1
|
Namasivaya Navin RB, Prabakaran S, Balaji D, Gowthame K, Rajasekaran S, Sarath Kumar B, Shree R, Lakshana R. An Observational Study of Hearing Loss Among Menopausal Women. Indian J Otolaryngol Head Neck Surg 2024; 76:176-180. [PMID: 38440464 PMCID: PMC10908971 DOI: 10.1007/s12070-023-04121-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Accepted: 07/27/2023] [Indexed: 03/06/2024] Open
Abstract
Senile deafness and hearing loss in adults over 50 are major public health issues as a result of the population's ageing demographic. Menopausal women tend to develop hearing loss, while no clear link has been found between the two. The purpose of this study was to determine how menopause and diabetes mellitus affects hearing loss. We assessed 158 menopausal women in total. Pure Tone Audiometry and HbA1c levels was measured, along with appropriate clinical history and examination. The association between those levels and hearing was researched by chi-square test. There were 158 study participants. Mean age of the study population was 50.5 (± 2.49) years. Onset and duration of hard of hearing was assessed in 41 patients (25.9%). 33% (N = 53) of the patients had history of Diabetes mellitus, of which 52.8% offered history of the disease for more than or equal to five years. On audiological assessment, 74.1% had no hearing loss (N = 117), 4.4% had unilateral sensorineural hearing loss (N = 7) and 21.5% had bilateral sensorineural hearing loss (N = 34). Statistics show that hearing loss is statistically connected with ageing and poor glycemic management. With chi square values of 9.629 and P value 0.002 found a significant correlation between ageing and hearing loss. Poor glycemic control is significantly associated with hearing loss with a chi-square value of 4.304 and P value 0.038. Poor glycemic control and menopause is found to be strongly associated with sensorineural hearing loss. Further prospective, hormonal studies including larger population is recommended.
Collapse
Affiliation(s)
- R. B. Namasivaya Navin
- Department of Otorhinolaryngology (ENT), Chettinad Hospital and Research Institue, Chettinad Academy of Research and Education, Kelambakkam, Tamilnadu 603103 India
| | - S. Prabakaran
- Department of Otorhinolaryngology (ENT), Chettinad Hospital and Research Institue, Chettinad Academy of Research and Education, Kelambakkam, Tamilnadu 603103 India
| | - D. Balaji
- Department of Otorhinolaryngology (ENT), Chettinad Hospital and Research Institue, Chettinad Academy of Research and Education, Kelambakkam, Tamilnadu 603103 India
| | - K. Gowthame
- Department of Otorhinolaryngology (ENT), Chettinad Hospital and Research Institue, Chettinad Academy of Research and Education, Kelambakkam, Tamilnadu 603103 India
| | - S. Rajasekaran
- Department of Otorhinolaryngology (ENT), Chettinad Hospital and Research Institue, Chettinad Academy of Research and Education, Kelambakkam, Tamilnadu 603103 India
| | - B. Sarath Kumar
- Department of Otorhinolaryngology (ENT), Chettinad Hospital and Research Institue, Chettinad Academy of Research and Education, Kelambakkam, Tamilnadu 603103 India
| | - Ramya Shree
- Department of Otorhinolaryngology (ENT), Chettinad Hospital and Research Institue, Chettinad Academy of Research and Education, Kelambakkam, Tamilnadu 603103 India
| | - R. Lakshana
- Department of Otorhinolaryngology (ENT), Chettinad Hospital and Research Institue, Chettinad Academy of Research and Education, Kelambakkam, Tamilnadu 603103 India
| |
Collapse
|
2
|
Aloufi N, Heinrich A, Marshall K, Kluk K. Sex differences and the effect of female sex hormones on auditory function: a systematic review. Front Hum Neurosci 2023; 17:1077409. [PMID: 37151900 PMCID: PMC10161575 DOI: 10.3389/fnhum.2023.1077409] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Accepted: 03/30/2023] [Indexed: 05/09/2023] Open
Abstract
Aims First, to discuss sex differences in auditory function between women and men, and whether cyclic fluctuations in levels of female sex hormones (i.e., estradiol and progesterone) affect auditory function in pre-menopausal and post-menopausal women. Second, to systematically review the literature concerning the discussed patterns in order to give an overview of the methodologies used in research. Last, to identify the gap in knowledge and to make recommendations for future work. Methods for the systematic review Population, Exposure, Control, Outcome and Study design (PECOS) criteria were used in developing the review questions. The review protocol follows the guidelines of the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) and was pre-registered in the Prospective Register of Systematic Reviews (PROSPERO; CRD42020201480). Data Sources: EMBASE, PubMed, MEDLINE (Ovid), PsycINFO, ComDisDome, CINAHL, Web of Science, Cochrane Central Register of Controlled Trials (CENTRAL) via Cochrane Library, and scanning reference lists of relevant studies, and internet resources (i.e., Mendeley) were used. Only studies published between 1999 and 2022, in English, or in English translation, were included. The quality of evidence was assessed using the Newcastle-Ottawa Scale (NOS). Results Sex differences: Women had more sensitive hearing (measured at the level of peripheral and central auditory system) than men. Cyclic fluctuations: Auditory function in women fluctuated during the menstrual cycle, while no such fluctuations in men over the same time period were reported. Hearing sensitivity improved in women during the late follicular phase, and decrease during the luteal phase, implying an effect of female sex hormones, although the specific effects of estradiol and progesterone fluctuations on the central auditory system remain unclear. Hearing sensitivity in women declined rapidly at the onset of menopause. Conclusion The review has shown the following. Consistent sex differences exist in auditory function across the auditory pathway with pre-menopausal women often showing better function than age-matched men. Moreover, pre-menopausal women show fluctuations in hearing function across the menstrual cycle with a better function during the peak of estradiol or when the ratio of estradiol to progesterone is high. Third, menopause marks the onset of hearing loss in women, characterized by a rapid decline in hearing sensitivity and a more pronounced loss than in age-matched men. Finally, the systematic review highlights the need for well-designed and -controlled studies to evaluate the influence of estradiol and progesterone on hearing by consistently including control groups (e.g., age-matched man), using objective tests to measure hormonal levels (e.g., in saliva or blood), and by testing participants at different points across the menstrual cycle. Systematic review registration https://www.crd.york.ac.uk/prospero/display_record.php?ID=CRD42020201480, identifier CRD42020201480.
