Physiological studies have been made of extensor digitorum brevis muscles in 28 healthy subjects aged between 60 and 96. Within this elderly population there was evidence of muscle wasting and weakness. These changes were shown to result from a loss of functioning motor units. The surviving motor units were often enlarged and tended to have relatively slow twitches. In some subjects the maximum...

A case of combined multiple sclerosis and demyelinating neuropathy is presented. Percutaneous electrical stimulation of the cortex and spinal cord has shown that pyramidal tract conduction time was prolonged and conduction velocity in the cord was 4 m/s. Motor conduction velocity in proximal segments of peripheral nerves was slowed to the same extent as in distal segments.

OBJECTIVES The aim of this study was to analyze the risk factors and mid-term outcomes associated with post-procedure heart blocks (PPHBs) after transcatheter closure of perimembranous ventricular septal defect (pmVSD). BACKGROUND The development of heart blocks remains a major challenge for transcatheter closure of pmVSD. METHODS Transcatheter closure of pmVSD was carried out in 228 patien...

Unlike carpal tunnel syndrome, isolated neuropathy of the recurrent motor branch of the median nerve is a rare condition as a cause of thenar muscle wasting. A focused neurophysiological approach is mandatory to reach the proper diagnosis and start specific treatment early enough to prevent possible irreversible hand function disabilities. This is a description of 16-year-old female patient who...

INTRODUCTION We investigated the effects of demographic and physical factors on nerve conduction studies (NCS) in a multi-ethnic Asian population. METHODS One hundred sixty-six healthy Malaysians of different ethnicities (51.2% women, aged 21-77 years) underwent NCS using a standard protocol. Correlations of various factors to NCS were determined, and multiple linear regression analysis was u...

In a review of twelve cases of Friedreich's ataxia, the important criteria for early diagnosis were identified. Clinical signs included absent tendon reflexes, ataxic gait, and a positive Romberg test. Nerve conduction velocities showed absent or severely slowed sensory conduction, with normal motor conduction. In addition, echocardiographic changes of symmetrical hypertrophic cardiomyopathy we...

In a review of twelve cases of Friedreich's ataxia, the important criteria for early diagnosis were identified. Clinical signs included absent tendon reflexes, ataxic gait, and a positive Romberg test. Nerve conduction velocities showed absent or severely slowed sensory conduction, with normal motor conduction. In addition, echocardiographic changes of symmetrical hypertrophic cardiomyopathy we...

The relationship between surface myoelectric signal parameters and the level of voluntary or electrically elicited contractions was studied in 32 experiments on the tibialis anterior muscle of 22 healthy human subjects. Contractions were performed at 20 and 80% of the maximum voluntary contraction torque. Two levels of stimulation current were used, yielding, respectively, a maximum M wave and ...

We tested the hypothesis that conduction velocity of quiescent muscle fibers decreases during sustained contraction due to the activity of the active motor units in the muscle. Ten subjects trained for the identification of a target motor unit in the abductor pollicis brevis with feedback on surface EMG signals detected with a two-dimensional array of 61 electrodes. The subjects activated the t...

The aim of this work is twofold. First we focus on the complex phenomenon of electrogram fractionation, due to the presence of discontinuities in the conduction properties of the cardiac tissue in a bidomain model. Numerical simulations of paced activation may help to understand the role of the membrane ionic currents and of the changes in cellular coupling in the formation of conduction blocks...