title: Tympanometry in 2-year-old children. Seasonal influence on frequency of secretory otitis and tubal function.
abstract: Repetitive screening tympanometry performed in 240 healthy 2-year-old children showed that tympanometric conditions are significantly better in the summer season than in the spring or winter. A very large tendency to spontaneous normalization of the tympanogram type B was demonstrated. Only 16% of the ears that had type B at the first investigation in November had the same type in August. Simultaneous with the normalization of some ears others deteriorated, thus in November type B tympanogram was found in 12%, in February 14.6%, in May 11.3%, and in August 7.2% of all ears investigated. Due to the large variability in the tympanometric conditions which are predominantly caused by catarrhalia, 28.6% of the ears have had type B tympanogram at least once during the period from November to August, while only 1.6% have had type B at all four investigations. The large spontaneous recovery of secretory otitis, demonstrated in the present study, indicates that the child should be observed for a period before implementation of surgical treatment.
mesh_terms: D000158:Acoustic Impedance Tests; D002675:Child, Preschool; D004432:Ear, Middle / Q000503:physiopathology; D005260:Female; D006801:Humans; D008297:Male; D010033:Otitis Media / Q000209:etiology*; D010034:Otitis Media with Effusion / Q000175:diagnosis / Q000209:etiology* / Q000503:physiopathology; D012621:Seasons