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Aimo-Koivisto E, Punakallio L, Järvinen R, Junnila J, Grönthal T, Rantala M. A pilot study of antimicrobial effects and ototoxicity of a Norway spruce (Picea abies) resin-based canine otic rinse product. Vet Dermatol 2024; 35:325-336. [PMID: 38169122 DOI: 10.1111/vde.13229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 06/22/2023] [Accepted: 12/03/2023] [Indexed: 01/05/2024]
Abstract
BACKGROUND Norway spruce (Picea abies) resin-based products are used in human medicine. A resin-based otic rinse also could be useful in supportive care of canine otitis externa (COE), yet information on its antimicrobial effect against canine pathogens or ototoxicity is lacking. OBJECTIVES To investigate the antimicrobial properties and ototoxicity of a commercial resin-based otic product. MATERIALS AND METHODS Antimicrobial effect was evaluated using a standardised challenge test on Staphylococcus pseudintermedius, Corynebacterium auriscanis, Pseudomonas aeruginosa, Escherichia coli, Malassezia pachydermatis, and Streptococcus halichoeri strains to measure reduction in growth after 24 h exposure to the product. Effect on cell morphology was investigated by exposing S. pseudintermedius, C. auriscanis, P. aeruginosa and M. pachydermatis to the product in 20% and 100% (v/v) concentrations for 6, 24 and 48 h, and evaluating cells by transmission (TEM) and scanning (SEM) electron microscopy. An in vitro microbial kill-rate assay also was performed. Auditory brain stem response test, clinical evaluation and postmortem histological evaluation of ear canals were undertaken on experimental guinea pigs treated with the test product or saline controls. RESULTS The product showed >log 5 growth reduction for all strains in the challenge test. TEM and SEM images showed clear changes in the cells' inner structures and deterioration of cells, and 100% (v/v) test product exposure induced microbial killing in 1-2 h. Ototoxicity was not detected in guinea pigs. CONCLUSIONS AND CLINICAL RELEVANCE The product may be an option in supportive care of COE because of antimicrobial effects and lack of ototoxic properties in a guinea pig model.
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Affiliation(s)
- Elina Aimo-Koivisto
- Department of Equine and Small Animal Medicine, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
| | | | | | | | | | - Merja Rantala
- Department of Equine and Small Animal Medicine, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
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Sox10 Gene Is Required for the Survival of Saccular and Utricular Hair Cells in a Porcine Model. Mol Neurobiol 2022; 59:3323-3335. [DOI: 10.1007/s12035-021-02691-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Accepted: 12/08/2021] [Indexed: 10/18/2022]
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Huang Y, Yu H, Liang M, Hou S, Chen J, Zhang F, Sun X, Jia H, Yang J. Hearing Protection Outcomes of Analog Electrode Arrays Coated with Different Drug-Eluting Polymer Films Implanted into Guinea Pig Cochleae. DRUG DESIGN DEVELOPMENT AND THERAPY 2021; 15:3443-3450. [PMID: 34413631 PMCID: PMC8370035 DOI: 10.2147/dddt.s318117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Accepted: 07/13/2021] [Indexed: 12/29/2022]
Abstract
Objective To investigate the hearing protection outcomes of different drug-eluting analog electrode arrays implanted into guinea pig cochleae. Methods Sixty guinea pigs were randomly divided into a negative control group and five experimental groups implanted separately with blank (drug carrier), dexamethasone (DXM), aracytine (Ara-C), Ara-C+DXM, and nicotinamide adenine dinucleotide (NAD+) eluting analog electrode arrays. Micro CT was used to supervise the surgical procedure. Auditory brainstem response (ABR) thresholds of the guinea pigs were measured and analyzed. Results and Conclusions Compared with the negative control, all other groups showed a significant increase in ABR threshold (p<0.001) after surgery. Among them, there was no obvious difference between the blank (0 vs 90 days: 59.70±10.57 vs 64.60±9.47 dB SPL) and the NAD+ group (0 vs 90 days: 59.90±9.87 vs 64.70±8.65 dB SPL). On the other hand, the ABR thresholds in the DXM (0 days: 58.10±10.73 dB SPL; 90 days: 51.70±9.07 dB SPL) and the Ara-C group (0 days: 59.00±10.05 dB SPL; 90 days: 51.60±8.48 dB SPL) decreased significantly compared with the former two groups (p<0.001). However, the Ara-C+DXM group showed no further benefit (p>0.05). In addition, a significantly higher survival rate of spiral ganglion neurons in cochleae was observed in the Ara-C and/or DXM groups.
