The pre- and postoperative ENG findings in clinical otosclerosis and the late hearing results.

125 patients suffering from otosclerosis underwent oto-neurological investigations preoperatively and again daily from the second to sixth day postoperatively. An abnormal ENG in the form of a spontaneous or positional nystagmus, directional preponderance or a diminished caloric reaction could be found preoperatively in 30% of the patients. No statistically significant difference between patients with or without abnormal ENG findings could be shown in the late postoperative hearing results of 3 years in a series of different types of operations. Nearly half of the patients had postoperative nystagmus. On the second day nystagmus beat towards the operated ear in 22.3% of the patients. On the sixth day there was nystagmus only in one-third of the patients and it then beat towards towards the operated ear in only 12.1% of the patients and away from the operated ear in 12.6%. No statistically significant correlation could be found between the nystagmus findings and the late hearing results after 3 years' observation in this series of different types of operation.