Clinical Practice & Epidemiology in Mental Health




ISSN: 1745-0179 ― Volume 14, 2018
RESEARCH ARTICLE

Tinnitus: The Sound of Stress?



Patricia Ciminelli1, 2, *, Sergio Machado1, 3, Manoela Palmeira1, Mauro Giovanni Carta4, Sarah Cristina Beirith2, Michelle Levitan Nigri1, Marco André Mezzasalma1, Antonio Egidio Nardi1
1 Laboratory of Panic & Respiration, Institute of Psychiatry, Federal University of Rio de Janeiro, Rua Venceslau Bras, 71 CIPE. Botafogo, Rio de Janeiro, Brazil
2 Lagoa Federal Hospital, Ministry of Health, Rio de Janeiro, Brazil
3 Physical Activity Neuroscience, Physical Activity Sciences Postgraduate Program, Salgado de Oliveira University, Niterói, Brazil
4 Universitá degli studi di Cagliari, Cagliari, Italy

Abstract

Background:

Emotional stress is frequently associated with otologic symptoms as tinnitus and dizziness. Stress can contribute to the beginning or worsening of tinnitus.

Objective:

The objective of the study is to evaluate the presence of stress symptoms in patients with chronic, subjective tinnitus, and correlate its presence to annoyance associated with tinnitus.

Methods:

This is a cross-sectional study. One hundred and eighty patients with chronic, subjective tinnitus were included. Patients answered the Tinnitus Handicap Inventory (THI) to evaluate the impact of tinnitus in the quality of life and answered the Lipp's inventory symptoms of stress for adults (ISSL). The data obtained was organized using Excel® 2010, mean values, linear regression and p-value were calculated.

Results:

Of the 180 patients included in the study, 117 (65%) had stress symptoms, 52 of the 117 (44%) were in the resistance phase and 23 of the 117 (20%) in the exhaustion phase, the remaining was in the alert phase. There was a clear progressive increase in stress as THI raised, with more impact of tinnitus in quality of life.

Conclusion:

The presence of stress symptoms, measured by ISSL was observed in most of our patients with chronic subjective tinnitus, specially in the resistance and exhaustion phases and it is directly associated with tinnitus annoyance.

Keywords: Tinnitus, Psychosocial stress, Psychosocial comorbidities, Annoyance, Stress, Psychological.


Article Information


Identifiers and Pagination:

Year: 2018
Volume: 14
First Page: 264
Last Page: 269
Publisher Id: CPEMH-14-264
DOI: 10.2174/1745017901814010264

Article History:

Received Date: 16/4/2018
Revision Received Date: 19/9/2018
Acceptance Date: 2/10/2018
Electronic publication date: 31/10/2018
Collection year: 2018

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© 2018 Ciminelli et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


* Address correspondence to this author at the Laboratory of Panic & Respiration, Institute of Psychiatry, Federal University of Rio de Janeiro, Rua Venceslau Bras, 71 CIPE. Botafogo, Rio de Janeiro, Brazil; Tel: +5521992334888; E-mail: patriciaciminelli@gmail.com




1. INTRODUCTION

Stress is defined as the result of psychological and physical conditions that threaten the normal functioning of ones body [1Lipp MEN. O Stress no Brasil: Pesquisas avançadas 2004.]. It is frequently related to numerous medical conditions, including tinnitus. Stress is associated with events difficult to control or manage, related to social, physical, economic, emotional or occupational demands [2Colman AM. Oxford Dictionary of Psychology 2009.].

Tinnitus is a very common auditory disorder affecting approximately 10-15% of the population. Although tinnitus is commonly caused by auditory system damages, the role of emotional and psychological factors inducing and maintaining annoyance has been proven in recent tinnitus studies [3Heinecke K, Weise C, Schwarz K, Rief W. Physiological and psychological stress reactivity in chronic tinnitus. J Behav Med 2008; 31(3): 179-88.[http://dx.doi.org/10.1007/s10865-007-9145-0] [PMID: 18193350] ].

