In order to clarify the direct influence of endolymphatic sac surgery on vestibular function, changes of symptoms and positional nystagmus of 23 patients were analyzed before and after surgery.
The incidence of dizziness was highest 7 to 10 days after surgery. During the same period, positional nystagmus was the most prominent. Two months after surgery, the incidence of dizziness had decreased significantly, and positional nystagmus had disappeared in most cases.
This analysis revealed that the direct influence of endolymphatic sac surgery on vestibular function was greatest 7 to 10 days after surgery, and that it took about two months to disappear.
