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Bakay WMH, Cervantes B, Lao-Rodríguez AB, Johannesen PT, Lopez-Poveda EA, Furness DN, Malmierca MS. How 'hidden hearing loss' noise exposure affects neural coding in the inferior colliculus of rats. Hear Res 2024; 443:108963. [PMID: 38308936 DOI: 10.1016/j.heares.2024.108963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/29/2023] [Revised: 01/15/2024] [Accepted: 01/20/2024] [Indexed: 02/05/2024]
Abstract
Exposure to brief, intense sound can produce profound changes in the auditory system, from the internal structure of inner hair cells to reduced synaptic connections between the auditory nerves and the inner hair cells. Moreover, noisy environments can also lead to alterations in the auditory nerve or to processing changes in the auditory midbrain, all without affecting hearing thresholds. This so-called hidden hearing loss (HHL) has been shown in tinnitus patients and has been posited to account for hearing difficulties in noisy environments. However, much of the neuronal research thus far has investigated how HHL affects the response characteristics of individual fibres in the auditory nerve, as opposed to higher stations in the auditory pathway. Human models show that the auditory nerve encodes sound stochastically. Therefore, a sufficient reduction in nerve fibres could result in lowering the sampling of the acoustic scene below the minimum rate necessary to fully encode the scene, thus reducing the efficacy of sound encoding. Here, we examine how HHL affects the responses to frequency and intensity of neurons in the inferior colliculus of rats, and the duration and firing rate of those responses. Finally, we examined how shorter stimuli are encoded less effectively by the auditory midbrain than longer stimuli, and how this could lead to a clinical test for HHL.
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Affiliation(s)
- Warren M H Bakay
- Cognitive and Auditory Neuroscience Laboratory, Institute of Neuroscience of Castilla y León (INCYL), University of Salamanca, Spain; Institute for Biomedical Research of Salamanca, Salamanca, Spain
| | - Blanca Cervantes
- Cognitive and Auditory Neuroscience Laboratory, Institute of Neuroscience of Castilla y León (INCYL), University of Salamanca, Spain; Institute of Neuroscience of Castilla y León (INCYL), University of Salamanca, Spain; School of Medicine, University Anáhuac Puebla, Mexico
| | - Ana B Lao-Rodríguez
- Cognitive and Auditory Neuroscience Laboratory, Institute of Neuroscience of Castilla y León (INCYL), University of Salamanca, Spain; Institute of Neuroscience of Castilla y León (INCYL), University of Salamanca, Spain; Institute for Biomedical Research of Salamanca, Salamanca, Spain
| | - Peter T Johannesen
- Institute of Neuroscience of Castilla y León (INCYL), University of Salamanca, Spain; Institute for Biomedical Research of Salamanca, Salamanca, Spain
| | - Enrique A Lopez-Poveda
- Institute of Neuroscience of Castilla y León (INCYL), University of Salamanca, Spain; Institute for Biomedical Research of Salamanca, Salamanca, Spain; Department of Surgery, Faculty of Medicine, University of Salamanca, Spain
| | - David N Furness
- School of Life Sciences, Keele University, Keele, United Kingdom
| | - Manuel S Malmierca
- Cognitive and Auditory Neuroscience Laboratory, Institute of Neuroscience of Castilla y León (INCYL), University of Salamanca, Spain; Institute of Neuroscience of Castilla y León (INCYL), University of Salamanca, Spain; Institute for Biomedical Research of Salamanca, Salamanca, Spain; Department of Biology and Pathology, Faculty of Medicine, University of Salamanca, Spain.
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Benet N, Kumar V, Sharma M, Gurwan B. Effect of Valsalva Maneuver by Heavy Weight Lifters on Ear and Its Attributes. Indian J Otolaryngol Head Neck Surg 2023; 75:535-540. [PMID: 37206737 PMCID: PMC10188837 DOI: 10.1007/s12070-023-03635-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Accepted: 02/23/2023] [Indexed: 03/09/2023] Open
Abstract
It is observed that people hold their breath while heavy weight lifting to get extra strength. Holding the breath during weight lifting can lead to abnormal increase in middle ear pressure which can lead to several hearing/auditory complications. The objective of the study was to investigate the impact of heavy weightlifting on various parameters related to ears like blocking sensation, tinnitus, vertigo, headache and temporary threshold shift across light and heavy weightlifters, as amateur weightlifting among youth is rapidly increasing. A cross-sectional survey design was used in this study. Based on the random sampling strategy, 40 participants in the age range of were selected across various gyms in Gurgaon India. The participants were equally divided into two categories; light weigh-lifters (LWL) who lifted half of the body weight and heavy weightlifters (HWL) who lifted equal or more than the body weight. A questionnaire was developed, validated and administered which consists of 23 questions targeting blocking sensation, tinnitus, vertigo, temporary threshold shift and headache. Chi-square analysis revealed that higher proportion of HWL group experienced blocking sensation (65% vs 25%), tinnitus (70% vs 35%), vertigo (75% vs 40%), headache (80% vs 35%), and temporary threshold shift (60% vs 35%) then the LWL group. Strenuous exercises like heavy weight lifting can lead to various ear problems such as blocking sensation, temporary threshold shift, tinnitus, and vertigo, which, may lead to hearing loss.
