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Various Forms and Uses of a Defibrillator

In the field of medicine, a defibrillator plays a very essential role. When heartbeat becomes dangerously fast and chaotic due to ventricular fibrillation or ventricular tachycardia, defibrillators deliver an electrical shock to the heart to restore a normal heart rhythm. Using it helps prevent cardiac arrest and cardiac death from happening. Patients with cardiomyopathy, arrhythmogenic right ventricular dysplasia, QT syndrome or survivors of sudden cardiac death require defibrillation.

For life-threatening cardiac arrhythmias ventricular fibrillation and pulseless ventricular tachycardia, defibrillation is the definitive treatment. In this treatment, a defibrillator is used to deliver a therapeutic dose of electrical energy to the affected heart. Before the affected heart suffers from sudden cardiac arrest, defibrillation works to restore normal heart rhythms. It depolarizes a critical mass of the heart muscle, ends the arrhythmia, and reestablishes normal sinus rhythm.

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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.

Manual internal defibrillators are similar to manual external defibrillators. Only, internal leads which are in direct contact to the heart are used to deliver the shocks. The leads function both ways: either to detect an abnormal rhythm or to deliver the actual shock. Usually, you can find such units in operating rooms, where the chest is likely to be open, or can be easily opened by a surgeon.

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For emergency purposes, automated external defibrillators are available. These units rely on computer technology to analyze the heart rhythm and advise whether a shock is needed. AEDs can be used by lay persons, who call for little training. Generally, they are held by qualified personnel who will attend incidents or are PADs or public access defibrillators that can be found in airports, hotels, shopping centers, and corporate or government offices, among others.

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 some of the various forms and uses of a defibrillator. Although they vary in shapes and sizes, all of them aim to convert an unhealthy cardiac rhythm into a more standard rhythm. It plays a significant role in saving lives of people, whether the unit is automated or manual, internal or external, or used by medical professionals or lay men.

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