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Thiru M. Annaswamy, Kimberly Davis, Corey Armstead
Needle electromyography in low cervical paraspinal muscles of a patient with EMG disease demonstrate increased insertional activity and myotonic discharges at 2 different sweep speeds; 20ms (video 1) and 500ms (video 2). Video 1: 20ms sweep displays a myotonic discharge that can appear as fibrillations and positive sharp waves or complex repetitive discharges. Video 2: 500ms sweep reveals the “wax and wane” characteristic specific to myotonic discharges. Myotonic discharges can have variable appearance and sound depending on sweep speed. By definition discharges need to last over 500ms and in 3 or more areas outside of an endplate.