Collapse
Affiliation(s)
- Nada Aloufi
- Manchester Centre for Audiology and Deafness, Manchester Academic Health Science Centre, Faculty of Biology, Medicine and Health, School of Health Sciences, University of Manchester, Manchester, United Kingdom
- College of Medical Rehabilitation Sciences, Taibah University, Medina, Saudi Arabia
| | - Antje Heinrich
- Manchester Centre for Audiology and Deafness, Manchester Academic Health Science Centre, Faculty of Biology, Medicine and Health, School of Health Sciences, University of Manchester, Manchester, United Kingdom
| | - Kay Marshall
- Division of Pharmacy and Optometry, Faculty of Biology, School of Health Sciences, Medicine and Health, University of Manchester, Manchester, United Kingdom
| | - Karolina Kluk
- Manchester Centre for Audiology and Deafness, Manchester Academic Health Science Centre, Faculty of Biology, Medicine and Health, School of Health Sciences, University of Manchester, Manchester, United Kingdom
| |
Collapse
|
3
|
Lin H, Wang X, Qin S, Luo F, Cen Y, Lash GE, Li L. Incidence and risk factors of hearing loss in patients with Turner Syndrome. Front Public Health 2023; 11:1076812. [PMID: 36998272 PMCID: PMC10043252 DOI: 10.3389/fpubh.2023.1076812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Accepted: 02/27/2023] [Indexed: 03/15/2023] Open
Abstract
BackgroundHearing loss (HL) is one of the main medical complications for Turner Syndrome (TS) patients, with an earlier presentation and higher incidence than normal women. However, the etiology of HL in TS is unclear. The aim of this study was to investigate the hearing status of TS patients in China and the influencing factors, so as to provide a theoretical basis for early intervention treatment for TS patients with HL.MethodsIn total 46 female patients aged 14–32 diagnosed with TS received tympanic membrane and audiological examinations, including pure tone audiometry and tympanometry. In addition, the effects of karyotype, sex hormone levels, thyroid function, insulin, blood lipids, bone mineral density, age and other factors on hearing levels were analyzed, and the possible risk factors associated with HL in TS patients were explored.ResultsIn 9 patients (19.6%) had HL, including 1 (2.2%) with mild conductive hearing loss, 5 (10.9%) with mild sensorineural hearing loss, 3 (6.5%) with moderate sensorineural hearing loss. TS is often associated with age-related mid-frequency and high-frequency HL, and the incidence of HL increases with age. Compared with other karyotypes, patients with 45, X haplotype have an increased risk of mid-frequency HL.ConclusionsTherefore, karyotype may be a predictor of hearing problems in TS.
Collapse
Affiliation(s)
- Huijia Lin
- Department of Obstetrics and Gynecology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, China
| | - Xiaoya Wang
- Department of Ear, Nose, and Throat, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, China
| | - Shuang Qin
- Department of Obstetrics and Gynecology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, China
| | - Fanglan Luo
- Department of Obstetrics and Gynecology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, China
| | - Yingmei Cen
- Department of Obstetrics and Gynecology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, China
| | - Gendie E. Lash
- Guangzhou Institute of Pediatrics, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangdong Provincial Clinical Research Center for Child Health, Guangzhou, China
| | - Li Li
- Department of Obstetrics and Gynecology, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, China
- *Correspondence: Li Li
| |
Collapse
|
4
|
Reavis KM, Bisgaard N, Canlon B, Dubno JR, Frisina RD, Hertzano R, Humes LE, Mick P, Phillips NA, Pichora-Fuller MK, Shuster B, Singh G. Sex-Linked Biology and Gender-Related Research Is Essential to Advancing Hearing Health. Ear Hear 2023; 44:10-27. [PMID: 36384870 PMCID: PMC10234332 DOI: 10.1097/aud.0000000000001291] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
There is robust evidence that sex (biological) and gender (behavioral/social) differences influence hearing loss risk and outcomes. These differences are noted for animals and humans-in the occurrence of hearing loss, hearing loss progression, and response to interventions. Nevertheless, many studies have not reported or disaggregated data by sex or gender. This article describes the influence of sex-linked biology (specifically sex-linked hormones) and gender on hearing and hearing interventions, including the role of sex-linked biology and gender in modifying the association between risk factors and hearing loss, and the effects of hearing loss on quality of life and functioning. Most prevalence studies indicate that hearing loss begins earlier and is more common and severe among men than women. Intrinsic sex-linked biological differences in the auditory system may account, in part, for the predominance of hearing loss in males. Sex- and gender-related differences in the effects of noise exposure or cardiovascular disease on the auditory system may help explain some of these differences in the prevalence of hearing loss. Further still, differences in hearing aid use and uptake, and the effects of hearing loss on health may also vary by sex and gender. Recognizing that sex-linked biology and gender are key determinants of hearing health, the present review concludes by emphasizing the importance of a well-developed research platform that proactively measures and assesses sex- and gender-related differences in hearing, including in understudied populations. Such research focus is necessary to advance the field of hearing science and benefit all members of society.
