aging is part of the natural process of human development , and it brings multiple biopsychosocial changes that cause a slow and progressive deterioration of body functions that are essential to life . among these functions that undergo important mostly irreversible changes is hearing.1 hearing loss is considered one of the three most common conditions in the elderly,2 with occurrence of 5 to 20% in 60-year - olds , increasing to 60% in people over 65 years old.1 
 3 in brazil , 60% of the elderly have some degree of hearing loss.4 
  the term used to describe hearing loss associated with aging is presbycusis , which causes a decrease in hearing sensitivity and a reduction in the ability to understand speech .
this occurs due to several degenerative and physiologic changes that affect the inner ear , impairing hearing at high frequencies and affecting communication , especially in noisy environments.1 
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 7 other factors associated with the natural degeneration process , such as exposure to loud noise , ototoxic agents , and sequelae of otitis media caused by medical problems and treatments , can contribute to lifelong aggravation of the loss.4 
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  difficult communication associated with hearing loss can lead to social and emotional consequences , especially for the elderly , who have several limitations related to aging that can impact their quality of life , increasing social isolation in addition to causing emotional disorders such as depression.1 
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 11 hearing loss  associated depression can be even more harmful in the elderly .
thus , recommended intervention by hearing aid adaptation contributes to the prevention of emotional disorders such as depression.12 
 depression is defined as a mental disorder that causes feelings of sadness , pessimism , hopelessness , difficulty concentrating , and difficulty making decisions and initiating tasks , among other symptoms.13 despite being very common in the elderly , it can not be attributed solely to aging .
studies in so paulo ( brazil)14 and florianpolis ( santa catarina , brazil)15 showed that the factors associated with depression in the elderly are : female , unmarried or widowed , altered cognitive function , dependence , use of many medicines , very old ( over 80 years ) , low education , poor economic status , cognitive impairment , fair or poor self - rated health , functional dependency , and chronic pain .
other causes include smoking , comorbidities ( endocrine , vascular , neurologic , oncological ) , and negative changes in relationships with family and friends.15 
  hearing loss may be associated with depression to be a debilitating , chronic disorder.16 
 17 
 18 the main goal of an auditory rehabilitation program in elderly patients is to minimize the effects caused by sensory deprivation of hearing and reinstate the patients in their family and society , helping them cope with the disadvantages and limitations caused by hearing loss.3 
  monaural adaptations are commonly performed even in cases of bilateral hearing loss , whereas the most appropriate should be binaural adaptation .
the reasons for that may be related to factors such as rejection to the use of two hearing aids , financial issues , aesthetic reasons , problems with manual dexterity , very asymmetric losses , and central processing issues.19 
  given such reality , this work intends to analyze the effects of unilateral adaptation of hearing aids on the symptoms of depression and the social activity constraints of elderly subjects with hearing impairment .
this is a prospective interventional study of elderly individuals of both sexes with recommended use of hearing aids at a hearing center in porto alegre .
inclusion criteria were signature of the free and informed consent ; 60 years or older ; good health ( seniors able to commute to the research location , conduct tests , and answer questionnaires ) ; new hearing aid users with monaural fitting ; and participation in all phases of the research . exclusion criteria were initiation of antidepressant therapy during the study and a history of cognitive and/or neurologic disorders .
the study was divided into two phases . in phase 1 , subjects responded to an interview with questions on demographics and health ( general and hearing ) .
pure tone audiometry was performed to determine the airway tone thresholds ( frequencies 250 to 8,000 hz ) and bone conduction ( frequencies 500 to 4,000 hz ) in a vocal booth , using an ad-229e interacoustics audiometer ( assens , denmark ) .
the presence and degree of hearing loss were classified according to the world health organization by analyzing mean airway tone threshold in the frequencies of 500 , 1,000 , 2,000 , and 4,000 hz.20 
  after that , seniors were asked to answer two questionnaires individually , without the intervention of third parties : the geriatric depression scale ( gds ) and the hearing handicap inventory for elderly  short version ( hhie - s ) .
the gds , an instrument validated for portuguese and composed of 15 yes - or - no questions , is used to detect depression symptoms in the elderly .
thus , scores less than 5 points indicate absence of symptoms , scores of 5 to 10 indicate mild to moderate symptoms , and scores of 11 or more indicate severe symptoms of depression.21 
  after completing the first phase , participants answered a summarized version of the hhie - s .
the questionnaire was prepared in 198222 and translated and adapted to brazilian portuguese.23 it contains 10 questions that aim to assess the impact of hearing loss on the emotional and social status of elderly people .
all 10 questions provide three choices of answers : for each  yes  answer , 4 points is assigned ; each  sometimes ,  2 points ; and each  no ,  0 points . the total score ranges from 0 to 40 points , and the higher the score , the greater subjects ' self - perception of social activity constraints : 0 to 8 points indicate no social activity constraints ; 10 to 23 points , mild to moderate social activity constraint ; and 24 to 40 points , significant social activity constraints.8 
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  after testing , the participants were subjected to the selection and unilaterally hearing aid adaptation processes
thirty days after purchasing the device , they returned to the hearing center to participate in the second phase of the research . in phase 2
the research project was approved by the research committee and by the ethics and research committee of the institution ( protocol 266.060 ) .
patients who agreed to participate signed an informed consent and had their rights guaranteed for confidentiality , nonidentification , and withdrawal of participation .
the results were analyzed using the statistical package for social science version 20.0 ( ibm , ny , usa ) . to examine associations of categorical data , the chi - square and student t test for paired samples were used .
all statistical tests were nonparametric tests , and always observed exact p value ( not asymptotic ) , which are the best measures to statistically evaluate a study when the sample is restricted .
the chi - square test considered the p value of fisher exact test , and for the kappa coefficient of agreement , the exact p value ( not asymptotic ) was observed .
the sample consisted of 13 elderly patients with hearing loss , ages from 60 to 90 years ( mean 72.85    11.05 years ) , 10 women ( 76.9% ) and 3 men ( 23.1% ) .
table 1 shows data on the characterization of sample in terms of age , gender , mean thresholds , and degree of hearing loss . 

