Figure 133.2. Five common tympanograms.

Figure 133.2

Five common tympanograms. The lighter lines with a peak at 0 enclose a space that represents the range of normal middle ear system mobility and pressure. Type A: Normal tympanic membrane (TM) mobility and normal middle ear (ME) pressure. Type As: Reduced TM mobility and normal ME pressure; consistent with presence of otosclerosis. Represents stiff ME system. Type AD: Hypermobility of TM and normal ME pressure; consistent with flaccid TM or disarticulation of ossicular chain. Type B: Reduced TM mobility; consistent with presence of fluid in the middle ear space. Type C: Normal TM mobility and negative ME pressure; consistent with eusta-chian lube dysfunction.

From: Chapter 133, Audiometry

Cover of Clinical Methods
Clinical Methods: The History, Physical, and Laboratory Examinations. 3rd edition.
Walker HK, Hall WD, Hurst JW, editors.
Boston: Butterworths; 1990.
Copyright © 1990, Butterworth Publishers, a division of Reed Publishing.

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