Hearing loss is a common problem caused by noise, disease, aging, illness, and genetics. General signs of hearing loss occurs suddenly and develops gradually that includes asking people to repeat themselves, listening to music or television with a higher volume than required. There are two main types of hearing loss depending on where the problem lies they are conductive hearing loss, sensorineural hearing loss.
Sensorineural is caused by damage to the auditory nerve that occurs naturally with age. There are several options that help to improve a person’s ability to hear and communicate which includes digital hearing aids, cochlear implants, middle ear implants, bone anchored implants, wireless devices, etc. The 35delG mutation was detected in 11/ 712 unrelated blood donors.
The overall prevalence is 0.78 per 1000 for males and 0.69 per 1000 for females (p < 0.001). The hearing impairment prevalence differs according to region of residence (p < 0.001). The geographic distribution of prelingual deafness was found to be: North 15,644 cases (0.63 per 1000), Central Italy 7111 cases (0.64 per 1000), South and Islands 18,132 (0.87 per 1000). The prelingual hearing loss is highly prevalent in South Italy (Basilicata, Calabria and Sicily).