External ear resonance as a screening technique in children with otitis media with effusion

Abstract

External ear resonance can be quickly and accurately measured using real ear insertion gain equipment. It has been previously shown that external ear resonance characteristics are often altered by the presence of middle ear fluid. The external ear resonance characteristics of 84 children with a history of chronic middle ear disorder were determined. Results were compared to other audiological data and otological findings recorded during surgery. External ear resonance peak amplitude was significantly correlated with the presence or absence of middle ear fluid. It was found that peak amplitude of ≥24 dB was associated with only 15% of dry ears and peak amplitude of ≤22 dB associated with 79% of ears without fluid. The use of external ear resonance measures as a potential screening procedure is discussed.