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Affiliation(s)
- Neelesh Benet
- Department of Audiology and Speech-Language Pathology, Amity University, Gurgaon, Haryana India
| | - Vijay Kumar
- Department of Audiology and Speech-Language Pathology, Amity University, Gurgaon, Haryana India
| | - Muskan Sharma
- Department of Audiology and Speech-Language Pathology, Amity University, Gurgaon, Haryana India
| | - Bhavya Gurwan
- Department of Audiology and Speech-Language Pathology, Amity University, Gurgaon, Haryana India
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Tzelnick S, Mizrachi A, Barkan N, Shivatzki S, Yosefof E, Hikri E, Attias J, Hilly O. The protective effect of aspirin-induced temporary threshold shift in an animal model of cisplatin-related ototoxicity. J Cancer Res Clin Oncol 2022; 149:2009-2016. [PMID: 35773430 DOI: 10.1007/s00432-022-04144-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Accepted: 06/13/2022] [Indexed: 10/17/2022]
Abstract
PURPOSE The purpose of this study was to evaluate whether induction of temporary threshold shift (TTS) with aspirin prior to cisplatin exposure can prevent or minimize cisplatin detrimental effects on hearing. METHODS We randomly divided BALB mice into three groups: (1) cisplatin only, (2) aspirin only, and (3) combined aspirin/cisplatin. Cisplatin was administered as a single intraperitoneal injection of 14 mg/kg. Aspirin was administered for three weeks via intraperitoneal injection of 200 mg/kg sodium salicylate, twice daily. Air conduction thresholds were recorded using Auditory Brainstem Responses (ABR). Cochleae were harvested and cochlear hair cells were counted using a scanning electron microscope (SEM). RESULTS Aspirin-induced TTS have reached an average of 30.05±16.9 dB after 2 weeks. At 60 days, cisplatin-only treated mice experienced an average threshold shifts of 50.7 dB at 4 kHz, 35.16 dB at 8 kHz, 70 dB at 16 kHz, 53.1 dB at 32 kHz. All threshold shifts were significantly worse than for cisplatin/aspirin treated mice with TTS of 11.85 dB at 4 kHz, 3.58 dB at 8 kHz, 16.58 dB at 16 kHz, 20.41 dB at 32 kHz (p < 0.01). Cochlear cell count with SEM has shown reduction in the number of both inner and outer hair cells in the mid-turn in cisplatin treated mice. CONCLUSION Aspirin induced TTS can protect from cisplatin-induced ototoxicity. This beneficial effect was demonstrated by auditory thresholds as well as SEM. Larger pre-clinical and clinical studies are still needed to confirm these findings.
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Affiliation(s)
- Sharon Tzelnick
- Department of Otorhinolaryngology Head and Neck Surgery, Rabin Medical Center, 39 Jabotinsky St, Petah Tikva, Israel. .,Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
| | - Aviram Mizrachi
- Department of Otorhinolaryngology Head and Neck Surgery, Rabin Medical Center, 39 Jabotinsky St, Petah Tikva, Israel.,Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Neta Barkan
- Institute of Audiology and Clinical Neurophysiology, Schneider Children's Medical Center of Israel, Petach Tikva, Israel
| | - Shaked Shivatzki
- Department of Otorhinolaryngology Head and Neck Surgery, Rabin Medical Center, 39 Jabotinsky St, Petah Tikva, Israel.,Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Eyal Yosefof
- Department of Otorhinolaryngology Head and Neck Surgery, Rabin Medical Center, 39 Jabotinsky St, Petah Tikva, Israel.,Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Elad Hikri
- Department of Otorhinolaryngology Head and Neck Surgery, Rabin Medical Center, 39 Jabotinsky St, Petah Tikva, Israel.,Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Joseph Attias
- Institute of Audiology and Clinical Neurophysiology, Schneider Children's Medical Center of Israel, Petach Tikva, Israel.,Department of Communications Sciences and Disorders, Haifa University, Haifa, Israel
| | - Ohad Hilly
- Department of Otorhinolaryngology Head and Neck Surgery, Rabin Medical Center, 39 Jabotinsky St, Petah Tikva, Israel.,Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
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Campbell KCM, Cosenza N, Meech R, Buhnerkempe M, Qin J, Rybak L, Fox DJ. D-methionine immediate and continued rescue after noise exposure does not prevent temporary threshold shift but alters cochlear and serum antioxidant levels. Int J Audiol 2021; 61:769-777. [PMID: 34369249 DOI: 10.1080/14992027.2021.1959659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
OBJECTIVE Determine if D-methionine (D-met) rescue prevents temporary threshold shift (TTS) from steady-state or impulse noise and determine D-met's impact on serum and cochlear antioxidant levels. DESIGN D-met at 50, 100 or 200 mg/kg/doses were administered 0, 6 and 18 hours-post noise. ABRs at baseline and 24 hours post-noise measured TTS. Serum (SOD, CAT, GR, GPx) and cochlear (GSH, GSSG) antioxidant levels measured physiological influence. Three control groups, with impulse or steady-state or without noise, were saline-injected. STUDY SAMPLE Ten Chinchillas/group. RESULTS D-met rescue did not significantly reduce TTS or impact serum CAT, SOD, GPx or GR levels vs. noise-exposed control groups, but TTS was greater in all groups relative to no-noise controls. D-met significantly elevated CAT at 50 mg/kg vs. steady-state controls and SOD at 200 mg/kg vs. impulse noise controls. D-met significantly reduced cochlear GSH/GSSG ratios in the 100 mg/kg D-met group vs. impulse noise controls. CONCLUSIONS While D-met rescue has reduced permanent threshold shift in previous studies, it did not reduce TTS in this study. However, D-met rescue did alter selective serum and cochlear oxidative state changes 24 hours post-noise relative to controls. Results demonstrate TTS studies do not always predict PTS protection in otoprotectant experimental designs.
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Affiliation(s)
- Kathleen C M Campbell
- Department of Medical Microbiology, Immunology, and Cell Biology, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - Nicole Cosenza
- Department of Medical Microbiology, Immunology, and Cell Biology, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - Robert Meech
- Department of Medical Microbiology, Immunology, and Cell Biology, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - Michael Buhnerkempe
- Department of Internal Medicine, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - Jun Qin
- Department of Computer and Electrical Engineering, Southern Illinois University Carbondale, Carbondale, IL, USA
| | - Leonard Rybak
- Department of Otolaryngology, Southern Illinois University School of Medicine, Springfield, IL, USA
| | - Daniel J Fox
- Department of Clinical Research, Springfield Clinic, Springfield, IL, USA
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Fehrenbacher K, Apel C, Bertsch D, van der Giet MS, van der Giet S, Grass M, Gschwandtl C, Heussen N, Hundt N, Kühn C, Morrison A, Müller-Ost M, Müller-Tarpet M, Porath S, Risse J, Schmitz S, Schöffl V, Timmermann L, Wernitz K, Küpper T. Temporary threshold shift after noise exposure in hypobaric hypoxia at high altitude: results of the ADEMED expedition 2011. Int Arch Occup Environ Health 2021; 94:1191-1199. [PMID: 34023963 PMCID: PMC8292300 DOI: 10.1007/s00420-021-01715-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Accepted: 08/29/2020] [Indexed: 11/30/2022]
Abstract
OBJECTIVES To evaluate whether there is an increased risk for noise-induced hearing loss at high altitude rsp. in hypobaric hypoxia. METHODS Thirteen volunteers got standard audiometry at 125, 250, 500, 750, 1000, 1500, 2000, 3000, 4000, 6000, and 8000 Hz before and after 10 min of white noise at 90 dB. The system was calibrated for the respective altitude. Measurements were performed at Kathmandu (1400 m) and at Gorak Shep (5300 m) (Solo Khumbu/Nepal) after 10 days of acclimatization while on trek. Temporary threshold shift (TTS) was analyzed by descriptive statistics and by factor analysis. RESULTS TTS is significantly more pronounced at high altitudes. Acclimatization does not provide any protection of the inner ear, although it increases arterial oxygen saturation. CONCLUSION The thresholds beyond which noise protection is recommended (> 80 dB) or necessary (> 85 dB) are not sufficient at high altitudes. We suggest providing protective devices above an altitude of 1500 m ("ear threshold altitude") when noise level is higher than 75 dB and using them definitively above 80 dB. This takes the individual reaction on hypobaric hypoxia at high altitude into account.
