[Therapeutic success following endolymphatic sac surgery-- postoperative course of vestibular compensation].

In recent years the benefit of endolymphatic sac surgery has been controversial. Earlier investigations were restricted to the patient's postoperative symptoms, but detailed analysis of postoperative vestibular function was not reported. Nineteen patients who had undergone endolymphatic sac surgery were followed-up for 6 months on up to 16 occasions. Twelve of the 19 patients showed continuous improvement of canal function beginning no earlier than 2 weeks after the operation. No vestibular compensation was observed after simple mastoidectomy. The postoperative symptoms were not proper indicators for successful therapy.