Steps of the Needle Electromyography Examination
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چکیده
Insertional activity is examined by moving the needle through the muscle briefly and observing the crispness, size, and duration of the electrical potentials produced. These potentials are mechanically evoked injury potentials due to the advancement of the needle. After a brief, small movement of the needle, insertional activity will usually persist no more than 300 ms. However, this duration is dependent upon individual technique; hence practicing evaluation of insertional activity at slow sweep speeds (e.g., 100 ms/div) is useful.
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