Collapse
Affiliation(s)
- Kelly M Reavis
- VA RR&D National Center for Rehabilitative Auditory Research, VA Portland Health Care System, Portland, Oregon, USA.,OHSU-PSU School of Public Health, Oregon Health & Science University, Portland, Oregon, USA
| | | | - Barbara Canlon
- Department of Physiology and Pharmacology, Karolinska Institute, Stockholm, Sweden
| | - Judy R Dubno
- Department of Otolaryngology-Head and Neck Surgery, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Robert D Frisina
- Department of Medical Engineering and Communication Sciences & Disorders, University of South Florida, Tampa, Florida, USA
| | - Ronna Hertzano
- Department of Otorhinolaryngology Head and Neck Surgery, University of Maryland School of Medicine, Baltimore, Maryland, USA.,Department of Anatomy and Neurobiology, University of Maryland School of Medicine, Baltimore, Maryland, USA.,Institute for Genome Science, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Larry E Humes
- Department of Speech, Language and Hearing Sciences, Indiana University, Bloomington, Indiana, USA
| | - Paul Mick
- Department of Surgery, College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Natalie A Phillips
- Department of Psychology, Concordia University, Montréal, Québec, Canada
| | | | - Benjamin Shuster
- Department of Otorhinolaryngology Head and Neck Surgery, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | | |
Collapse
|
5
|
Özgedik D, Kirbaç A, Belgin E. Is there any difference in hearing function between surgical and natural menopause? Women Health 2022; 62:135-143. [DOI: 10.1080/03630242.2022.2029801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Dilek Özgedik
- Faculty of Health Sciences, Department of Speech Language Therapy, Lokman Hekim University, Ankara, Turkey
| | - Arzu Kirbaç
- Department of Audiology, Eskişehir Osmangazi University Faculty of Health Sciences, Ankara, Turkey
| | - Erol Belgin
- Faculty of Health Sciences, Department of Audiology, Medipol University, Ankara, Turkey
| |
Collapse
|
6
|
Lohi V, Ohtonen P, Sorri M, Mäki-Torkko E, Hannula S. The impact of cardiovascular diseases on hearing deterioration: a 13-year follow-up study. Int J Audiol 2021; 61:826-831. [PMID: 34751079 DOI: 10.1080/14992027.2021.1998838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
OBJECTIVE To study the impact of cardiovascular diseases (CVDs) on hearing deterioration among ageing adults in a longitudinal setting. Furthermore, to describe the pure tone threshold changes at the 0.125-8 kHz frequency range over 13 years. DESIGN A population-based follow-up study. STUDY SAMPLE A random sample of 850 adults, of whom 559 participated in the follow-up study. Otological examination, a structured interview, and pure tone audiometry were conducted. Multivariate regression models were used to estimate the effect of CVD (participants had at least one cardiovascular condition) on hearing deterioration of the better ear hearing level (BEHL), defined as a change in the pure-tone average (PTA) of the frequencies 0.5, 1, 2, and 4 kHz and separately at the lower (0.125, 0.25, and 0.5 kHz) and higher (4, 6, and 8 kHz) frequencies. RESULTS In the multivariable-adjusted analysis, the BEHL change at 13 years was 0.7 dB greater among participants with CVD (p = 0.3). The mean BEHL change during the 13-year follow-up was 12.0 dB (95% CI 11.4-12.6) among all participants. CONCLUSIONS No significant association between CVD and hearing threshold changes was found.
Collapse
Affiliation(s)
- Venla Lohi
- Department of Otorhinolaryngology and Head and Neck Surgery, Oulu University Hospital, Oulu, Finland.,PEDEGO Research Unit, University of Oulu, Oulu, Finland.,Medical Research Center Oulu, Oulu, Finland
| | - Pasi Ohtonen
- Division of Operative Care and Oulu University Hospital and Research Unit of Surgery, Anesthesia and Intensive care, University of Oulu, Oulu, Finland
| | - Martti Sorri
- PEDEGO Research Unit, University of Oulu, Oulu, Finland.,Medical Research Center Oulu, Oulu, Finland
| | - Elina Mäki-Torkko
- PEDEGO Research Unit, University of Oulu, Oulu, Finland.,Medical Research Center Oulu, Oulu, Finland.,Audiological Research Center, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
| | - Samuli Hannula
- Department of Otorhinolaryngology and Head and Neck Surgery, Oulu University Hospital, Oulu, Finland.,PEDEGO Research Unit, University of Oulu, Oulu, Finland.,Medical Research Center Oulu, Oulu, Finland
| |
Collapse
|
7
|
Zhang C, Li Q, Chen M, Lu T, Min S, Li S. The role of oxidative stress in the susceptibility of noise-impaired cochleae to synaptic loss induced by intracochlear electrical stimulation. Neuropharmacology 2021; 196:108707. [PMID: 34246683 DOI: 10.1016/j.neuropharm.2021.108707] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 06/15/2021] [Accepted: 07/06/2021] [Indexed: 11/20/2022]
Abstract
Intracochlear electrical stimulation (ES) generated by cochlear implants (CIs) is used to activate auditory nerves to restore hearing perception in deaf subjects and those with residual hearing who use electroacoustic stimulation (EAS) technology. Approximately 1/3 of EAS recipients experience loss of residual hearing a few months after ES activation, but the underlying mechanism is unknown. Clinical evidence indicates that the loss is related to the previous history of noise-induced hearing loss (NIHL). In this report, we investigated the impact of intracochlear ES on oxidative stress levels and synaptic counts in inner hair cells (IHCs) of the apical, middle and basal regions of guinea pigs with normal hearing (NH) and NIHL. Our results demonstrated that intracochlear ES with an intensity of 6 dB above the thresholds of electrically evoked compound action potentials (ECAPs) could induce the elevation of oxidative stress levels, resulting in a loss of IHC synapses near the electrodes in the basal and middle regions of the NH cochleae. Furthermore, the apical region of cochleae with NIHL were more susceptible to synaptic loss induced by relatively low-intensity ES than that of NH cochleae, resulting from the additional elevation of oxidative stress levels and the reduced antioxidant capability throughout the whole cochlea.
