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Singh K, Gude A, Kour A, Guthikonda MR, Mishra AK, Gupta A. A Prospective Study to Elucidate the Efficacy of 4 Oral Prednisolone Regimens in Acute Acoustic Trauma. Indian J Otolaryngol Head Neck Surg 2022; 74:3692-3699. [PMID: 36742739 PMCID: PMC9895518 DOI: 10.1007/s12070-021-02437-8] [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: 12/14/2020] [Accepted: 02/02/2021] [Indexed: 02/07/2023] Open
Abstract
Noise induced hearing loss affects around 5% of the population and acoustic trauma to military personnel accounts for 30% of all injuries inflicted during active service. Initial treatment for acoustic trauma involves administration of steroids, however there are no studies regarding oral steroid regimens for best outcomes. Comparing and elucidating the benefits of four oral steroid regimens on hearing gain in patients with acute acoustic trauma. A prospective study of 4 different steroid regimens was done in 200 soldiers from July 2014 - July 2020. In the first group, oral Prednisolone 60 mg was administered for 6 days, in the second group for 8 days, in the third group for 10 days and in the fourth group for 12 days. Medication was tapered over the next 5 days in all the groups. Data analysed included demographics, Pure Tone Audiograms at admission and at 4 weeks, time of reporting to hospital, onset of treatment and type of treatment given. Multivariate linear regression model was done to consider the risk factors responsible for average hearing gain at all pure tones. Box-and-whisker plot, Mann-Whitney-Wilcoxon test, Kruskal Wallis test, Reciever Operating Characteristic curve were used to analyse the independent samples. p value of < 0.05 was considered statistically significant. Age, time of onset of prednisolone therapy and acoustic trauma due to blast or gunshot injury did not show correlation (R2 = 0.01, 0.01 and 0.35 respectively and p = 0.09, 0.71, 0.80 respectively). Prednisolone therapy, average initial hearing at pure tones were considered as factors responsible for hearing gain as they showed correlation (R2 = 0.22, and 0.34 respectively and p < 0.001 and < 0.01 respectively). Significant hearing gain was found in all groups. The hearing gain was statistically better in group 3 and 4 as compared to group 1 and 2. There was no statistically significant difference in hearing gain between groups 3 and 4. So there was no additional advantage of giving 60 mg oral prednisolone for more than 10 days. The best oral prednisolone regimen recommended is 60 mg/day for 10 days which is tapered over the next 5 days.
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Affiliation(s)
- Kamalpreet Singh
- Dept of Otorhinolaryngology-Head & Neck Surgery, Armed Forces Medical College, Pune, Maharashtra India 411040
| | - Aswini Gude
- Department of Pathology, Gayatri Institute of Health Care &Medical Technology, GVP Medical College, Maridi Valley, Marikavalasa, Visakhapatnam, Andhra Pradesh 530048 India
| | - Amrindarjeet Kour
- Medical Officer, Armed Forced Medical College, Pune, Maharashtra 411040 India
| | - Mohan Raghav Guthikonda
- Dept of Otorhinolaryngology- Head & Neck Surgery, 166 Military Hospital, Satwari Cantonment, Jammu and Kashmir, Jammu, 180003 India
| | - Awadhesh Kumar Mishra
- Dept of Otorhinolaryngology-Head & Neck Surgery, Army College of Medical Sciences &Base Hospital, Delhi Cantt, New Delhi, India
| | - Arun Gupta
- Dept of PSM, AFMC, Pune, Maharashtra India
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Sex differences in the auditory functions of rodents. Hear Res 2021; 419:108271. [PMID: 34074560 DOI: 10.1016/j.heares.2021.108271] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 04/07/2021] [Accepted: 04/28/2021] [Indexed: 12/30/2022]
Abstract
BACKGROUND In humans, it is well known that females have better hearing than males. The mechanism of this influence of sex on auditory function in humans is not well understood. Testing the hypothesis of underlying mechanisms often relies on preclinical research, a field in which sex bias still exists unconsciously. Rodents are popular research models in hearing, thus it is crucial to understand the sex differences in these rodent models when studying health and disease in humans. OBJECTIVES This review aims to summarize the existing sex differences in the auditory functions of rodent species including mouse, rat, Guinea pig, Mongolian gerbil, and chinchilla. In addition, a concise summary of the hearing characteristics and the advantages and the drawbacks of conducting auditory experiments in each rodent species is provided. DESIGNS Manuscripts were identified in PubMed and Ovid Medline for the queries "Rodent", "Sex Characteristics", and "Hearing or Auditory Function". Manuscripts were included if they were original research, written in English, and use rodents. The content of each manuscript was screened for the sex of the rodents and the discussion of sex-based results. CONCLUSIONS The sex differences in auditory function of rodents are prevalent and influenced by multiple factors including physiological mechanisms, sex-based anatomical variations, and stimuli from the external environment. Such differences may play a role in understanding and explaining sex differences in hearing of humans and need to be taken into consideration for developing clinical therapies aim to improve auditory performances.
