Effect of Manganese on the Conduction Velocity of Peripheral Nerves in Exposed Workers
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Objective: To study the effect of the manganese exposure on the conduction velocity of peripheral nerves.Methods: Eighty-one subjects with manganese exposure as a case group and 82 normal workers as a control group.The conduction velocity of peripheral nerves was examined by electromyography.(Results:) The results showed that there was a significant difference in the peripheral conduction velocity in which the movement conduction velocity was much slower,the F wave shortest latency and the distal latency was longer in the case group(P0.05).Conclusion: Manganese was harmful to not only the central nerve system but also the peripheral nerve system.The peripheral nerves conduction velocity can be used as a reference parameter for diagnosis of the chronic manganese intoxication.Keywords:
Peripheral Nervous System
F wave
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The ulnar and posterior tibial conduction velocities were measured in 6 untreated and 3 treated cretins. In 4 of the untreated patients, the conduction velocity of both nerves was slower than normal; in 1 patient the ulnar and in the other the posterior tibial nerve conduction velocity was slower than normal. There was a close agreement between bone age and the age corresponding to the slow conduction velocities. The 3 treated cretins all had normal posterior tibial conduction velocities, while the ulnar conduction velocity was normal in one, slower in another, and faster than normal in the third. The slow nerve conduction velocity in cretins probably reflects a delay in maturation of the peripheral nerves. Nerve conduction velocity measurement may be a useful screening test in suspected congenital hypothyroidism, and may also prove of value in assessing response to therapy.
Tibial nerve
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Lead (geology)
Lead acetate
Motor nerve
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The Hoffmann monosynaptic reflex was recorded in the soleus muscle in 105 healthy children aged between 2 days and 5 years. From this the nerve conduction velocity in the proximal segment of the sciatic nerve was calculated. The tibial nerve conduction velocity (motor) was also measured in 59 of these children. The conduction velocity in the proximal and distal parts of the nerve develop in parallel and in an exponential manner but the conduction velocity in the reflex arc (afferent and efferent) is always faster than the motor conduction. Conduction time slightly but significantly decreases during the first year despite the increase in length of the nerve. Thereafter the conduction time slowly increases and by 5 years the values are similar to those in the neonatal period.
F wave
H-reflex
Motor nerve
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Objective] The aim was to study the effect of the manganese intoxication and exposure on the conduction velocity of peripheral nerves. [Methods] In 40 observed objects and patients of case group,and 48 persons of control group.the conduction velocity of peripheral nerves was examined by electromyography. [Results] The results showed that there is a significant difference in the peripheral conduction velocity in which the sensory conduction velocity is much slower and the distal latency is longer in case group ( P 0 01). [Conclusion] Manganese was harmful to not only central nerve system but also peripheral nerve system. The peripheral nerves conduction velocity can be used as a reference parameter for diagnosis of the chronic manganese intoxication.
Peripheral Nervous System
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Isonicotinic acid
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Objective To investigate the significance of determination of peripheral nerve conduction velocity of lower extremity in the earlier period diagnosis and the condition evaluation of diabetic peripheral neuropathy(DPN).Method The conduction velocities for F wave,motor and sensory nerve were measured in 53 patients with diabetes mellitus.The changes of peripheral nerve conduction velocity in diabetic patients with and without nervous systemic symptom,type 1 and type 2 diabetes mellitus were analysed.Results The conduction velocities in all observed groups were significantly slower than normal value.The conduction velocities for F wave and motor nerve in the group with nervous systemic symptom were significantly slower than that in the group without it.There was no statistical significance in the conduction velocity for sensory nerve between two groups.The peripheral nerve conduction velocities in type 1 diabetes mellitus were significantly slower than those in type 2 diatetes mellitus.Conclusions The peripheral nerve conduction velocities of lower extremity could be served as a sensitive index to diagnose DPN in the earlier period,and to evaluate its condition.
F wave
Sensory nerve
Motor nerve
Peripheral Nervous System
Diabetic Neuropathy
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F wave
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Objective The aim was to study the effect of the benzene exposure and intoxication on the conduction velocity of peripheral nerves.[Methods] 27 observation subjects and patients with bonzene poisoning as a case group and 48 normal persons as a control group were examined. The conduction velocity of peripheral nerves was examined by electromyography.[Results] The sensory conduction velocity(SCV) of ulnar nerve and peroneal nerve is much slower,and the distal latency of median nerve is also longer in case group compared with control group(P0.05). [Conclusion] Benzene is harmful to peripheral nerve system. The sensory conduction velocity(SCV) is more valuable than the motorial conduction velocity(MCV) in revealing harmful effect of benzene on poripheral nerves.
F wave
Peripheral Nervous System
Sensory nerve
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