[Occurrence of spontaneous electromyographic repetitive activity]

Spontaneous repetitive activity of different types reflects the reduced threshold of excitability of the peripheral motor neuron under different conditions of its irritation. In addition to tetanic syndrome it is found in rare instances also in amyotrophic lateral sclerosis, polyneuropathy, myositis, traumatic nerve damage, Isaacs syndrome. Probably it develops in distant portions of the motor neuron as a result of changes of the accommodating ability of nerve fibres. The authors demonstrate spontaneous repetitive activity in postparetic hemispasm of the facial nerve, polyneuropathy and generalized scleroderma.