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Bagheri F, Sheikhzadeh M, Raisi A, Kamali M, Faridan M. The impact of carbon monoxide inhalation on developing noise-induced hearing loss in guinea pigs. Med Gas Res 2020; 10:110-113. [PMID: 33004707 PMCID: PMC8086620 DOI: 10.4103/2045-9912.296040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Carbon monoxide (CO) poisoning is one of the most common types of fatal poisonings worldwide. Acute exposure to high levels of CO as well as chronic exposure to low levels of CO and excessive noise can lead to high frequency hearing loss. In this study, twelve guinea pigs were randomly divided into two groups: (1) exposed to noise and (2) exposed to noise plus CO. Auditory brainstem responses (ABRs) were measured prior to the experiment and immediately, 5, 10 and 15 days post exposures. There was a significant difference between the ABR thresholds before and immediately after exposure to noise at frequencies of 4, 8, and 16 kHz and the most threshold shift was observed at 8 kHz. There was also a significant difference between the ABR thresholds before and immediately after exposure to noise and CO at frequencies of 2, 4, 8, and 16 kHz which demonstrated a temporary hearing loss after exposure to noise and CO and the major impact of CO on developing noise induced hearing loss occurred at 8 kHz. No significant difference was observed between the ABR thresholds recorded before conducting the experiments and the ones obtained 5, 10 and 15 days after simultaneous exposure to noise and CO at none of frequencies. Simultaneous exposure to noise and CO contributes to transient hearing loss in guinea pigs with the most evident temporary shift at 8 kHz. The methods were accepted in the Ethics Committee of Iran University of Medical Science (registration No. CTRI/2016/01/017170) on January 18, 2016.
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Affiliation(s)
- Fereshte Bagheri
- Department of Audiology, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran; Department of Audiology, School of Rehabilitation Sciences, Babol University of Medical Sciences, Mazandaran, Iran
| | - Mahbubeh Sheikhzadeh
- Department of Audiology, School of Rehabilitation Sciences, Babol University of Medical Sciences, Mazandaran, Iran
| | - Ahmadreza Raisi
- Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran
| | - Mohammad Kamali
- Department of Audiology, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran
| | - Mohammad Faridan
- Department of Occupational Health Engineering and Safety at Work, School of Health and Nutrition, Lorestan University of Medical Sciences, Khoramabad, Iran
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Golmohammadi R, Darvishi E. The combined effects of occupational exposure to noise and other risk factors - a systematic review. Noise Health 2019; 21:125-141. [PMID: 32719300 PMCID: PMC7650855 DOI: 10.4103/nah.nah_4_18] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Revised: 12/20/2019] [Accepted: 01/03/2020] [Indexed: 12/16/2022] Open
Abstract
PURPOSE Noise-induced health effects exacerbate by many other risk factors. This systematic review aims at shedding light on the combined effects of co-exposure to occupational noise and other factors. MATERIAL AND METHODS A literature search in Web of Science, Scopus, PubMed, Science Direct, and Google Scholar, with appropriate keywords on combined effects of occupational noise, and co-exposure to noise and other factors, revealed 7928 articles which were screened by two researchers. A total of 775 articles were reviewed in full text. We found 149 articles that were relevant and had sufficient quality for analysis. RESULTS We identified 16 risk factors that exacerbate occupational noise-induced health effects. These factors were classified into four groups: chemical (carbon monoxide (CO), solvents, heavy metals, and other chemicals), physical (lighting, heat, vibration, and cold), personal (age, gender, genetics, smoking, medication, contextual diseases) and occupational (workload and shift work). Hearing loss, hypertension, reduced performance, and cardiovascular strains, are the most important risk factors combined effects due to concurrent exposure to noise and other risk factors. CONCLUSION Evidences of combined effects of solvents, vibration, heavy metals, CO, smoking, chemicals, aging, heat, and shiftwork were respectively stronger than for other factors. Most of the studies have investigated only the combined effects of risk factors on hearing, and the evidence for non-auditory effects is still limited, and more studies are warranted. Therefore, in the Hearing Conservation Programs, besides noise, aggravating factors of noise effects should also be taken into account.
