What is an EMG
This is a test of the electric conductivity of the nerves of the body. This can be done by measuring the transit time in nerves and measuring the response in the muscles that are served by these nerves.
The measuring instrument is a small needle that is placed into the muscle and then connected to a machine that measures very small electric impulses. When your doctor receives a report that there is slowing in one of the nerves this may indicate, amongst other things, that the nerve is being compressed by a lesion like a slipped disc.
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