Eustachian tube dysfunction or patulous eustachian tube, what's the difference?

Ear tube issues: The two terms relate to the state of the eustacian tube and the consequences of that state.The patuous description implies the eustacian tube does not open and close in a normal manner. If you station tube is not open and close it is deemed to have dysfunction. This dysfunction may result in autophony, a sensation of hearing an echo in one's head.