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Affiliation(s)
- K Fehrenbacher
- Institute of Occupational and Social Medicine, RWTH Aachen Technical University, Pauwelsstr. 30, 52074, Aachen, Germany
| | - C Apel
- Department of Dental Preservation, Parodontology and Preventive Dentistry, RWTH Aachen Technical University, Aachen, Germany
| | - D Bertsch
- Department of Cardiology, Catholic Hospital Marienhof, Koblenz, Germany
| | - M S van der Giet
- Institute of Occupational and Social Medicine, RWTH Aachen Technical University, Pauwelsstr. 30, 52074, Aachen, Germany
| | - S van der Giet
- Institute of Occupational and Social Medicine, RWTH Aachen Technical University, Pauwelsstr. 30, 52074, Aachen, Germany
| | - M Grass
- Institute of Occupational and Social Medicine, RWTH Aachen Technical University, Pauwelsstr. 30, 52074, Aachen, Germany
| | - C Gschwandtl
- Institute of Occupational and Social Medicine, RWTH Aachen Technical University, Pauwelsstr. 30, 52074, Aachen, Germany
| | - N Heussen
- Department of Medical Statistics, RWTH Aachen Technical University, Aachen, Germany
- Medical School, Sigmund Freud Private University, Vienna, Austria
| | - N Hundt
- Institute of Occupational and Social Medicine, RWTH Aachen Technical University, Pauwelsstr. 30, 52074, Aachen, Germany
| | - C Kühn
- Institute of Occupational and Social Medicine, RWTH Aachen Technical University, Pauwelsstr. 30, 52074, Aachen, Germany
| | - A Morrison
- Royal Free London NHS Foundation Trust, London, UK
| | - M Müller-Ost
- Institute of Occupational and Social Medicine, RWTH Aachen Technical University, Pauwelsstr. 30, 52074, Aachen, Germany
| | - M Müller-Tarpet
- Department of Technical Acoustics, RWTH Aachen University, Aachen, Germany
| | - S Porath
- Institute of Occupational and Social Medicine, RWTH Aachen Technical University, Pauwelsstr. 30, 52074, Aachen, Germany
| | - J Risse
- Institute of Occupational and Social Medicine, RWTH Aachen Technical University, Pauwelsstr. 30, 52074, Aachen, Germany
| | - S Schmitz
- Institute of Occupational and Social Medicine, RWTH Aachen Technical University, Pauwelsstr. 30, 52074, Aachen, Germany
| | - V Schöffl
- Medical Commission of the Union Internationale des Associations d'Alpinisme (UIAA MedCom), Bern, Switzerland
- Department of Sports Medicine-Sports Orthopaedics, Klinikum Bamberg, Bamberg, Germany
- Department of Trauma Surgery, Friedrich Alexander University Erlangen-Nuremberg, Erlangen, Germany
| | - L Timmermann
- Institute of Occupational and Social Medicine, RWTH Aachen Technical University, Pauwelsstr. 30, 52074, Aachen, Germany
| | - K Wernitz
- Department of Dental Preservation, Parodontology and Preventive Dentistry, RWTH Aachen Technical University, Aachen, Germany
| | - T Küpper
- Institute of Occupational and Social Medicine, RWTH Aachen Technical University, Pauwelsstr. 30, 52074, Aachen, Germany.
- Medical Commission of the Union Internationale des Associations d'Alpinisme (UIAA MedCom), Bern, Switzerland.
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Abstract
Cochlear damage is often thought to result in hearing thresholds shift, whether permanent or temporary. The report of tinnitus in the absence of any clear deficit in cochlear function was believed to indicate that hearing loss and tinnitus, while comorbid, could arise independently from each other. In all likelihood, tinnitus that is not of central nervous system origin is associated with hearing loss. As a correlate, although a treatment of most forms of tinnitus will likely emerge in the years to come, curing tinnitus will first require curing hearing loss.
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Affiliation(s)
- Ronna Hertzano
- Department of Otorhinolaryngology Head and Neck Surgery, University of Maryland School of Medicine, Baltimore, MD, USA; Anatomy and Neurobiology, University of Maryland School of Medicine, Baltimore, MD, USA; Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Erika L Lipford
- Department of Otorhinolaryngology Head and Neck Surgery, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Didier Depireux
- Department of Otorhinolaryngology Head and Neck Surgery, University of Maryland School of Medicine, Baltimore, MD, USA; R&D OtolithLabs, Washington, DC, USA.
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Nissen AC, Vetter BJ, Rogers LS, Mensinger AF. Impacts of broadband sound on silver (Hypophthalmichthys molitrix) and bighead (H. nobilis) carp hearing thresholds determined using auditory evoked potential audiometry. Fish Physiol Biochem 2019; 45:1683-1695. [PMID: 31218459 DOI: 10.1007/s10695-019-00657-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Accepted: 05/06/2019] [Indexed: 06/09/2023]
Abstract
Invasive silver (Hypophthalmichthys molitrix) and bighead (H. nobilis) carp, collectively referred to as bigheaded carps, threaten aquatic ecosystems of the Upper Midwestern USA. Due to the extensive ecological impacts associated with these species, prevention of their further range expansion is the aim for fisheries management. Recent behavioral studies indicate bigheaded carps are deterred by acoustic barriers and exhibit negative phonotaxis in response to anthropogenic sound sources (≥ 150 dB re 1 μPa). However, the impact of long-term exposure to these sounds on the hearing capabilities of bigheaded carps has not been well documented. In this study, the auditory evoked potential (AEP) technique was used to determine auditory thresholds among bigheaded carps before and after exposure to high intensity (155.7 ± 4.7 dB re 1 μPa SPLrms; - 8.0 ± 4.7 dB re 1 ms-2 PALrms; mean ± SD) broadband sound. Fish were exposed to sound for 30 min or 24 h and AEP measurements were taken at three time points: immediately after exposure, 48 h, or 96 h later. Results indicate that silver and bighead carp experience temporary threshold shifts (TTSs) in frequency detection following sound exposure with the magnitude and length of TTS correlated with exposure duration. The findings from this study will be used to increase the long-term efficacy of acoustical deterrent measures aimed at preventing further range expansion of bigheaded carps.
