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Author: admin | 23.06.2014 | Category: Ringing Of The Ears Treatment

Maria Fernanda Capoani Garcia Mondelli1, Regina Tangerino de Souza Jacob1, Juliana Pontalti Ribeiro2, Maria da Gloria Furlani de Mendonca Felici3, Rita de Cassia Pires Sanches3. INTRODUCTION A unilateral hearing loss may be responsible for academic difficulties, speech or language difficulties and social-emotional (1), is characterized by decreased hearing in one ear and occurs predominantly in males (2).
Unilateral Hearing Loss: the Benefit of Auditory Localization after Adaptation of Hearing Aids Individual.
Objective: To evaluate the benefit on the location after hearing the adaptation of hearing aids Individual (HA) in individuals with unilateral hearing loss.
One study (3) was identified as major causes mumps, ototoxicity, meningitis, PAIR, chickenpox, head trauma and unilateral hearing loss of unclear cause. The aplasia of the cochlear nerve was considered the main cause of unilateral hearing loss in a retrospective study of 480 children at a hospital in Philadelphia (4). Recent data demonstrate the occurrence of a unilateral hearing loss for every 1000 live births (5). Conclusion:Benefits were obtained with the use of hearing aids on the auditory localization in subjects with unilateral hearing loss, emphasizing the importance of the use of amplification. The effects of unilateral hearing loss are smaller than those caused by bilateral loss, however, in the presence of environmental noise individuals are more difficult than the normal listeners to understand speech, even when the ear is better positioned toward the talks.
The location is affected because individuals with unilateral hearing loss do not have the benefit of interaural time: when a sound comes from one direction, the time difference and interaural phase differences of continuous sounds in both ears allows the individual to determine which direction the sound is coming. The location favors the individual's sense of security within your environment for mobility and communication; there may be situations where the individual takes to locate the speaker, thereby losing the message (7).
Humans are able to distinguish one sound source that has only two degrees of difference from the horizontal plane and if it is located in front. For continuous sounds, the biggest clue to the location of the signal horizontal (right - left), frequencies below 1500 Hz is the interaural time difference, presented in both ears, while the biggest clue to the high frequencies is the difference interaural intensity and spectral cues (8). The hearing abilities for the perception and organization of the auditory environment depend in part on the use of both ears and the result of interactions that occur between neural signals and progress through binaural auditory pathway (9). A person with unilateral hearing loss has difficulty understanding speech in noise due to reduced binaural benefit: normal hearing in both ears helps the detection and organization of speech in noise (10,11). Individuals with difficulty in locating the sound source have lower speech recognition in noise environments with competition increasing in them the sense of confusion and loss of concentration (12). The problems caused by sensory deprivation can be minimized with the use of hearing aids Individual (HA), which allows the rescue of the perception of speech sounds, beyond the environmental sounds, promoting improvement of communication skills (13). This study aims to examine the benefit of hearing about the location during activities of daily living in individuals with unilateral hearing loss from mild to profound fitted with hearing aids Individual (HA).