Collapse
Affiliation(s)
- Chen Zhang
- Department of Otolaryngology - Head and Neck Surgery, Eye & ENT Hospital of Fudan University, Shanghai, 200031, China; NHC Key Laboratory of Hearing Medicine, Shanghai, China
| | - Qiang Li
- Department of Otolaryngology - Head and Neck Surgery, Eye & ENT Hospital of Fudan University, Shanghai, 200031, China; NHC Key Laboratory of Hearing Medicine, Shanghai, China
| | - Min Chen
- Department of Otolaryngology - Head and Neck Surgery, Eye & ENT Hospital of Fudan University, Shanghai, 200031, China; NHC Key Laboratory of Hearing Medicine, Shanghai, China
| | - Tianhao Lu
- Department of Otolaryngology - Head and Neck Surgery, Eye & ENT Hospital of Fudan University, Shanghai, 200031, China; NHC Key Laboratory of Hearing Medicine, Shanghai, China
| | - Shiyao Min
- Department of Otolaryngology - Head and Neck Surgery, Eye & ENT Hospital of Fudan University, Shanghai, 200031, China; NHC Key Laboratory of Hearing Medicine, Shanghai, China
| | - Shufeng Li
- Department of Otolaryngology - Head and Neck Surgery, Eye & ENT Hospital of Fudan University, Shanghai, 200031, China; NHC Key Laboratory of Hearing Medicine, Shanghai, China.
| |
Collapse
|
8
|
Sex-based Differences in Hearing Loss: Perspectives From Non-clinical Research to Clinical Outcomess. Otol Neurotol 2021; 41:290-298. [PMID: 31789968 DOI: 10.1097/mao.0000000000002507] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
INTRODUCTION It is estimated over 466 million people worldwide have disabling hearing loss, and untreated hearing loss is associated with poorer health outcomes. The influence of sex as a biological variable on hearing loss is not well understood, especially for differences in underlying mechanisms which are typically elucidated through non-clinical research. Although the inclusion of sex as a biological variable in clinical studies has been required since 1993, sex reporting has only been recently mandated in National Institutes of Health funded non-clinical studies. OBJECTIVE This article reviews the literature on recent non-clinical and clinical research concerning sex-based differences in hearing loss primarily since 1993, and discusses implications for knowledge gaps in the translation from non-clinical to clinical realms. CONCLUSIONS The disparity between sex-based requirements for non-clinical versus clinical research may inhibit a comprehensive understanding of sex-based mechanistic differences. Such disparities may play a role in understanding and explaining clinically significant sex differences and are likely necessary for developing robust clinical treatment options.
Collapse
|
9
|
Li Q, Chen M, Zhang C, Lu T, Min S, Li S. Opposite Roles of NT-3 and BDNF in Synaptic Remodeling of the Inner Ear Induced by Electrical Stimulation. Cell Mol Neurobiol 2020; 41:1665-1682. [PMID: 32770528 DOI: 10.1007/s10571-020-00935-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Accepted: 08/01/2020] [Indexed: 12/11/2022]
Abstract
With the development of neural prostheses, neural plasticity including synaptic remodeling under electrical stimulation is drawing more and more attention. Indeed, intracochlear electrical stimulation used to restore hearing in deaf can induce the loss of residual hearing and synapses of the inner hair cells (IHCs). However, the mechanism under this process is largely unknown. Considering that the guinea pig is always a suitable and convenient choice for the animal model of cochlea implant (CI), in the present study, normal-hearing guinea pigs were implanted with CIs. Four-hour electrical stimulation with the intensity of 6 dB above electrically evoked compound action potential (ECAP) threshold (which can decrease the quantity of IHC synapses and the excitability of the auditory nerve) resulted in the upregulation of Bdnf (p < 0.0001) and downregulation of Nt-3 (p < 0.05). Intracochlear perfusion of exogenous NT-3 or TrkC/Fc (which blocks NT-3) can, respectively, resist or aggravate the synaptic loss induced by electrical stimulation. In contrast, local delivery of exogenous BDNF or TrkB/Fc (which blocks BDNF) to the cochlea, respectively, exacerbated or protected against the synaptic loss caused by electrical stimulation. Notably, the synaptic changes were only observed in the basal and middle halves of the cochlea. All the findings above suggested that NT-3 and BDNF may play opposite roles in the remodeling of IHC synapses induced by intracochlear electrical stimulation, i.e. NT-3 and BDNF promoted the regeneration and degeneration of IHC synapses, respectively.
Collapse
Affiliation(s)
- Qiang Li
- ENT Institute and Department of Otolaryngology, Eye & ENT Hospital, Fudan University, Shanghai, China.,NHC Key Laboratory of Hearing Medicine (Fudan University), Shanghai, China
| | - Min Chen
- ENT Institute and Department of Otolaryngology, Eye & ENT Hospital, Fudan University, Shanghai, China.,NHC Key Laboratory of Hearing Medicine (Fudan University), Shanghai, China
| | - Chen Zhang
- ENT Institute and Department of Otolaryngology, Eye & ENT Hospital, Fudan University, Shanghai, China.,NHC Key Laboratory of Hearing Medicine (Fudan University), Shanghai, China
| | - Tianhao Lu
- ENT Institute and Department of Otolaryngology, Eye & ENT Hospital, Fudan University, Shanghai, China.,NHC Key Laboratory of Hearing Medicine (Fudan University), Shanghai, China
| | - Shiyao Min
- ENT Institute and Department of Otolaryngology, Eye & ENT Hospital, Fudan University, Shanghai, China.,NHC Key Laboratory of Hearing Medicine (Fudan University), Shanghai, China
| | - Shufeng Li
- ENT Institute and Department of Otolaryngology, Eye & ENT Hospital, Fudan University, Shanghai, China. .,NHC Key Laboratory of Hearing Medicine (Fudan University), Shanghai, China.
