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• W1972144414 abstract "This study investigated the differential effects of graded spinal cord injury on the rat extrapyramidal motor evoked potential (exp-MEP) and pyramidal motor evoked potential (pyr-MEP) and the prognostic value of these effects in predicting postinjury motor performance in the rat model. In 20 rats subjected to graded spinal injury (10–100 g-cm), there was a differential injury threshold for ablation of exp-MEP and pyr-MEP. All peaks of the pyr-MEP were extinguished in the animals subjected to impact forces of 50 g-cm and above (n = 12). In contrast, the exp-MEP was completely abolished in only two animals at injuries of 80 g-cm or above. A residual exp-MEP response persisted in the remaining 18 animals. Motor performance was monitored in 16 additional animals for up to 1 week after spinal injury. The pyr-MEP was abolished in 100% of the rats subjected to a 50-g-cm injury (n = 7), whereas the exp-MEP persisted up to the highest impact forces (80 g-cm). Hind leg paralysis was present in the five rats where the pyr-MEP was extinguished but with persistence of the exp-MEP. An 80% reduction in the amplitude of the pyr-MEP in four animals resulted in mild ataxia with motor improvement at the end of a week. An increase or a 70% loss in pyr-MEP peak amplitude resulted in no clinical motor deficits (n = 5). These findings demonstrate that the exp-MEP and pyr-MEP are differentially affected by spinal cord injury and that an alteration in the postinjury pyr-MEP is an accurate prognosticator of motor function. These findings have significant implications for the evaluation of potential therapeutic modalities in the rat spinal injury model." @default.
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• W1972144414 date "1992-01-01" @default.
• W1972144414 modified "2023-10-11" @default.
• W1972144414 title "The Effect of Graded Spinal Cord Injury on the Extrapyramidal and Pyramidal Motor Evoked Potentials of the Rat" @default.
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• W1972144414 doi "https://doi.org/10.1227/00006123-199201000-00014" @default.
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