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Affiliation(s)
- Rostam Golmohammadi
- Center of Excellence for Occupational Health, School of Public Health and Research Center for Health Sciences, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Ebrahim Darvishi
- Department of Occupational Health Engineering, Environmental Health Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences, Sanandaj, Iran
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Horvath L, Bächinger D, Honegger T, Bodmer D, Naldi AM. Functional and morphological analysis of different aminoglycoside treatment regimens inducing hearing loss in mice. Exp Ther Med 2019; 18:1123-1130. [PMID: 31316607 PMCID: PMC6601143 DOI: 10.3892/etm.2019.7687] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Accepted: 05/23/2019] [Indexed: 01/05/2023] Open
Abstract
Aminoglycoside ototoxicity is common in clinical practice but reliable protective agents currently do not exist. Aminoglycoside regimens causing ototoxicity in different laboratory animals are under investigation. The assessment method used most commonly to determine auditory effects is the auditory brainstem response (ABR). Distortion product otoacoustic emissions (DPOAE) have been used less frequently. A precise recommendation on the specific method to assess peripheral auditory function before and after aminoglycoside toxicity in mice does not exist. In order to evaluate various mouse models for ototoxic injury caused by various aminoglycoside regimens, there is a need for performing preliminary tests in small cohorts before large experiments. The aim of our study was to investigate different aminoglycoside regimens that cause substantial ototoxic damage in vivo. Aminoglycosides are safe and produce a detectable hearing threshold shift in a small cohort of mice that can be used as a model for preliminary tests. Different ototoxic regimens were assessed by ABR and DPOAE measurements pre- and post-treatment. Further, the sensory cell loss was quantified by counting hair cells in the cochlea. It was revealed that an ototoxic regimen with kanamycin twice daily for 15 consecutive days is safe, well tolerated and produces an early significant hearing threshold shift detected by DPOAE in a small cohort of mice. The study compared ABR and DPOAE in mentioned regimens for the first time and illustrated that DPOAE is well suited for detecting hearing threshold shifts in high frequencies before ABR threshold shifts occur in accordance with predominating outer hair cell damage mainly in the basal turn of the cochlea.
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Affiliation(s)
- Lukas Horvath
- Department of Otorhinolaryngology, Head and Neck Surgery, University of Zurich, University Hospital Zurich, 8091 Zurich, Switzerland.,Department of Biomedicine and The Clinic for Otorhinolaryngology, University Hospital Basel, 4031 Basel, Switzerland
| | - David Bächinger
- Department of Otorhinolaryngology, Head and Neck Surgery, University of Zurich, University Hospital Zurich, 8091 Zurich, Switzerland
| | - Tim Honegger
- Department of Otorhinolaryngology, Head and Neck Surgery, University of Zurich, University Hospital Zurich, 8091 Zurich, Switzerland
| | - Daniel Bodmer
- Department of Biomedicine and The Clinic for Otorhinolaryngology, University Hospital Basel, 4031 Basel, Switzerland
| | - Arianne Monge Naldi
- Department of Otorhinolaryngology, Head and Neck Surgery, University of Zurich, University Hospital Zurich, 8091 Zurich, Switzerland
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Garinis AC, Liao S, Cross CP, Galati J, Middaugh JL, Mace JC, Wood AM, McEvoy L, Moneta L, Lubianski T, Coopersmith N, Vigo N, Hart C, Riddle A, Ettinger O, Nold C, Durham H, MacArthur C, McEvoy C, Steyger PS. Effect of gentamicin and levels of ambient sound on hearing screening outcomes in the neonatal intensive care unit: A pilot study. Int J Pediatr Otorhinolaryngol 2017; 97:42-50. [PMID: 28483249 PMCID: PMC5439527 DOI: 10.1016/j.ijporl.2017.03.025] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Revised: 03/16/2017] [Accepted: 03/18/2017] [Indexed: 11/29/2022]
Abstract
