Open AccessREVIEW ON METHODOLOGY AND INTERPRETATION OF RESULTS OF MOTOR EVOKED POTENTIALS INDUCED WITH MAGNETIC FIELD OR ELECTRICAL STIMULI RECORDED PREOPERATIVELY OR INTRAOPERATIVELY
Author(s) -
Anna Garasz,
Juliusz Huber
Publication year - 2021
Publication title -
issue of rehabilitation, orthopaedy, neurophysiology and sport promotion-irons
Language(s) - English
Resource type - Journals
ISSN - 2300-0767
DOI - 10.19271/irons-000131-2021-34
Subject(s) - medicine , evoked potential , lumbar , stimulation , transcranial magnetic stimulation , neurophysiology , latency (audio) , electrophysiology , electromyography , audiology , anesthesia , physical medicine and rehabilitation , surgery , psychiatry , electrical engineering , engineering
The method of motor evoked potentials recordings induced with magnetic field (MEP) (as part of the differential diagnosis of disease in the musculoskeletal system before the introduction of treatment) and motor evoked potentials induced with electrical stimuli (during intraoperative neuromonitoring) is particularly intensively used among clinical neurophysiology studies in the last twenty years. Aim The aim of the study is to review the practical usefulness of MEP in clinical diagnostics and present the most common examples of the application of this method, the possibility of modifications aimed at increasing non-invasiveness, safety and diagnostic precision. Material and methods The results of pilot tests of different variants of MEP recordings are presented preoperatively from muscles and nerves of the lower extremities in healthy volunteers (N = 10) and patients with disc-root conflicts (N = 15). Results Pilot tests show that in healthy people after oververtebral stimulation with the magnetic field at the lumbar level, the MEP amplitude and latency parameters recorded from nerves compared to those recorded from muscles are characterized by lower values (amplitudes by about 50%, latencies with mean at about 3 ms) and the time duration is increased by approximately 20%. The variability of MEP parameters is similar in patients with disc-root conflict in preoperative diagnostics, even though mean amplitude values from muscles were lower in comparison to healthy control group. Conclusions The MEP recording method from nerves vs. muscles after oververtebral stimulation with the magnetic field at the lumbar level in patients with disc-root conflict is diagnostically essential in cases of visible atrophic changes in muscles with symptoms of slight pathology in the transmission of nerve impulses in motor axons. Keywords: motor evoked potentials, neurophysiological diagnostics, neuromonitoring, methodological modifications