This cohort study contemporary cross-sectional was conducted with 31 adults aged between 18 and 75 years and both genders (19 males and 12 females). The data were collected to be identified as age, type and degree of hearing loss, fitting time and daily use of hearing aids (Annex 1). To evaluate the location of the sound source in daily activities, we used the Portuguese version of the questionnaire validated by RUSCETTA et al. The subjects answered a questionnaire on the day that would be adapted to hearing aids, ie without previous experience in the use of amplification and after the minimum period of six months with the effective use of hearing aids the second session of the questionnaire. To perform the statistical study sample was divided into two groups and the G1 made by individuals with hearing loss and sensory neural aged 44-75 years, and G2 comprised of individuals with AD and mixed conductive and age group 18-43 years (Table 1). The non-parametric test of Kruskal-Wallis (15) aims to detect whether two or more independent samples are from the same population or different populations. Table 1 was applied to detect a possible difference in assessing the benefit to hearing aid use for the variables: age, type and degree of hearing loss, fitting time and daily use of hearing aids. It was adopted minimum level of significance of 10% (p In Table 2 are distributed to the averages of responses obtained in the questionnaire according to the type and degree of hearing loss, fitting time and daily use of hearing aids and age of individuals.
From the sign test was found statistically significant difference (significance level less than 1%) for the results obtained in the questionnaire on the auditory localization with and without hearing aids.
The Kruskal-Wallis test (Table 3) indicated no significant difference in benefit for the auditory localization between G1 and G2 (Tables 1 and 2) according to the variables age, type of hearing loss, hearing loss, time the fitting of hearing aids and daily use of hearing aids. DISCUSSION Whereas individuals with the same audiometric profile have different perceptions of their problem and that the traditional audiometric tests provide only basic information about the hearing abilities of the individual, it - is essential to assess the difficulties of communication, location, social and emotional disabilities hearing through the use of questionnaires (16). From these data we can observe that the difficulty increases as the hearing sensitivity worsens. The difference in time of reception of sound by two ears is what makes the first stimulated ear indicating the direction of the sound source.
Thus, a sound that originates, for example, the right of a listener first come to the right ear, which is closer to the sound source and, after a brief interval, reach the left ear, which is farther away (17) . As the results, you can see the benefit with the use of hearing aids for auditory localization in accordance with the time of use and adaptation of the device, thus the sensitivity of subjective measures, such as questionnaires, examining the progressive improvement of listening skills, among them, the auditory localization in the period that follows the adaptation of hearing aids it is important. In a retrospective survey questionnaires given to parents of 20 children with unilateral hearing loss tailored to HA were observed at 72% of positive responses regarding the benefit of it specifically related to hearing ability in different environments (18). Researchers performed an evaluation of the benefit of amplification in 29 individuals with unilateral hearing loss by means of questionnaires Abbreviated Profile of Hearing Aid Benefit (APHAB), Glasgow Hearing Aid Benefit Profile (GHABP), International Outcome Inventory for Hearing Aids (IOI-HA) and Single-Sided Deafness Questionnaire. Improvement was observed in the localization of sounds after adjusting the sound amplification device demonstrating the minimization of the head shadow effect.


According to the questionnaires used, after a year of monitoring individuals were satisfied with the amplification (19). Researchers who scored the biggest success of treatment of 57 subjects with unilateral hearing loss with communication difficulties were related to higher early intervention (surgery or amplification) (20). Because the binaural hearing is a process, the brain, through the comparison of the two auditory inputs can solve acoustic complexities, determine the direction of sound and perfect a relevant signal in the presence of other sounds and noises (21). According to the results we see that 61% of the sample made effective use of hearing aids, using the same for more than eight hours daily and 39% 2-8 hours per day, thus suggesting that the possibility of binaural hearing and consequently the ease of sound location was significant in this population. Thus, there is the importance of using these questionnaires, which makes it possible to investigate the patient's perception about the difficulties of communication, helping to monitor over time and identifying the real auditory needs beyond those possible to be observed in the audiological assessment of routine (22,23). Finally, the findings of this study showed the importance of research of the difficulties imposed by unilateral hearing loss and rehabilitation benefits in these cases with the use of amplification.
The emergence of neonatal screening programs and early detection of infants with this type of hearing loss that were previously neglected become imperative that professionals are prepared for appropriate monitoring and intervention (24). Mean of scores on the questionnaire, with and without HA, according to the hearing loss degree.CONCLUSION Benefits were observed on the auditory localization during activities of daily living with use of hearing aids, and revealed that there was variability according to the type and degree of hearing loss, duration of daily use and adaptation time of the hearing aid. Amplification considerations for children with minimal or mild bilateral hearing loss and unilateral hearing loss. Prevalence and etiology of unilateral ensoryneural hearing imparirment in finnish childhood population.
Avaliacao vestibular na perda auditiva sensorioneural unilateral: estudo vecto-electronistagmografico.
Factors influencing the masking level difference in cochler hearing impaired and normal hearing listeners. Avaliacao do grau de satisfacao entre os usuarios de amplificacao de tecnologia analogica e digital. Bone- anchored hearing aids in unilateral inner ear deafness: an avaluation of audiometric and patient outcome measurements. Audiological evaluation and self-assessed hearing problems in subjects with single-sided congenital external ear malformations and associated conductive hearing loss, International J Audiology. Professor, Department of Speech Pathology, Faculty of Dentistry of Bauru, University of Sao Paulo.2 Specialist in Clinical Audiology from the University Tuiuti.



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