Objective To report hearing recovery at different frequencies and at different periods by review of tone audiometry data before and after surgery in patients with chronic suppurative otitis media.Methods Data from pa-tients with chronic suppurative otitis media(n=54,56 ears)admitted to the Department of Otolaryngology,First Affiliat-ed Hospital of Sun Yat-sen University,from January 2019 to August 2022,were retrospectively analyzed.All patients re-ceived mastoid CT,otoendoscopy and pure tone audiometry before surgery,and regular outpatient observation of tym-panic membrane healing and pure tone audiometry after surgery.Changes of air conduction(AC)and bone conduction(BC)thresholds and air bone gap(ABG)were analyzed.Results Changes of ABG at all frequencies after surgery were noticed(P<0.05),along with significant changes in air conduction thresholds at various postoperative time points(P<0.05).In particular,postoperative ABG changes were statistically significant at 500 Hz and 1000 Hz(P<0.05),but not at 2000 Hz(P>0.05).When artificial ossicle protheses were used during the operation,postoperative ABG showed signifi-cant differences at 500 Hz,1000 Hz and 4000 Hz(P<0.05),with significant changes in air conduction thresholds at all frequencies(P<0.05).Conclusion Postoperative hearing recovery can be variable at different frequencies in patients with chronic suppurative otitis media.Patients requiring artificial ossicle implantation tend to have worse preoperative hearing with greater ABG at 500 Hz,1000 Hz and 4000 Hz.While hearing recovery may vary along with frequency and time,overall,hearing improvement stabilizes and remains stable around 3 to 6 months after surgery.Particularly,hearing at 2000 Hz stabilizes within 1 to 2 months after surgery,while hearing improvement at 500 Hz and 1000 Hz may take 3 to 6 months.
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