[Members' money. . . Background for the higher fees].
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Costs and Cost Analysis↗
Biomedical subjects
G Poulsen
Publications and source records attributed to G Poulsen.
[The medical society sets up a memorial plate to Danish-Congolese collaboration].
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Congo↗
Screening tympanometry in infants and two-year-old children.
In 150 newborn children tympanometry was repeated each third month until the age of one year. In 222 two-year-old children repetitive tympanometric screenings were performed in November, February, May and August, and the alterations in the tympanogram types were analyzed. There was found a very low stability of the tympanogram types and about 50% of the ears changed type between the investigations. The type A tympanogram (0 to -99 mm H2O) was the most stable type, only 52% of the ears changed tye. All ears with type C1 (-100 to -199 mm H2O), 97% of ears with type C2 (-200 to -350 mm H2O), and 84% of the ears with type B (flat curve) changed tympanogram type at least once at the four evaluations. This large variability in the tympanometric conditions, most often caused by a change in the frequency and severity of catarrhalia, makes the prognostic value of the screening tympanometry very small.
Acoustic Impedance Tests↗
Attic retractions following secretory otitis.
At re-examination of 527 ears with secretory otitis 3 to 8 years after tubulation otomicroscopy and tympanometry revealed different types of retraction of Shrapnell's membrane in 34%, of these 4.2% had pronounced retraction with resorption of the osseous annulus and 0.2% had atticus cholesteatoma. There was a close correlation between the frequency and severity of retraction on the one hand and the age of the patient at reexamination, the tympanometric conditions, and the pathology of pars tensa on the other. The continued progression is further promoted by a lack of natural cleansing of the retraction. As the frequency of secretory otitis is very high in children the 4.2% of pronounced retractions constitute a sufficient quantitative basis for a direct progression to atticus cholesteatoma.
Acoustic Impedance Tests↗