table 2 depicts an association analysis between the gds classification of phases 1 and 2 , indicating that there was no significant association between the variables in the periods before and after the adaptation ( p  =  0.615 ) .
thus , of the 6 patients ( 46.2% ) who initially had mild symptoms of depression , only 2 ( 15.4% ) of them continued to have mild symptoms .
all seniors who initially had severe symptoms of depression ( 15.4% ) also started to lose some symptoms of depression in phase 2 .
hhie classification analysis in phases 1 and 2 of the study are presented in table 3 .
no significant association was found for these variables in the periods before and after the adaptation ( p  >  0.999 ) .
thus , the only senior who had mild to moderate social activity constraints in the first phase showed reduction in the second phase .
after prosthetization , participants who had severe social activity constraints in phase 1 started to show no social activity constraints or mild to moderate social activity constraints . only 1 ( 7.7% )
the lack of association between the classification of the gds and hhie on the two phases is an important point , because it shows that there were different results in both assessments ( before and after hearing aid adaptation)that is , on the sample studied , unilateral prosthetization resulted in benefits for patients . 

table 4 shows the scores obtained by the subjects in the instruments used for evaluation in the two phases of the research .
there was significant difference between the gds ( p  =  0.031 ) and hhie ( p  < 
abbreviations : gds , geriatric depression scale ; hhie - s , hearing handicap inventory for elderly  short version . 

the analysis of the survey data showed that the age of the individuals analyzed varied from 60 to 90 years .
another study that examined the degeneration of the auditory system in the course of aging had a sample with similar age and results.4 
  we had a greater number of female participants . although it has been found that men often have more problems related to hearing loss than women,24 they also have a lower perception of their disability compared with women,1 
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 26 which explains why women seek health services more often26 
 27 and why there is a greater number of female participants in this study .
another fact to be noted is that , in terms of population , there is a greater number of older women in brazil , a fact known as feminization of aging.28 
  there was a prevalence of moderate hearing loss in both the right and the left ears , agreeing with other published studies that refer to this as being the most commonly found degree of hearing impairment in the elderly.2 
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  the data show that many seniors had some degree of depression symptoms before prosthetization ( table 2 ) .
after unilateral hearing aid adoption , there was improvement in symptoms for most of them .
thus , a hearing aid , even when unilateral , promoted elimination or reduction of symptoms of depression in the sample studied .
this result had already been described in the literature,2 but we emphasize that the result was obtained with bilateral prosthesis .
thus , the adaptation of a single amplifying device can also generate benefit for elderly patients , which is important for the reduction of one of the most prevalent problems in the aging population , depression .
the data show that all participants had some degree of social activity constraints before using a unilateral hearing aid ( table 3 ) .
after 30 days of hearing aid use , 12 ( 93.3% ) and 13 ( 100% ) participants showed absence or reduction of social activity constraints , respectively .
results show evidence of the positive effects of hearing aid use , even if unilateral , helping to reduce the impact that hearing loss has on social relationships and on the quality of life of the elderly.9 results are consistent with another study that examined the short - term benefits of amplification in new users.29 
  the data also show a significant difference in scores obtained in phases 1 and 2 of the gds ( p  =  0.031 ) and hhie - s ( p  <  0.001 ) , confirming a reduction or elimination of depression symptoms and social activity constraints in elderly patients , agreeing with other published studies ( table 4).2 
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 30 again , it is important to highlight that in the studied group , unilateral prosthesis resulted in substantial benefits not only regarding hearing but also in other matters essential for the well - being and quality of life of individuals .
the findings reinforce the importance of hearing aid use in elderly patients , because many times family and social relationships are affected by the hearing impairment .
the adaptation to amplification devices , albeit unilaterally , has proved to be effective in reducing symptoms of depression and social activity constraints .
moreover , the length of time between assessments was 30 days , shorter than that considered ideal for auditory acclimatization , and even then , benefits occurred , confirming the importance of auditory rehabilitation in elderly .
results show that unilateral hearing aid contributed to the elimination or reduction of depression symptoms and of social activity constraints in elderly participants in this research sample group .
 
 introduction  hearing loss is one of the most common problems in the elderly population . besides compromising oral communication , it directly affects social relations and prevents elderly patients from living actively in society , possibly leading to the onset of depression or other conditions . 
 objective  to analyze the effects of unilateral adaptation of hearing aids on symptoms of depression and the social activity constraints of elderly subjects with hearing impairment . 
 
 methods  the sample consisted of elderly subjects with hearing loss who did not use hearing aids . 
 data were collected in two phases . 
 initially , all participants underwent an audiological assessment and answered the hearing handicap inventory for elderly ( summarized version ) and the geriatric depression scale . 
 all subjects participated in the selection and hearing aid adaptation processes and became monaural hearing aid users . after 30 days of hearing aid use , they were assessed with the same instruments . 
 the results of the questionnaires before and after hearing aid adaptation were compared . 
 
 results  the sample consisted of 13 individuals , between 60 and 90 years old ( mean 72.85    11.05 years ) . 
 data analysis showed that there was significant improvement in social activity constraints ( p  <  0.001 ) and in symptoms of depression ( p  =  0.031 ) . 
 
 conclusion  results show that , in the sample studied , unilateral hearing aid adaptation reduced social activity constraints and depression symptoms . 
Introduction
Methods
Results
Discussion
Conclusion