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Posterior Airway Space in Adenoid Hypertrophy: Link to Acoustic Impedance Test Findings

Xiong Qian1, Kai Chen1, Yongcai Weng2

  • 1Department of Pediatrics, Jiaxing Hospital of Traditional Chinese Medicine, China.

Ear, Nose, & Throat Journal
|May 25, 2026
PubMed

Insights

Smaller posterior airway space (PAS) in children with adenoid hypertrophy correlates with increased middle ear dysfunction. Acoustic impedance testing reveals significant impedance index changes, aiding clinical assessment.

Area of Science:

  • Otolaryngology
  • Pediatric Health
  • Diagnostic Imaging

Background:

  • Adenoid hypertrophy is common in children and can lead to various complications.
  • Posterior airway space (PAS) narrowing is a key indicator of adenoid hypertrophy severity.
  • Middle ear dysfunction is a frequent comorbidity associated with adenoid hypertrophy.

Purpose of the Study:

  • To investigate the relationship between posterior airway space (PAS) measurements and acoustic impedance test results in children with adenoid hypertrophy.
  • To establish a correlation between the degree of adenoid hypertrophy, assessed by PAS, and indicators of middle ear dysfunction.
  • To provide a clinical reference for evaluating middle ear issues in pediatric patients with adenoid hypertrophy.

Main Methods:

  • Retrospective analysis of 160 children diagnosed with adenoid hypertrophy.
  • Children were categorized into four grades based on PAS values.
  • Acoustic impedance testing was performed to assess middle ear pressure, compliance, and tympanogram type; ROC curve analysis was utilized.

Main Results:

  • A significant correlation was observed between PAS grade and middle ear impedance indices.
  • As PAS values decreased (indicating more severe hypertrophy), middle ear pressure increased, compliance decreased, and the incidence of Type B and C tympanograms rose.
  • Receiver operating characteristic (ROC) curve analysis showed diagnostic value for Type B and C tympanograms (AUCs 0.654 and 0.650, respectively).

Conclusions:

  • Posterior airway space (PAS) is significantly correlated with acoustic impedance test results.
  • A smaller PAS, indicative of more severe adenoid hypertrophy, is associated with more pronounced middle ear dysfunction.
  • Acoustic impedance testing, particularly tympanogram patterns, can help assess middle ear status in children with adenoid hypertrophy.
Abstract

Keywords:
adenoid hypertrophycompliancemiddle ear pressureposterior airway space

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