Journal
EUROPEAN JOURNAL OF PEDIATRICS
Volume 178, Issue 8, Pages 1185-1193Publisher
SPRINGER
DOI: 10.1007/s00431-019-03380-1
Keywords
Olfactory threshold; Odor identification; Sniffin' sticks; Chronic diseases children; Bronchial asthma; Allergic rhinosinusitis; Hypothyroidism; Diabetes mellitus type 1; Children
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Funding
- Medizinische Fakultat Carl Gustav Carus, Technische Universitat Dresden (MedDrive)
- Else Kroner-Fresenius-Stiftung
- Graduiertenakademie from the Technische Universitat Dresden
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The association between smell impairment and chronic diseases has been reported in some studies in adults. Such information is not available for chronic diseases in children. The aim of this study was to examine olfactory function of children with chronic diseases such as diabetes mellitus type 1, hypothyroidism, and bronchial asthma in combination with allergic rhinitis in comparison to healthy controls. The data were obtained from n=205 participants (104 boys, 101 girls) between the age of 6 and 17years. Seventy-eight of the participants were healthy controls, n=43 had diabetes mellitus type 1, n=50 suffer from allergic rhinitis or bronchial asthma, and 34 presented a reduced function of their thyroid in medical history. All participants underwent olfactory testing including olfactory threshold using Sniffin' Sticks and odor identification using the U-Sniff test. In addition, a depression inventory and cognitive testing using the Ravens Progressive Matrices was performed. No significant difference in olfactory function was observed for any of the chronic diseases in children in comparison to healthy controls. Further analysis showed a trend in significance for a subpopulation of children with bronchial asthma and comorbidities performed worse on the olfactory threshold test compared to patients with bronchial asthma without comorbidities. Pediatric patients suffering from chronic diseases scored higher on the depression inventory compared to healthy controls.Conclusion: In conclusion, this study demonstrates that the influence of chronic diseases (bronchial asthma, diabetes mellitus type 1 and hypothyroidism) on olfactory function in childhood, if any, seems to be insignificant. This is partly in contrast to adult patients. Further research should be conducted in a subgroup of patients with bronchial asthma, allergic rhinitis, and atopic dermatitis or other comorbidities to better understand the association of allergic diathesis and olfactory function and the putative pathogenesis of olfactory dysfunction.
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