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Affiliation(s)
- Andrew C Nissen
- Biology Department, University of Minnesota Duluth, Duluth, MN, USA
| | - Brooke J Vetter
- Department of Psychology, University of Washington, Seattle, WA, USA.
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Cederholm JME, Ryan AF, Housley GD. Onset kinetics of noise-induced purinergic adaptation of the 'cochlear amplifier'. Purinergic Signal 2019; 15:343-355. [PMID: 31377959 PMCID: PMC6737159 DOI: 10.1007/s11302-019-09648-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Accepted: 02/06/2019] [Indexed: 12/18/2022] Open
Abstract
A major component of slowly reversible hearing loss which develops with sustained exposure to noise has been attributed to release of ATP in the cochlea activating P2X2 receptor (P2X2R) type ATP-gated ion channels. This purinergic humoral adaptation is thought to enable the highly sensitive hearing organ to maintain function with loud sound, protecting the ear from acoustic overstimulation. In the study that established this hearing adaptation mechanism as reported by Housley et al. (Proc Natl Acad Sci U S A 110:7494-7499, 2013), the activation kinetics were determined in mice from auditory brainstem response (ABR) threshold shifts with sustained noise presentation at time points beyond 10 min. The present study was designed to achieve finer resolution of the onset kinetics of purinergic hearing adaptation, and included the use of cubic (2f1-f2) distortion product otoacoustic emissions (DPOAEs) to probe whether the active mechanical outer hair cell 'cochlear amplifier' contributed to this process. We show that the ABR and DPOAE threshold shifts were largely complete within the first 7.5 min of moderate broadband noise (85 dB SPL) in wildtype C57Bl/6J mice. The ABR and DPOAE adaptation rates were both best fitted by a single exponential function with ~ 3 min time constants. ABR and DPOAE threshold shifts with this noise were minimal in mice null for the P2rx2 gene encoding the P2X2R. The findings demonstrate a considerably faster purinergic hearing adaptation to noise than previously appreciated. Moreover, they strongly implicate the outer hair cell as the site of action, as the DPOAEs stem from active cochlear electromotility.
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Affiliation(s)
- Jennie M E Cederholm
- Translational Neuroscience Facility and Department of Physiology, School of Medical Sciences, UNSW Sydney, Sydney, NSW, Australia
| | - Allen F Ryan
- Departments of Surgery and Neurosciences, University of California San Diego, La Jolla, CA, USA
- Veterans Administration Medical Center, La Jolla, CA, USA
| | - Gary D Housley
- Translational Neuroscience Facility and Department of Physiology, School of Medical Sciences, UNSW Sydney, Sydney, NSW, Australia.
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Frye MD, Zhang C, Hu BH. Lower level noise exposure that produces only TTS modulates the immune homeostasis of cochlear macrophages. J Neuroimmunol 2018; 323:152-166. [PMID: 30196827 DOI: 10.1016/j.jneuroim.2018.06.019] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Revised: 06/29/2018] [Accepted: 06/30/2018] [Indexed: 02/07/2023]
Abstract
Noise exposure producing temporary threshold shifts (TTS) has been demonstrated to cause permanent changes to cochlear physiology and hearing function. Several explanations have been purported to underlie these long-term changes in cochlear function, such as damage to sensory cell stereocilia and synaptic connections between sensory cells and their innervation by spiral ganglion neurons, and demyelination of the auditory nerve. Though these structural defects have been implicated in hearing difficulty, cochlear responses to this stress damage remains poorly understood. Here, we report the activation of the cochlear immune system following exposure to lower level noise (LLN) that causes only TTS. Using multiple morphological, molecular and functional parameters, we assessed the responses of macrophages, the primary immune cell population in the cochlea, to the LLN exposure. This study reveals that a LLN that causes only TTS increases the macrophage population in cochlear regions immediately adjacent to sensory cells and their innervations. Many of these cells acquire an activated morphology and express the immune molecules CCL2 and ICAM1 that are important for macrophage inflammatory activity and adhesion. However, LLN exposure reduces macrophage phagocytic ability. While the activated morphology of cochlear macrophages reverses, the complete recovery is not achieved 2 months after the LLN exposure. Taken together, these observations clearly implicate the cochlear immune system in the cochlear response to LLN that causes no permanent threshold change.
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Affiliation(s)
- Mitchell D Frye
- Center for Hearing and Deafness, University at Buffalo, 137 Cary Hall, 3435 Main Street, Buffalo, NY 14214, USA.
| | - Celia Zhang
- Center for Hearing and Deafness, University at Buffalo, 137 Cary Hall, 3435 Main Street, Buffalo, NY 14214, USA.
| | - Bo Hua Hu
- Center for Hearing and Deafness, University at Buffalo, 137 Cary Hall, 3435 Main Street, Buffalo, NY 14214, USA.
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Muca A, Standafer E, Apawu AK, Ahmad F, Ghoddoussi F, Hali M, Warila J, Berkowitz BA, Holt AG. Tinnitus and temporary hearing loss result in differential noise-induced spatial reorganization of brain activity. Brain Struct Funct 2018; 223:2343-2360. [PMID: 29488007 PMCID: PMC6129978 DOI: 10.1007/s00429-018-1635-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Accepted: 02/17/2018] [Indexed: 12/27/2022]
Abstract
Loud noise frequently results in hyperacusis or hearing loss (i.e., increased or decreased sensitivity to sound). These conditions are often accompanied by tinnitus (ringing in the ears) and changes in spontaneous neuronal activity (SNA). The ability to differentiate the contributions of hyperacusis and hearing loss to neural correlates of tinnitus has yet to be achieved. Towards this purpose, we used a combination of behavior, electrophysiology, and imaging tools to investigate two models of noise-induced tinnitus (either with temporary hearing loss or with permanent hearing loss). Manganese (Mn2+) uptake was used as a measure of calcium channel function and as an index of SNA. Manganese uptake was examined in vivo with manganese-enhanced magnetic resonance imaging (MEMRI) in key auditory brain regions implicated in tinnitus. Following acoustic trauma, MEMRI, the SNA index, showed evidence of spatially dependent rearrangement of Mn2+ uptake within specific brain nuclei (i.e., reorganization). Reorganization of Mn2+ uptake in the superior olivary complex and cochlear nucleus was dependent upon tinnitus status. However, reorganization of Mn2+ uptake in the inferior colliculus was dependent upon hearing sensitivity. Furthermore, following permanent hearing loss, reduced Mn2+ uptake was observed. Overall, by combining testing for hearing sensitivity, tinnitus, and SNA, our data move forward the possibility of discriminating the contributions of hyperacusis and hearing loss to tinnitus.