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Affiliation(s)
- Yuyu Huang
- Department of Otorhinolaryngology Head and Neck Surgery, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200092, People's Republic of China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases (14DZ2260300), Shanghai, 200125, People's Republic of China
| | - Haoran Yu
- ENT Institute and Department of Otorhinolaryngology, Eye & ENT Hospital, Fudan University, Shanghai, 200031, People's Republic of China
| | - Min Liang
- Department of Otorhinolaryngology Head and Neck Surgery, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200092, People's Republic of China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases (14DZ2260300), Shanghai, 200125, People's Republic of China
| | - Shule Hou
- Department of Otorhinolaryngology Head and Neck Surgery, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200092, People's Republic of China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases (14DZ2260300), Shanghai, 200125, People's Republic of China
| | - Junmin Chen
- Department of Otorhinolaryngology Head and Neck Surgery, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200092, People's Republic of China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases (14DZ2260300), Shanghai, 200125, People's Republic of China
| | - Fan Zhang
- Department of Otorhinolaryngology Head and Neck Surgery, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200092, People's Republic of China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases (14DZ2260300), Shanghai, 200125, People's Republic of China
| | - Xiayu Sun
- Department of Otorhinolaryngology Head and Neck Surgery, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200092, People's Republic of China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases (14DZ2260300), Shanghai, 200125, People's Republic of China
| | - Huan Jia
- Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases (14DZ2260300), Shanghai, 200125, People's Republic of China.,Department of Otorhinolaryngology Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200011, People's Republic of China.,Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, 200031, People's Republic of China
| | - Jun Yang
- Department of Otorhinolaryngology Head and Neck Surgery, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200092, People's Republic of China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases (14DZ2260300), Shanghai, 200125, People's Republic of China.,Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, 200031, People's Republic of China
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Hu J, Chen Z, Zhang Y, Xu Y, Ma W, Zhang Y, Wang J, Chen Y, Xu M, Yang H, Zhang Q. Vestibular dysfunction in patients with auditory neuropathy detected by vestibular evoked myogenic potentials. Clin Neurophysiol 2020; 131:1664-1671. [PMID: 32089450 DOI: 10.1016/j.clinph.2020.02.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Revised: 01/15/2020] [Accepted: 02/05/2020] [Indexed: 11/29/2022]
Abstract
OBJECTIVES This study aimed to determine vestibular involvement in patients with auditory neuropathy (AN) using ocular vestibular evoked myogenic potential (oVEMP), cervical vestibular evoked myogenic potential (cVEMP), caloric tests, video Head Impulse Tests (vHIT), and Suppression Head Impulse Paradigm (SHIMP) tests. METHODS Twenty-two patients with AN (study group) and 50 age-and-gender-matched healthy subjects (control group) were enrolled. All patients underwent air-conducted sound oVEMP and cVEMP tests. In the study group, 20 patients underwent a caloric test, 10 patients underwent a video Head Impulse Test (vHIT), and nine patients underwent the Suppression Head Impulse Paradigm (SHIMP) test. RESULTS Significant differences in VEMP abnormalities were found between the two groups. Most AN patients showed no VEMP response, while only a few patients showed VEMP responses with normal parameters. Some AN patients presented abnormal VEMP parameters, including thresholds, latencies, and amplitudes. The abnormal rate (including no response and abnormal parameters) was 91% in the cVEMP test and 86% in the oVEMP test. No significant difference was found between oVEMP and cVEMP abnormalities. AN patients exhibited a 70% abnormal rate in the caloric test. Most AN patients showed normal VOR gains. Most patients showed no overt corrective saccades in vHIT, and exhibited normal anticompensatory saccades in the SHIMP test. CONCLUSION Many AN patients experience vestibular dysfunction, which may be detected by using a vestibular functional test battery. SIGNIFICANCE VEMP abnormalities might reflect the status and degree of vestibular involvement in AN.
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Affiliation(s)
- Juan Hu
- Department of Otorhinolaryngology, Head and Neck Surgery, The 2nd Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, Shaanxi Province, PR China
| | - Zichen Chen
- Department of Otorhinolaryngology, Head and Neck Surgery, The 2nd Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, Shaanxi Province, PR China
| | - Yuzhong Zhang
- Department of Otorhinolaryngology, Head and Neck Surgery, The 2nd Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, Shaanxi Province, PR China
| | - Yong Xu
- Department of Otorhinolaryngology, Head and Neck Surgery, The 2nd Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, Shaanxi Province, PR China; Department of Otorhinolaryngology, Head and Neck Surgery, Yanliang 141 Hospital, Xi'an 710089, Shaanxi Province, PR China
| | - Weijun Ma
- Department of Otorhinolaryngology, Head and Neck Surgery, The 2nd Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, Shaanxi Province, PR China
| | - Yan Zhang
- Department of Otorhinolaryngology, Head and Neck Surgery, The 2nd Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, Shaanxi Province, PR China
| | - Junli Wang
- Department of Otorhinolaryngology, Head and Neck Surgery, The 2nd Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, Shaanxi Province, PR China
| | - Yanfei Chen
- Department of Otorhinolaryngology, Head and Neck Surgery, The 2nd Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, Shaanxi Province, PR China
| | - Min Xu
- Department of Otorhinolaryngology, Head and Neck Surgery, The 2nd Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, Shaanxi Province, PR China
| | - Hui Yang
- Department of Otorhinolaryngology, Head and Neck Surgery, The 2nd Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, Shaanxi Province, PR China.
| | - Qing Zhang
- Department of Otorhinolaryngology, Head and Neck Surgery, The 2nd Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, Shaanxi Province, PR China; Department of Otorhinolaryngology, Head and Neck Surgery, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200092, PR China.
