Somatosensory evoked potentials(SEPs) has been an important part of electrodiagnosis and has been utilized as a clinical diagnostic technique in various neurological disease. The purpose of this study was to evaluate the utility of SEPs in the analysis of sensory deficit as an objective method. The test was performed on the two groups of patients with cerebrovascular disease associated with motor and sensory impairment (grouip A) and pure motor impairment (group B), and then the results are compared with that of normal age-matched group. The results are as follows: 1. There is no significant difference in the abnormalities of N9 and N14 component between group A and B (P>0.05). 2. There is no significant difference in the decreased amplitude of N20 component (P>0.05), but there is a significant difference in the delayed peak latency or absent wave of N20 component(P<0.01) between group A and B. 3. There is a significant difference in the increased central conduction time between group A and B (P<0.01). 4. Although the difference is not significant statistically, there are more abnormalities of N20 or central conduction time in the intact hemispheres in group A than group B after stimulation of the median nerves of the affected sides.
Electrodiagnosis ; Evoked Potentials, Somatosensory* ; Humans ; Median Nerve

Acute organophosphate intoxication has characteristic electrophysiological features, which include repetitive potentials in nerve conduction studies and decrement (or decrement-increment) responses in repetitive nerve stimulation tests. We experienced a patient who presented with abdominal discomfort, followed by cardiac arrest and then showed motor weakness. The electrophysiological studies revealed decrement responses which were characteristic features of acute organophosphate intoxication. We report clinical and electrophysiological features of acute organophosphate intoxication followed with a literature review.
Electrodiagnosis ; Heart Arrest ; Humans ; Neural Conduction

Nerve conduction study has been an important part of electrodiagnosis and has been utilized as a clinical diagnostic technique in diabetic neuropathy. But conduction study of the more proximal segment has been a few reports. This study demonstrated segmental method for obtaining orthodromic motor nerve conduction and mixed nerve conduction, and antidromic distal sensory nerve conduction in diabetic group and normal group. The purpose of the study was to determine diagnostic value of segmental nerve conduction in diabetic neuropathy. The results were as follows: 1. Significant difference at P<0.01 between diabetic group and normal group; in median motor terminal latency, median motor nerve conduction velocity at axilla-elbow segment and elbow-wrist segment, median sensory nerve conduction velocity at wrist-elbow segment, ulnar motor and sensory conduction velocity at wrist-elbow segment, posterior tibial motor nerve conduction velocity at popliteal fossa-ankle segment, peroneal motor nerve conduction velocity at fibula head-ankle segment. 2. No significant difference at P>0.05 between diabetic group and normal group; in ulnar motor terminal letency, ulnar sensory nerve conduction velocity at axilla-Erb's point segment and finger-wrist segment, peroneal motor terminal latency and peroneal motor nerve conduction velocity at popliteal fossa-fibula head segment, posterior tibial motor terminal latency, sural sensory nerve conduction velocity. 3. The nerve conduction of proximal segment is more statistically significant than that of distal segment.
Diabetic Neuropathies ; Electrodiagnosis ; Fibula ; Head ; Neural Conduction*

Peripheral neuropathy constitutes a rare clinical manifestation in the neurofibromatosis. Eleven cases of peripheral neuropathy associated with the neurofibromatosis have been reported. We report a sensorymotor peripheral neuropathy in 2 cases of neurofibromatosis.
Electrodiagnosis ; Neurofibromatoses ; Peripheral Nervous System Diseases ; Polyneuropathies*

We report a case of clinical features corresponding to Eosinophilia-Myalgia syndrome, with no causal relationship with L-tryptophan. Since the epidemic of L-tryptophan associated Eosinoghilia-Myalgia Syndrome in 1989, only 2% of the cases were found not to be related to L-tryptophan in America. We believe that this is the first case report of Eosinophilin-Myalgia Syndrome not related to L-tryptophan in Korea.
Americas ; Electrodiagnosis ; Eosinophilia-Myalgia Syndrome* ; Korea ; Tryptophan*

In clinical settings, electrodiagnosis is used for the differential diagnosis of neuropathy and myopathy, as well as detremining severity and localization of lesions in the neuromuscular system. By many authors, various methods of the study and factors influencing the results were verified so far. However, the results vary according to methods or influencing factors during electrodiagnostic studies. Since there has been no standardization in methods of the study and study environment, we sometimes feel difficulties in interpretation of study results and in exchage of findings of study among laboratories. In this study, we have collected standards and norms used by different electrodiagnostic laboratories in Korea, hoping that we can come up with one nationwide standards and norms in Korea.
Diagnosis, Differential ; Electrodiagnosis* ; Hope ; Korea* ; Muscular Diseases

