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Vibratory Pattern and Mucosal Wave Differences Between Children With Nodules and Vocally Healthy Children.

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This study reveals sex-specific differences in vocal fold vibration patterns in children with vocal fold nodules, impacting glottal gap and mucosal wave amplitude. High-speed videoendoscopy (HSV) aids in distinguishing healthy from pathological voice production.

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Area of Science:

  • Laryngology and Voice Science
  • Pediatric Otolaryngology
  • Biomechanical Voice Analysis

Background:

  • Vocal fold nodules are common in children, affecting voice quality.
  • Understanding the biomechanics of vocal fold vibration in pediatric nodules is crucial for diagnosis.
  • Previous research has not fully elucidated sex-specific vibratory patterns in this population.

Purpose of the Study:

  • To systematically investigate posterior glottal gaps, vibratory patterns, and mucosal wave amplitude in children with vocal fold nodules compared to healthy controls.
  • To identify sex-related differences in these parameters.
  • To explore the diagnostic utility of high-speed videoendoscopy (HSV) in pediatric voice disorders.

Main Methods:

  • High-speed videoendoscopy (HSV) was used to record sustained phonation in 20 children with vocal fold nodules (10 boys, 10 girls) and compared to controls.
  • Posterior glottal gap, mucosal wave amplitude, and anterior-posterior (AP) vibratory patterns were assessed using a custom visualization tool.
  • Statistical analysis included Pearson's chi-square and Mann-Whitney U tests to compare groups.

Main Results:

  • Girls with nodules showed more frequent posterior glottal gaps than adult male controls.
  • Boys with nodules exhibited distinct opening patterns compared to controls.
  • Children with nodules displayed different closure patterns, with sex-specific variations, particularly in girls.

Conclusions:

  • Sex and pathology significantly influence pediatric vocal fold vibration, affecting glottal gap, vibratory coordination, and mucosal wave amplitude.
  • HSV provides valuable benchmarks for visual-perceptual assessment of pediatric voice.
  • HSV demonstrates diagnostic potential in differentiating healthy pediatric voice from pathology.