Hearing loss or deafness may be congenital or acquired and can be divid-ed into sensorineural (SN) or conductive loss. Hearing loss of up to 20dB tends not to affect development, but a loss of over 40dB will affect speech and language development.
• Non syndromic.
• Ushers syndrome (see Table 24.2);
• Waardenburg syndrome (see Table 24.2).
• birth asphyxia;
• congenital infection, e.g. rubella, CMV, syphilis.
• drugs, e.g. aminoglycosides;
• head injury;
• acoustic neuroma.
Ear canal atresia/stenosis.
• Acute otitis media.
• Chronic otitis media (tympanic perforation, cholesteatoma).
Secretory otitis media.