Efficacy of hyperbaric oxygen salvage therapy for sudden sensorineural hearing loss after ineffective primary treatment in the Slovak Republic.

The monitored group was divided into three subgroups according to the degree of hearing impairment.

A statistically significant improvement in auditory threshold in all three frequency bands was observed in patients with severe hearing impairment of more than 60 dB, with mean auditory gains of 14.5 dB in low frequencies, 11.2 dB in middle (spoken speech) frequencies, and 13.2 dB in high frequencies.