OBJECTIVE: To determine which ultrasonographic measurement can be used as an indicator reflecting the severity of carpal tunnel syndrome (CTS), by comparing electrodiagnostic results with ultrasonographic measurements in females. Many previous studies have tried to reveal that the ultrasonography (US) can possibility be used for diagnosis and severity of CTS. However, the criteria are different by gender. Thus far, there have been many efforts towards providing patients with a CTS diagnosis and severity prediction using US, but studies' results are still unclear due to lack of data on gender differences. METHODS: We collected data from 54 female patients. We classified the severity of CTS according to electrodiagnostic results. Ultrasonographic measurements included proximal and distal cross-sectional areas of the median nerve and carpal tunnel. RESULTS: The severity by electrodiagnostic results statistically correlated to the proximal cross-sectional area (CSA) of the median nerve and carpal tunnel. However, there was no relationship between the proximal and distal nerve/tunnel indexes and the severity by electrodiagnostic results. CONCLUSION: In female patients with CTS, the proximal CSAs of the median nerve and carpal tunnel increase. They correlate with the severity by electrodiagnostic findings. The CSA of the proximal median nerve could be particularly used as a predictor of the severity of CTS in female patients. However, the nerve/tunnel index is constant, irrespective of the severity of CTS.
Carpal Tunnel Syndrome* ; Diagnosis ; Electrodiagnosis ; Female* ; Humans ; Median Nerve ; Ultrasonography

OBJECTIVE: This study was done to evaluate the correlation between carpal tunnel pressure (CTP), electrodiagnostic and ultrasonographic findings in patients with carpal tunnel syndrome (CTS). METHODS: CTP was measured during endoscopic carpal tunnel release (ECTR) for CTS using Spiegelberg ICP monitoring device with parenchymal type catheter. Neurophysiologic severity and nerve cross sectional area were evaluated using nerve conductive study and ultrasonography (USG) before ECTR in all patients. RESULTS: Tests were performed in a total of 48 wrists in 39 patients (9 cases bilateral). Maximum CTP was 56.7 +/- 19.3 mmHg (Mean +/- SD) and 7.4 +/- 3.3 mmHg before and after ECTR, respectively. No correlation was found between maximum CTP and either neurophysiologic severity or nerve cross sectional area, whereas we found a significant correlation between the latter two parameters. CONCLUSION: CTP was not correlated with neurophysiologic severity and nerve cross sectional area. Dynamic, rather than static, pressure in carpal tunnel might account for the basic pathophysiology of CTS better.
Carpal Tunnel Syndrome ; Catheters ; Cytidine Triphosphate ; Electrodiagnosis ; Humans ; Wrist

It is not well known how the un-operated contralateral hand behaves in bilateral carpal tunnel syndrome(CTS). Out of 324 CTS patients, we studied 20 who had carpal tunnel release on one hand only, in order to evaluate the postoperative outcome of the un-operated contralateral hand in bilateral carpal tunnel syndrome. All 324 patients were subject to clinical and electrodiagnostic studies on both hands. This study group was composed of patients who had bilateral CTS, diagnosed clinically and electrophysiologically, but who had surgery done only on the hand with the most pronounced symptoms. The results of the electrodiagnosis were categorized according to the severity of median nerve damage (mild, moderate, severe). The decision for surgery was based on clinical assessment and electrodiagnostic study. The outcome and postoperative clinical course of the un-operated contralateral hand were evaluated by EMG and telephone survey. This method of survey was used because of the patients' residence area spread throughout the country. Within one year, all 20 operated hands showed significant improvement. Regarding progress of the un-operated contralateral hand, 10 patients showed improvement of one grade, while five patients showed three grades of improvements. In five other patients, there was no change whatsoever. The postoperative EMG findings of the un-operated contralateral hand did not commensurate with the symptoms. However, regardless of EMG results, the un-operated contralateral hand showed improvement that was of statistical significance(p < 0.0001).
Carpal Tunnel Syndrome* ; Electrodiagnosis ; Hand* ; Humans ; Median Nerve ; Telephone

No abstract available.
Electrodiagnosis ; Hypokalemic Periodic Paralysis ; Neural Conduction* ; Paralysis* ; Thyrotoxicosis