| |
Collapse
|
10
|
Nolan LS. Age-related hearing loss: Why we need to think about sex as a biological variable. J Neurosci Res 2020; 98:1705-1720. [PMID: 32557661 DOI: 10.1002/jnr.24647] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2019] [Revised: 04/28/2020] [Accepted: 04/28/2020] [Indexed: 12/12/2022]
Abstract
It has long been known that age-related hearing loss (ARHL) is more common, more severe, and with an earlier onset in men compared to women. Even in the absence of confounding factors such as noise exposure, these sexdifferences in susceptibility to ARHL remain. In the last decade, insight into the pleiotrophic nature by which estrogen signaling can impact multiple signaling mechanisms to mediate downstream changes in gene expression and/or elicit rapid changes in cellular function has rapidly gathered pace, and a role for estrogen signaling in the biological pathways that confer neuroprotection is becoming undeniable. Here I review the evidence why we need to consider sex as a biological variable (SABV) when investigating the etiology of ARHL. Loss of auditory function with aging is frequency-specific and modulated by SABV. Evidence also suggests that differences in cochlear physiology between women and men are already present from birth. Understanding the molecular basis of these sex differences in ARHL will accelerate the development of precision medicine therapies for ARHL.
Collapse
Affiliation(s)
- Lisa S Nolan
- Wolfson Centre for Age-Related Diseases, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK
| |
Collapse
|
11
|
Armstrong NM, Espeland MA, Chen JC, Masaki K, Wactawski-Wende J, Li W, Gass MLS, Stefanick ML, Manson JE, Deal JA, Rapp SR, Lin FR, Resnick SM. Associations of Hearing Loss and Menopausal Hormone Therapy With Change in Global Cognition and Incident Cognitive Impairment Among Postmenopausal Women. J Gerontol A Biol Sci Med Sci 2020; 75:537-544. [PMID: 31326978 PMCID: PMC7205420 DOI: 10.1093/gerona/glz173] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Hearing loss (HL) and menopausal hormone therapy (conjugated equine estrogens [CEE] and/or medroxyprogesterone acetate [MPA]) are separately associated with cognitive decline and increased risk of incident cognitive impairment. Joint effects of HL and HT could be associated with additive or synergistic decline in global cognition and risk of incident cognitive impairment among postmenopausal women. METHODS Using the Women's Health Initiative (WHI) Memory Study, 7,220 postmenopausal women with measures of HL, global cognition (Modified Mini-Mental State Examination score), and cognitive impairment (centrally adjudicated diagnoses of mild cognitive impairment and dementia) from 1996 to 2009. Multivariable linear mixed-effects models were used to analyze rate of change in global cognition. Accelerated failure time models were used to evaluate time to incident cognitive impairment, stratified by HT. RESULTS Within the CEE-Alone trial, observed adverse effects of CEE-Alone on change in global cognition did not differ by HL, and estimated joint effects of HL and CEE-Alone were not associated with incident cognitive impairment. Within the CEE+MPA trial, while HL did not independently accelerate time to cognitive impairment, the adverse effect of CEE+MPA on global cognition was heightened in older women with HL. Older women on CEE+MPA either with HL (time ratio [TR] = 0.82, 95% confidence interval [CI]: 0.71, 0.94) or with normal hearing (TR = 0.86, 95% CI: 0.76, 0.97) had faster time to cognitive impairment than those with normal hearing and placebo. CONCLUSIONS HL may accentuate the adverse effect of CEE+MPA, not CEE-Alone, on global cognitive decline, not incident cognitive impairment, among postmenopausal women on HT.
Collapse
Affiliation(s)
- Nicole M Armstrong
- Laboratory of Behavioral Neuroscience, National Institute of Aging, Baltimore, Maryland
| | - Mark A Espeland
- Department of Biostatistics and Data Science, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Jiu-Chiuan Chen
- Department of Preventive Medicine and Neurology, Keck School of Medicine of University of Southern California, Los Angeles, California
| | - Kamal Masaki
- Department of Geriatric Medicine, John A. Burns School of Medicine, University of Hawai`i Manoa, Honolulu, Hawaii
| | - Jean Wactawski-Wende
- Department of Epidemiology and Environmental Health, School of Public Health and Health Professions, University of Buffalo, New York
| | - Wenjun Li
- Department of Medicine, University of Massachusetts Medical School, Worcester, Massachusetts
| | - Margery L S Gass
- Department of Obstetrics & Gynecology, University of Cincinnati, Cincinnati, Ohio
| | - Marcia L Stefanick
- Department of Medicine, Stanford University School of Medicine, Stanford, California
- Obstetrics and Gynecology, Stanford University School of Medicine, Stanford, California
- Health Research and Policy, Stanford Prevention Research Center, Stanford University School of Medicine, Stanford, California
| | - JoAnn E Manson
- Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, Massachusetts
- Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts
| | - Jennifer A Deal
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
- Cochlear Center for Hearing and Public Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Stephen R Rapp
- Department of Psychiatry and Behavioral Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Frank R Lin
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
- Cochlear Center for Hearing and Public Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland
