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Aarhus L, Sand M, Engdahl B. COPD and 20-year hearing decline: The HUNT cohort study. Respir Med 2023; 212:107221. [PMID: 37023869 DOI: 10.1016/j.rmed.2023.107221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 03/14/2023] [Accepted: 03/22/2023] [Indexed: 04/08/2023]
Abstract
BACKGROUND We aimed to assess the association between chronic obstructive pulmonary disease (COPD) and long-term hearing decline. A further aim was to study sex differences. METHODS Population-based cohort study in Norway (the HUNT study) with baseline measurements in 1996-1998 and follow-up in 2017-2019. The sample included 12,082 participants (43% men, mean age at follow-up 64 years). We used multiple linear regression to assess the association between COPD (minimum one registered ICD-10 code with emphysema or other COPDs during follow-up) and 20-year hearing decline in the low/mid/high frequency area (0.25-0.5/1-2/3-8 kHz). We adjusted for age, sex, education, smoking, noise exposure, ear infections, hypertension and diabetes. RESULTS Persons registered with COPD (N = 403) had larger 20-year hearing decline at low frequencies (1.5 dB, 95% confidence interval (CI) 0.6-2.3) and mid frequencies (1.2 dB, 95% CI 0.4-2.1), but not at high frequencies. At high frequencies, the association was stronger and statistically significant only among women (1.9 dB, 95% CI 0.6-3.2). Persons registered with both COPD and respiratory failure (N = 19) had larger 20-year hearing decline at low and mid frequencies: 7.4 dB (95% CI 3.6-11.2) and 4.5 dB (95% CI 0.7-8.4), respectively. CONCLUSION Our large cohort study shows an association between COPD and increased long-term hearing decline. Women seem to be more susceptible to COPD-related hearing loss at high frequencies. The findings support that COPD can affect the cochlear function.
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Affiliation(s)
- Lisa Aarhus
- Department of Occupational Medicine and Epidemiology, National Institute of Occupational Health, Oslo, Norway; Department of Internal Medicine, Diakonhjemmet Hospital, Oslo, Norway.
| | - Morten Sand
- Department of Internal Medicine, Diakonhjemmet Hospital, Oslo, Norway
| | - Bo Engdahl
- Department of Chronic Diseases and Ageing, Norwegian Institute of Public Health, Oslo, Norway
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2
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Lu CW, Huang ST, Cheng SJ, Lin CT, Hsu YC, Yao CT, Dong F, Hung CM, Kuo HC. Genomic architecture underlying morphological and physiological adaptation to high elevation in a songbird. Mol Ecol 2023; 32:2234-2251. [PMID: 36748940 DOI: 10.1111/mec.16875] [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: 11/04/2022] [Revised: 01/17/2023] [Accepted: 02/03/2023] [Indexed: 02/08/2023]
Abstract
Organisms often acquire physiological and morphological modifications to conquer ecological challenges when colonizing new environments which lead to their adaptive evolution. However, deciphering the genomic mechanism of ecological adaptation is difficult because ecological environments are often too complex for straightforward interpretation. Thus, we examined the adaptation of a widespread songbird-the rufous-capped babbler (Cyanoderma ruficeps)-to a relatively simple system: distinct environments across elevational gradients on the mountainous island of Taiwan. We focused on the genomic sequences of 43 birds from five populations to show that the Taiwan group split from its sister group in mainland China around 1-2 million years ago (Ma) and colonized the montane habitats of Taiwan at least twice around 0.03-0.22 Ma. The montane and lowland Taiwan populations diverged with gene flow between them, suggesting strong selection associated with different elevations. We found that the montane babblers had smaller beaks than the lowland ones, consistent with Allen's rule, and identified candidate genes-COL9A1 and SOX11-underlying the beak size changes. We also found that altitudinally divergent mutations were mostly located in noncoding regions and tended to accumulate in chromosomal inversions and autosomes. The altitudinally divergent mutations might regulate genes related to haematopoietic, metabolic, immune, auditory and vision functions, as well as cerebrum morphology and plumage development. The results reveal the genomic bases of morphological and physiological adaptation in this species to the low temperature, hypoxia and high UV light environment at high elevation. These findings improve our understanding of how ecological adaptation drives population divergence from the perspective of genomic architecture.
