What characterizes a Type A tympanogram?

A Type A tympanogram is characterized by normal middle-ear function, which is indicated by a peak pressure that is typically close to 0 daPa. This reflects that there is proper movement of the tympanic membrane (eardrum) in response to air pressure changes in the ear canal, which is essential for efficient sound transmission through the middle ear. The shape of a Type A tympanogram usually shows a distinct peak, signifying that the middle ear pressure is balanced and that there's no significant fluid behind the eardrum or other issues affecting its mobility.

The importance of recognizing a Type A tympanogram lies in its association with healthy middle ear conditions, in contrast to other types of tympanograms that indicate varying degrees of dysfunction or pathology, such as the presence of fluid (Type B) or negative pressure (Type C).