Otitis Media
Overview
Otitis media (OM) is one of the most common infections in children. OM is inflammation of the middle ear and is usually secondary to bacterial and/or viral infection. It is a complication of eustachian tube dysfunction that occurred during an acute viral upper respiratory tract infection (URTI). The URTI causes effusion in the middle ear which can cause a secondary bacterial infection. The routine prescription of antibiotics in OM is NOT indicated. The overuse of antibiotics may contribute to increasing antimicrobial resistance. Rare complications of AOM include mastoiditis and facial nerve palsy.
Definition
Acute Otitis Media Acute inflammation of the middle ear characterised by otalgia, bulging tympanic membrane and erythema +/- perforation and otorrhoea
Otitis Media with effusion (Glue Ear): Also known as serous otitis media characterised by fluid in the middle with without symptoms or sign of acute inflammation of ear.
Recurrent Acute Otitis Media: Is three episodes of AOM within a six month period.
Suppurative Otitis Media: Persistent inflammatory process associated with a perforated tympanic membrane and pus draining from the ear.
Otitis externa: Inflammation of the outer ear canal, often due to bacterial or fungal/ yeast infection. Otitis externa may occur in isolation, or can be associated with AOM and perforation of the tympanic membrane.
Epidemiology
- 80% of children will have at least one episode of acute otitis media
- ~80% and 90% will have at least one episode of otitis media with effusion (OME) before school age
- Peak age prevalence is 6-18 months
Anatomy
Classification
- Acute Otitis Media (AOM)
- Otitis Media with Effusion (OME)
- Suppurative Otitis Media
- Recurrent AOM
Risk Factors
- Age (younger)
- Not Breastfed
- Allergies/Atopy
- Craniofacial abnormalities
- Exposure to environmental smoke or other respiratory irritants
- Family history of recurrent acute otitis media
- Immunodeficiency
- Exposure to group day care
- Upper respiratory tract infections
- Pacifier use
Signs and Symptoms
A child with otitis media can also have serious bacterial infection such as septicaemia or meningitis. If systemically unwell, consider coexistent causes of sepsis.
Acute Otitis Media – Acute inflammation of the middle ear
- There may be associated signs of URTI
- Fever
- Hearing loss
- Ear Pain (otalgia)
- If the ear drum perforates, discharge develops and the pain usually subsides
- Otoscope examination: Bulging, dull and opaque Tympanic membrane (TM). TM colour varies but is characteristically yellow-grey.
Otitis Media with effusion – Also known as serous otitis media characterised by fluid in the middle with without symptoms or sign of acute inflammation of ear. Can be discovered during routine audiometric screening.
- Impaired hearing
- Learning difficulties
- Inattentiveness
- Recurrent earaches
- Otoscope examination: lustreless immobile tympanic membrane. Sometimes fluid levels can be seen in the middle ear.
Chronic suppurative otitis media
- Perforated eardrum
- Mucopurulent discharge
Differential Diagnosis
Investigation
Bedside
- Pneumatic otoscopy
Other
- Swab for culture
- Audiogram
Aetiology
- Viral (25%)
- Streptococcus pneumoniae (35%)
- Non-typable strains of Haemophilus influenzae (25%)
- Moraxella catarrhalis (15%)
Pathophysiology
Chronic suppurative otitis media is a common cause of hearing impairment, disability, and poor scholastic performance. Occasionally it can lead to fatal intracranial infections and acute mastoiditis, especially in developing countries.
Management
Acute Otitis Media (AOM)
Children diagnosed with AOM should not routinely be prescribed antibiotics. Exceptions exist for high risk groups and persistent infection.
- Paracetamol or ibuprofen for pain
- Topical analgesia
- Delaye prescription of antibiotics for symptoms persisting 24-48 hours
- Patient education
Children with AOM should not be prescribed decongestants or antihistamines.
Otitis Media with Effusion (OME)
- Usually resolve within three months without treatment
- If not resolved surgery – grommets
Tympanostomy tubes (grommets) help fluid drain from the middle ear by decreasing pressure in the middle ear. Fluid also can flow into the nose via eustachian tube.
| Refer to ENT specialist |
| OME for three months or more with evidence of hearing loss or retraction of the tympanic membrane. |
| Recurrent AOM |
| Serious complications of AOM such as mastoiditis or facial nerve paralysis |
| Patients with a high risk of OME, such as those with craniofacial abnormalities e.g. Down syndrome and cleft palate |
| Discharge with cholesteatoma or chronic suppurative otitis media |
Complication
- Perforated Ear drum
- Febrile convulsions (related with OM)
- Intratemporal otitis media
- Mastoiditis
- Labyrinthitis
- Facial nerve palsy
- Intracranial otitis media
- Extradural abscess
- Meningitis
- Lateral sinus thrombosis
- Temporal lobe abscess
- Cerebellar abscess
Mastoiditis Osteomyelitis of the mastoid bone (mastoiditis) is a complication of AOM. Characterised by post auricular swelling and redness. Computed Tomography (CT) scan shows bony destruction of mastoid air cells.
Suppartive Otitis Media
Chronic suppurative otitis media is persistent inflammation of the middle ear or mastoid cavity. Synonyms include chronic otitis media, chronic mastoiditis, and chronic tympanomastoiditis. Chronic suppurative otitis media is characterized by recurrent or persistent ear discharge (otorrhea) over two to six weeks through a perforation of the tympanic membrane. Chronic suppurative otitis media usually begins as a complication of persistent AOM with perforation in childhood. Typical findings may also include thickened granular middle ear mucosa and mucosal polyps. Occasionally, chronic suppurative otitis media will be associated with a cholesteatoma within the middle ear. Chronic suppurative otitis media is differentiated from chronic otitis media with effusion, in which there is an intact tympanic membrane with fluid in the middle ear but no active infection. Chronic suppurative otitis media does not include chronic perforations of the eardrum that are dry, or that only occasionally produce discharge, and have no signs of active infection.
Cholesteatoma
Overview
Cholesteatoma is a locally destructive lesion of the middle ear, in the form of a cyst of keratinous epithelium. Cholesteatoma can occasionally lead to serious consequences, including facial palsy, meningitis, or brain abscess. It should be suspected in any case of persistent or recurrent ear discharge. The key to diagnosis is a characteristic appearance on otoscopy.
Clinical features
- Hearing loss
- Otorrhoea
- Otalgia
- Vertigo
- Tinnitus
Investigation
- CT/MRI – to see extent of the mass
- Audiogram
Pathophysiology
Aetiology is debated, but cholesteatoma probably arises from the lateral epithelium of the tympanic membrane, and then grows as a self perpetuating mass into the middle ear.
Complications
Remember it is a growing mass.
- Local tissue destruction
- Hearing loss
- Erode into the inner ear causing sensorineural hearing loss or vertigo
- Facial palsy from damage to the facial nerve as it traverses the middle ear
- Lead to spread of infection through the tegmen (roof) of the middle ear causing meningitis or intracranial abscess
References
Bhutta, MF. (2011). Cholesteatoma. British Medical Journal
Discussion