FIG. 3.

The 226-Hz clinic-standard tympanometry with various volumes of silicone oil in the middle ear. The 226-Hz tympanometry did not yield type B tympanograms consistent with MEEs until the middle-ear space was nearly completely filled with fluid (1.5 mL). With 0.75 mL of fluid in the middle ear, at least 25 % of the TM is in contact with the fluid (Fig. 1). Some widening of the tympanometry curves is observed, but the tympanometry curve still resembles a type A tympanogram. At 1.25 mL of fluid in the middle ear (100 % TM area covered), the tympanometry curve still retains a small peak around 0 daPa.