The eustachian tube is a canal that connects the middle ear to the nasopharynx (the upper throat and the back of the nasal cavity). It controls the pressure within the middle ear, making it equal with ...

Infections and blockages can disrupt the eustachian tubes, leading to discomfort and hearing problems. Any of these symptoms can count as eustachian tube dysfunction (ETD). The eustachian tube runs ...

The AT235 is an automatic middle ear analyzer and pure tone audiometer, ideal for diagnostic or screening evaluations. Attractively designed with a large tilt screen display, the AT235 comes standard ...

Test batteries of the AT235 include standard tympanometry, ispsilateral and contralateral acoustic reflex and reflex decay, Eustachian tube function test (Williams test), and air conduction audiometry ...