[Study of muscular evoked potentials by the built-up current in diagnosis of nerve injuries]

In 129 patients the diagnosis was defined over periods from 1 month to 2 years following the damage of the nerves with the help of myopotentials evoked through stimulation of the nerves with batches (charges) of a built-up current of varying frequency lasting for 1 second. With the lability of the neuro-muscular system falling from 35 down to 10 pulses/sec, a reduced amplitude of periliminal peak potentials, post-tetanic after-potentials and in the absence of pessimal inhibition of up to 1000 pulses/sec the operative treatment is, as a rule, not indicated. Late after injury and with a low amplitude of evoked myopotentials, falling down to 5--26 mug, an amplitude transformation from 2 up to 10 pulses/sec, the absence of periliminal rising peak potentials and post-tetanic after-potentials (spikes) surgery is commonly indicated. The operative intervention is also indicated in the absence of all types of the evoked myopotentials when this is combined with other factors.