Stress is many times attributed as a cause of tinnitus and we often see in the clinic that patients complain that their tinnitus gets worse after stressful situations. The evidence that stress is related to tinnitus is based on studies that show high psychiatric comorbidity related to the symptom. About 10– 60% of chronic tinnitus patients suffer from depressive disorders and 28–45% present with clinically relevant anxiety symptoms [4Andersson G. Psychological aspects of tinnitus and the application of cognitive-behavioral therapy. Clin Psychol Rev 2002; 22(7): 977-90.[http://dx.doi.org/10.1016/S0272-7358(01)00124-6] [PMID: 12238249] , 5Reynolds P, Gardner D, Lee R. Tinnitus and psychological morbidity: A cross-sectional study to investigate psychological morbidity in tinnitus patients and its relationship with severity of symptoms and illness perceptions. Clin Otolaryngol Allied Sci 2004; 29(6): 628-34.[http://dx.doi.org/10.1111/j.1365-2273.2004.00879.x] [PMID: 15533150] ]. It has been frequently observed that many tinnitus patients present with psychological or psychiatric distress before or during the onset and evolution of tinnitus [6Mazurek B, Haupt H, Joachim R, Klapp BF, Stöver T, Szczepek AJ. Stress induces transient auditory hypersensitivity in rats. Hear Res 2010; 259(1-2): 55-63.[http://dx.doi.org/10.1016/j.heares.2009.10.006] [PMID: 19840840] ]. Some studies that have used stress questionnaires in tinnitus patients found a high prevalence of self-reported levels of stress. Gomaa et al., found that among 100 patients with tinnitus only 25 didn´t have stress; 44 had mild to moderate stress and 31 severe to extreme levels of stress. There is probably a cause and effect relationship between tinnitus and stress [7Gomaa MA, Elmagd MH, Elbadry MM, Kader RM. Depression, anxiety and stress scale in patients with tinnitus and hearing loss. Eur Arch Otorhinolaryngol 2014; 271(8): 2177-84.[http://dx.doi.org/10.1007/s00405-013-2715-6] [PMID: 24071860] ].

The aim of the present study is to evaluate the presence of stress symptoms in patients with chronic, subjective tinnitus, using the Lipp's inventory of symptoms of stress for adults (ISSL), as well as to correlate its presence to the annoyance associated to tinnitus, applying the Tinnitus Handicap Inventory (THI). The hypothesis suggested in this cross-sectional study is that higher THI scores are correlated with worst stress levels.

2. METHODS

One hundred and eighty patients with chronic (for more than 6 months), subjective tinnitus, with ages 27-79 years were evaluated at a tinnitus clinic in the otorhynolaryngology department at a referral hospital in our city, according to an established clinical protocol for tinnitus patients. Before agreeing to participate in the study, patients signed the informed consent. The study was approved by the local ethic committee, approval number 42441514.0.0000.5291. All patients, who were referred to our clinic from January 2014 to January 2015, were submitted to routine exams for tinnitus diagnosis and were included in the study. Patients answered the THI and the visual analog scale, to evaluate the impact of tinnitus in the quality of life and answered the ISSL, to evaluate the presence of stress symptoms, which is composed by 37 somatic items and 19 psychological items. These items are organized in three phases of stress: alert, resistance and exhaustion phases. They also answered the Mini International Neuropsychiatric Interview (MINI) Questionnaire v. 5.0 for the investigation of the presence of concomitant psychiatric disorders.

The inclusion criteria were:

  • Presence of tinnitus for at least 6 months.
  • Ability to answer the questionnaires.
  • Patient agreement to participate in this study.

The exclusion criteria were:

  • Mild and Severe cognitive impairment.
  • Diagnosis of central nervous system tumors, including cerebellum-pontine angle (CPA) tumors.
  • Recent surgery or otologic procedure, including implantable hearing devices.
  • Presence of psychiatric disorders diagnosed by the MINI.