OBJECTIVE Hearing loss rates in infants admitted to neonatal intensive care units (NICU) run at 2-15%, compared to 0.3% in full-term births. The etiology of this difference remains poorly understood. We examined whether the level of ambient sound and/or cumulative gentamicin (an aminoglycoside) exposure affect NICU hearing screening results, as either exposure can cause acquired, permanent hearing loss. We hypothesized that higher levels of ambient sound in the NICU, and/or gentamicin dosing, increase the risk of referral on the distortion product otoacoustic emission (DPOAE) assessments and/or automated auditory brainstem response (AABR) screens. METHODS This was a prospective pilot outcomes study of 82 infants (<37 weeks gestational age) admitted to the NICU at Oregon Health & Science University. An ER-200D sound pressure level dosimeter was used to collect daily sound exposure in the NICU for each neonate. Gentamicin dosing was also calculated for each infant, including the total daily dose based on body mass (mg/kg/day), as well as the total number of treatment days. DPOAE and AABR assessments were conducted prior to discharge to evaluate hearing status. Exclusion criteria included congenital infections associated with hearing loss, and congenital craniofacial or otologic abnormalities. RESULTS The mean level of ambient sound was 62.9 dBA (range 51.8-70.6 dBA), greatly exceeding American Academy of Pediatrics (AAP) recommendation of <45.0 dBA. More than 80% of subjects received gentamicin treatment. The referral rate for (i) AABRs, (frequency range: ∼1000-4000 Hz), was 5%; (ii) DPOAEs with a broad F2 frequency range (2063-10031 Hz) was 39%; (iii) DPOAEs with a low-frequency F2 range (<4172 Hz) was 29%, and (iv) DPOAEs with a high-frequency F2 range (>4172 Hz) was 44%. DPOAE referrals were significantly greater for infants receiving >2 days of gentamicin dosing compared to fewer doses (p = 0.004). The effect of sound exposure and gentamicin treatment on hearing could not be determined due to the low number of NICU infants without gentamicin exposure (for control comparisons). CONCLUSION All infants were exposed to higher levels of ambient sound that substantially exceed AAP guidelines. More referrals were generated by DPOAE assessments than with AABR screens, with significantly more DPOAE referrals with a high-frequency F2 range, consistent with sound- and/or gentamicin-induced cochlear dysfunction. Adding higher frequency DPOAE assessments to existing NICU hearing screening protocols could better identify infants at-risk for ototoxicity.
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Affiliation(s)
- Angela C. Garinis
- Department of Otolaryngology, Oregon Health & Science University, Portland, Oregon
| | - Selena Liao
- Department of Otolaryngology, Oregon Health & Science University, Portland, Oregon
| | - Campbell P. Cross
- School of Medicine, Oregon Health & Science University, Portland, Oregon,Oregon Hearing Research Center, Oregon Health & Science University, Portland, Oregon
| | - Johnathan Galati
- Oregon Hearing Research Center, Oregon Health & Science University, Portland, Oregon
| | - Jessica L. Middaugh
- Department of Otolaryngology, Oregon Health & Science University, Portland, Oregon
| | - Jess C. Mace
- Department of Otolaryngology, Oregon Health & Science University, Portland, Oregon
| | - Anna-Marie Wood
- Oregon Hearing Research Center, Oregon Health & Science University, Portland, Oregon
| | - Lindsey McEvoy
- Oregon Hearing Research Center, Oregon Health & Science University, Portland, Oregon
| | - Lauren Moneta
- Department of Otolaryngology, Oregon Health & Science University, Portland, Oregon
| | - Troy Lubianski
- Oregon Clinical and Translational Research Institute, Oregon Health & Science University, Portland, Oregon
| | - Noe Coopersmith
- Oregon Clinical and Translational Research Institute, Oregon Health & Science University, Portland, Oregon
| | - Nicholas Vigo
- School of Medicine, Oregon Health & Science University, Portland, Oregon
| | - Christopher Hart
- School of Medicine, Oregon Health & Science University, Portland, Oregon
| | - Artur Riddle
- School of Medicine, Oregon Health & Science University, Portland, Oregon
| | - Olivia Ettinger
- Oregon Hearing Research Center, Oregon Health & Science University, Portland, Oregon
| | - Casey Nold
- Oregon Clinical and Translational Research Institute, Oregon Health & Science University, Portland, Oregon
| | - Heather Durham
- Child Development and Research Center, Oregon Health & Science University, Portland, Oregon
| | - Carol MacArthur
- Department of Otolaryngology, Oregon Health & Science University, Portland, Oregon
| | - Cynthia McEvoy
- Department of Neonatology, Oregon Health & Science University, Portland, Oregon
| | - Peter S. Steyger
- Department of Otolaryngology, Oregon Health & Science University, Portland, Oregon,Oregon Hearing Research Center, Oregon Health & Science University, Portland, Oregon
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Neurotrophic and antioxidant effects of silymarin comparable to 4-methylcatechol in protection against gentamicin-induced ototoxicity in guinea pigs. Pharmacol Rep 2014; 67:317-25. [PMID: 25712657 DOI: 10.1016/j.pharep.2014.10.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Revised: 09/14/2014] [Accepted: 10/06/2014] [Indexed: 11/21/2022]
