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The cardiac devices which are used to shock the heart back to normal are found not to be working just when you need them. One out of five fails to work after just ten years. Research has found that the wires that connect are many times defective.
The wire or the lead sometimes shocked the heart unnecessarily or failed to work when heart is beating abnormally or completely stopped. If the lead wires have defects, they have to be changed or the device cannot terminate fibrillation. The failure appears to be more common in women, younger people and those whose left ventricle was healthier when the device was implanted. It is a simple case wear and tear after many years of usage.
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