For a few minutes, as the chamber pressure slowly builds up, the patient will feel a sensation in his/her ears as though they are filling up. This is normal and due to a pressure differential across the tympanic membrane, and can be relieved by “ear clearing” maneuvers that are taught by the chamber technician or nurse. On reaching the treatment pressure there is no sensation of pressure because it is evenly distributed throughout the body. The patient may hear a “crackling” noise in their ears as the pressure is reduced at the end of the treatment, this is also normal and should cause no discomfort.
Copyright Life Support Technologies Group Inc, Sept 2012