Background and Objective. Needle electromyography can be used to detect the number of changes and morphological changes in motor unit potentials of patients with axonal neuropathy. General mathematical methods of pattern recognition and signal analysis were applied to recognize neuropathic changes. This study validates the possibility of extending and refining turns-amplitude analysis using permutation entropy and signal energy. Methods. In this study, we examined needle electromyography in 40 neuropathic individuals and 40 controls. The number of turns, amplitude between turns, signal energy, and "permutation entropy" were used as features for support vector machine classification. Results. The obtained results proved the superior classification performance of the combinations of all of the above-mentioned features compared to the combinations of fewer features. The lowest accuracy from the tested combinations of features had peak-ratio analysis. Conclusion. Using the combination of permutation entropy with signal energy, number of turns and mean amplitude in SVM classification can be used to refine the diagnosis of polyneuropathies examined by needle electromyography.

Department of Computing and Control Engineering Institute of Chemical Technology Technická 5 166 28 Prague 6 Czech Republic

Faculty of Medicine and University Hospital Hradec Králové Charles University Prague Sokolská Street 581 500 05 Hradec Králové Czech Republic

Faculty of Medicine and University Hospital Hradec Králové Charles University Prague Sokolská Street 581 500 05 Hradec Králové Czech Republic Department of Computing and Control Engineering Institute of Chemical Technology Technická 5 166 28 Prague 6 Czech Republic

Neurocenter Caregroup Ltd Jiráskova 1389 Rychnov nad Kněžnou Czech Republic

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