Resumo

HERNANDEZ HERNANDEZ, Bárbara Aymeé. Alteration of the electrophysiological studies of the acute axonal form of Guillain-Barré syndrome. Rev Cubana Invest Bioméd [online]. 2004, vol.23, n.1, pp.31-37. ISSN 0864-0300.

3 patients with clinical and laboratory diagnosis of Guillain-Barré syndrome with 3 months of evolution and whose course and evolution made us suspect a sensitive-motor acute axonal form were studied. A nervous motor conduction study by segments of the median, cubital, deep peroneal and posterior tibial nerves was conducted. A sensitive conduction study of the median, cubital and sural nerves, as well as the F wave of the median and posterior tibial nerves and electromyography of the most affected muscles were performed. It was proved through the conduction study that there was a reduction of the amplitude of the composed potential of muscular action and of the sensitive nervous potential without partial conduction block, or alteration of the nervous conduction velocity. Absence of F wave, signs of denervation in the electromyogram, and a neurogenic pattern were also observed. These results are compatible with the axonal degeneration of polyneuroradicular distribution. This way, the diagnosis of the acute axonal form of Guillain-Barré syndrome was confirmed and the prognosis of these cases was predicted

Palavras-chave : GUILLAIN-BARRE SYNDROME [diagnosis]; ELECTROPHYSIOLOGY; ELECTROMYOGRAPHY.