[Automatic analysis of the interference EMG of the brachioradial muscle in neuropathy of the radial nerve].

In 8 patients with radial neuropathy the authors studied histograms of distribution of potentials of motor units (PMU) by their duration, as well as of the number of intercrossings (T) and the mean amplitude of interference EMG of the musculus brachioradialis. The findings included a decrease in the T value and T/M ratio in the presence of an insignificant shift of the histograms and of the mean duration of PMU. With regard to the diagnosis of early neuropathies a reduction in the average value of T and T/M in the presence of ungraded voluntary tension of the muscle is diagnostically more important than changes in the duration of individual PMU.

[Diagnosis of variants of neuropathies using the standardized methodology of quantitative analysis of the interference EMG].

In examining 36 patients with neuropathies the authors used standardized leads and a quantitative analysis of the interferential EMG and established the criteria for the differential diagnosis of radiculopathies, neuropathies in particular. Comparison with the findings of analysis of potentials of motor units showed that a "myopathic" shift revealed in some patients was due to stage characteristics of denervation and re-innervation process.

[Contractile properties of reinnervated skeletal muscle and their relation to the degree of nerve damage].

Experiments with 22 rats have shown that the anterior tibial muscle in the stage of incomplete reinnervation is marked by decreased force and retardation of the semi-relaxation of an isometric contraction. In completely reinnervated muscles, the changes in the contractility are determined by the degree of nerve damage. The group of animals with the sciatic nerve injury demonstrated the contractility characteristic of a slower muscle, in contrast to the group with the fibular nerve damage.