後頭蓋窩占拠性病変における聴性脳幹反応の変化

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  • Clinical Study of Auditory Brain Stem Response in Infratentorial Space Occupying Lesions

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Auditory brain stem response (ABR), which has been recently used as an objective method for evaluation of the brain stem function, plays an important role in the neurosurgical field. However, there are only a few reports on ABR of the posterior fossa mass lesion. The analytical study of ABR in 20 cases of the posterior fossa mass lesion is reported. The most frequent changes of ABR in infratentorial space occupying lesions are the delay of the latency of Wave III, and the elongation of the interpeak latency between Wave III and V, and Wave IV and V. In the localized lesion, they show the prolonged latency of Wave I in the affected side. These results suggest that the most prominent and early effects in the infratentorial space occupying lesions appear in the upper pons and the mid brain.

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