Abstract.
Closed-loop and open-loop optokinetic nystagmus (OKN) eye movements were recorded with an electromagnetic scleral search coil in 16 patients with myasthenic ocular palsies, 8 patients with nonmyasthenic ocular palsies, and 4 normal controls. We calculated the summation of fast-phase amplitude per second (SFPAps), mean of fast-phase amplitude (MFPA) and mean of fast-phase peak velocity (MFPV) of OKN before and after administration of neostigmine. Under open-loop conditions, the myasthenic patients group demonstrated distinct increases in three parameters: SFPAps (P < 0.000001), MFPA (P < 0.001) and MFPV (P < 0.001) following neostigmine injection, and the increase in SFPAps was greater than those of MFPA and MFPV (P < 0.02), while the other two groups showed no significant increases. Under closed-loop condition, only five of the myasthenic patients showed significant changes. These results suggest that the change in SFPAps during open-loop OKN before and after neostigmine administration was a specific measurement that differentiated patients with myasthenic ocular palsies from the other groups.
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Received: 16 June 2001, Received in revised form: 3 January 2002, Accepted: 14 January 2002
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Tian, J., Yang, Q., Wei, M. et al. Neostigmine-induced alterations in fast phase of optokinetic responses in myasthenic ocular palsies. J Neurol 249, 867–874 (2002). https://doi.org/10.1007/s00415-002-0750-0
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DOI: https://doi.org/10.1007/s00415-002-0750-0