Patulous Eustachian tube

Patulous Eustachian tube (PET) is a condition in which the Eustachian tube, which connects the middle ear to the back of the throat, remains abnormally open. The Eustachian tube plays a vital role in equalizing air pressure in the middle ear and draining fluids. In a healthy state, the tube opens and closes as needed, such as when swallowing or yawning.