Ulm, Univ., Diss., 2008.

Thesis (doctoral)--Uppsala University, 1983. / Includes bibliographical references (p. 19-21).

<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.

<p>The purpose of this study was to investigate the difference in amplitude between M-response from m. Abductor pollicis brevis/m. Pronator quadratus and m. Abductor pollicis brevis/m. Abductor digiti minimi on patients with carpal tunnel syndrome, compared with control subjects. We wanted to see if m. Pronator quadratus is a better alternative than m. Abductor digiti minimi as comparison with m. Abductor pollicis brevis on patients with carpal tunnel syndrome.</p><p>Nerve conduction studies were performed on 20 patients with carpal tunnel syndrome and on 31 healthy subjects.</p><p>The test-retest result shows that this method was reproducible. The amplitude difference of m. Abductor pollicis brevis-m. Abductor digiti minimi, for the patients, was 1,5mV lower and the amplitude for m. Abductor pollicis brevis-m. Pronator quadratus was 2mV lower than for healthy subjects. Two of the patients were outside the 2SD for the m. Abductor pollicis brevis-m. Pronator quadratus difference but not on the m. Abductor pollicis brevis-m. Abductor digiti minimi. This may indicate that m. Pronator quadratus was better than m. Abductor digiti minimi in the comparison with the m. Abductor pollicis brevis amplitude.</p>

The purpose of this study was to investigate the difference in amplitude between M-response from m. Abductor pollicis brevis/m. Pronator quadratus and m. Abductor pollicis brevis/m. Abductor digiti minimi on patients with carpal tunnel syndrome, compared with control subjects. We wanted to see if m. Pronator quadratus is a better alternative than m. Abductor digiti minimi as comparison with m. Abductor pollicis brevis on patients with carpal tunnel syndrome. Nerve conduction studies were performed on 20 patients with carpal tunnel syndrome and on 31 healthy subjects. The test-retest result shows that this method was reproducible. The amplitude difference of m. Abductor pollicis brevis-m. Abductor digiti minimi, for the patients, was 1,5mV lower and the amplitude for m. Abductor pollicis brevis-m. Pronator quadratus was 2mV lower than for healthy subjects. Two of the patients were outside the 2SD for the m. Abductor pollicis brevis-m. Pronator quadratus difference but not on the m. Abductor pollicis brevis-m. Abductor digiti minimi. This may indicate that m. Pronator quadratus was better than m. Abductor digiti minimi in the comparison with the m. Abductor pollicis brevis amplitude.

No description available.

Elektroneurografi är en undersökningsmetod som används för att undersöka nervledingskapaciteten i perifera nerver. Det är en metod som ofta används på sjukhuskliniker vid diagnostisering av perifera nervsjukdomar. Syftet med studien är att undersöka om det finns en signifikant skillnad i motorisk och sensorisk nervledningshastighet, amplitud och F-respons mellan dominant och icke-dominant hand. I studien undersöktes det även om en korrelation finns mellan handgreppsstyrka och svarsamplitud från motorisk elektroneurografi.  I studien deltog 26 testpersoner från biomedicinska analytikerprogrammet i termin 6. Testpersonernas genomsnittsålder är 24 år (range 21-32 år), och testpersonernas kroppslängd är i genomsnitt 169 cm (range 155- 185). Elektroneurografi utfördes motoriskt och sensoriskt på nervus medianus bilateralt. Handgreppsstyrka undersöktes bilateralt med Jamar Hydraulic Hand dynamometer. För samtliga mätvariabler bestämdes signifikantnivån till α=0,05.  Resultatet visar att det finns en signifikant skillnad i sensorisk nervledningshastighet, motorisk amplitud och sensorisk amplitud mellan dominant och icke-dominant hand. Sensorisk nervledningshastighet är högre i icke-dominant hand, medan motorisk och sensorisk amplitud är högre i dominant hand. Däremot kan inte en signifikant skillnad påvisas i motorisk nervledningshastighet, FM-latens samt antalet F-svar mellan dominant och icke-dominant hand. Resultatet visar att det inte finns någon korrelation mellan handgreppsstyrka och amplitud i motorisk elektroneurografi. I dag används samma referensvärden för dominant och icke-dominant hand. Den här studien visar att det kan finnas ett värde i att utforma referensintervall som baseras på handdominans. / Electroneurography is an examination method used for examining the nerve conduction capacity of the peripheral nerve. The method is often used in hospitals in the diagnosis of peripheral nerve injuries. The aim of this study is to examine if there is a significant difference in motor and sensory nerve conduction velocity, amplitude, and F-response between dominant and non-dominant hands. The correlation between hand grip strength and the amplitude in motor electroneurography was also examined in this study.  The study involved 26 students from Biomedical Scientist Programme term 6. The average age of the participants is 24 years (range 21-32 years), and the participants body length is on average 169 cm (range 155-185 cm). Electroneurography was performed on the median nerve bilaterally. Hand grip strength was examined bilaterally with Jamar Hydraulic Hand dynamometer. For all measurement variables, the significant level was determined to α=0,05.  The result shows that there is a significant difference in sensory nerve conduction velocity, motor amplitude, and sensory amplitude between dominant and non-dominant hands. Sensory nerve conduction velocity is higher in non-dominant hand, while motor and sensory amplitude is higher in dominant hand. However, a significant difference cannot be detected in motor nerve conduction velocity, FM-latency, and the number of F-responses between dominant and non-dominant hands. The result shows no correlation between hand grip strength and the amplitude in motor electroneurography.  Today, the same reference values are used for dominant and non-dominant hands. This study shows that there may be a value in creating reference intervals based on hand dominance.

Median Nerve Ultrasonography Examination Correlates for the Diagnosis of Moderate to Severe Carpal Tunnel Syndrome Objective: The aim of the study was to investigate the associations of cross-sectional area (CSA) of the median nerve measured by ultrasonography (US), the median to ulnar nerve ratio (MUR), the median to ulnar nerve difference (MUD) and the ratio of CSA of the median nerve to height squared (MHS) in relation to electrodiagnostic classification of moderate and severe carpal tunnel syndrome (CTS) and thus to identify patients suitable for surgical treatment. Materials and Methods: A prospective study was conducted in patients aged ≥ 18 years who underwent both median and ulnar nerve US and electrodiagnostic studies (EDS). 124 wrists of 62 patients were examined. The patients' characteristics were acquired through a questionnaire. CTS was diagnosed using EDS and classified according to the guidelines of the Czech Republic Association of Electrodiagnostic Medicine. The CSA of the median nerve and of the ulnar nerve were measured at the carpal tunnel inlet, i.e. at the level of the pisiform bone. Results: The median nerve swells at the wrist in CTS. Median nerve CSA at the tunnel inlet ≥ 12mm2 correlates with electrodiagnostic classification of moderate to severe carpal tunnel syndrome. At...