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Affiliation(s)
- Antonela Muca
- Department of Anatomy and Cell Biology, Wayne State University School of Medicine, 550 East Canfield Ave., Detroit, MI, 48201, USA
| | - Emily Standafer
- Department of Anatomy and Cell Biology, Wayne State University School of Medicine, 550 East Canfield Ave., Detroit, MI, 48201, USA
| | - Aaron K Apawu
- Department of Anatomy and Cell Biology, Wayne State University School of Medicine, 550 East Canfield Ave., Detroit, MI, 48201, USA
| | - Farhan Ahmad
- Department of Anatomy and Cell Biology, Wayne State University School of Medicine, 550 East Canfield Ave., Detroit, MI, 48201, USA
| | - Farhad Ghoddoussi
- Department of Anesthesiology, Wayne State University School of Medicine, Detroit, MI, USA
| | - Mirabela Hali
- Department of Anatomy and Cell Biology, Wayne State University School of Medicine, 550 East Canfield Ave., Detroit, MI, 48201, USA
| | - James Warila
- Department of Anatomy and Cell Biology, Wayne State University School of Medicine, 550 East Canfield Ave., Detroit, MI, 48201, USA
| | - Bruce A Berkowitz
- Department of Anatomy and Cell Biology, Wayne State University School of Medicine, 550 East Canfield Ave., Detroit, MI, 48201, USA
- Department of Ophthalmology, Wayne State University School of Medicine, Detroit, MI, USA
| | - Avril Genene Holt
- Department of Anatomy and Cell Biology, Wayne State University School of Medicine, 550 East Canfield Ave., Detroit, MI, 48201, USA.
- John D. Dingell VAMC, Detroit, MI, USA.
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Valero MD, Burton JA, Hauser SN, Hackett TA, Ramachandran R, Liberman MC. Noise-induced cochlear synaptopathy in rhesus monkeys (Macaca mulatta). Hear Res 2017; 353:213-223. [PMID: 28712672 PMCID: PMC5632522 DOI: 10.1016/j.heares.2017.07.003] [Citation(s) in RCA: 144] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2017] [Revised: 06/02/2017] [Accepted: 07/06/2017] [Indexed: 12/21/2022]
Abstract
Cochlear synaptopathy can result from various insults, including acoustic trauma, aging, ototoxicity, or chronic conductive hearing loss. For example, moderate noise exposure in mice can destroy up to ∼50% of synapses between auditory nerve fibers (ANFs) and inner hair cells (IHCs) without affecting outer hair cells (OHCs) or thresholds, because the synaptopathy occurs first in high-threshold ANFs. However, the fiber loss likely impairs temporal processing and hearing-in-noise, a classic complaint of those with sensorineural hearing loss. Non-human primates appear to be less vulnerable to noise-induced hair-cell loss than rodents, but their susceptibility to synaptopathy has not been studied. Because establishing a non-human primate model may be important in the development of diagnostics and therapeutics, we examined cochlear innervation and the damaging effects of acoustic overexposure in young adult rhesus macaques. Anesthetized animals were exposed bilaterally to narrow-band noise centered at 2 kHz at various sound-pressure levels for 4 h. Cochlear function was assayed for up to 8 weeks following exposure via auditory brainstem responses (ABRs) and otoacoustic emissions (OAEs). A moderate loss of synaptic connections (mean of 12-27% in the basal half of the cochlea) followed temporary threshold shifts (TTS), despite minimal hair-cell loss. A dramatic loss of synapses (mean of 50-75% in the basal half of the cochlea) was seen on IHCs surviving noise exposures that produced permanent threshold shifts (PTS) and widespread hair-cell loss. Higher noise levels were required to produce PTS in macaques compared to rodents, suggesting that primates are less vulnerable to hair-cell loss. However, the phenomenon of noise-induced cochlear synaptopathy in primates is similar to that seen in rodents.
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Affiliation(s)
- M D Valero
- Eaton-Peabody Laboratories, Massachusetts Eye and Ear Infirmary, Boston, MA 02114, USA; Department of Otolaryngology, Harvard Medical School, Boston, MA 02115, USA.
| | - J A Burton
- Vanderbilt University Medical Center, Dept. of Hearing and Speech Sciences, Nashville, TN 37232, USA
| | - S N Hauser
- Vanderbilt University Medical Center, Dept. of Hearing and Speech Sciences, Nashville, TN 37232, USA
| | - T A Hackett
- Vanderbilt University Medical Center, Dept. of Hearing and Speech Sciences, Nashville, TN 37232, USA
| | - R Ramachandran
- Vanderbilt University Medical Center, Dept. of Hearing and Speech Sciences, Nashville, TN 37232, USA
| | - M C Liberman
- Eaton-Peabody Laboratories, Massachusetts Eye and Ear Infirmary, Boston, MA 02114, USA; Department of Otolaryngology, Harvard Medical School, Boston, MA 02115, USA
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12
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Hom KN, Linnenschmidt M, Simmons JA, Simmons AM. Echolocation behavior in big brown bats is not impaired after intense broadband noise exposures. ACTA ACUST UNITED AC 2016; 219:3253-3260. [PMID: 27510961 DOI: 10.1242/jeb.143578] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Accepted: 08/04/2016] [Indexed: 11/20/2022]
Abstract
Echolocating bats emit trains of intense ultrasonic biosonar pulses and listen to weaker echoes returning from objects in their environment. Identification and categorization of echoes are crucial for orientation and prey capture. Bats are social animals and often fly in groups in which they are exposed to their own emissions and to those from other bats, as well as to echoes from multiple surrounding objects. Sound pressure levels in these noisy conditions can exceed 110 dB, with no obvious deleterious effects on echolocation performance. Psychophysical experiments show that big brown bats (Eptesicus fuscus) do not experience temporary threshold shifts after exposure to intense broadband ultrasonic noise, but it is not known if they make fine-scale adjustments in their pulse emissions to compensate for any effects of the noise. We investigated whether big brown bats adapt the number, temporal patterning or relative amplitude of their emitted pulses while flying through an acoustically cluttered corridor after exposure to intense broadband noise (frequency range 10-100 kHz; sound exposure level 152 dB). Under these conditions, four bats made no significant changes in navigation errors or in pulse number, timing and amplitude 20 min, 24 h or 48 h after noise exposure. These data suggest that big brown bats remain able to perform difficult echolocation tasks after exposure to ecologically realistic levels of broadband noise.
