The ear disorder chronic secretory otitis media may be treated surgically by inserting a small plastic tube, called a grommet, into the eardrum. This tube ventilates the middle ear and allows fluid to drain away. After insertion of the grommet, hearing in the affected ear usually returns to normal, often within a few days. In most cases, the operation is performed on both ears under general anaesthesia as day surgery.
From the 2010 revision of the Complete Home Medical Guide © Dorling Kindersley Limited.