consanguineous marriage is strongly favored in many large human populations. in the most parts of south asia, consanguineous marriage account for 20%  to over 50% of the general population. the effect of consanguinity on hereditary deafness has been well studied and documented. many authors have suggested that approximately one half  of sensory neural hearing loss in children can be attributed ...

H earing impairment is a common condition responsible for communication disorders affecting one in 1000 newborns. 2 A national poll by the China Association of the Handicapped in 1987 showed that 20.57 million people in the country were affected by auditory or speech disorders, accounting for 34% of the 60 million disabled or 1.58% of the total Chinese population (1.3 billion) (www.cdpf.org.cn)...

A representative sample of 6421 Saudi children were clinically examined and screened for hearing loss. Hearing impairment was detected in 494 children (7.7 per cent). In 326 of the children it was due to chronic secretory and suppurative otitis media (5.07 per cent) and in 168 of them sensorineural hearing loss (2.6 per cent). The study revealed that parental education, low income, and employme...

introduction: newborn hearing screening leads to the early detection of hearing impairment. the aim of screening is to decrease or remove the effect of hearing impairment on development of speech and language by timely diagnosis and effective treatment. a number of risk factors lead to delayed start of decreased hearing ability including: 1. congenital infection with cytomegalovirus  (cmv) viru...

Hearing impairment may affect children's communication skills, social development, and educational achievement. Little is known about the prevalence of hearing impairment among Chinese children. Data were taken from the 2006 second China National Survey on Disability (CNSD). Hearing impairment was defined as moderate (41-60 dB HL), severe (61-80 dB HL), profound (81-90 dB HL), or complete (>91 ...

Non-syndromic hearing impairment is one of the most heterogeneous hereditary conditions, with more than 40 reported gene localisations. We have identified a large Dutch family with autosomal dominant non-syndromic sensorineural hearing impairment. In most patients, the onset of hearing impairment is in the first or second decade of life, with a slow decline in the following decades, which stops...

120 cases of iranian soldiers complaining of hearing loss, were studied over a period of three years at the ghaem medical center in mashad,iran. there was adequate information in iii cases that their engagement in different types of explosions had caused their hearing impairment. the following aspects were evaluated: 1- categorization of their hearing impairment. 2- the otoscopic findings. 3- t...

abstract   background : noise is the most common hazard in the workplace and noise induced hearing loss considered to be the most common occupational disease as well. cigarette smoking, in some studies, has been known to induce hearing loss. the purpose of this study was to evaluate the effect of contemporary exposure to occupational noise and cigarette smoking on hearing.   methods : 478 assem...