2.1. Statistical Analysis

The THI and the ISSL scores in the analysis are reported with mean and standard deviation.

The level of significance used as a reference was set at p ≤ 0.05.

Inferential statistics were performed using Pearson's correlation performed with the Statistical Package for the Social Sciences 23.0 (SPSS).

3. RESULTS

One hundred and eighty patients were included in the study, 75 (41,6%) male and 105 (58,4%) female. The age ranged from 27 to 79 years, mean 59.86 years (SD 12.5). The time since the beginning of tinnitus was: from 6 months to 4 years in 93 patients (51,6%), from 5 to 10 years in 60 (33,3%) and more than 10 years in 27 (15%) patients. None of the patients had psychiatric disorders nor were taking medications targeting the central nervous system or ototoxic medications.

The mean THI score was 43.43 (SD 23.99) and the mean visual analog scale score was 6.91 (SD 14.95). Grade I or slight tinnitus in THI was found in 27 (15%) patients, grade II or mild, in 54 (30%) patients, grade III or moderate, in 42 (23,3%) patients, grade IV or severe, in 39 (21,6%) patients and grade V or catastrophic, in 18 (10%) patients (Fig. 1).

Fig. (1)
THI scores.


Of the 180 patients included in the study, 117 (65%) had stress symptoms, 52 (44%) of the 117 were in the resistance phase and 23 of 117 (20%) in the exhaustion phase, the remaining patients were in the alert phase of stress (Fig. 2).

Fig. (2)
Stress phases in tinnitus patients with stress.


In the slight tinnitus group, 12 (44.4%) patients had stress symptoms. In the mild tinnitus group of patients, 30 (55.5%) had stress. Thirty-three (78,5%) of the patients with grade III tinnitus had stress symptoms; Twenty four (61.5%) in grade IV and all patients (100%) in grade V had stress. We noticed a clear progressive increase in stress as THI gets higher, with more impact in quality of life. The prevalence in each group is represented in Fig. (3).

Fig. (3)
Number of patients with stress in each THI grade.


To evaluate the proposed hypothesis (H1), a linear regression with stress being the dependent variable and THI the independent value was done. The p-value found was 0.00576, demonstrating that the higher the annoyance, the more stressed patients are.

4. DISCUSSION

The results presented show a high occurrence of stress symptoms in tinnitus patients evaluated in a reference tinnitus clinic, specially in the more advanced phases, the resistance and exhaustion phases. We observed a clear increase in stress symptoms in patients with higher THI scores, being stress present in all patients with catastrophic tinnitus. To our knowledge, this is the first study in Brazil using a stress scale in tinnitus patients.

There is enough evidence supporting the understanding that tinnitus induces stress. However, still little is known about stress being responsible for the appearance or worsening of tinnitus. It has been frequently observed that many tinnitus patients present with psychological or psychiatric distress before or during the onset and evolution of tinnitus [8Mazurek B, Haupt H, Olze H, Szczepek AJ. Stress and tinnitus-from bedside to bench and back. Front Syst Neurosci 2012; 11: 6-47.]. Which comes first is still unknown but authors agree that stress is obviously related to tinnitus and directly associated to its annoyance.

