The results of treating 86 patients with sudden deafness are reviewed in this paper. They were treated with intravenous ATP-2Na, Vitamin B1, B6, B12 and C, stellate ganglion block, peroral steroids, cyclandelate and Kallidinogenase. Fifty-one of 86 patients were additionally treated with carbon dioxide and oxygen inhalation. The first 35 patients (no gas inhalation group) and the latter 51 patients (gas inhalation group) were compared with each other concerning hearing improvement, and recovery rate associated with age of the patients, untreated period and effect of steroids. There was no statistical difference between the two groups with regard to these parameters.