- Department of Mental Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
| | - Susan M Resnick
- Laboratory of Behavioral Neuroscience, National Institute of Aging, Baltimore, Maryland
| |
Collapse
|
12
|
Calabro KR, Boye SL, Choudhury S, Fajardo D, Peterson JJ, Li W, Crosson SM, Kim MJ, Ding D, Salvi R, Someya S, Boye SE. A Novel Mouse Model of MYO7A USH1B Reveals Auditory and Visual System Haploinsufficiencies. Front Neurosci 2019; 13:1255. [PMID: 31824252 PMCID: PMC6883748 DOI: 10.3389/fnins.2019.01255] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 11/05/2019] [Indexed: 12/20/2022] Open
Abstract
Usher’s syndrome is the most common combined blindness–deafness disorder with USH1B, caused by mutations in MYO7A, resulting in the most severe phenotype. The existence of numerous, naturally occurring shaker1 mice harboring variable MYO7A mutations on different genetic backgrounds has complicated the characterization of MYO7A knockout (KO) and heterozygote mice. We generated a novel MYO7A KO mouse (Myo7a–/–) that is easily genotyped, maintained, and confirmed to be null for MYO7A in both the eye and inner ear. Like USH1B patients, Myo7a–/– mice are profoundly deaf, and display near complete loss of inner and outer cochlear hair cells (HCs). No gross structural changes were observed in vestibular HCs. Myo7a–/– mice exhibited modest declines in retinal function but, unlike patients, no loss of retinal structure. We attribute the latter to differential expression of MYO7A in mouse vs. primate retina. Interestingly, heterozygous Myo7a+/– mice had reduced numbers of cochlear HCs and concomitant reductions in auditory function relative to Myo7a+/+ controls. Notably, this is the first report that loss of a single Myo7a allele significantly alters auditory structure and function and suggests that audiological characterization of USH1B carriers is warranted. Maintenance of vestibular HCs in Myo7a–/– mice suggests that gene replacement could be used to correct the vestibular dysfunction in USH1B patients. While Myo7a–/– mice do not exhibit sufficiently robust retinal phenotypes to be used as a therapeutic outcome measure, they can be used to assess expression of vectored MYO7A on a null background and generate valuable pre-clinical data toward the treatment of USH1B.
Collapse
Affiliation(s)
- Kaitlyn R Calabro
- Department of Ophthalmology, University of Florida, Gainesville, FL, United States
| | - Sanford L Boye
- Department of Pediatrics, University of Florida, Gainesville, FL, United States
| | - Shreyasi Choudhury
- Department of Ophthalmology, University of Florida, Gainesville, FL, United States
| | - Diego Fajardo
- Department of Ophthalmology, University of Florida, Gainesville, FL, United States
| | - James J Peterson
- Department of Ophthalmology, University of Florida, Gainesville, FL, United States
| | - Wei Li
- Department of Ophthalmology, University of Florida, Gainesville, FL, United States
| | - Sean M Crosson
- Department of Ophthalmology, University of Florida, Gainesville, FL, United States
| | - Mi-Jung Kim
- Department of Aging and Geriatric Research, University of Florida, Gainesville, FL, United States
| | - Dalian Ding
- Department of Communicative Disorders and Sciences, The State University of New York at Buffalo, Buffalo NY, United States
| | - Richard Salvi
- Department of Communicative Disorders and Sciences, The State University of New York at Buffalo, Buffalo NY, United States
| | - Shinichi Someya
- Department of Aging and Geriatric Research, University of Florida, Gainesville, FL, United States
| | - Shannon E Boye
- Department of Ophthalmology, University of Florida, Gainesville, FL, United States
| |
Collapse
|
13
|
Karaer I, Tuncay G. The effect of premature ovarian failure on inner ear function. J OBSTET GYNAECOL 2019; 40:247-251. [PMID: 31340701 DOI: 10.1080/01443615.2019.1621815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
The aim of this study was to test whether hearing function is impaired in women with premature ovarian failure. Thirty (30) women with premature ovarian failure (POF), 30 women in menopause and 30 healthy controls were recruited in this study. Pure tone audiometric (PTA), transiently evoked otoacoustic emissions (TEOAEs) and distortion product otoacoustic emissions (DPOAEs) of the study participants were analysed. At PTA, 6 and 8 kHz were lower in menopause group compared with both women with POF and controls. At TEOAE 3 and 4 kHz and at DPOAE 1, 2, 4 and 6 kHz were lower in menopause group compared with the controls. At DPOAE 6 kHz was lower in the POF group compared with the controls. Women with POF comparing to menopause group at TEOAE 3, 4 kHz and at DPOAE 4 and 6 kHz were lower in the menopause group. Inner ear function of both women in menopause and women with POF was declined compared to the healthy controls. Clinically, evaluation of hearing status may be considered in women with POF.Impact statementWhat is already known on this subject: Premature ovarian failure (POF) affects 1%-2% of women, and it adversely effects on health status (such as cardiovascular, psychological and cognitive disorders). Previous studies suggested that a lack of oestrogen might play a role in hearing disorders in women. However, we do not know POF's adversely effect on cochlea and hearing.What the results of this study add: The present study demonstrates that lower serum oestrogen has a negative effect hearing in women with POF at DPOAE 6 kHz.What the implications are of these findings for clinical practice and/or further research: The women with POF must be evaluated for hearing status.
