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Muscle fiber area distribution of musculus uvulae in obstructive sleep apnea and non-apneic snorers

Abstract

OBJECTIVE: To determine whether differences exist in the morphology of upper airway muscles between apneic and non-apneic snorers

DESIGN: Muscle characteristic analysis in patients undergoing upper airway surgery in a tertiary sleep center.

SUBJECTS: 10 non-apneic snorers and 10 sleep apnea hypopnea syndrome (SAHS).

MEASUREMENTS: Frequency distribution of musculus uvulae (MU) muscle fiber area determined from 475±207 (mean±s.d.) and 697±165 type IIA fibers and 92±32 and 68±45 type I fibers in snorers and SAHS, respectively.

RESULTS: Histochemical analyses of MU revealed as expected that type IIA fibers occupied a significantly larger area within that muscle in SAHS compared to Snorers (89.4±5.8% and 76.1±15.1% respectively, P=0.01). No difference was found in the frequency distribution of type I and type IIA fiber areas between the two groups comparing the between-groups and within-group variance of individual area distributions found in snorers and SAHS.

CONCLUSION: There is no difference in muscle fiber area frequency distribution between non-apneic snorers and SAHS patients. This suggests that musculus uvulae of these groups of patients does not have a specific prevalence of atrophic or hypertrophic muscle fibers.

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Acknowledgements

Dr JA Simoneau passed away on 27 August, 1999. The authors want to take this opportunity to testify their sincere and profound admiration to Jean-Aimé for his contribution to our outstanding collaboration, for his enthusiasm and unique dynamic approach to physiological problems as well as for his strongly positive attitude facing serious health difficulties. The authors also thank Dr Joanisse for his help in completing the revision of the manuscript. This work was supported by the Medical Research Council of Canada, grant MT 13768.

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Sériès, F., Simoneau, JA. & St Pierre, S. Muscle fiber area distribution of musculus uvulae in obstructive sleep apnea and non-apneic snorers. Int J Obes 24, 410–415 (2000). https://doi.org/10.1038/sj.ijo.0801172

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