Abstract
BACKGROUND Despite that gentamicin is a very effective aminoglycoside, its potential ototoxicity which is of irreversible nature makes a challenge and limitation for its use. This study was designed to investigate possible neurotrophic and antioxidant effects of silymarin comparable to 4-methylcatechol in protection against gentamicin-induced ototoxicity. METHODS AND RESULTS Twenty pigmented guinea pigs were divided into four equal groups, where group I served as normal control group. The other groups received gentamicin (120 mg/kg/day, ip) for 19 days where group II given vehicle of 1% CMC, group III and group IV were pre-treated 2h before gentamicin by 4-methylcatechol (10 μg/kg, ip) and silymarin (100mg/kg, oral gavage), respectively. The main findings indicated that silymarin exhibited restoration of nerve growth factor (NGF) levels and increased tropomyosin-related kinase receptors-A (Trk-A) m-RNA expression in cochlear tissue and preservation of hair cells of organ of Corti by scanning electron microscopy (SEM) with significant decrease in auditory brainstem response (ABR) threshold compared to 4-methylcatechol. Only silymarin caused significant amelioration in oxidative stress state by reducing malondialdehyde (MDA) levels and increasing catalase activity. CONCLUSIONS Silymarin exerts superiority over 4-methylcatechol when recommended as protective agent against gentamicin ototoxicity based on its efficient neurotrophic and antioxidant activities.
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Abstract
Majority of hearing-loss cases with extremely preterm infants have no known etiology. There is a growing concern that the administration of aminoglycoside treatment in the noisy environment of the Neonatal Intensive Care Unit (NICU) may lead to hair-cell damage and subsequent auditory impairments. In addition, several mitochondrial DNA mutations are known to have been associated with aminoglycoside-induced hearing loss. This review provides a systematic analysis of the research in this area and elucidates the multifactorial mechanisms behind how mitochondrial DNA mutations, aminoglycosides and loud noise can potentiate ototoxicity in extremely preterm neonates. Recommended steps to minimize the risk of ototoxicity and improve clinical care for NICU infants are discussed.
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Wu HP, Guo YL, Cheng TJ, Hsu CJ. Chronological changes in compromised olivocochlear activity and the effect of insulin in diabetic Wistar rats. Hear Res 2010; 270:173-8. [DOI: 10.1016/j.heares.2010.07.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2010] [Revised: 07/08/2010] [Accepted: 07/24/2010] [Indexed: 01/12/2023]
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Phillips SL, Henrich VC, Mace ST. Prevalence of noise-induced hearing loss in student musicians. Int J Audiol 2010; 49:309-16. [DOI: 10.3109/14992020903470809] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Wu HP, Cheng TJ, Tan CT, Guo YL, Hsu CJ. Diabetes impairs recovery from noise-induced temporary hearing loss. Laryngoscope 2009; 119:1190-4. [PMID: 19358251 DOI: 10.1002/lary.20221] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
OBJECTIVES/HYPOTHESIS The purpose of this study is to investigate whether diabetes impairs the recovery from noised-induced temporary hearing loss. METHODS Twenty-eight male Wistar rats were divided into three groups: control, diabetes with insulin control (DI), and diabetes without insulin control (DM). Diabetes was induced by intraperitoneal injection of streptozotocin. All animals were exposed to white noise at 110 dB SPL for 8 hours. Auditory brainstem response (ABR) thresholds and distortion product otoacoustic emission (DPOAE) amplitudes were measured for all animals 1 day prior to noise exposure to obtain a baseline for hearing function, and then 1 hour, 1 day, 2 days, 4 days, 7 days, and 14 days after noise exposure. RESULTS One hour post exposure, ABR thresholds shifted markedly, and DPOAE was reduced similarly in all groups. Both ABR thresholds and DPOAE returned to the baseline in the control group at day 1, but they were not back to the baseline in the DM group even by day 14. Compared with the control group, the ABR threshold shifts and DPOAE returned to baseline more slowly in the DI group. CONCLUSIONS The present study suggests that diabetic patients need proper blood sugar control and probably need more effective preventive measures to preserve their hearing from the effects of noise. Laryngoscope, 2009.