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Affiliation(s)
- Chia-Wei Lu
- Biodiversity Research Center, Academia Sinica, Taipei, Taiwan
| | - Shih-Ting Huang
- Biodiversity Research Center, Academia Sinica, Taipei, Taiwan
| | - Shun-Jen Cheng
- Department of Natural Resources and Environmental Studies, National Dong Hwa University, Hualien, Taiwan
| | - Chen-Tau Lin
- Biodiversity Research Center, Academia Sinica, Taipei, Taiwan
| | - Yu-Cheng Hsu
- Department of Natural Resources and Environmental Studies, National Dong Hwa University, Hualien, Taiwan
| | - Cheng-Te Yao
- Division of Zoology, Endemic Species Research Institute, Nantou, Taiwan
| | - Feng Dong
- Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan, China
| | - Chih-Ming Hung
- Biodiversity Research Center, Academia Sinica, Taipei, Taiwan
| | - Hao-Chih Kuo
- Biodiversity Research Center, Academia Sinica, Taipei, Taiwan
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Moreira A, Croze M, Delehelle F, Cussat-Blanc S, Luga H, Mollereau C, Balaresque P. Hearing Sensitivity of Primates: Recurrent and Episodic Positive Selection in Hair Cells and Stereocilia Protein-Coding Genes. Genome Biol Evol 2021; 13:6302699. [PMID: 34137817 PMCID: PMC8358225 DOI: 10.1093/gbe/evab133] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/06/2021] [Indexed: 12/29/2022] Open
Abstract
The large spectrum of hearing sensitivity observed in primates results from the impact of environmental and behavioral pressures to optimize sound perception and localization. Although evidence of positive selection in auditory genes has been detected in mammals including in Hominoids, selection has never been investigated in other primates. We analyzed 123 genes highly expressed in the inner ear of 27 primate species and tested to what extent positive selection may have shaped these genes in the order Primates tree. We combined both site and branch-site tests to obtain a comprehensive picture of the positively selected genes (PSGs) involved in hearing sensitivity, and drew a detailed description of the most affected branches in the tree. We chose a conservative approach, and thus focused on confounding factors potentially affecting PSG signals (alignment, GC-biased gene conversion, duplications, heterogeneous sequencing qualities). Using site tests, we showed that around 12% of these genes are PSGs, an α selection value consistent with average human genome estimates (10-15%). Using branch-site tests, we showed that the primate tree is heterogeneously affected by positive selection, with the black snub-nosed monkey, the bushbaby, and the orangutan, being the most impacted branches. A large proportion of these genes is inclined to shape hair cells and stereocilia, which are involved in the mechanotransduction process, known to influence frequency perception. Adaptive selection, and more specifically recurrent adaptive evolution, could have acted in parallel on a set of genes (ADGRV1, USH2A, PCDH15, PTPRQ, and ATP8A2) involved in stereocilia growth and the whole complex of bundle links connecting them, in species across different habitats, including high altitude and nocturnal environments.
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Affiliation(s)
- Andreia Moreira
- Anthropologie Moléculaire et Imagerie de Synthèse (AMIS), Faculté de Médecine Purpan, CNRS UMR5288, Université de Toulouse, Université Toulouse III Paul Sabatier, France.,Institut de Recherche en Informatique de Toulouse (IRIT), CNRS UMR5505, Université Toulouse III Paul Sabatier, France
| | - Myriam Croze
- Anthropologie Moléculaire et Imagerie de Synthèse (AMIS), Faculté de Médecine Purpan, CNRS UMR5288, Université de Toulouse, Université Toulouse III Paul Sabatier, France
| | - Franklin Delehelle
- Anthropologie Moléculaire et Imagerie de Synthèse (AMIS), Faculté de Médecine Purpan, CNRS UMR5288, Université de Toulouse, Université Toulouse III Paul Sabatier, France.,Institut de Recherche en Informatique de Toulouse (IRIT), CNRS UMR5505, Université Toulouse III Paul Sabatier, France
| | - Sylvain Cussat-Blanc
- Institut de Recherche en Informatique de Toulouse (IRIT), CNRS UMR5505, Université Toulouse III Paul Sabatier, France
| | - Hervé Luga
- Institut de Recherche en Informatique de Toulouse (IRIT), CNRS UMR5505, Université Toulouse III Paul Sabatier, France
| | - Catherine Mollereau
- Anthropologie Moléculaire et Imagerie de Synthèse (AMIS), Faculté de Médecine Purpan, CNRS UMR5288, Université de Toulouse, Université Toulouse III Paul Sabatier, France
| | - Patricia Balaresque