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Cooper TK, Byrum RA, Cooper K, DeWald LE, Aiosa NM, Feuerstein IM, St Claire MC. Cranial Vena Cava Syndrome in Guinea Pigs with Chronic Jugular Vein Catheters. Comp Med 2020; 70:87-92. [PMID: 31948513 PMCID: PMC7024777 DOI: 10.30802/aalas-cm-19-000051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Revised: 06/17/2019] [Accepted: 06/27/2019] [Indexed: 11/05/2022]
Abstract
Guinea pigs are a premier small animal model for infectious disease research, and chronic indwelling venous access ports may be used to facilitate various procedures. Here we report catheter-related lesions in 5 uninfected Dunkin-Hartley guinea pigs with chronic jugular vein catheters used for imaging studies. Three guinea pigs were found dead with no premonitory signs. At necropsy, there was severe bilateral pulmonary atelectasis due to 20 to 29 mL of pleural effusion resulting from catheter-related thrombosis and cranial vena cava syndrome. In addition, one of these 3 guinea pigs had a polymicrobial catheter infection with abscessation. A 4th clinically normal guinea pig was euthanized at the end of the study, having spontaneously lost its catheter 7 mo prior, and had 17 mL of pleural effusion. The 5th guinea pig was euthanized following pooling of contrast material around the distal catheter in the cranial vena cava on CT. By histology, affected animals had recent and remote thrombosis or fibrosis (or both) of the cranial vena cava and right atrial wall, with osseous and cartilaginous metaplasia. Cranial vena cava syndrome should be considered as a differential for dyspnea or death in chronically catheterized laboratory animals.
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Affiliation(s)
- Timothy K Cooper
- Integrated Research Facility at Fort Detrick, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Fort Detrick, Frederick, Maryland;,
| | - Russell A Byrum
- Integrated Research Facility at Fort Detrick, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Fort Detrick, Frederick, Maryland
| | - Kurt Cooper
- Integrated Research Facility at Fort Detrick, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Fort Detrick, Frederick, Maryland
| | | | - Nina M Aiosa
- Integrated Research Facility at Fort Detrick, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Fort Detrick, Frederick, Maryland
| | - Irwin M Feuerstein
- Integrated Research Facility at Fort Detrick, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Fort Detrick, Frederick, Maryland
| | - Marisa C St Claire
- Integrated Research Facility at Fort Detrick, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Fort Detrick, Frederick, Maryland
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Yang TH, Young YH. Eradicating Otomycosis with Terbinafine Solution: Basic and Clinical Investigation. Audiol Neurootol 2019; 24:183-190. [PMID: 31454819 DOI: 10.1159/000501540] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Accepted: 06/17/2019] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Otomycosis still remains intractable in clinical practice, likely because topical antifungal agents lack efficacy or are potentially toxic to the inner ear end organs. OBJECTIVES The aim of this study was to investigate whether terbinafine solution is a potential candidate for treating intractable otomycosis in humans. In addition, the toxic effect on the inner ear was also assessed by animal models treated with terbinafine. METHODS Guinea pigs were instilled with 0.1 mL terbinafine (10 and 25 mg/mL) in the left round window membrane. At 2 weeks after treatment, all animals underwent an inner ear test battery and were then sacrificed for morphological study. Clinically, 20 patients with otomycosis were treated with terbinafine solution at a dosage of 0.4 mg. RESULTS All terbinafine-treated animals showed intact inner ear function when total dosage of terbinafine was <2.5 mg, which was further confirmed by morphological study. Subsidence of otomycosis was achieved in all 20 patients 1 week after treatment with terbinafine (0.4 mg) without untoward effect. No evidence of recurrence was noted 1 year after treatment. CONCLUSION The paucity of inner ear toxicity of terbinafine even at a dosage of 2.5 mg was identified in guinea pig models morphologically and physiologically. Topical application of terbinafine solution at a dosage of 0.4 mg may be a potential treatment for otomycosis in humans.
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Affiliation(s)
- Ting-Hua Yang
- Department of Otolaryngology, National Taiwan University Hospital, Taipei, Taiwan
| | - Yi-Ho Young
- Department of Otolaryngology, National Taiwan University Hospital, Taipei, Taiwan,
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