ArticleFrontiers in neurology2025
Wideband tympanometry for evaluating middle ear function and hearing prognosis after endoscopic type I tympanoplasty.
Article in Frontiers in neurology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Objective: To investigate the value of wideband tympanometry (WBT) in assessing middle-ear function after endoscopic type I tympanoplasty, and to analyze postoperative changes in wideband absorbance (WBA), resonance frequency (RF), and air-bone gap (ABG) and their relationships with hearing recovery. Methods: Forty-four patients (44 ears) with unilateral chronic otitis media who underwent endoscopic type I tympanoplasty and completed postoperative follow-up were retrospectively enrolled as the study group. The contralateral normal ears (44 ears) of the same patients served as the control group. Independent-samples t-tests were used to compare postoperative WBA and RF between the two groups, and paired t-tests were used to compare preoperative and postoperative ABG within the study group. Spearman's rank correlation analysis was used to assess the relationships between postoperative WBA, RF, and ABG. In addition, postoperative WBA at 1000 Hz was compared between temporalis fascia and tragal perichondrium graft subgroups using independent-samples t-tests. Results: Compared with controls, the study group showed lower mean WBA across 226-8,000 Hz, with an asymmetric M-shaped pattern. Between-group differences in mean WBA were statistically significant in the mid-low (500-1,000 Hz), mid-high (1000-4,000 Hz), and high (4000-8,000 Hz) bands and were most pronounced in the 1,000-4,000 Hz band, whereas the difference in the low-frequency band (226-500 Hz) did not reach statistical significance. The mean RF was significantly lower in the study group than in the control group ( Conclusion: WBT sensitively reflects changes in the mechanical properties of the middle ear after type I tympanoplasty. Reduced WBA at mid-to-high frequencies together with decreased RF indicates increased tympanic membrane mass and reduced stiffness. The negative correlation between WBA at 1000 Hz and postoperative ABG indicates that WBA at this frequency may serve as an objective predictor of postoperative hearing prognosis, providing a quantitative basis for clinical efficacy evaluation.
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