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Upper airway flow characteristics of childhood obstructive sleep apnea-hypopnea syndrome

Huikun Cai1, Chang Xu2, Haoyang Xue2

  • 1Department of Mechanical and Electrical Engineering, Xiamen University, No. 4221-134, Xiangan South Road, Xiangan South District, Xiamen City, 361102, Fujian Province, China. caihuikun@xmu.edu.cn.

Scientific Reports
|May 5, 2022
PubMed

Insights

This study simulates childhood obstructive sleep apnea-hypopnea syndrome (OSAHS) upper airway flow, revealing non-laminar characteristics and the significant impact of adenoidal hypertrophy above 64% narrowing.

Area of Science:

  • Pediatric respiratory medicine
  • Computational fluid dynamics
  • Otorhinolaryngology

Background:

  • Understanding childhood obstructive sleep apnea-hypopnea syndrome (OSAHS) requires specific knowledge of pediatric upper airway morphology and flow dynamics.
  • Existing research on adult OSAHS is not directly applicable to children due to differing etiological factors.
  • Accurate diagnosis and treatment planning for pediatric OSAHS necessitate child-specific data.

Purpose of the Study:

  • To investigate the unique upper airway flow characteristics in children with OSAHS using simulation methods.
  • To analyze the influence of varying degrees of adenoidal hypertrophy on upper airway airflow.
  • To provide quantitative insights for clinical decision-making in pediatric OSAHS management.

Main Methods:

  • Computational fluid dynamics (CFD) simulations were employed to model upper airway flow.
  • Standard k-ω and Spalart-Allmaras turbulent models were utilized and validated against experimental data (approx. 20% error).
  • The impact of adenoidal hypertrophy was assessed by simulating different levels of airway narrowing.

Main Results:

  • The Reynolds number exhibited significant variation throughout the pediatric upper airway, invalidating laminar flow assumptions.
  • Adenoidal hypertrophy exceeding 64% narrowing drastically altered cross-sectional area, flow velocity, pressure drop, and volume rate.
  • A 64% narrowing threshold provides a quantitative basis for surgical intervention, correlating with the clinical '2/3rds blockage' judgment.

Conclusions:

  • Pediatric upper airway flow in OSAHS is complex and non-laminar, requiring specialized modeling.
  • Significant airway narrowing due to adenoidal hypertrophy has a profound impact on airflow dynamics.
  • These findings offer valuable guidance for surgical planning and postoperative evaluation in pediatric OSAHS.

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