One of the earliest published studies showing an evidence between the onset of tinnitus to psycho-social distress was made by John Harrison Curtis, describing two of five patients that related the beginning of tinnitus to a psycho-social stress caused by death of a close family member [9Baigi A, Oden A, Almlid-Larsen V, Barrenäs ML, Holgers KM. Tinnitus in the general population with a focus on noise and stress: A public health study. Ear Hear 2011; 32(6): 787-9.[http://dx.doi.org/10.1097/AUD.0b013e31822229bd] [PMID: 21716113] ]. One hundred and seventy years later, two large studies published important epidemiological information concerning the association of psychosocial stress with tinnitus [9Baigi A, Oden A, Almlid-Larsen V, Barrenäs ML, Holgers KM. Tinnitus in the general population with a focus on noise and stress: A public health study. Ear Hear 2011; 32(6): 787-9.[http://dx.doi.org/10.1097/AUD.0b013e31822229bd] [PMID: 21716113] , 10Hasson D, Theorell T, Wallén MB, Leineweber C, Canlon B. Stress and prevalence of hearing problems in the Swedish working population. BMC Public Health 2011; 23: 11-130.]. The first study demonstrated that the probability of developing tinnitus is approximately the same for highly stressed persons as it is for persons exposed to occupational noise [9Baigi A, Oden A, Almlid-Larsen V, Barrenäs ML, Holgers KM. Tinnitus in the general population with a focus on noise and stress: A public health study. Ear Hear 2011; 32(6): 787-9.[http://dx.doi.org/10.1097/AUD.0b013e31822229bd] [PMID: 21716113] ], stress seems as important as auditory damage for causing tinnitus. Importantly, the authors also have noticed that psycho-social stress contributes to worsening of tinnitus symptoms. The studies describe that exposure to high levels of stress and occupational noise, together, doubles the probability of developing tinnitus. In the second study, approximately one-third of the working population observed and complained of hearing problems, tinnitus or both. Tinnitus and the duration and magnitude of stress were linearly associated [10Hasson D, Theorell T, Wallén MB, Leineweber C, Canlon B. Stress and prevalence of hearing problems in the Swedish working population. BMC Public Health 2011; 23: 11-130.]. Both studies included more than 10,000 subjects each, which provides great statistical strength relating tinnitus to stress. Mazurek et al., [6Mazurek B, Haupt H, Joachim R, Klapp BF, Stöver T, Szczepek AJ. Stress induces transient auditory hypersensitivity in rats. Hear Res 2010; 259(1-2): 55-63.[http://dx.doi.org/10.1016/j.heares.2009.10.006] [PMID: 19840840] , 11Mazurek B, Olze H, Haupt H, Szczepek AJ. The more the worse: The grade of noise-induced hearing loss associates with the severity of tinnitus. Int J Environ Res Public Health 2010; 7(8): 3071-9.[http://dx.doi.org/10.3390/ijerph7083071] [PMID: 20948948] ], described higher scores in the “worries” and “tension” subscales of the Perceived Stress Questionnaire in patients with disturbing chronic tinnitus when compared to those with non-disturbing tinnitus. Similarly, in our study, 65% of our tinnitus patients had stress symptoms, measured by the Lipp's Stress Symptoms Scale.

For many patients, with increased reactivity to stress, tinnitus may work as an alarm signal, at least at its onset, informing the patient that something could be wrong or that something potentially dangerous could be happening and stress factors are clearly related to this reaction. Aspects concerning this danger alarm and the way patients react to and face the symptom can explain the epidemiological differences between the incidence of referred tinnitus (10–15%) and that of disabling tinnitus (2%). In other words, tinnitus becomes a disabling symptom in subjects chronically exposed to stress who are unable to switch off the alarm signal or to neutralize the effect of the stressors. In other individuals, the same factors or diseases could provoke tinnitus without inducing annoyance or distress because these subjects are skilled to cope with tinnitus as a stressor, with a real capacity to restore normal body stability. Individual capacity to neutralize stress factors is strictly specific for each subject: the progression from alarm to exhaustion stress phases is specific for each patient. In a referral tinnitus clinic, one would expect a higher number of patients in resistance and exhaustion phases, as found in our study. It is demanding to identified the stress signals during the alarm phase to prevent a progression toward the resistance phase and, especially, exhaustion phase. These later phases can lead to chronic disabling tinnitus, in which there are an important emotional-affective activation [12Alpini D, Cesarani A. Tinnitus as an alarm bell: Stress reaction tinnitus model. ORL J Otorhinolaryngol Relat Spec 2006; 68(1): 31-6.[http://dx.doi.org/10.1159/000090488] [PMID: 16514260] , 13Alpini D, Cesarani A, Hahn A. Tinnitus school: An educational approach to tinnitus management based on a stress-reaction tinnitus model. Int Tinnitus J 2007; 13(1): 63-8.[PMID: 17691666] ].

