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Author: admin, 14.11.2015
Hearing loss may result from damage or disruption to any part of the hearing system from simple wax blocking the ear canals, through to age-related changes to the sensory cells of the cochlea, to damage to the brain. Hearing loss occurs primarily when the inner ear or auditory nerve is damaged or when sound waves cannot reach the inner ear.
Presbycusis, the loss of hearing that gradually occurs in most individuals as they grow older, is usually greater for high-pitched sounds. Another common hearing impairment, tinnitus, is commonly described as a ringing in the ears, but it also can sound like roaring, clicking, hissing, or buzzing.
In recent years, researchers have undertaken a number of successful animal studies to repair damage to the inner ear through the transplantation of stem cells obtained from umbilical cord blood. This article focuses on hearing loss in infants. Causes About 2 - 3 infants out of every 1,000 live births will have some degree of hearing loss at birth.
People with mild hearing loss may find it hard to follow speech, particularly in noisy situations.
For example, it may be difficult for someone to hear the nearby chirping of a bird or the ringing of a telephone. The sound may be soft or loud, high-pitched or low-pitched and heard in either one ear or both.
The subjects will be ten infants, aged six weeks to eighteen months, who suffered hearing loss after birth. Possible treatments include hearing aids, cochlear implants, special training, certain medicines, and surgery.

However, the same person may hear clearly the low-pitched sound of a truck rumbling down the street. Tinnitus is a symptom that something is wrong in the auditory system, which includes the ear, the auditory nerve that connects the inner ear to the brain, and the parts of the brain that process sound. Food and Drug Administration has granted approval for the first study using cord blood stem cells to treat sensorineural hearing loss in children. According to the World Health Organization, half of all cases of deafness and hearing impairment are avoidable through prevention, early diagnoses, and management.
Due to the increased survival rate of infants born prematurely, the indigence of hearing loss in young children has continued to increase. Profound hearing loss is what most people call deafness. Some cases of hearing loss are progressive (they get worse over time). Profoundly deaf people may communicate by lip-reading, and Sign Language may be their first or preferred language.
Because the process of loss is gradual, people who have presbycusis may not realize that their hearing is diminishing.
Causes of mixed hearing loss can include any combination of the above SNHL and CHL causes. Central hearing loss results from damage to the auditory nerve itself, or the brain pathways that lead to the nerve.
If they do not reach these milestones, hearing loss since infancy may be the cause. Some children may not be diagnosed until they are in school. Inattention and falling behind in class work may be the result of an undiagnosed hearing loss problem. Exams and Tests Hearing loss results in a baby's inability to hear sounds below a certain level.

A baby with normal hearing will hear sounds below that level. The health care provider will examine your child. The exam may show problems such as bone problems or signs of genetic changes that may cause hearing loss. The doctor will use an instrument called an otoscope to see inside the baby's ears. This test uses patches, called electrodes, to determine how the auditory nerve reacts to sound. Otoacoustic emissions (OAE) test. If there is no echo, it is a sign of hearing loss. Older babies and young children can be taught to respond to sounds through play. These tests, known as visual response audiometry and play audiometry, can better determine the child's range of hearing. Treatment Over 30 states in the United States now have mandatory hearing screenings of newborns. Early treatment of hearing loss can allow many infants to develop normal language skills without delay. In infants born with hearing loss, treatments should start as early as possible, preferably by 6 months of age. Treatment depends on the baby's overall health and cause of hearing loss. Advances in hearing aid technology and speech therapy allow many children to develop normal language skills at the same age as their peers with normal hearing.
Vaccinations against several types of bacteria that cause meningitis are available, and may reduce the risk of the disease in a child with a cochlear implant.

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