Neostigmine-induced alterations in fast phase of optokinetic responses in myasthenic ocular palsies

Jing Tian, Qing Yang, Min Wei, Joseph Terdiman, Fuchuan Sun

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Pages (from-to)867-874
Number of pages8
JournalJournal of neurology
Volume249
Issue number7
DOIs
StatePublished - 2002
Externally publishedYes

Keywords

  • Fast-phase amplitude
  • Myasthenia gravis
  • Neostigmine
  • Open-loop
  • Optokinetic nystagmus

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology

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