Which tympanogram type is described as having a peak between -100 and +100 daPa with very low compliance (<0.3 ml)?

Which tympanogram type is described as having a peak between -100 and +100 daPa with very low compliance (<0.3 ml)?

• A. Type A
• B. Type B
• C. Type AD
• D. Type AS

Answer: (C)

Interpreting how peak location and the tympanometric compliance reflect middle-ear mechanics is the focus here. A peak that sits near normal pressure (between -100 and +100 daPa) with very low compliance (less than 0.3 ml) shows a stiff middle ear, yielding a shallow peak. This specific pattern is a Type AS tympanogram. It differs from Type A, which has normal mobility and higher compliance; Type AD, which has unusually high mobility; Type B, which is flat with no peak; and Type C, where the peak shifts to negative pressure indicating Eustachian tube dysfunction.

Interpreting how peak location and the tympanometric compliance reflect middle-ear mechanics is the focus here. A peak that sits near normal pressure (between -100 and +100 daPa) with very low compliance (less than 0.3 ml) shows a stiff middle ear, yielding a shallow peak. This specific pattern is a Type AS tympanogram. It differs from Type A, which has normal mobility and higher compliance; Type AD, which has unusually high mobility; Type B, which is flat with no peak; and Type C, where the peak shifts to negative pressure indicating Eustachian tube dysfunction.