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Affiliation(s)
- Kelsey N Hom
- Department of Neuroscience, Brown University, Providence, RI 02912, USA
| | | | - James A Simmons
- Department of Neuroscience, Brown University, Providence, RI 02912, USA
| | - Andrea Megela Simmons
- Department of Neuroscience, Brown University, Providence, RI 02912, USA .,Department of Cognitive, Linguistic and Psychological Sciences, Brown University, Providence, RI 02912, USA
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13
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Chang MY, Han SY, Shin HC, Byun JY, Rah YC, Park MK. Protective effect of a purified polyphenolic extract from Ecklonia cava against noise-induced hearing loss: Prevention of temporary threshold shift. Int J Pediatr Otorhinolaryngol 2016; 87:178-84. [PMID: 27368468 DOI: 10.1016/j.ijporl.2016.06.028] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2016] [Revised: 06/06/2016] [Accepted: 06/08/2016] [Indexed: 10/21/2022]
Abstract
OBJECTIVE Noise is one of the most common causes of hearing loss. Approximately 16% of American teenagers (12-19 years) have hearing loss caused by loud noise. The implication of noise-induced hearing loss (NIHL) in teenagers has received increasing attention. Although temporary threshold shift (TTS), a type of NIHL, is a transient hearing loss, it can accelerate age-related hearing loss. Reactive oxygen species are a primary cause of TTS. As the polyphenols from Ecklonia cava are known to have potent antioxidant effects, we investigated the protective effects of a purified polyphenolic extract of Ecklonia cava (PPEE) against TTS in mice. METHODS The radical-scavenging activity of PPEE was evaluated using the 1,1-diphenyl-2-picrylhydrazyl assay. The PPEE + Noise and Saline + Noise groups were administered intraperitoneal PPEE (100 mg/kg) and saline, respectively, for 5 days before exposure to noise at 100 dB SPL for 60 min. Hearing ability was assessed following noise exposure using auditory brainstem responses and distortion product otoacoustic emissions. RESULTS PPEE exhibited significant radical scavenging activity. The ABR threshold shifts 1 day after exposure to noise at 16 kHz and 1, 7, and 14 days after exposure to noise at 32 kHz, were significantly less in the PPEE + Noise than in the Saline + Noise group. One day after noise exposure, mice in the PPEE + Noise group showed a significant degree of protection in relation to their DPOAE level at f2, 17, and 28 kHz. CONCLUSIONS These findings suggest that PPEE may be a potential preventive agent against TTS. In addition, as a food ingredient approved by the United States Food and Drug Administration, PPEE may be administered to those who are exposed to noise inevitably with little likelihood of adverse effects, thereby contributing to the prevention of TTS.
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Affiliation(s)
- Mun Young Chang
- Department of Otorhinolaryngology-Head and Neck Surgery, Chung-Ang University College of Medicine, Seoul, Republic of Korea
| | - Song Yee Han
- Department of Interdisciplinary Program in Biomedical Science, Major Graduate School of Soonchunhyang University, Asan-si, Republic of Korea
| | - Hyeon-Cheol Shin
- CEWIT Center for Systems Biology, State University of New York, Incheon, Republic of Korea
| | - Jang Yul Byun
- Department of Otolaryngology-Head and Neck Surgery, Soon Chun Hyang University College of Medicine, Seoul, Republic of Korea
| | - Yoon Chan Rah
- Department of Otolaryngology-Head and Neck Surgery, Korea University Medical Center Ansan Hospital, Ansan-si, Republic of Korea
| | - Moo Kyun Park
- Department of Otolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea.
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14
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Longenecker RJ, Alghamdi F, Rosen MJ, Galazyuk AV. Prepulse inhibition of the acoustic startle reflex vs. auditory brainstem response for hearing assessment. Hear Res 2016; 339:80-93. [PMID: 27349914 DOI: 10.1016/j.heares.2016.06.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 05/18/2016] [Accepted: 06/13/2016] [Indexed: 02/08/2023]
Abstract
The high prevalence of noise-induced and age-related hearing loss in the general population has warranted the use of animal models to study the etiology of these pathologies. Quick and accurate auditory threshold determination is a prerequisite for experimental manipulations targeting hearing loss in animal models. The standard auditory brainstem response (ABR) measurement is fairly quick and translational across species, but is limited by the need for anesthesia and a lack of perceptual assessment. The goal of this study was to develop a new method of hearing assessment utilizing prepulse inhibition (PPI) of the acoustic startle reflex, a commonly used tool that measures detection thresholds in awake animals, and can be performed on multiple animals simultaneously. We found that in control mice PPI audiometric functions are similar to both ABR and traditional operant conditioning audiograms. The hearing thresholds assessed with PPI audiometry in sound exposed mice were also similar to those detected by ABR thresholds one day after exposure. However, three months after exposure PPI threshold shifts were still evident at and near the frequency of exposure whereas ABR thresholds recovered to the pre-exposed level. In contrast, PPI audiometry and ABR wave one amplitudes detected similar losses. PPI audiometry provides a high throughput automated behavioral screening tool of hearing in awake animals. Overall, PPI audiometry and ABR assessments of the auditory system are robust techniques with distinct advantages and limitations, which when combined, can provide ample information about the functionality of the auditory system.
