Ulm, Univ., Diss., 2008.

<p>It is known that there is an intraindividual amplitude variation in motor electroneurography when the same person is examined at different times. This variation affects the evaluation the status of the patient. The aim of this study was to investigate if the intraindividual amplitude variation decreased by photographing the electrode position, that later is used in the follow-up study. Twenty test persons were examined by four laboratory scientists. The nerves that were examined were median, ulnar, peroneal and tibial nerve. At the first examination the laboratory scientists used method guidelines and took photographs of the electrode position. The photographs were then used in the follow-up. The results showed that there was an indication of decreased of the intraindividual amplitude variation when photographic documentation was used instead of method guidelines.</p>

It is known that there is an intraindividual amplitude variation in motor electroneurography when the same person is examined at different times. This variation affects the evaluation the status of the patient. The aim of this study was to investigate if the intraindividual amplitude variation decreased by photographing the electrode position, that later is used in the follow-up study. Twenty test persons were examined by four laboratory scientists. The nerves that were examined were median, ulnar, peroneal and tibial nerve. At the first examination the laboratory scientists used method guidelines and took photographs of the electrode position. The photographs were then used in the follow-up. The results showed that there was an indication of decreased of the intraindividual amplitude variation when photographic documentation was used instead of method guidelines.

No description available.

Thesis (doctoral)--Rijksuniversiteit te Utrecht, 1985. / "Stellingen": leaves inserted. Vita. Includes bibliographical references.

Introduktion: Det perifera nervsystemet består av det autonoma nervsystemet och de perifera nervtrådarna som förmedlar afferenta och efferenta impulser mellan det centrala nervsystemet och perifera delen av kroppen. Från plexus brachialis förgrenar nervus ulnaris sig och fortsätter längst armen till handens ulnara del. Den vanligaste perifera nervskadan i övre extremiteter är ulnarisnervskada. Syftet: Syftet med studien var att undersöka om det förekommer någon signifikant skillnad i motorisk ledningshastighet (MCV) mellan underarm och över armbåge på nervus ulnaris bilateralt. Även att jämföra MCV och proximal latenstid mellan höger och vänster underarm och över armbåge. Metod: För att besvara syftet utfördes en tvärsnittsstudie på 31 friska deltagare i åldrarna 20– 40 år. Nervus ulnaris undersöktes med elektroneurografi bilateralt. Resultat: Resultatet visade att det förekommer en signifikant skillnad i MCV mellan underarm och över armbågen bilateralt på nervus ulnaris. Det påvisades en signifikant skillnad i MCV mellan höger och vänster sida över armbågen, men inte på underarm. Ingen signifikant skillnad förekommer i proximala latenstiden mellan höger och vänster underarm och över armbågen. Slutsats: De signifikanta skillnaderna som erhölls i MCV mellan underarm och över armbåge samt mellan höger och vänster sida över armbågen kan bero på stimuleringstekniken. Såsom armspositionen vid stimuleringen och att överarmar är generellt svårare att undersöka. Detta medför större risk för felkällor som kan påverka resultatet. / Introduction: The peripheral nervous system consists of the autonomic nervous system and the peripheral nerve fibers that mediate afferent and efferent impulses between the central nervous system and the peripheral part of the body. From the brachial plexus, the ulnar nerve branches and continues along the arm to the ulnar part of the hand. The most common and largest peripheral nerve injury in the upper extremities is ulnar nerve injury. Aim: The aim of the study was to investigate whether there is any significant difference in motor conduction velocity (MCV) between the forearm and above the elbow on the ulnar nerve bilaterally. Also, to compare MCV and proximal latency between right and left forearm and above elbow. Method: To answer the purpose, a cross-sectional study was performed on 30 healthy participants aged 20–40 years. The ulnar nerve was examined with electroneurography bilaterally. Results: The result showed that there is a significant difference in MCV between the forearm and above the elbow bilaterally on the ulnar nerve. A significant difference in MCV was demonstrated between the right and left sides over the elbow, but not on the forearm. There was no significant difference in the proximal latency between the right and left forearm and above the elbow. Conclusion: The significant differences obtained in MCV between forearm and above elbow and between right and left side above elbow may be due to the simulation technique. Such as the arm position during the stimulation and that upper arms are generally more difficult to examine. This entails a greater risk of error sources that can affect the result.

Bakgrund: Det perifera nervsystemets axon utgår från cellkroppar i ryggmärg eller hjärna och går ut till kroppens perifera delar. Det perifera nervsystemet undersöks med hjälp av elektroneurografi. Elektroneurografi kan utföras antingen antidromt, där mätningen sker i motsatt riktning till nervimpulsens naturliga, eller ortodromt, där nervimpulsmätningen sker i nervens naturliga riktning. Vid elektroneurografi används den nervledningshastighet, amplitud och kurvformation som undersökningen resulterar i för att sätta en diagnos. Studien syftade till att undersöka om det förelåg signifikant sensorisk amplitudskillnad beroende på om antidrom eller ortodrom elektroneurografi användes genom att undersöka nervus medianus och nervus ulnaris, detta för att bedöma om den metod som använts vid framtagandet av referensvärdena har betydelse.  Material &amp; Metod: 33 neurologiskt friska testindivider i åldrarna 18–80 år deltog i studien. Nerverna stimulerades i handledsnivå och registrering gjordes i fingrarna vid ortodrom elektroneurografi, det omvända gjordes vid antidrom elektroneurografi. Parat t- test användes. Signifikansnivån (α) sattes till 0,05 och normalfördelning ansågs föreligga då median och medelvärde hade en differens på ≤5. Resultat: Det fanns en signifikant amplitudskillnad mellan de båda metoderna vid samtliga mätningar.  Diskussion: Referensvärdena bör baseras på samma metod som kliniken använder för att undvika felaktiga positiva eller negativa diagnoser. / Background: The peripheral nervous system (PNS) goes from the soma in the spinal cord or brain out to the peripheral body parts. The PNS is studied using electroneurography. Electroneurography can be performed either by an antidrome method, which measures against the nerve impulses natural direction, or with an ortodromic method, in which the nerve impulses are measured in its natural direction. In electroneurography the nerve conduction velocity, amplitude and formation are used to make a diagnosis. The aim of the study was to examine if there was a significant difference in sensory amplitude when using an antidrome method compared to an ortodrome method by examining the median nerve and the ulnar nerve, this to be able to determine if the method used to achieve the reference values matters. Materials &amp; Method: 33 neurologically healthy test subjects in the ages 18–80 participated in the study. The nerves were stimulated at the wrist and the registrating electrode was positioned on the fingers by the orthodromic method and the other way around by the antidromic method. Paired t- test was used. The level of significance (α) was placed at 0,05. The data was considered to be normally distributed when the median and mean had a difference of ≤5. Results: There were a significant difference in amplitudes in all of the measurements.  Discussion: The reference values should be produced using the same method that is used in the clinic to avoid misdiagnosis.