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07.04.2015
Objective: To determine the frequency and causes of hearing impairment in patients attending the out patient department of Civil Hospital Karachi. Methods: This study was carried out at the ENT department of Civil Hospital Karachi from January 1998 to October 2000. Results: Frequency of conductive hearing loss was 50%, sensorineural hearing loss 20% and mixed hearing loss in 30%.
Hearing is the function of the ear which receives the sound by external ear and transmits it to the cochlea in the inner ear via middle ear acoustic impedence matching system. The task of Cochlea is to analyze the environmental sounds and transmit the result of that analysis to the brain.1 Any pathology in this system will cause deafness or hearing impairment, which may be conductive, sensorineural or mixed. Childhood deafness is the hidden disability and leads to poor education and employments prospects.3 So, Scientific Epidemiological data is the key for preventive strategic planning.
The aim of this study was to identify the frequency and causative factors of hearing impairment and deafness in a tertiary care hospital, a major problem affecting the population resulting in communication and psychiatric problems in society.
Six hundred patients of all age groups were randomly selected in the tertiary care teaching hospital i.e. As at the time of the study there was no Ethical Review Board in Dow University, an approval could not be obtained.
Incidence of conductive hearing loss in this study was 50% [300] out of which 65%[195] were unilateral and 35%[105] were bilateral. In conductive type of hearing loss discharging ear remains the most common cause in this study. Hearing impairment is a multi factorial disease and it is very difficult to find out the exact cause. In conductive type of hearing loss Chronic Suppurative Otitis Media (CSOM) is the commonest cause in this study. In this study, the second common cause of conductive hearing loss was secretary otitis media in 57 cases (19%). This journal is a member of and subscribes to the principles of the Committee on Publication Ethics. It is a commonly accepted fact that we are living in an increasingly noisy world and damage to hearing due to over exposure to noise is becoming more and more commonplace.
Some common causes of conductive hearing loss include outer ear infection, middle ear infection and perforation (hole) in the ear drum. Most cases of hearing loss stem from damage to the inner ear, where tiny hair cells turn sound vibrations into impulses that nerve cells then carry to the brain. Speech is intimately related to hearing as patients with impaired hearing or deafness develop speech problems and the result is poor communication between patient and environment.


General information is given on Paedoaudiology for both parents and professionals.4 It evaluates the size and extent of the problem, which helps in planning for prevention. This study will highlight this problem so the measure may be taken for prevention and rehabilitation. Sensorineural type of hearing loss was found to be 20% [120] of which 87% [104] were bilateral and 13% [16] were unilateral.
Before the dawn of civilization, the primitive man used such tools of communication as drawing pictures, patterns, a shriek, a yell, a shout etc to draw attention or convey a message.
Hearing impairment and deafness are a common problem in our country because 52% of our population lives below the poverty line and only 38% have access to clean water and proper sanitation. However, etiology of hearing loss was estimated as genetic, congenital non-genetic, delayed onset non-genetic and unknown.8 Identification of causative factors, timely eradication of disease and rehabilitation of the effected persons are the milestones of prevention. According to Tantany AC, Hypoxia is the most common cause of sensorineural hearing loss in the perinatal stage.18 Noise is the commonest cause of preventable hearing loss.
Causes of childhood deafness in Pukhtoonkhwa Province of Pakistan and the role of consanguinity. Prevalence and etiology of bilateral sensorineural hearing impairment in a Finnish childhood population. The ciliary beat frequency of middle ear mucosa in children with chronic secretory otitis media.
Causes of deafness in British Bangladeshi children: a prevalence twice that of the UK population cannot be accounted for by consanguinity alone.
This is where the hearing has become damaged as a result of hair cell damage in the nerve (known as the Cochlea) often caused by general wear and tear.
This happens when a problem occurs with either the ear drum, such as a perforation, or difficulty with the area between the ear drum and the nerve (known as the middle ear) such as pressure build up, Glue Ear or similar. The type of hearing loss a person has depends on where the problem is located within the auditory pathway. The ear itself (which is also called the pinna), ear canal, and eardrum make up the portion of the pathway called the outer ear. Sensorineural hearing loss can be the result of inner ear infection, noise induced damage to the cochlea or loss due to aging (presbycusis). The most common causes of that damage are aging and chronic exposure to loud noises.A family history of severe hearing loss could signal that you’re at increased risk.
Patients of all age groups and both genders were included, who complained of hearing impairment in one or both ears. In majority of cases of sensorineural hearing loss, prenatal and perinatal factors predominate.


Profound hearing impairment is more prevalent in countries where consanguineous marriages are common such as Pakistan.3No definite epidemiological figures are available in Pakistan.
The prevalence of hearing impairment is estimated to about 440 million people world wide, While Griffith K. Typically, this type of hearing loss is apparent with 1 in 4 adults as we get older and will tend to effect high frequency sounds such as beginning and endings of words, female and children’s speech and certain types of music.
With this type of loss, the nerve is working correctly but there is a problem with the sound getting to it.
This type of hearing loss is certainly more rare and can sometimes require further investigation. The middle ear is composed of three tiny bones: the incus, malleus and stapes (also called the anvil, hammer, and stirrup). Consanguinity was the most frequent factor in this study in sensorineural type of hearing loss. Prevention of prenatal and postnatal factors can decrease the frequency of sensorineural hearing loss. However, it is estimated that prevalence of the disease is near about 10% of the population in our country.
The criteria of patient selection was hearing loss for 01 month duration or more, in one or both ears, to exclude the psychogenic and malingerer. Hypoxia, low birth weight and kernicterus can be prevented by good obstetric services while infection like mumps, measles, and meningitis can be prevented by immunization. Infection including intrauterine infection, neonatal and childhood infection is the commonest cause of SNHL. It is important to remember, whatever the results of your hearing test show, we are usually able to help people regain the hearing they have not been enjoying, often for many years.
The inner ear is made up of the cochlea (the snail shaped structure) and the nerves that go up to the brain. The most common and easily treated form of conductive hearing loss is a large buildup of waxy secretion in the ear canal.
Hearing loss is classified as conductive if the problem is somewhere in the outer or middle ear pathway. Patients who complained of hearing impairment and did not have any positive clnical or audiological sign were excluded from the study.



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Comments Most common cause of conductive hearing loss xbox

  1. Drakon
    Include episodes of vertigo, common migraine the hearing.
  2. STOUN
    Sound enrichment have an important part to play.