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Affiliation(s)
- R J Longenecker
- Northeast Ohio Medical University, Department of Anatomy and Neurobiology, Rootstown, OH, USA.
| | - F Alghamdi
- Northeast Ohio Medical University, Department of Anatomy and Neurobiology, Rootstown, OH, USA
| | - M J Rosen
- Northeast Ohio Medical University, Department of Anatomy and Neurobiology, Rootstown, OH, USA
| | - A V Galazyuk
- Northeast Ohio Medical University, Department of Anatomy and Neurobiology, Rootstown, OH, USA
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15
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Abstract
Exposure to intense sound or ototoxic chemicals can damage the auditory hair cells of vertebrates, resulting in hearing loss. Although the relationship between such hair cell damage and auditory function is fairly established for terrestrial vertebrates, there are limited data available to understand this relationship in fishes. Although investigators have measured either the morphological damage of the inner ear or the functional deficits in the hearing of fishes, very few have directly measured both in an attempt to find a relationship between the two. Those studies that have examined both auditory hair cell damage in the inner ear and the resulting hearing loss in fishes are reviewed here. In general, there is a significant linear relationship between the number of hair cells lost and the severity of hearing threshold shifts, although this varies between species and different hair cell-damaging stimuli. After trauma to the fish ear, auditory hair cells are able to regenerate to control level densities. With this regeneration also comes a restoration of hearing. Thus there is also a significant relationship between hair cell recovery and hearing recovery in fishes.
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Affiliation(s)
- Michael E Smith
- Department of Biology, Western Kentucky University, Bowling Green, KY, 42101, USA.
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16
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Abstract
Despite a major research effort, no generally accepted exposure limits are available for harbor porpoises. Recent studies of the temporary threshold shift (TTS) in porpoises indicate that the sound exposure levels (SELs) required to induce low levels of TTS depend on stimulus frequency and roughly parallel the shape of the audiogram. A number of studies on behavioral avoidance reactions (negative phonotaxis) to pingers, seal scarers, and pile driving show a similar dependence on stimulus frequency. Both TTS and behavioral data suggest that weighting sound pressure levels with a filter function resembling the inverted audiogram would be appropriate.
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17
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Schlundt CE, Finneran JJ, Branstetter BK, Trickey JS, Bowman V, Jenkins K. Auditory Effects of Multiple Impulses from a Seismic Air Gun on Bottlenose Dolphins (Tursiops truncatus). Adv Exp Med Biol 2015; 875:987-91. [PMID: 26611059 DOI: 10.1007/978-1-4939-2981-8_122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
Auditory thresholds were measured in three bottlenose dolphins before and after exposure to ten impulses from a seismic air gun. Thresholds were measured using behavioral and electrophysiological methods to determine the amount of temporary threshold shift induced. The results suggest that the potential for seismic surveys using air guns to cause auditory effects on dolphins may be lower than previously predicted; however, two of the three dolphins exhibited "anticipatory" behavioral changes at the highest exposure condition that suggested they were attempting to mitigate the effects of the exposures.
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Affiliation(s)
- Carolyn E Schlundt
- Exelis, Inc., 3276 Rosecrans Street, 1st Floor, San Diego, CA, 92110, USA.
| | - James J Finneran
- Space and Naval Warfare Systems (SPAWAR) Center (SSC) Pacific, San Diego, CA, 92152, USA.
| | | | | | - Victoria Bowman
- National Marine Mammal Foundation, San Diego, CA, 92106, USA.
| | - Keith Jenkins
- Space and Naval Warfare Systems (SPAWAR) Center (SSC) Pacific, San Diego, CA, 92152, USA.
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18
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Supin A, Popov V, Nechaev D, Sysueva E, Rozhnov V. Is Sound Exposure Level a Convenient Metric to Characterize Fatiguing Sounds? A Study in Beluga Whales. Adv Exp Med Biol 2016; 875:1123-9. [PMID: 26611076 DOI: 10.1007/978-1-4939-2981-8_139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register]
Abstract
Both the level and duration of fatiguing sounds influence temporary threshold shifts (TTSs) in odontocetes. These two parameters were combined into a sound exposure level (SEL). In the beluga whale Delphinapterus leucas, TTSs were investigated at various sound pressure level (SPL)-to-duration ratios at a specific SEL. At low SPL-to-duration ratios, the dependence was positive: shorter high-level sounds produced greater TTSs than long low-level sounds of the same SEL. At high SPL-to-duration ratios, the dependence was negative: long low-level sounds produced greater TTSs than short high-level sounds of the same SEL. Thus, the validity of SEL as a metric for fatiguing sound efficiency is limited.
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Andersson MH, Johansson T. Assessment of Marine Mammal Impact Zones for Use of Military Sonar in the Baltic Sea. Adv Exp Med Biol 2015; 875:37-45. [PMID: 26610942 DOI: 10.1007/978-1-4939-2981-8_5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
Military sonars are known to have caused cetaceans to strand. Navies in shallow seas use different frequencies and sonar pulses, commonly frequencies between 25 and 100 kHz, compared with most studied NATO sonar systems that have been evaluated for their environmental impact. These frequencies match the frequencies of best hearing in the harbor porpoises and seals resident in the Baltic Sea. This study uses published temporary and permanent threshold shifts, measured behavioral response thresholds, technical specifications of a sonar system, and environmental parameters affecting sound propagation common for the Baltic Sea to estimate the impact zones for harbor porpoises and seals.
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Affiliation(s)
- Mathias H Andersson
- Department of Underwater Research, Swedish Defence Research Agency, 164 90, Stockholm, Sweden.
| | - Torbjörn Johansson
- Department of Underwater Research, Swedish Defence Research Agency, 164 90, Stockholm, Sweden.
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20
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Tougaard J, Wright AJ, Madsen PT. Cetacean noise criteria revisited in the light of proposed exposure limits for harbour porpoises. Mar Pollut Bull 2015; 90:196-208. [PMID: 25467877 DOI: 10.1016/j.marpolbul.2014.10.051] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2014] [Revised: 10/28/2014] [Accepted: 10/30/2014] [Indexed: 05/17/2023]
Abstract
The impact of underwater noise on marine life calls for identification of exposure criteria to inform mitigation. Here we review recent experimental evidence with focus on the high-frequency cetaceans and discuss scientifically-based initial exposure criteria. A range of new TTS experiments suggest that harbour and finless porpoises are more sensitive to sound than expected from extrapolations based on results from bottlenose dolphins. Furthermore, the results from TTS experiments and field studies of behavioural reactions to noise, suggest that response thresholds and TTS critically depend on stimulus frequency. Sound exposure levels for pure tones that induce TTS are reasonably consistent at about 100 dB above the hearing threshold for pure tones and sound pressure thresholds for avoidance reactions are in the range of 40-50 dB above the hearing threshold. We propose that frequency weighting with a filter function approximating the inversed audiogram might be appropriate when assessing impact.