Assuming that tinnitus patients have a greater amount of stress reactivity, maladjustment to daily stress situations could be a consequence. It has been demonstrated that decompensated tinnitus patients use more maladaptive coping strategies compared to controls [14Budd RJ, Pugh R. Tinnitus coping style and its relationship to tinnitus severity and emotional distress. J Psychosom Res 1996; 41(4): 327-35.[http://dx.doi.org/10.1016/S0022-3999(96)00171-7] [PMID: 8971662] -17Schmitt C, Patak M, Kröner-Herwig B. Stress and the onset of sudden hearing loss and tinnitus. Int Tinnitus J 2000; 6(1): 41-9.[PMID: 14689617] ]. Concerning the physiological factors, maladaptive stress reactivity in chronic tinnitus patients should lead to excessive reactivity in the autonomous nervous system. Some studies addressed and evidenced the role of abnormal physiological stress reactions in the onset and maintenance of tinnitus symptoms [18Horner KC. The emotional ear in stress. Neurosci Biobehav Rev 2003; 27(5): 437-46.[http://dx.doi.org/10.1016/S0149-7634(03)00071-X] [PMID: 14505685] -20Datzov E, Danev S, Haralanov H, Naidenova V, Sachanska T, Savov A. Tinnitus, heart rate variability, and some biochemical indicators. Int Tinnitus J 1999; 5(1): 20-3.[PMID: 10753412] ]. The high efficacy of psychotherapy in the treatment of tinnitus sufferers argues in favor of stress reactivity related to tinnitus distress [21Andersson G, Lyttkens L. A meta-analytic review of psychological treatments for tinnitus. Br J Audiol 1999; 33(4): 201-10.[http://dx.doi.org/10.3109/03005369909090101] [PMID: 10509855] ], considering that most of these treatment programs address coping strategies to stress. Also, studies testing the effect of relaxation training emphasize psychophysiological factors in chronic tinnitus patients [22Weber C, Arck P, Mazurek B, Klapp BF. Impact of a relaxation training on psychometric and immunologic parameters in tinnitus sufferers. J Psychosom Res 2002; 52(1): 29-33.[http://dx.doi.org/10.1016/S0022-3999(01)00281-1] [PMID: 11801262] , 23Rief W, Weise C, Kley N, Martin A. Psychophysiologic treatment of chronic tinnitus: A randomized clinical trial. Psychosom Med 2005; 67(5): 833-8.[http://dx.doi.org/10.1097/01.psy.0000174174.38908.c6] [PMID: 16204446] ]. Many patients may also benefit from the use of drugs targeting the central nervous system in order to reduce anxiety and stress associated symptoms [24Fornaro M, Martino M. Tinnitus psychopharmacology: A comprehensive review of its pathomechanisms and management 2010; 6: 209-18.]

The information collected here, indirectly imply the requirement for psychological assessment during the diagnosis of tinnitus patients. Psychological intervention with a goal of stress-management strategies appears to be an indispensable element in tinnitus treatment, especially important to use in very early stages of tinnitus, before the chronification of plastic changes has taken place, considering that stress is highly associated to tinnitus, as a cause or effect.

Here, we discuss a limitation of our study, the lack of a control group. Our intention was solely to describe the presence of stress and to stratify its stages and correlate with tinnitus annoyance in a selected group of patients referred to a specialized tinnitus clinic.

CONCLUSION

The presence of stress symptoms, measured by the Lipp's Adult Stress Tinnitus Inventory (ISSL), was observed in the majority of our patients with chronic subjective tinnitus, specially in the resistance and exhaustion phases and it seems to be directly associated to tinnitus annoyance. There’s a close relationship between psychological disorders, including stress, and the occurrence and maintenance of tinnitus, causing an impact on patient's quality of life. This article motivates professionals to consider stress an important symptom to be diagnosed and treated in tinnitus patients.