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Affiliation(s)
- Hung-Pin Wu
- Institute of Occupational Medicine and Industrial Hygiene, National Taiwan University, Taipei, Taiwan.
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Li H, Steyger PS. Synergistic ototoxicity due to noise exposure and aminoglycoside antibiotics. Noise Health 2009; 11:26-32. [PMID: 19265251 DOI: 10.4103/1463-1741.45310] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Acoustic exposure to high intensity and/or prolonged noise causes temporary or permanent threshold shifts in auditory perception, reflected by reversible or irreversible damage in the cochlea. Aminoglycoside antibiotics, used for treating or preventing life-threatening bacterial infections, also induce cytotoxicity in the cochlea. Combined noise and aminoglycoside exposure, particularly in neonatal intensive care units, can lead to auditory threshold shifts greater than simple summation of the two insults. The synergistic toxicity of acoustic exposure and aminoglycoside antibiotics is not limited to simultaneous exposures. Prior acoustic insult which does not result in permanent threshold shifts potentiates aminoglycoside ototoxicity. In addition, exposure to subdamaging doses of aminoglycosides aggravates noise-induced cochlear damage. The mechanisms by which aminoglycosides cause auditory dysfunction are still being unraveled, but likely include the following: 1) penetration into the endolymphatic fluid of the scala media, 2) permeation of nonselective cation channels on the apical surface of hair cells, and 3) generation of toxic reactive oxygen species and interference with other cellular pathways. Here we discuss the effect of combined noise and aminoglycoside exposure to identify pivotal synergistic events that can potentiate ototoxicity, in addition to a current understanding of aminoglycoside trafficking within the cochlea. Preventing the ototoxic synergy of noise and aminoglycosides is best achieved by using non-ototoxic bactericidal drugs, and by attenuating perceived noise intensity when life-saving aminoglycoside therapy is required.
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Affiliation(s)
- Hongzhe Li
- Oregon Hearing Research Center, Oregon Health and Science University, Portland, Oregon, USA
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Abstract
High-intensity and/or prolonged exposure to noise causes temporary or permanent threshold shifts in auditory perception. Occupational exposure to solvents or administration of clinically important drugs, such as aminoglycoside antibiotics and cisplatin, also can induce permanent hearing loss. The mechanisms by which these ototoxic insults cause auditory dysfunction are still being unraveled, yet they share common sequelae, particularly generation of reactive oxygen species, that ultimately lead to hearing loss and deafness. Individuals are frequently exposed to ototoxic chemical contaminants (e.g., fuel) and noise simultaneously in a variety of work and recreational environments. Does simultaneous exposure to chemical ototoxins and noise potentiate auditory dysfunction? Exposure to solvent vapor in noisy environments potentiates the permanent threshold shifts induced by noise alone. Moderate noise levels potentiate both aminoglycoside- and cisplatin-induced ototoxicity in both rate of onset and in severity of auditory dysfunction. Thus, simultaneous exposure to chemical ototoxins and moderate levels of noise can potentiate auditory dysfunction. Preventing the ototoxic synergy of noise and chemical ototoxins requires removing exposure to ototoxins and/or attenuating noise exposure levels when chemical ototoxins are present.
