Ear Infections - Diagnosis

Diagnosis

The doctor should be sure to ask the parent if the child has had a recent cold, flu, or other respiratory infection. If the child complains of pain or has other symptoms of otitis media, such as redness and inflammation, the doctor should rule out any other causes. These may include:

• Otitis media with effusion. OME is commonly confused with acute otitis media. OME must be ruled out because it does not respond to antibiotics.
• Dental problems (such as teething).
• Infection in the outer ear. Symptoms include pain, redness, itching, and discharge. Infection in the outer ear, however, can be confirmed by tugging the outer ear, which will produce pain. (This movement will have no significant effect if the infection is in the middle ear.)
• Foreign objects in the ear. This can be dangerous. A doctor should always check for this first when a small child indicates pain or problems in the ear.
• Viral infection can produce redness and inflammation. Such infections, however, are not treatable with antibiotics and resolve on their own.
• A parent's or child's attempts to remove earwax.
• Intense crying can cause redness and inflammation in the ear.

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Physical Examination

Instruments Used for Examining the Ear. An ear examination should be part of any routine physical examination in children, particularly because the problem is so common and may not cause symptoms.

• The doctor first removes any ear wax (called cerumen) in order to get a clear view of the middle ear.
• The doctor uses a small flashlight-like instrument called an otoscope to view the ear directly. This is the most important diagnostic step. The otoscope can reveal signs of acute otitis media, bulging eardrum, and blisters.

• To determine an ear infection, the doctor should always use a pneumatic otoscope. This device detects any reduction in eardrum motion. It has a rubber bulb attachment that the doctor presses to push air into the ear. Pressing the bulb and observing the action of the air against the eardrum allows the doctor to gauge the eardrum's movement.
• Some doctors may use tympanometry to evaluate the ear. In this case, a small probe is held to the entrance of the ear canal and forms an airtight seal. While the air pressure is varied, a sound with a fixed tone is directed at the eardrum and its energy is measured. This device can detect fluid in the middle air and also obstruction in the Eustachian tube.
• A procedure similar to tympanometry, called reflectometry, also measures reflected sound. It can detect fluid and obstruction, but does not require an airtight seal at the canal.