ETHICS APPROVAL AND CONSENT TO PARTICIPATE

The study was approved by the local Ethic Committee of University Veiga de Almeida / UVA, approval number 42441514.0.0000.5291.

HUMAN AND ANIMAL RIGHTS

All the reported experiments in accordance with the ethical standards of the committee responsible for human experimentation (institutional and national), and with the Helsinki Declaration of 1975, as revised in 2013 (http://ethics.iit.edu/ecodes/node/3931.

CONSENT FOR PUBLICATION

Written and informed consent was obtained for the study.

CONFLICT OF INTEREST

The authors declare no conflict of interest, financial or otherwise.

ACKNOWLEDGEMENTS

We are grateful for the department of Otolaringology at Lagoa Federal Hospital and the Laboratory of panic and respiration for all the help.

REFERENCES

[1] Lipp MEN. O Stress no Brasil: Pesquisas avançadas 2004.
[2] Colman AM. Oxford Dictionary of Psychology 2009.
[3] Heinecke K, Weise C, Schwarz K, Rief W. Physiological and psychological stress reactivity in chronic tinnitus. J Behav Med 2008; 31(3): 179-88.[http://dx.doi.org/10.1007/s10865-007-9145-0] [PMID: 18193350]
[4] Andersson G. Psychological aspects of tinnitus and the application of cognitive-behavioral therapy. Clin Psychol Rev 2002; 22(7): 977-90.[http://dx.doi.org/10.1016/S0272-7358(01)00124-6] [PMID: 12238249]
[5] Reynolds P, Gardner D, Lee R. Tinnitus and psychological morbidity: A cross-sectional study to investigate psychological morbidity in tinnitus patients and its relationship with severity of symptoms and illness perceptions. Clin Otolaryngol Allied Sci 2004; 29(6): 628-34.[http://dx.doi.org/10.1111/j.1365-2273.2004.00879.x] [PMID: 15533150]
[6] Mazurek B, Haupt H, Joachim R, Klapp BF, Stöver T, Szczepek AJ. Stress induces transient auditory hypersensitivity in rats. Hear Res 2010; 259(1-2): 55-63.[http://dx.doi.org/10.1016/j.heares.2009.10.006] [PMID: 19840840]
[7] Gomaa MA, Elmagd MH, Elbadry MM, Kader RM. Depression, anxiety and stress scale in patients with tinnitus and hearing loss. Eur Arch Otorhinolaryngol 2014; 271(8): 2177-84.[http://dx.doi.org/10.1007/s00405-013-2715-6] [PMID: 24071860]
[8] Mazurek B, Haupt H, Olze H, Szczepek AJ. Stress and tinnitus-from bedside to bench and back. Front Syst Neurosci 2012; 11: 6-47.
[9] Baigi A, Oden A, Almlid-Larsen V, Barrenäs ML, Holgers KM. Tinnitus in the general population with a focus on noise and stress: A public health study. Ear Hear 2011; 32(6): 787-9.[http://dx.doi.org/10.1097/AUD.0b013e31822229bd] [PMID: 21716113]
[10] Hasson D, Theorell T, Wallén MB, Leineweber C, Canlon B. Stress and prevalence of hearing problems in the Swedish working population. BMC Public Health 2011; 23: 11-130.
[11] Mazurek B, Olze H, Haupt H, Szczepek AJ. The more the worse: The grade of noise-induced hearing loss associates with the severity of tinnitus. Int J Environ Res Public Health 2010; 7(8): 3071-9.[http://dx.doi.org/10.3390/ijerph7083071] [PMID: 20948948]
[12] Alpini D, Cesarani A. Tinnitus as an alarm bell: Stress reaction tinnitus model. ORL J Otorhinolaryngol Relat Spec 2006; 68(1): 31-6.[http://dx.doi.org/10.1159/000090488] [PMID: 16514260]
[13] Alpini D, Cesarani A, Hahn A. Tinnitus school: An educational approach to tinnitus management based on a stress-reaction tinnitus model. Int Tinnitus J 2007; 13(1): 63-8.[PMID: 17691666]
[14] Budd RJ, Pugh R. Tinnitus coping style and its relationship to tinnitus severity and emotional distress. J Psychosom Res 1996; 41(4): 327-35.[http://dx.doi.org/10.1016/S0022-3999(96)00171-7] [PMID: 8971662]