Collapse
Affiliation(s)
- Isil Karaer
- Ministry of Health, ENT Clinic, Malatya Training and Research Hospital, Malatya, Turkey
| | - Gorkem Tuncay
- Department of Obstetrics and Gynecology, Division of Reproductive Endocrinology and Infertility, Inonu University Medical School of Medicine, Malatya, Turkey
| |
Collapse
|
14
|
Diao H, Zhao L, Qin L, Bai W, Wang K, Zhang J, Chen X, Jiang H, Mao L. Lower expression of prestin and MYO7A correlates with menopause-associated hearing loss. Climacteric 2019; 22:361-369. [PMID: 30612476 DOI: 10.1080/13697137.2018.1547698] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- H. Diao
- Peking University Ninth School of Clinical Medicine, Beijing Shi, China
| | - L. Zhao
- Chinese PLA General Hospital, Beijing Shi, China
| | - L. Qin
- Peking University Health Science Centre, Beijing Shi, China
| | - W. Bai
- Peking University Ninth School of Clinical Medicine, Beijing Shi, China
| | - K. Wang
- Peking University Health Science Centre, Beijing Shi, China
| | - J. Zhang
- Peking University Ninth School of Clinical Medicine, Beijing Shi, China
| | - X. Chen
- Peking University First Hospital, Beijing Shi, China
| | - H. Jiang
- Peking University Health Science Centre, Beijing Shi, China
| | - L. Mao
- Peking University First Hospital, Beijing Shi, China
| |
Collapse
|
15
|
|
16
|
Stute P. Hörvermögen in den Wechseljahren. GYNAKOLOGISCHE ENDOKRINOLOGIE 2018. [DOI: 10.1007/s10304-018-0192-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
17
|
Abstract
The 2017 Hormone Therapy Position Statement of The North American Menopause Society (NAMS) updates the 2012 Hormone Therapy Position Statement of The North American Menopause Society and identifies future research needs. An Advisory Panel of clinicians and researchers expert in the field of women's health and menopause was recruited by NAMS to review the 2012 Position Statement, evaluate new literature, assess the evidence, and reach consensus on recommendations, using the level of evidence to identify the strength of recommendations and the quality of the evidence. The Panel's recommendations were reviewed and approved by the NAMS Board of Trustees.Hormone therapy (HT) remains the most effective treatment for vasomotor symptoms (VMS) and the genitourinary syndrome of menopause (GSM) and has been shown to prevent bone loss and fracture. The risks of HT differ depending on type, dose, duration of use, route of administration, timing of initiation, and whether a progestogen is used. Treatment should be individualized to identify the most appropriate HT type, dose, formulation, route of administration, and duration of use, using the best available evidence to maximize benefits and minimize risks, with periodic reevaluation of the benefits and risks of continuing or discontinuing HT.For women aged younger than 60 years or who are within 10 years of menopause onset and have no contraindications, the benefit-risk ratio is most favorable for treatment of bothersome VMS and for those at elevated risk for bone loss or fracture. For women who initiate HT more than 10 or 20 years from menopause onset or are aged 60 years or older, the benefit-risk ratio appears less favorable because of the greater absolute risks of coronary heart disease, stroke, venous thromboembolism, and dementia. Longer durations of therapy should be for documented indications such as persistent VMS or bone loss, with shared decision making and periodic reevaluation. For bothersome GSM symptoms not relieved with over-the-counter therapies and without indications for use of systemic HT, low-dose vaginal estrogen therapy or other therapies are recommended.This NAMS position statement has been endorsed by Academy of Women's Health, American Association of Clinical Endocrinologists, American Association of Nurse Practitioners, American Medical Women's Association, American Society for Reproductive Medicine, Asociación Mexicana para el Estudio del Climaterio, Association of Reproductive Health Professionals, Australasian Menopause Society, Chinese Menopause Society, Colegio Mexicano de Especialistas en Ginecologia y Obstetricia, Czech Menopause and Andropause Society, Dominican Menopause Society, European Menopause and Andropause Society, German Menopause Society, Groupe d'études de la ménopause et du vieillissement Hormonal, HealthyWomen, Indian Menopause Society, International Menopause Society, International Osteoporosis Foundation, International Society for the Study of Women's Sexual Health, Israeli Menopause Society, Japan Society of Menopause and Women's Health, Korean Society of Menopause, Menopause Research Society of Singapore, National Association of Nurse Practitioners in Women's Health, SOBRAC and FEBRASGO, SIGMA Canadian Menopause Society, Società Italiana della Menopausa, Society of Obstetricians and Gynaecologists of Canada, South African Menopause Society, Taiwanese Menopause Society, and the Thai Menopause Society. The American College of Obstetricians and Gynecologists supports the value of this clinical document as an educational tool, June 2017. The British Menopause Society supports this Position Statement.
Collapse
|
18
|
Yang B, Wong E, Ho WH, Lau C, Chan YS, Wu EX. Reduction of sound-evoked midbrain responses observed by functional magnetic resonance imaging following acute acoustic noise exposure. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2018; 143:2184. [PMID: 29716239 DOI: 10.1121/1.5030920] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Short duration and high intensity acoustic exposures can lead to temporary hearing loss and auditory nerve degeneration. This study investigates central auditory system function following such acute exposures after hearing loss recedes. Adult rats were exposed to 100 dB sound pressure level noise for 15 min. Auditory brainstem responses (ABRs) were recorded with click sounds to check hearing thresholds. Functional magnetic resonance imaging (fMRI) was performed with tonal stimulation at 12 and 20 kHz to investigate central auditory changes. Measurements were performed before exposure (0D), 7 days after (7D), and 14 days after (14D). ABRs show an ∼6 dB threshold shift shortly after exposure, but no significant threshold differences between 0D, 7D, and 14D. fMRI responses are observed in the lateral lemniscus (LL) and inferior colliculus (IC) of the midbrain. In the IC, responses to 12 kHz are 3.1 ± 0.3% (0D), 1.9 ± 0.3% (7D), and 2.9 ± 0.3% (14D) above the baseline magnetic resonance imaging signal. Responses to 20 kHz are 2.0 ± 0.2% (0D), 1.4 ± 0.2% (7D), and 2.1 ± 0.2% (14D). For both tones, responses at 7D are less than those at 0D (p < 0.01) and 14D (p < 0.05). In the LL, similar trends are observed. Acute exposure leads to functional changes in the auditory midbrain with timescale of weeks.