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Affiliation(s)
- Peter S Steyger
- Oregon Hearing Research Center, Oregon Health, Sciences University, Portland, Oregon
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Long-term administration of magnesium after acoustic trauma caused by gunshot noise in guinea pigs. Hear Res 2008; 247:137-45. [PMID: 19084059 DOI: 10.1016/j.heares.2008.11.005] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/07/2008] [Revised: 10/23/2008] [Accepted: 11/05/2008] [Indexed: 12/20/2022]
Abstract
In a previous study we observed that a 7-day post-trauma magnesium treatment significantly reduced auditory threshold shifts measured 7 days after gunshot noise exposure. However this improvement was only temporary, suggesting that it could be potentially beneficial to prolong this treatment. The aim of the present study was to evaluate the efficacy of a long-term (1 month) magnesium treatment after an impulse noise trauma, in comparison with either a 7-day magnesium treatment, an administration of methylprednisolone (conventional treatment), or a placebo (NaCl). Guinea pigs were exposed to impulse noise (three blank gunshots, 170 dB SPL peak). They received one of the four treatments, 1 h after the noise exposure. Auditory function was explored by recording the auditory brainstem response (ABR) and measuring the distortion product otoacoustic emissions (DPOAE) over a 3-month recovery period after the gunshot exposure. The functional hearing study was supplemented by a histological analysis. The results showed that a 1-month treatment with magnesium was the most effective treatment in terms of hair cell preservation. The DPOAE confirmed this effectiveness. Methylprednisolone accelerated recovery but its final efficacy remained moderate. It is probable that magnesium acts on the later metabolic processes that occur after noise exposure. Multiple mechanisms could be involved: calcium antagonism, anti-ischaemic effect or NMDA channel blockage. Regardless of the specific mechanism, a 1-month treatment with magnesium clearly attenuates NIHL, and presents the advantage of being safe for use in humans.
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Talaska AE, Schacht J, Fischel-Ghodsian N. Molecular and genetic aspects of aminoglycoside-induced hearing loss. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.ddmec.2006.03.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Finneran JJ, Carder DA, Dear R, Belting T, McBain J, Dalton L, Ridgway SH. Pure tone audiograms and possible aminoglycoside-induced hearing loss in belugas (Delphinapterus leucas). THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2005; 117:3936-43. [PMID: 16018495 DOI: 10.1121/1.1893354] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
A behavioral response paradigm was used to measure pure-tone hearing sensitivities in two belugas (Delphinapterus leucas). Tests were conducted over a 20-month period at the Point Defiance Zoo and Aquarium, in Tacoma, WA. Subjects were two males, aged 8-10 and 9-11 during the course of the study. Subjects were born in an oceanarium and had been housed together for all of their lives. Hearing thresholds were measured using a modified up/down staircase procedure and acoustic response paradigm where subjects were trained to produce audible responses to test tones and to remain quiet otherwise. Test frequencies ranged from approximately 2 to 130 kHz. Best sensitivities ranged from approximately 40 to 50 dB re 1 microPa at 50-80 kHz and 30-35 kHz for the two subjects. Although both subjects possessed traditional "U-shaped" mammalian audiograms, one subject exhibited significant high-frequency hearing loss above 37 kHz compared to previously published data for belugas. Hearing loss in this subject was estimated to approach 90 dB for frequencies above 50 kHz. Similar ages, ancestry, and environmental conditions between subjects, but a history of ototoxic drug administration in only one subject, suggest that the observed hearing loss was a result of the aminoglycoside antibiotic amikacin.
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Affiliation(s)
- James J Finneran
- U.S. Navy Marine Mammal Program, Space and Naval Warfare Systems Center, San Diego, Code 2351, 53560 Hull Street, San Diego, California 92152-5001, USA.
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Su MC, Lee SY, Tan CT, Su CC, Li SY, Lin RH, Hung CC, Lin MJ. Taicatoxin inhibits the calcium-dependent slow motility of mammalian outer hair cells. Hear Res 2005; 203:172-9. [PMID: 15855042 DOI: 10.1016/j.heares.2004.12.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2004] [Accepted: 12/15/2004] [Indexed: 10/26/2022]
Abstract
The effects of taicatoxin on the slow motility of isolated outer hair cells of guinea pig were studied in the experiments. Pretreatment with taicatoxin (0.19 microM) was able to prevent both the cell shortening induced by high K(+) (50mM), and the cell elongation induced by ionomycin (10 microM). These effects of taicatoxin can be mimicked by pretreatment of cells with Ca(2+)-free medium on the slow motility in response to ionomycin or high K(+). Pretreatment with neither calcium channel blockers such as nifedipine (L-type blocker), omega-conotoxin GVIA (N-type blocker), and omega-agatoxin IVA (P-type blocker); nor potassium channel blockers, such as tetraethylammonium chloride (TEA) and 3,4-diaminopyridine (3,4-DAP) can antagonize the cell shortening effect induced by high K(+) and cell elongation induced by ionomycin. The calcium-imaging experiment indicated that taicatoxin, but not nifedipine, did prevent an increase of intracellular Ca(2+) level significantly induced by high K(+). These results demonstrate that the effect of taicatoxin was to block the calcium entry through calcium channels of cell membrane, without relative to its properties of potassium channel blockers. We conclude that taicatoxin-sensitive-calcium channels at least impart, play a significant role in the slow motility of outer hair cell.
