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Acquired pendular oscillation after brain-stem hemorrhage.

Y Itoh1, E Sakata

  • 1Department of Neuro-otology, Saitama Medical School Hospital, Japan.

Acta Oto-Laryngologica. Supplementum
|January 1, 1989
PubMed
Summary
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Acquired pendular oscillation (APO) following brain-stem hemorrhage presents differently than that seen in multiple sclerosis. Some cases show gradual abatement, suggesting potential recovery from eye movement disorders.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Neurology

Background:

  • Acquired pendular oscillation (APO) is a rare condition affecting eye movements.
  • Previous research has linked APO to various neurological disorders.

Purpose of the Study:

  • To characterize APO in patients with brain-stem hemorrhage.
  • To compare APO characteristics with those observed in multiple sclerosis (MS).
  • To investigate potential underlying mechanisms and prognosis of APO.

Main Methods:

  • Electro-oculography was used to examine six patients with APO post-brain-stem hemorrhage.
  • Clinical observations documented the presence or absence of rhythmic palatal oscillation.
  • APO characteristics were compared between the study group and literature data for MS patients.

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Main Results:

  • APO in brain-stem hemorrhage cases showed slower frequencies and unstable amplitudes compared to MS.
  • APO in this cohort did not disappear with lid closure, unlike in MS.
  • Vertical pendular oscillation (VPO) was observed in 3 of 6 patients.
  • Some cases demonstrated gradual abatement of APO, challenging the notion of lifelong persistence.

Conclusions:

  • APO following brain-stem hemorrhage shares features with rhythmic palato-ocular myoclonus but differs from MS-associated APO.
  • Injury to the eye position integrator, influenced by the reticular formation's rhythm generator, is a potential cause of APO.
  • Impairment of the bilateral pontine paramedian reticular formation (PPRF) is associated with vertical pendular oscillation (VPO).