Vibrations of 60 Hz and 100 Hz were applied on the mastoid of healthy subjects, patients with unilateral peripheral vestibular lesions, with central lesions of different localizations, and patients with benign paroxysmal positioning vertigo (BPPV). In patients with unilateral peripheral deficit a horizontal nystagmus with a small torsional component beating generally to the not affected side could be observed. This nystagmus did not show adaptation during 40 s. The occurrence was more frequent using 60-Hz stimulations. This vibration-induced nystagmus did never occur in healthy subjects, seldom in patients with central vertigo, and only exceptionally in patients with BPPV. It is concluded that the finding of a vibration-induced nystagmus reflects a side difference of peripheral vestibular excitability.

Humans↗

PubMedDate not supplied

[Surgery of acoustic tumors by the retro-sigmoid route. A personal technique. Results on audition and the facial nerve (61 cases) (author's transl)].

In the surgery of acoustic tumors it is possible to preserve audition and, indeed, imperative, if the neuroma is bilateral. In this work, we describe our technique by the retro-sigmoid route which allowed us to preserve hearing in 36% of cases and facial motor movements in 82% of cases (61 operations).

Facial Nerve Injuries↗