, and they are used by healthcare professionals. The AED or automatic external defibrillators are those that allow lay people to operate it with only minimal training. This is perfect for emergency uses. Implantable cardioverter defibrillators or ICDS are implanted in a patient’s chest.
There are both internal and external manual defibrillators. The clinician diagnoses a cardiac condition through external units that work in conjunction with electrocardiogram readers. After the diagnosis, the clinician then decides on the charge in joules to deliver to the patient’s chest, and sends the shock through pads or paddles. Medical knowledge and experience is needed to perform this treatment, thus they are only generally found in hospitals and some ambulances.
Similar to the external version are manual internal defibrillators. However, for these units, the charge is sent by internal leads in direct contact to the heart. When the heart is experiencing an abnormal rhythm, the leads detect it and deliver the required electrical shock. Typically, you can see these units in operating theatres where the chest is likely to be open.
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Automated external defibrillators are available for emergency purposes. They are preprogrammed units using computer technology that are designed to analyze the heart rhythm and advise whether a shock is required. Lay persons can operate AEDs with minimal training. They are either PADs or public access defibrillators and can be found in corporate or government offices, hotels, airports and shopping centers. Or, they could be held by skilled personnel who will attend incidents.
Implantable cardio-verter defibrillators or ICDs are another type. They are implanted in the patient’s chest, and could function similarly to pacemaking. ICDs continuously observe and monitor the patient’s heart rhythm, and if necessary, also correct an irregular heart rhythm (arrhythmia) depending on the device’s programming. A pacemaker can also be used in conjunction with an ICD to treat complex arrhythmias.
Those are the different types and uses of a defibrillator. But although they are different in shape and size, all of them have a specific goal. That is to convert an unhealthy cardiac rhythm into a more normal rhythm. And whether, it is used by medical professionals or lay men, external or internal, automatic or manual, it helps lessen incidences of cardiac arrest or cardiac death.
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