English to Portuguese Medical Medical (general)

A compression-induced impairment of the vasculature may thus be one mechanism for nerve root dysfunction because the nutrition of the nerve root will be affected. However, the nerve roots will also derive a considerable nutritional supply via diffusion from the cerebrospinal fluid. To assess the compression-induced effects on the total contribution to the nerve roots, an experiment was designed in which 3H-labeled methyl glucose was allowed to be transported to the nerve tissue in the compressed segment via both the blood vessels and the cerebrospinal fluid diffusion after systemic injection. The results showed that no compensatory mechanism from cerebrospinal fluid diffusion could be expected at the low pressure levels. On the contrary, 10 mm Hg compression was sufficient to induce a 20% to 30% reduction of the transport of methyl glucose to the nerve roots, as compared with the control.