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Middle ear effusions were collected from 10 patients (14 ears) with secretory otitis media. Mucoid samples were pooled and reconstituted to various concentrations of nondialyzable solids. Viscoelasticity was studied using a magnetic microrheometer and compared with mucociliary transport rates measured on the frog palate.Results indicate that the viscoelastic properties of middle ear mucus correlate with mucociliary transport. A transport maximum was found at a 2% nondialyzable solids content. Implications relative to ineffective mucociliary transport in secretory otitis media are discussed. 0 INTRODUCTION.