Assessment by audiotympanometric testing: three case reports.

Tympanometric measurements are versatile and accurate when more than one type of ear disease is present. Three cases are presented where information from tympanometry beyond that derived from otological and routine audiological testing yielded accurate diagnoses. A patient with a history of middle-ear disease presented with a sensori-neural loss. Measures of static conductance correctly identified the problem as stiffness of the ossicular chain. An infant with unilateral congenital atresia and questionable hearing in her normal-appearing ear was determined to have serous otitis media by tympanometry and reflex testing. The course of the disease was monitored and reversed. A 17-year-old female suffered a basal skull fracture with a sudden conductive hearing loss. Low conductance and high impedance correctly identified loss of mobility of the ossicular chain which was confirmed surgically. These three cases illustrate the advantages of tympanometry in making rapid, accurate, objective measurements involving complex diagnoses of middle-ear function.