Collapse
Affiliation(s)
- Bin Yang
- Department of Physics, The City University of Hong Kong, Hong Kong, People's Republic of China
| | - Eddie Wong
- Department of Physics, The City University of Hong Kong, Hong Kong, People's Republic of China
| | - Wai Hong Ho
- Department of Physics, The City University of Hong Kong, Hong Kong, People's Republic of China
| | - Condon Lau
- Department of Physics, The City University of Hong Kong, Hong Kong, People's Republic of China
| | - Ying Shing Chan
- School of Biomedical Sciences, The University of Hong Kong, Hong Kong, People's Republic of China
| | - Ed X Wu
- Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong, People's Republic of China
| |
Collapse
|
19
|
Zhang J, Zhang T, Yu L, Ruan Q, Yin L, Liu D, Zhang H, Bai W, Ren Z. Effects of ovarian reserve and hormone therapy on hearing in premenopausal and postmenopausal women: A cross-sectional study. Maturitas 2018; 111:77-81. [PMID: 29673835 DOI: 10.1016/j.maturitas.2018.01.019] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2017] [Revised: 12/24/2017] [Accepted: 01/20/2018] [Indexed: 11/24/2022]
Abstract
OBJECTIVES To observe the hearing function around menopause, to analyze the effects of ovarian reserve and hormone therapy on hearing, and to study factors related to hearing loss among women around menopause. STUDY DESIGN In this cross-sectional study, we evaluated 109 women around menopause aged 45-55 years, including 40 women with ovarian failure, 48 with ovarian non-failure, and 21 receiving hormone therapy. All women underwent an audiologic evaluation, and hormone blood testing was performed. The general condition, reproductive history, medical history, lifestyle, and menopausal symptoms were collected through a questionnaire. MAIN OUTCOME MEASURE The auditory threshold and anti-Mullerian hormone level. RESULTS Women in the ovarian failure group presented with a decreased hearing level in all frequency bands compared with those in the ovarian non-failure group; the significant differences occurred at 8000 Hz, 10 000 Hz, 12 500 Hz, and 16 000 Hz in the right-ear air conduction. The auditory threshold was lower in the hormone therapy group than in the ovarian failure group, but the difference was statistically significant only in the right-ear air conduction at 10 000 Hz. There were two risk factors for hearing loss: an anti-Mullerian hormone level <0.01 ng/mL (odds ratio [OR] = 2.624) and frequent earphone use (OR = 3.846). CONCLUSIONS A decline in ovarian function is associated with hearing loss in women, especially in relation to extended high-frequency air conduction of the right ear. Preserving ovarian function and reducing earphone use are important measures to protect women's hearing. However, the effect of hormone therapy on hearing requires further investigation.
Collapse
Affiliation(s)
- Jingfei Zhang
- Department of Obstetrics and Gynecology, Beijing Shijitan Hospital, Capital Medical University, Beijing, China
| | - Tingyue Zhang
- Department of Clinical Medicine, Xiangya School of Medicine, Central South University, Hunan, China
| | - Lisheng Yu
- Department of Otorhinolaryngology, Peking University People's Hospital, Beijing, China
| | - Qianying Ruan
- Department of Audiology, Beijing Shijitan Hospital, Capital Medical University, Beijing, China
| | - Lingxue Yin
- Department of Audiology, Beijing Shijitan Hospital, Capital Medical University, Beijing, China
| | - Dong Liu
- Department of Life Science, Peking University, Beijing, China
| | - Haicheng Zhang
- Department of Cardiology, Peking University People's Hospital, Beijing, China
| | - Wenpei Bai
- Department of Obstetrics and Gynecology, Beijing Shijitan Hospital, Capital Medical University, Beijing, China.
| | - Zhenghong Ren
- Department of Public Health, Peking University, Beijing, China
| |
Collapse
|
20
|
Hu XJ, Li FF, Wang Y, Lau CC. Effects of cisplatin on the auditory function of ovariectomized rats with estrogen deficiency. Acta Otolaryngol 2017; 137:606-610. [PMID: 27905208 DOI: 10.1080/00016489.2016.1261409] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
CONCLUSION The ovariectomy in rats does not change their auditory function. However, combining ovariectomy with Cisplatin treatment increases the risk of damaging the auditory function relative to the ototoxic effect caused by Cisplatin alone or ovariectomy alone. OBJECTIVES The auditory benefit from estrogen depends on a number of factors that make findings among studies controversial. The present study was to examine the impact of Cisplatin, a chemotherapy drug, on the auditory function of ovariectomized rats. METHODS Thirty-two female rats were assigned to three groups (OVX + C, OVX - C, Sham + C). The rats in the OVX + C and OVX - C groups received bilateral ovariectomy, and those in the Sham + C group received a sham surgery with intact ovaries. After 6 weeks the rats in the OVX + C and Sham + C groups were then treated with Cisplatin for 4 days, but not those in the OVX - C group (control). The auditory function was measured with DPOAE SNRs and ABR thresholds before the surgery and after the Cisplatin treatment. RESULTS The OVX + C group had significantly decreased the DPOAE SNRs and increased the ABR thresholds relative to the Sham + C group at stimulus frequencies between 2-8 kHz, and the Sham + C group also had worse auditory function than the OVX - C group.
Collapse
Affiliation(s)
- Xu-Jun Hu
- College of Medical Technology, Zhejiang Chinese Medical University, Hangzhou, PR China
| | - Fang-Fang Li
- College of Medical Technology, Zhejiang Chinese Medical University, Hangzhou, PR China
| | - Ying Wang
- College of Medical Technology, Zhejiang Chinese Medical University, Hangzhou, PR China
| | | |
Collapse
|