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Defibrillator: Its Different Forms and Uses

A defibrillator is one very essential medical device. When a patient experiences ventricular fibrillation or ventricular tachycardia and thus dangerously fast and chaotic heartbeat, defibrillation is done to restore a normal heart rhythm. Also, patients with arrhythmogenic right ventricular dysplasia, cardiomyopathy, QT syndromes and survivors of sudden cardiac death need defibrillation. Using defibrillators help prevent cases of cardiac arrest and cardiac death.

Defibrillation is the ultimate treatment for life-threatening cardiac arrhythmias ventricular fibrillation and pulseless ventricular tachycardia. To deliver a therapeutic jolt of electrical energy to the affected heart, a defibrillator is used. Such treatment restores normal heart rhythms before cardiac arrest occurs. It works by depolarizing a critical mass of the heart muscle, stopping the arrhythmia, and reestablishing normal sinus rhythm.

Defibrillators have several forms and sizes. Manual defibrillators or defibrillator paddles are what you see in a clinical setting such as the hospital. They can only be used by trained and skilled healthcare professionals. Automatic external defibrillators or AED can be used by lay people with only less training, which makes it perfect for emergency instances where no healthcare professional is present. ICDs or implantable cardioverter defibrillators are implanted in the patient’s chest.

Manual defibrillators can either be external or internal. External types work with electrocardiogram readers, which allow the clinician to diagnose a cardiac condition. Then, basing on previous knowledge and experience, the clinician will deliver the appropriate charge in joules through pads or paddles on the patient’s chest. Doing so requires detailed medical knowledge, and for this reason, these units are usually found only 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.

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.

ICDs or implantable cardio-verter defibrillators are another form. Such units are implantable (patient’s chest), and can perform the same function as pacemaking. ICDs regularly check on the patient’s heart rhythm, and if required, also corrects arrhythmia or abnormal heart rhythm based on the device’s programming. The pacemaker can be used together with ICDs for events that involve treating 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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