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Unit 6 распечатать.docx
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Artificial pacemakers

In Britain about 10000 people a year receive an artificial pacemaker. The operation takes less than an hour and is performed under local anaesthetic.

Pacemakers are made up of a pulse generator and two electrodes. The pulse generator is about the size of a thin matchbox and weighs 20 - 60 g. It is powered by a lithium battery and is implanted under the patient's skin. The electrodes are placed intravenously into the right atrium and the right ventricle. Disease or ageing can damage the heart's natural pacemaker and the conduction of impulses through the heart, causing an abnormally slow heart beat. The artificial pacemaker overcomes this by generating electrical impulses artificially and conducting them to the muscles of the heart on demand or when the heart misses a beat.

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