A diver may experience the Middle Ear Oxygen Absorption Syndrome following a long dive using oxygen.
Prerequisites:
(1) prolonged oxygen dive
(2) blockage of the Eustachian tube
If the Eustachian tube is blocked, then a negative pressure (relative vacuum) may develop as oxygen is absorbed across the mucosa of the middle ear during sleep.
Clinical findings on the morning after the dive affecting one or both ears:
(1) discomfort or sense of pressure
(2) hearing loss
(3) cracking sensation
Physical examination may show fluid in the middle ear.
Relief is usually achieved by opening the Eustachian tube so that the pressure in the middle eaer can normalize. This can be achieved with:
(1) a Valsalva maneuver
(2) yawning
(3) swallowing
(4) use of a decongestant if congestion is suspected
If symptoms are severe or persistent then the diver may need to be evaluated.
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