It has been known for some years that intra-arterial application of ATP as well as the only treatment with hyperbaric Oxygen is able to influence favorably a sudden hearing loss. In this study the combined application of both agents was used optimally. Up to now only few cases could be treated. The three above mentioned patients have shown remarkable results. A patient with a long lasting sensorineural hearing loss is especially interesting and this is the reason why we now publish the results gathered up to now.