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Effects of ocular fixation on pendular rotation nystagmus in the upper brainstem, cerebellar and cere-bellopontine angle lesions were investigated in thirtyfour patients using a damped pendular rotation test (DPRT) apparatus.<BR>The DPRT was performed employing mental arithmetic in the dark or under ocular fixation. In upper brainstem tumors, the failure of visual suppression was observed in the DPRT as in lower brainstem tumors, which had already been reported, and nystagmus was evoked as is seen under darkness.<BR>In contrast to lower brainstem tumors in which the findings of perrotatory nystagmus as nystagmic rhythm, amplitude in the dark and auditory brainstem response (ABR) was abnormal, in upper brainstem tumors these were not pathological.<BR>In four of the five cerebellar tumors, mostly postoperative, failure of visual suppression on the DPRT was seen. In three of the four cases, the ABR was pathological and abnormal nystagmic findings on the DPRT under darkness were obtained.<BR>In spite of these findings of cerebellar tumors, further studies are needed to conclude that the cerebellum is responsible for the failure of visual suppression in cerebellar tumors. The effects of cerebellar lesions on the brainstem could best be judged from neurological and neurootological findings using the DPRT under darkness, ABR, together with optokinetic nystagmus and the eye tracking test.<BR>That the failure of visual suppressssion was seen on the DPRT in a case with small cerebellar infarction suggested the cerebellum is involved in the visual suppression.
- 一般社団法人 日本めまい平衡医学会の論文
一般社団法人 日本めまい平衡医学会 | 論文
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