Sensorineural hearing loss in ankylosing spondylitis treated with TNF blockers

Sensorineural hearing loss (SNHL) in the uncommon disease ankylosing spondylitis (AS) has been previously reported. We analysed the relationships between AS, anti-TNF drug treatment, and SNHL. We determined pure tone thresholds in 28 consecutive patients with AS who were treated with the TNFalpha inhibitors etanercept or infliximab, or with a TNFalpha inhibitor plus methotrexate (MTX). SNHL was diagnosed in 16 patients (57.1%): 7/7 (100%) of those treated with anti-TNFalpha plus MTX, and 9/21 (43%) of those treated with anti-TNFalpha alone. We found a significant association between SNHL and treatment modality (p = 0.011) or treatment time in months (p = 0.020). The SNHL rate was significantly higher in patients treated with anti-TNFalpha plus MTX than those treated with anti-TNFalpha alone. The culpability of anti-TNF therapy was supported by the association between SNHL and treatment time, which was longer for anti-TNFalpha plus MTX than for anti-TNFalpha alone. SNHL may be due not only to AS, but also to drug-induced vasculitis of the labyrinthine artery or its cochlear branch.