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Biomedical subjects

J Kopec

Publications and source records attributed to J Kopec.

At least 19 recordsLinked to original sources

Role of aggressive intracranial pressure control in management of pediatric craniocerebral gunshot wounds with unfavorable features.

During a 6-year period, 14 consecutive children with penetrating craniocerebral gunshot wounds (GSW) were studied. Eleven patients were comatose on admission. Five had an admission Glasgow Coma Scale (GCS) score of 4 or less and developed clinical signs of brain death within 12 hours despite maximum therapeutic efforts. The remaining six patients, all of whom had three or more of the previously described unfavorable prognostic features, were aggressively managed with prophylaxis and treatment of intracranial hypertension. Intracranial pressure (ICP) was controlled with mechanical hyperventilation, mannitol osmotherapy, pentobarbital, and surgical decompression. Substantial intracranial hypertension occurred for up to 10 days after admission. There were four survivors. Neurobehavioral and intellectual functions were evaluated over a period of 1 to 2 years. Although serious cognitive deficits were noted, all survivors had sufficient functional recovery to warrant aggressive cardiopulmonary resuscitation and measures to control ICP in the management of comatose victims of craniocerebral GSW.

Brain Injuries

[Computer analysis of the EMG and clinical results].

The diagnostic yield obtained by automatic analysis is reliable and is immediately available because the results are obtained on line. The diagnostic yield in a range of 80-90% was based on single mean parameter criteria. The histogram shape was analyzed by discrimination analysis and gave similar results. In clinical routine examination where only the mean values are considered using criteria of 2 parameters change gives greater confidence. 1. The method we are using offers a complex record evaluation used in quantitative electromyography and could be obtained on line. 2. It is possible to examine on many muscles and necessary for reliable diagnosis without special devices for monitoring the force of the examined muscle. 3. The mean values from 5 parameters are sufficient for clinical evaluations. 4. The obtained data could also be taken in digital form for further statistical processing.

Computers

Refractory period studies in a human neuromuscular preparation.

A subtraction technique has been employed to study refractoriness in the median nerve and thenar muscles in man. The absolutely refractory periods of the distal motor nerve branches and of the muscle fibres were found to be similar, the majority being within the 2.5--3.0 ms range; the values were distributed in a unimodal manner. The relatively refractory periods of the motor nerve terminals were about 5 ms. In some experiments it was possible to record non-propagated potentials at the endplate zones of the muscle fibres.

Adult

Effects of age, temperature, and disease on the refractoriness of human nerve and muscle.

Absolutely and relatively refractory periods have been investigated in terminal median nerve axons and in thenar muscle fibres in a variety of pathophysiological conditions. Marked increased in refractoriness were produced by cooling to 20 degrees C. Nerve fibre refractoriness was more pronounced in older subjects and diminished in myotonic dystrophy. In contrast, no significant changes in muscle fibre excitability could be demonstrated in either condition or in patients with renal failure or motor neuropathies.

Adult