Tympanogram Types C and A

Tympanogram types C and A. Tympanogram types C (left) and A (right) differ in the location of their peak (on the X-axis). In the left picture, the pressure reading below -200 dPa (relative vacuum) suggests poor ventilation of the middle ear.

Picture: Aino Ruohola; Text: Aino Ruohola and Paula Tähtinen