Eustachian tube patency

Eustachian tube patency refers to how much the eustachian tube is open. The eustachian tube runs between the middle ear and the throat. It controls the pressure behind the eardrum and middle ear space. This helps keep the middle ear free of fluid.

The eustachian tube is normally open, or patent. However, ear infections, upper respiratory infections, or altitude changes can increase pressure in the ear. This can cause the eustachian tube to become blocked.

Ear anatomy

The ear consists of external, middle, and inner structures. The eardrum and the three tiny bones conduct sound from the eardrum to the cochlea.

Eustachian tube anatomy

The eustachian tube is the tube that runs between the middle ear and pharynx and regulates the ear pressure around the ear drum.