The influences of axon diameter, myelin thickness, and internodal length on the velocity of conduction of peripheral nerve action potentials are unclear. Previous studies have demonstrated a strong dependence of conduction velocity on internodal length. However, a theoretical analysis has suggested that this relationship may be lost above a nodal separation of ∼0.6 mm. Here we measured nerve co...

Nerve conduction study is an important tool to evaluate peripheral nerve abnormality. The primary purpose of this study was to provide normative electrophysiological data for commonly tested upper limb nerves in normal healthy adults. Nerve conduction studies were performed prospectively in upper limbs of 175 carefully screened healthy volunteers between the ages of 18 and 66 years using standa...

OBJECTIVE To determine an ideal stimulation site of the medial antebrachial cutaneous nerve (MACN) using ultrasound measurement and to compare the efficiency of the new stimulation site with the conventional stimulation site on the nerve conduction study. METHODS Both arms of 15 healthy participants were measured using ultrasound. The MACN was identified in the transverse view at each 0, 2, 4...

To investigate the physiological adjustments of textile workers exposed to high temperature environment, 10 workers with years of work experience and 12 students with rarely entering into workshop were chose to a hospital for blood test and nerve conduction velocity measurements. The blood test was to measure potassium content, sodium content, calcium content and bicarbonate content in particip...

Near-nerve recording of sensory action potentials evoked by electrical and tactile stimuli is a valuable tool in the assessment of nerve pathophysiology. In most instances where percutaneous recording fails to discriminate sensory potentials from noise they can be picked up by needle recording. To localize the site of focal injuries by determination of conduction across the presumed site of les...

Conduction block was detected in patients with neuropathy by measuring a decrease in the size of the compound muscle action potential of more than 20% on proximal versus distal stimulation of the peroneal, median or ulnar nerve in the absence of excess temporal dispersion of the potential. The teased fibre analyses of nerve biopsies from four patients with "definite" and six patients with "prob...

BACKGROUND Common peroneal neuropathies, usually located at the fibular head, are one of the causes of drop foot, a condition often evaluated in the electromyography laboratory. OBJECTIVES To study the motor conduction properties of the common peroneal nerve and its branches of distribution in patients with paralyzed drop foot, several weeks after their first stroke, assuming that its inversi...

A rat model of severe nerve ischemia was used to study the effects of ischemia and reperfusion on nerve conduction, blood flow, and the integrity of the blood-nerve barrier. Conduction failure was consistently found in the sciatic-tibial nerve during 1- and 3-hr ischemic periods. Recovery of the compound muscle action potential was prompt and complete upon reperfusion following 1 hr of ischemia...

By measuring the distribution of conduction velocities (DCV) in sensory fibres of the median nerve, the effects of asymptomatic increased lead, zinc, and copper absorption on the conduction velocities of slower and faster nerve fibres were examined in 29 gun metal founders with blood lead (BPb) concentrations of 22-59 (mean 39) micrograms/dl (1.1-2.8 (mean 1.9) mumol/l). The results indicated t...

Nerve conduction studies were conducted in 67 children to assess the effect of malnutrition on the peripheral nervous system. Significant reduction in nerve conduction velocities was demonstrated in severe protein energy malnutrition and ongoing long-term malnutrition.