Evaluating the Sequelae of Mastoidectomy for Acute Mastoiditis: A Long-Term Follow-Up Study of Mastoid Function

Background: Despite the widespread use of antibiotics, acute mastoiditis (AM) and related complications resulting from acute purulent otitis media continue to occur, predominantly in children. Although numerous studies have focused on the pathogenesis, aetiological agents, and treatment of AM, comprehensive investigations of the long-term outcomes of AM and the physiological consequences of surgical intervention in the temporal bone are lacking. Methods: Thirty patients who had undergone mastoidectomy for acute mastoiditis at a median age of 2.12 years were invited for evaluation at least five years postoperatively. The assessment included the Chronic Otitis Media Questionnaire 12, clinical examination with otomicroscopy, extended high-frequency pure-tone audiometry, distortion product otoacoustic emissions, middle ear impedance testing, and a newly developed protocol for noninvasive mastoid function measurement. Results were compared with a control group of 30 ears and with a group of 30 ears treated solely with tympanostomy for acute otitis media at risk of mastoiditis. Results: Although mean Chronic Otitis Media Questionnaire 12 scores were below 1 point, patients who had undergone mastoidectomy reported slightly greater difficulties with hearing in both quiet and noisy environments, along with an increased perception of tinnitus and unpleasant sensations around the ear. Otomicroscopy revealed minor structural changes in the test groups, which were absent from the control group. Pure-tone audiometry demonstrated approximately 10 dB higher thresholds at high and extended high frequencies, with similar findings observed in the distortion product otoacoustic emissions. Middle ear impedance testing indicated elevated stapedius reflex thresholds in the mastoidectomy group, while other parameters showed no statistically significant differences. Mastoid function testing demonstrated preserved pressure-buffering capacity but reduced thermal insulation of the vestibular organ under extreme thermal stimulation—an occurrence rarely encountered in daily life. Conclusions: In the long term, most patients recovering from acute mastoiditis exhibit only minor functional and structural sequelae, and the impact of mastoidectomy appears negligible compared with less invasive surgical interventions.