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A Study of the Spontaneous Course of Tympanometry Types in a Nonselected Population

Mogens Fiellau-Nikolajsen, MD; Joergen Lous, MD

Arch Otolaryngol. 1979;105(8):461-466.

Abstract
• For six months we observed all 3-year-old children showing type B or C tympanograms at a prevalence study in a geographically limited area (372 ears or 37.2% of the screened total) to study the spontaneous course of middle ear effusions. A considerable test-retest stability was found only for type B. In type C, such stability was equally rare whether the middle ear pressure was highly or only slightly negative. Conversion to type A was observed in about 70% of cases. Ears having a middle ear pressure from –100 to –199 mm H₂O almost always returned to normal. The tendency for a negative middle ear pressure or middle ear effusion to develop was the same for both sexes. Conversely, the prognosis of an effusion, once formed, differed significantly, with only girls showing a brief course. Accordingly, a sex-differentiated evaluation appears to be needed in preschool tympanometric screening, and should be included in all clinical considerations when middle ear effusion is demonstrated in young children.

(Arch Otolaryngol 105:461-466, 1979)

Author Affiliations
From the Department of Otolaryngology and Audiology, Hjoerring Hospital, Hjoerring, Denmark.

Footnotes
Accepted for publication April 1, 1978.

Reprint requests to Department of Otolaryngology and Audiology, Hjoerring Hospital, DK 9800 Hjoerring, Denmark (Dr Fiellau-Nikolajsen).

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