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.