Background: Nerve conduction studies (NCSs) help in delineating the extent distribution of neural lesion, and the diagnosis of peripheral nerve disorders. Because normative nerve conduction parameters were not yet established in Sudan EMG laboratories, this study aims towards having our own reference values, as we are using the American and British parameters. This will allow avoiding the discrepancies that might be induced by many factors. Methods: NCSs were performed in 200 Median nerves of 100 adult healthy Sudanese subjects using standardized techniques. Results: The median SNAP (sensory nerve action potential) values were as follows: distal latency, 2.6±3 ms with a range of (2.3-2.9); peak latency, 3.5±0.5 ms (3.0-4.0); amplitude, 47.7±18.0μV (29.7-65.7); conduction velocity, 53.0±7.8 m/s (45.2-60.8). The following values were obtained for the Median nerve CMAP (compound muscle action potential) at wrist stimulation: distal latency, 3.5±0.5 ms with a range of (3.0-4.0); peak latency, 9.4± 1.0 ms (8.4-10.4); duration, 5.9±0.9 ms (5.0-6.8); amplitude, 12.3±2.5 mV (9.8-14.8); area, 43.0±10.4 mVms (32.6-53.4); conduction velocity, 63.6±6.2 m/s (57.4-69.8). The F wave was 28.4±1.8 ms (26.6-30.2). Conclusion: The overall mean sensory and motor nerve conduction parameters for the tested nerve compared favorably with the existing literature with some discrepancies that were justified.
Background: Nerve conduction studies (NCSs) are an invaluable aid to investigate and quantify the physiological activity of peripheral nerves. They include measurement of sensory and motor conduction velocities and latencies of peripheral nerves which might be influenced by anthropometric factors like age, sex, height, weight, temperature and (body mass index) BMI. Objective: As mentioned in the companion paper, normative NCS parameters were lacking in Sudan, hence the aim of this study is to establish our own EMG normal neurophysiological values among adult Sudanese people. Method: A descriptive, analytic, cross sectional study investigating 200 Peroneal nerves of 100 healthy Sudanese people was conducted in Elmagzoub Neuroscience Center; supported by the Faculty of Medicine, National Ribat University, Khartoum, Sudan. Results: The normative neurophysiologic values of the Left and Right peroneal nerve CMAP (compound muscle action potential) in the whole sample of this work were shown as; latency (ms), amplitude (mV), duration (ms), area (mVms) and conduction velocity (m/s). The Left Peroneal values were 6.1±7, 2.6±0.5, 3.6±0.9, 13.8±6.1 and 46.5±2, respectively. The right peroneal values were 5.7±2.3, 3.6±0.9, 5.7±1.3, 15.7±7 and 48.3±4.5, respectively. Conclusion: Most EMG laboratories worldwide depend on reference values originated in Caucasian populations. Consequently, this is a second of serial NCSs of common peripheral nerves, performed in Afro-Arab ethnic Sudanese population, aiming to determine if there are any diverse values between this group and the aforementioned. Eventually this work will allow us to have our own NCS reference parameters.
BackgroundNerve conductive studies (NCS) are the most informative portion of the electrodiagnostic evaluation for peripheral neuropathy; NCS can be extremely useful both in localizing lesions and determining the pathological processes. Recently, there is increased interest in quality of normative values for each test result and compare should be done between normal and patients regarding specific disease. So, The aim of our study is to help establish NCS normative data of tibial nerve that could be applicable in the Sudanese population and can be used in neurophysiology departments around the country and to compare with those data published in the literature, and to survey the effects of Age, Gender, Height, Weight and Temperature on Nerve Conduction Study Parameters.MethodsNCSs were performed in 210 tibial nerves of 105 adult healthy Sudanese subjects using standardized techniques.ResultsIt was found that the tibial nerve component values as follows; the distal latency is 4.063±1.0533 m/sec, Proximal latency 13.238 ±1.7253 m/sec, Conduction velocity 48.58±5.634 m/sec, F wave 51.509±6.1013 m/sec, Duration of CMAP at ankle 6.199± 1.0254 m/sec, Amplitude of CMAP at ankle 8.528±3.6658 μV, Area of CMAP at ankle 17.569±7.7389μV/ms, Duration of CMAP at popliteal 7.075±1.3173 m/sec, Amplitude of CMAP at popliteal 6.343±3.2871μV and Area at popliteal 14.914±7.8684 μV/ms.ConclusionThe tibial motor nerve conduction parameters for the tested nerve compared favorably with the existing literature with some discrepancies that were justifiedSignificanceThis is the first study to establish reference values for tibial NCS carried out Sudanese population.
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