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Affiliation(s)
- Mao-Chang Su
- Department of Otolaryngology, Chung Shan Medical University Hospital, Taiwan
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Perez R, Freeman S, Sohmer H. Effect of an initial noise induced hearing loss on subsequent noise induced hearing loss. Hear Res 2004; 192:101-6. [PMID: 15157968 DOI: 10.1016/j.heares.2004.01.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2003] [Accepted: 01/25/2004] [Indexed: 11/21/2022]
Abstract
The effect of previous noise induced hearing loss (NIHL) on subsequent NIHL was studied in rats. Three groups of animals were initially exposed to different durations of 113 dB SPL broad band noise (21 days, 3 days or 0 days--unexposed). Their permanent threshold shifts (PTS) from this exposure (PTS1) were evaluated using auditory nerve-brainstem evoked responses (ABR). All the animals were then noise-exposed for an additional 12 days, and the incremental PTS following this exposure (PTS2) was also assessed. The 21 day group showed the greater PTS1 [mean +/- SD: 27.03 +/- 6.78 dB, compared with 11.67 +/- 10.47 dB (3 day group)] and the lowest PTS2 [9.84 +/- 8.19 dB, compared with 13.33 +/- 14.60 dB (3 day group) and 24.04 +/- 12.4 dB (0 day group)]. This group also showed the highest total PTS and lowest SD following the two noise exposures [36.88 +/- 6.29 dB, compared with 25.00 +/- 12.68 dB (3 day group) and 26.35 +/- 11.93 dB (0 day group)]. The results may be explained by the lower effective intensity of the second noise exposure for the animals with a large PTS1 compared to those with little or no NIHL from the first noise exposure.
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Affiliation(s)
- Ronen Perez
- Department of Otolaryngology and Head and Neck Surgery, Shaare Zedek Medical Center, P.O. Box 3235, Jerusalem 91031, Israel
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Lin MJ, Su MC, Tan CT, Su CC, Li SY, Lin RH, Lin-Shiau SY, Hung CC, Lee SY. The effect of L-arginine on slow motility of mammalian outer hair cell. Hear Res 2003; 178:52-8. [PMID: 12684177 DOI: 10.1016/s0378-5955(03)00030-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The effect of L-arginine on the slow motility of mammalian cochlear outer hair cells was studied in this experiment. L-Arginine (3 mM) but not D-arginine (3 mM) or other amino acids (L-aspartate or L-glutamate) induced length increases of guinea pig outer hair cell. Similarly, the membrane-permeant cGMP analogues, 8-(4-chlorophenylthio)guanosine 3':5'-cyclic monophosphate (1 mM) or 8-bromo-guanosine 3':5'-cyclic monophosphate (1 mM) induced length increases of guinea pig outer hair cells. These length increases induced by L-arginine can be attenuated by a 30 min preincubation of the cells with the nitric oxide synthase inhibitors N(G)-nitro-L-arginine methyl ester hydrochloride (3 mM) or 7-nitroindazole (1 mM). Comparing the effects of L-arginine and ionomycin on cell length and intracellular calcium change in outer hair cells, both L-arginine and ionomycin were able to induce the elongation of outer hair cells but L-arginine did not change the fluorescence intensity of Fluo-3. Preincubation of the cells with EGTA (3 mM) for 40 min to reduce the extracellular calcium concentration did not influence the effect of L-arginine. This experiment demonstrated that nitric oxide/cGMP pathway involvement in regulating the slow motility of mammalian outer hair cells cannot be ruled out. The effect of L-arginine is independent of extracellular calcium concentration.
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Affiliation(s)
- Min-Jon Lin
- Department of Life Sciences, Chung Shan Medical University, Taichung City, Taiwan.
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