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Affiliation(s)
- Jakob Tougaard
- Aarhus University, Department of Bioscience, Frederiksborgvej 399, DK-4000 Roskilde, Denmark.
| | - Andrew J Wright
- Aarhus University, Department of Bioscience, Frederiksborgvej 399, DK-4000 Roskilde, Denmark; Department of Environmental Science and Policy, George Mason University, 4400 University Drive, Fairfax, VA 22030, USA
| | - Peter T Madsen
- Aarhus University, Department of Bioscience, DK-8000 Aarhus C, Denmark; Murdoch University Cetacean Research Unit, Murdoch University, WA, Australia
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21
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S H C, Reddy P, M M K, Khavasi P, Doddamani SS. Alterations in cochlear function after exposure to short term broad band noise assessed by otoacoustic emissions. J Clin Diagn Res 2014; 8:KC03-5. [PMID: 25386468 DOI: 10.7860/jcdr/2014/10528.4896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Accepted: 08/17/2014] [Indexed: 11/24/2022]
Abstract
BACKGROUND Sudden or chronic exposure to sound alters the functioning of cochlea. This results in temporary or permanent alteration of functioning of cochlear cells. Alteration of functioning of outer hair cells (OHC) of cochlea following exposure to noise can be assessed by measurement of transient otoacoustic emissions (TEOAE). Such a measurement is of great clinical importance in early detection of the damage to the OHC. AIM In this study we aim to study effect of noise on outer hair cell function by studying the changes in TEOAE's amplitude following exposure to short term broad band noise in healthy volunteers. MATERIALS AND METHODS Twenty volunteers' ten males and ten females participated in the study. They underwent pure tone and impedance audiometry to rule out ear pathology. Then pre-exposure TEOAE's were recorded. After that they were exposed to broad band noise for two minutes. After gap of five minutes again TEOAE's were recorded. Pre and post exposure amplitude of TEOAE's was analysed statistically.s RESULTS There was statistically significant difference between pre exposure and post-exposure amplitude of TEOAE's. Pre and post exposure values for A & B amplitudes showed p-value of 0.0001 whereas values for A-B amplitude showed p-value of 0.0001. CONCLUSION Measurement of TEOAE's can detect early changes in the functioning of outer hair cells which cannot be picked by routine pure tone audiometry. Thus they can be used in assessing early changes in cochlear function following exposure to noise in individuals exposed to sudden noise or working in noisy environments. Thus preventive methods to reduce the noise induced hearing loss in such individuals can be implemented.
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Affiliation(s)
- Chandrashekharayya S H
- Associate Professor, Department of Ear, Nose and Throat, S.Nijalingappa Medical College and Shree Hanagal Kumareshwar Hospital & Research Center , Karnataka, India
| | - Prasen Reddy
- Audiologist and Speech Therapist, Department of Ear, Nose and Throat, S.Nijalingappa Medical College and Shree Hanagal Kumareshwar Hospital & Research Center , Karnataka, India
| | - Kavitha M M
- Assistant Professor, Department of Biochemistry, S.Nijalingappa Medical College and Shree Hanagal Kumareshwar Hospital & Research Center , Karnataka, India
| | - Prabhu Khavasi
- Assistant Professor, Department of Ear, Nose and Throat, S.Nijalingappa Medical College and Shree Hanagal Kumareshwar Hospital & Research Center , Karnataka, India
| | - S S Doddamani
- Professor and HOD, Departmentof Ear, Nose and Throat, S.Nijalingappa Medical College and Shree Hanagal Kumareshwar Hospital & Research Center , Karnataka, India
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Lee JW, Shim BS, Chung JW. The effect of gingko biloba on hearing in mice with noise-induced temporary threshold shift. Korean J Audiol 2014; 17:74-7. [PMID: 24653910 PMCID: PMC3936537 DOI: 10.7874/kja.2013.17.2.74] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/13/2013] [Revised: 04/15/2013] [Accepted: 05/02/2013] [Indexed: 11/22/2022]
Abstract
Background and Objectives Gingko biloba extract is known for enhancing blood circulation, scavenging free radicals, and antagonizing against platelet-activating factor. This study evaluated the effect of Gingko biloba on the noise-induced temporary threshold shift of hearing. Materials and Methods Temporary threshold shift was induced by exposing mice to 110 dB SPL sound for 1 hour. The experimental group consisted of mice fed Gingko biloba [3 mg/kg, 6 mg/kg, and 12 mg/kg in 0.5% carboxymethyl cellulose (CMC)] for 7 days before noise exposure. CMC solution without Gingko biloba was fed to control mice. Hearing threshold was measured by auditory brainstem response (ABR) and distortion product otoacoustic emission (DPOAE). Results The hearing threshold increased after noise exposure and recovered to normal within 5 days in all groups. Compared to control mice (fed CMC solution only), mice fed Gingko biloba showed more rapid recovery of ABR threshold at 16 kHz in all three experimental groups. At the other frequencies, there was no significant change in hearing recovery in the Gingko biloba groups. There was no difference in DPOAE between groups. Conclusions Temporary threshold shift of hearing after noise exposure was partly affected by oral Gingko biloba.
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Affiliation(s)
- Ji-Won Lee
- Asan Institute For Life Science, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea. ; Department of Otorhinolaryngology-Head and Neck Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Byoung Soo Shim
- Department of Otorhinolaryngology-Head and Neck Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Jong Woo Chung
- Department of Otorhinolaryngology-Head and Neck Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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23
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Kumar P, Kumar K, Barman A. Effect of short duration broad band noise on transient evoked otoacoustic emission amplitude. Indian J Otolaryngol Head Neck Surg 2013; 65:44-7. [PMID: 24381919 DOI: 10.1007/s12070-012-0600-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2012] [Accepted: 11/20/2012] [Indexed: 10/27/2022] Open
Abstract
Transient evoked otoacoustic emission (TEOAE) is being a non-invasive, objective technique and required less time to get administered can be easily used to find out effect of short duration broad band noise (BBN). However one must know the sensitivity of TEOAEs in predicting susceptibility of noise induced hearing loss. Thus the present study has taken up to find out the effect on TEOAE amplitude because of short duration exposure of BBN. Results indicated that there was statistically significant reduction in amplitude of TEOAE at all frequencies except 1 kHz (p < 0.05). It is also observed that the basal region of cochlea is more prone to noise exposure than apical region as revealed in the outcome of the study.
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