In most cases, the exact cause cannot be determined by the EMG alone. The primary aim of the EMG is to identify the location and source of the problem. The EMG plays a key role in the evaluation of patients with muscle weakness. Each EMG is individualized for each person on the basis of the results of his or her neurological examination. The NCS and needle EMG form the core of an EMG, but an EMG can also include a variety of other specialized examinations. This information is a key part of determining whether a patient has ALS or another condition. Specifically, NCS measures how well your nerves can send signals to your muscles and the needle EMG measures the electrical activity of your muscles. An EMG involves a series of tests, including both nerve conduction studies (NCS) and needle electromyography (needle EMG), that measure your nerve signaling and muscle response. Nerves control the action of the muscles by electrical signals, called impulses. In humans, nerves carry signals from the brain to the muscles.
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