Abstract
Middle-ear effusions of the mucoid type were collected from 14 children with secretory otitis media and analysed by a sensitive assay for hyaluronic acid. The concentration of the polysaccharide varied between three and 42 micrograms/g. in different patients but was in the same range in effusion material taken from the two ears of the same patient. As the hyaluronic acid concentrations were high compared to the serum levels, the results indicate that the effusion material contains a component derived from connective tissue.
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