caa a22 4500 606162887 CHVBK 20210128100641.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s11062-015-9528-8 doi (NATIONALLICENCE)springer-10.1007/s11062-015-9528-8 F-Wave in the Upper Extremities of Patients with Primary Torsion Dystonia [Elektronische Daten] [N. Semerdjieva, D. Atanasova, G. Hranov, I. Milanov] We investigated characteristics of the F-waves in the upper limbs of patients suffering from primary torsion dystonia (PTD) by means of surface-electrode electromyography. Single electric stimulation was used to obtain optimum M-responses from the m. abductor pollicis brevis (median nerve) and m. abductor digiti minimi (ulnar nerve). Ten consecutive supramaximum electrical stimuli were applied to each nerve to obtain F-waves from the wrist. In general, the registered M-response latencies and amplitudes, as well as conduction velocities via all inspected nerves, demonstrated no significant deviations from the normal ranges. Nearly all investigated patients, except one, had normal F-wave minimal latencies. The mean amplitudes of F-waves from both median and ulnar nerves were higher than the average F-wave amplitudes described in the literature. The frequency of occurrence of F-waves in both median and ulnar nerves was greater than in the norm. According to our results, it can be concluded that the amplitude and, to some extent, frequency rather than the latency of F-waves are important in the studies of patients with PTD. Increased amplitudes and frequencies reveal changes in the excitability of alpha motoneurons, which could be accepted as a measure of a disturbed interneuronal balance probably caused by alterations in the suprasegmental control mechanisms related to PTD. Springer Science+Business Media New York, 2015 surface electromyography nationallicence F-wave nationallicence upper extremities nationallicence primary torsion dystonia nationallicence latency nationallicence amplitude nationallicence frequency of occurrence nationallicence Semerdjieva N. UMHATNP "St. Naum,”, Sofia, Bulgaria aut Atanasova D. UMHATNP "St. Naum,”, Sofia, Bulgaria aut Hranov G. UMHATNP "St. Naum,”, Sofia, Bulgaria aut Milanov I. UMHATNP "St. Naum,”, Sofia, Bulgaria aut Neurophysiology Springer US; http://www.springer-ny.com 47/3(2015-06-01), 244-247 0090-2977 47:3<244 2015 47 11062 https://doi.org/10.1007/s11062-015-9528-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11062-015-9528-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Semerdjieva N. UMHATNP "St. Naum,”, Sofia, Bulgaria aut NATIONALLICENCE 700 1- Atanasova D. UMHATNP "St. Naum,”, Sofia, Bulgaria aut NATIONALLICENCE 700 1- Hranov G. UMHATNP "St. Naum,”, Sofia, Bulgaria aut NATIONALLICENCE 700 1- Milanov I. UMHATNP "St. Naum,”, Sofia, Bulgaria aut NATIONALLICENCE 773 0- Neurophysiology Springer US; http://www.springer-ny.com 47/3(2015-06-01), 244-247 0090-2977 47:3<244 2015 47 11062