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At least 1,117 records · Page 62Linked to original sources
PubMed1978

The inverse Marcus Gunn phenomenon. An electromyographie contribution.

A patient with the inverse Marcus Gunn anomaly is presented. Electromyographic studies showed the salient fact that the closing of the involved eye on opposite motion of the lower jaw was not mediated by seventh nerve stimulation of the orbicularis oculi but by inhibition of the homolateral levator palpebrae superioris. As a consequence of this observation, a specific and effective operation could be planned.

Adult↗
PubMed1978

Electrophysiological study of hemiplegia. Motor nerve conduction velocity, brachial plexus latency, and electromyography.

Motor nerve conduction velocities of the ulnar and common peroneal but not the median nerves were substantially reduced in the affected limbs in a series of hemiplegic patients. Slowing of conduction velocity of the common peroneal nerve was related to the reduction of skin temperature in the hemiplegic limbs. Brachial plexus latencies to biceps and deltoid muscles were longer in the affected than in the unaffected sides in five of 12 hemiplegic patients. Electromyograms (EMGs) of limb muscles showed absence of spontaneous activity in 83% of patients. Spontaneous EMG activities in 12 of the 13 patients were related to an associated subclinical neuropathy or plexopathy in the involved limbs. Entrapment andtraction causing subclinical or clinical neuropathy or radiculopathy may be present in some hemiplegic patients.

Adult↗
PubMed1987

Cardiovascular-reflex testing and single-fiber electromyography in botulism. A longitudinal study.

Four patients with botulism were studied on admission and at different times after intoxication, using a battery of cardiovascular autonomic tests. The results were compared with clinical status and single-fiber electromyographic findings. In the early stage of intoxication, the control of heart-rate and blood-pressure responsivity was markedly impaired, as was the neuromuscular transmission. At follow-up, results of sympathetic tests normalized earlier than those of parasympathetic tests. The recovery of autonomic function was slower than that of neuromuscular transmission in three patients. Monitoring autonomic derangement in botulism adds further information on the course of the disease and may identify patients at risk for cardiac or respiratory arrest. Further clinical investigation can help in determining more precisely the autonomic sites where the toxin acts.

Adolescent↗
PubMed1987

Diagnosis of thoracic outlet syndrome. Value of sensory and motor conduction studies and quantitative electromyography.

Ten patients with wasting of hand muscles and sensory symptoms mainly in the ulnar nerve area were diagnosed as having a thoracic outlet syndrome and were operated on for it. Sensory action potentials (SAPs) from digit 5 were reduced in amplitude in eight patients and those from digit 3 in three patients, and the SAP amplitude ratio between digits 3 and 1 was decreased in five patients. Sensory and motor conduction velocity was normal in all. Quantitative electromyographic studies of ulnar and median innervated small hand muscles revealed changes compatible with chronic partial denervation in most patients. The combined findings of chronic partial denervation of the small hand muscles, decreased SAP amplitude from digit 5 and sometimes also from digit 3, and normal motor and sensory conduction velocity are compatible with a compression of the C-8 and T-1 roots or the lower trunk of the brachial plexus.

Adolescent↗