[15] Budd RJ, Pugh R. The relationship between locus of control, tinnitus severity, and emotional distress in a group of tinnitus sufferers. J Psychosom Res 1995; 39(8): 1015-8.[http://dx.doi.org/10.1016/0022-3999(95)00512-9] [PMID: 8926596]
[16] Kirsch CA, Blanchard EB, Parnes SM. Psychological characteristics of individuals high and low in their ability to cope with tinnitus. Psychosom Med 1989; 51(2): 209-17.[http://dx.doi.org/10.1097/00006842-198903000-00009] [PMID: 2710911]
[17] Schmitt C, Patak M, Kröner-Herwig B. Stress and the onset of sudden hearing loss and tinnitus. Int Tinnitus J 2000; 6(1): 41-9.[PMID: 14689617]
[18] Horner KC. The emotional ear in stress. Neurosci Biobehav Rev 2003; 27(5): 437-46.[http://dx.doi.org/10.1016/S0149-7634(03)00071-X] [PMID: 14505685]
[19] Sahley TL, Nodar RH. A biochemical model of peripheral tinnitus. Hear Res 2001; 152(1-2): 43-54.[http://dx.doi.org/10.1016/S0378-5955(00)00235-5] [PMID: 11223280]
[20] Datzov E, Danev S, Haralanov H, Naidenova V, Sachanska T, Savov A. Tinnitus, heart rate variability, and some biochemical indicators. Int Tinnitus J 1999; 5(1): 20-3.[PMID: 10753412]
[21] Andersson G, Lyttkens L. A meta-analytic review of psychological treatments for tinnitus. Br J Audiol 1999; 33(4): 201-10.[http://dx.doi.org/10.3109/03005369909090101] [PMID: 10509855]
[22] Weber C, Arck P, Mazurek B, Klapp BF. Impact of a relaxation training on psychometric and immunologic parameters in tinnitus sufferers. J Psychosom Res 2002; 52(1): 29-33.[http://dx.doi.org/10.1016/S0022-3999(01)00281-1] [PMID: 11801262]
[23] Rief W, Weise C, Kley N, Martin A. Psychophysiologic treatment of chronic tinnitus: A randomized clinical trial. Psychosom Med 2005; 67(5): 833-8.[http://dx.doi.org/10.1097/01.psy.0000174174.38908.c6] [PMID: 16204446]
[24] Fornaro M, Martino M. Tinnitus psychopharmacology: A comprehensive review of its pathomechanisms and management 2010; 6: 209-18.

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Jaime Sampaio
(University of Trás-os-Montes e Alto Douro, Portugal)

"Open access journals make up a new and rather revolutionary way to scientific publication. This option opens several quite interesting possibilities to disseminate openly and freely new knowledge and even to facilitate interpersonal communication among scientists."


Eduardo A. Castro
(INIFTA, Argentina)

"Open access journals are freely available online throughout the world, for you to read, download, copy, distribute, and use. The articles published in the open access journals are high quality and cover a wide range of fields."


Kenji Hashimoto
(Chiba University, Japan)

"Open Access journals offer an innovative and efficient way of publication for academics and professionals in a wide range of disciplines. The papers published are of high quality after rigorous peer review and they are Indexed in: major international databases. I read Open Access journals to keep abreast of the recent development in my field of study."


Daniel Shek
(Chinese University of Hong Kong, Hong Kong)

"It is a modern trend for publishers to establish open access journals. Researchers, faculty members, and students will be greatly benefited by the new journals of Bentham Science Publishers Ltd. in this category."


Jih Ru Hwu
(National Central University, Taiwan)


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