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Postnatal development of eustachian tube cartilage. A study of normal and cleft palate cases
K Takasaki1, I Sando, C D Balaban
1The Elizabeth McCullough Knowles Otopathology Laboratory, Department of Otolaryngology, Division of Otopathology, University of Pittsburgh School of Medicine, Suite 153, Eye and Ear Institute Building, 203 Lothrop St., Pittsburgh, PA 15213, USA.
Insights
Infants with cleft palate (CP) show eustachian tube (ET) dysfunction. Reduced lateral lamina (LL) volume in ET cartilage of CP infants may increase otitis media risk.
Area of Science:
- Otolaryngology
- Pediatric Medicine
- Developmental Biology
Background:
- Infants with cleft palate (CP) frequently experience eustachian tube (ET) dysfunction.
- Understanding the developmental anatomy of the ET cartilage is crucial for addressing related pediatric conditions.
Purpose of the Study:
- To compare the postnatal development of ET cartilage volume in normal infants and those with CP.
- To investigate the relationship between ET cartilage dimensions and age in normal development.
- To identify potential risk factors for otitis media with effusion in infants with CP.
Main Methods:
- A comparative study using personal computer analysis of ET cartilage volume.
- Inclusion of 34 normal cases and 10 CP cases, with age stratification.
- Statistical analysis including t-tests and correlation/regression analyses to assess volume and age relationships.
Main Results:
- No significant difference in total ET cartilage volume between normal and CP infants under 1 month old.
- A significantly reduced ratio of lateral lamina (LL) to medial lamina (ML) volume (LL/ML) in CP infants under 1 month (P<0.001).
- Positive correlations between total ET cartilage volume, LL volume, ML volume, and age in normal subjects up to 20 years.
Conclusions:
- Immaturity of ET cartilage, particularly the LL, in CP infants is a potential risk factor for otitis media with effusion.
- Developmental differences in ET cartilage may underlie the higher incidence of middle ear issues in infants with CP.
- Further research into ET cartilage development could inform preventative strategies for otitis media.
Abstract:
Infants with cleft palate (CP) display eustachian tube (ET) dysfunction. This study compared the postnatal development of the volume of ET cartilage in 34 normal cases and 10 CP cases using a personal computer. In cases with age under 1 month old, the total volume of ET cartilage was 61.94+/-20.89 mm(3) (mean+/-S.D.) in 16 normal control cases and 50.07+/-24.69 mm(3) in nine CP cases (t-test, not significantly different from normal). The ratio of lateral lamina (LL) to medial lamina (ML) volume (LL/ML) was reduced significantly (t-test, P<0.001) from 0.23+/-0.07 in 16 normal control cases to 0.09+/-0.05 in nine CP cases under 1 month old. In 34 normal ET cases whose ages were under 20 years, statistically significant positive correlations were found between the total volume of ET cartilage (y1) and age (x), volume of LL (y2) and age, and volume of ML (y3) and age (P<0.01, r=0.731, 0.614, 0.719). The regression lines were y1=20.37x+95.57, y2=2.02x+15.60, and y3=18. 35x+79.97. With the result obtained from this study, it is assumed that immaturity of the ET cartilage in infants, especially that of LL of the ET cartilage in CP infants, may be a significant risk factor for developing otitis media with effusion.