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1993 Fiscal Year Final Research Report Summary

Mechanisms of vestibular symptons in perilymph fistula

Research Project

Project/Area Number 04454436
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Ophthalmology
Research InstitutionShowa University

Principal Investigator

NOMURA Yasuya  Showa University Medicine Professor, 医学部, 教授 (30009948)

Co-Investigator(Kenkyū-buntansha) SAKIKAWA Yasuhiko  Showa University Medicine Assistant, 医学部, 助手 (00205791)
KOBAYASHI Hitome  Showa University Medicine Assistant Professor, 医学部, 講師 (20234841)
Project Period (FY) 1992 – 1993
Keywordsperilymph fistula / computer graphics / utricle / animal model / semicercular ducts / dizziness / membrana limitans / pathology
Research Abstract

Lack of human temporal bone studies on perilymph fistula gives un little information on pathophysiology of dizziness.
Two animal models of perilymph fistula are created in guinea pigs. Injection method is to inject artificial perilymph into the subarachnoid space until the round window ruptures. Suction method is to suction 4 mul of perilymph from the scala tympani of the basal turn through the round window. In celloidin specimens, these methods result in identical changes in the labyrinth. Those are collapse, hydrops and rupture. The utricle and semicircular ducts show only collapse.
There is the trabecular mesh around the membranous labyrinth in the pars superior. However, this is completely missing in specimens showing moderate and severe collapse. Strange enough is that the membrane limitans is preserved. There is no rupture in the collapsed utricular and ampullary wall, instead it is found in Reissner's membrane.
In these experiments, pressure of the perilymph rises suddenly and decreases immediately after the round window ruptures. This drastic change of perilymph pressure breaks Reissner's membrane and the endolymph is withdrawn. The endolymph in the pars superior movessimultaneously, resulting in collapse of the utricle and semicircular ducts.
Even 2 months after the experiment, sensory cells of the utricle and semicircular ducts are intact. Collapsed ampullary wall is lying on the crista. In the macula utriculi, the collapse occurs in the pars interna of the macula.
Collapsed utricular wall may sway when the perilymph moves. This produces shearing motion to the otolithic membrane and the senory cells. This may explain long-lasting dizziness inpatients with perilymph fistula.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] Nomura Y,Hara M,Young Y-H,Okuno T: "Inner ear morphology of experimental perilymphatic fistula" Am J Otol. 1. 32-37 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nomura Y,Okuno T,Hara M,Young Y-H: "“Floating"labyrinth-pathophysiology and treatment of perilymph fistula-" Acta Otolaryngol. 112. 186-191 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Young Y-H,Nomura Y,Hara M: "Caloric irregularity in experimentally induced perilymphatic fistula" Ear Arch Otorhinolaryngol. 249. 181-184 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Young Y-H,Nomura Y,Hara M: "Vestiblar pathophysiologic changes in experimental perilymphatic fistula" Ann Otol Rhinol Laryngol. 101. 612-616 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nomura Y, Hara M, Young Y-H, Okuno T: "Inner ear morphology of experimental perilymphatic fistula" Am J Otol. 1. 32-37 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nomura Y,Okuno T, Hara M, Young Y-H: ""Floating"labyrinth - pathophysiology and treatment of perilymph fistula-" Acta Otolaryngol. 112. 186-191 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Young Y-H, Nomura Y, Hara M: "Caloric irregularity in experimentally induced perilymphatic fistula" Ear Arch Otorhinolaryngol. 249. 181-184 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Young Y-H, Nomura Y, Hara M: "Vestiblar pathophysiologic changes in experimental perilymphatic fistula" Ann Otol Rhinol Laryngol. 101. 612-616 (1992)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1995-03-27  

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