“…Working from a hypothesis of predominantly ischaemic origin of sudden SNHL, oxygen has a therapeutic advantage in that it easily diffuses across the blood–brain barrier to reach target tissues, and high concentrations are well tolerated 9 , 10 . Hyperbaric oxygen therapy has been favoured as a treatment for sudden SNHL by many otolaryngologists, and has resulted sometimes in dramatically improved hearing 7 , 11 , 12 …”