May not happen: Heart failure generally refers to dysfunction in the pumping action of the heart (various types exist). Defibrillation is basically an electric shock designed to "reset/restart" the conduction system of the heart (during an arrhythmia). Heart failure increases risk of arrhythmia, but doesn't guarantee it will happen. Live healthy, follow tx & doctor's recc's , and hopefully it won't happen.
Answered 5/26/2016
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