Interpretation of Nystagmogram:I. Slow and Fast Phase of Nystagmus

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概要

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• Factors causing variability of the slow and fast phases of nystagmus in caloric testing are reviewed. The range of normal values is wide. This can arise from three different sources: technical variation in conducting the test, anatomical differences among temporal bones, and involvement of the central nervous system during caloric responses. A model for organization of the eye movement in vestibular testing is presented. Parameters based on the slow phase of nystagmus do not discriminate a peripheral lesion from a central lesion except for the following: (1) lack of visual suppression in light during caloric testing indicates a posterior fossa lesion and (2) decrease of slow-phase velocity in unilateral or bilateral optovestibular testing is suggestive of brain stem disorder. However, examination of the fast phase of nystagmus can provide additional information for differentiating a peripheral from a central lesion. A decrease of fast-phase velocity in caloric, optokinetic, and optovestibular testing is always a sign of central nervous system disease and frequently indicates a posterior fossa lesion.

• 耳鼻咽喉科臨床学会の論文

著者

• Pyykko I.

  Department of Otolaryngology, Faculty of Medicine, Kyoto University

• Pyykko I.

  Department of Otorhinolaryngology, University Hospital

• Henriksson N.

  Department of Otorhinolaryngology, University Hospital

• Wennmo C.

  Department of Otorhinolaryngology, University Hospital

• Hinoki M.

  Department of Otolaryngology, School of Medicine, Kyoto University

関連論文

• Interpretation of nystagmogram. II. Saccades and smooth pursuit eye movements.:II. Saccades and Smooth Pursuit Eye Movements
• Interpretation of Nystagmogram:I. Slow and Fast Phase of Nystagmus
• Dissociation in the Eye Motor Function in Brainstem Lesions

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