One way to do this is to teach patients autoinsufflation. This forces air into eustachian tubes and causes a popping sensation. Control of allergies. Air bubbles in Serous Otitis When serous fluid and air are mixed, bubbles may be evident. Serous fluid in the middle ear results from an obstructed eustachian tube.
Air is absorbed by cells lining the middle ear, resulting in a vacuum.
To recognize recurrent or persistent middle ear effusions which may cause impairment of hearing and speech. Current resistance trends suggest use of Trim-Sul as first line drug. Impedance Tympanometry Impedance tympanometry is useful in detecting persistence of fluid, as well as in following the resolution of transient fluid collections which accompany many cases. For serous otitis with retraction, the graph will shift into the negative range, indicating negative pressure. This chapter is part of a module that has a post-module examination required.