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[Electroneuromyographic criteria of partial motor conduction block and temporal dispersion in patients with alcoholic polyneuropathy].

The aim of the investigation was to determine electroneuromyographic diagnostic criteria of conduction block (CB) and temporal dispersion on the basis of 78 healthy volunteers and 82 patients with alcoholic polyneuropathy examination. We investigated motor fiber ulnar, median, peroneal and tibial nerves on distal segments of extremities at the level of forearm and leg, respectively. We determined a percentage of the maximal degree of negative peak (NP) and "peak to peak" amplitude reduction, the NP area and the total M-response as well as the degree of NP duration increase and the total M-response obtained from proximal nerve stimulation point versus to distal one. The area of M-response was shown to be the less changeable index, while the degree of amplitude, area and M-response duration changes depended on the nerve studied. The greatest changes of these parameters were revealed during a tibial nerve study in the controls and in the patients with alcohol polyneuropathy. The CB presence proves being identified when the proximal NP area reduction and the total M-response is over than 30 and 35%, respectively. The temporal dispersion can be confirmed if NP duration increase is over than 30%. CB is likely suspected when the proximal NP area and the total M-response reduction is greater than 20 and 25% for the peroneal, ulnar and median nerves.