![]() ![]() Of these A waves, 68 were not constantly elicitable. About half of the A waves were below 50 microV in amplitude, whereas amplitudes were higher than 120 microV in only 22 of 299 A waves. In the remaining 13 patients, on average 8 +/- 2 (mean +/- SD) A waves were present in each tibial nerve (n = 24) and 4 +/- 1 A waves in each peroneal nerve (n = 26). The patient without A waves had a severe axonal type of GBS with tetraplegia and almost complete loss of M responses following electrical stimulation of limb nerves. In 13 of 14 patients with Guillain-Barré syndrome (GBS), we observed multiple A waves in at least one limb nerve on routine electroneurographic studies within 7 days after onset of symptoms.
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