- Anthropologie Moléculaire et Imagerie de Synthèse (AMIS), Faculté de Médecine Purpan, CNRS UMR5288, Université de Toulouse, Université Toulouse III Paul Sabatier, France
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Risk Stratification for Immediate Postoperative Hearing Loss by Preoperative BAER (Brainstem Auditory Evoked Response) and Audiometry in NF2-Associated Vestibular Schwannomas. Cancers (Basel) 2021; 13:cancers13061384. [PMID: 33803788 PMCID: PMC8003145 DOI: 10.3390/cancers13061384] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Revised: 03/15/2021] [Accepted: 03/16/2021] [Indexed: 11/16/2022] Open
Abstract
Simple Summary Hearing preservation is one of the major goals in the surgical treatment of Neurofibromatosis Type 2 (NF2) associated vestibular schwannomas (VS) and hearing diagnostics are important monitoring parameters and intraoperative tools to pursue this goal. Our monocentric retrospective analysis aimed to predict postoperative hearing deterioration or loss based on preoperative audiometry and neurophysiological (brainstem auditory evoked potentials, BAEP) findings. In this respect and according to our data evaluation in 100 NF2-associated VS of 72 patients both parameters seem to be prognostic markers, particularly BAEP findings. Large discrepancies between both audiometry and BAEPs which were identified in twenty-one cases of our cohort appear to be at high risk of significant postoperative hearing worsening. Abstract Both brainstem auditory evoked potentials (BAEP) and audiometry play a crucial role in neuro-oncological treatment decisions in Neurofibromatosis Type 2 associated (NF2) vestibular schwannoma (VS) as hearing preservation is the major goal. In this study, we investigated the risk of immediate postoperative hearing deterioration (>15 dB and/or 15% loss in pure-tone average [PTA]/ speech discrimination score [SDS] in a cohort of 100 operated VS (ears) in 72 NF2 patients by retrospective analysis of pre- and postoperative hearing data (PTA, SDS, American Association of Otolaryngology–Head and Neck Surgery [AAO-HNS], and brainstem auditory evoked potential [BAEP] class) taking into account relevant influencing factors, particularly preoperative audiometry and BAEP status and the extent of resection. Immediately after surgery, the hearing was preserved in 73% of ears and approximately ~60% of ears kept their hearing classes. Preoperative BAEP (p = 0.015) and resection amount (p = 0.048) significantly influenced postoperative hearing outcome. The prediction model for postoperative hearing deterioration/loss between preoperative BAEP and AAO-HNS class showed increased risk by increasing BAEP class. Twenty-one tumors/ears were identified with large BAEP and AAO-HNS class discrepancies (≥2 points) and were associated with a high (48–100%) risk of deafness after surgery in ears with preoperative available hearing. Overall, the results were heterogeneous but the better both BAEP and audiometry class before surgery, the higher the chance of hearing maintenance afterwards. Large resection amounts (e.g., 100% risk in near-total resections) exhibit a significant (p < 0.05) higher risk compared to smaller amounts (e.g., 10/20% in laser-coagulated/partially resected tumors). Our results emphasized the indispensable role of both hearing monitoring in form of audiometry and neurophysiology (BAEP) in the pre-and perioperative monitoring of NF2-associated VS. Both BAEP and audiometry are good prognostic markers for the postoperative hearing outcome. The extent of resection should be strictly guided by and adjusted to the intraoperative neurophysiological monitoring.
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Li CZ, Li CC, Lin MC, Tseng WS. Sudden hearing loss following acute carbon monoxide poisoning: A case report and literature review. HONG KONG J EMERG ME 2020. [DOI: 10.1177/1024907920969306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Introduction: Acute carbon monoxide (CO) poisoning could lead to headache, dizziness, myocardial injury, neurological sequela, and death. Sudden hearing loss is a rare symptom of acute CO poisoning. Case Presentation: Here, we report a case of a 42-year-old woman who suffered from acute hearing loss after exposure to a suicidal environment of high concentration of CO. Partial recovery of hearing was demonstrated after a combination of corticosteroid and hyperbaric oxygen therapy was given. Discussion: The mechanism of sudden hearing loss caused by acute CO poisoning is not well-established. It is believed to be related with the hypoxic damage to the cochlea. The characteristic of sudden hearing loss caused by acute CO poisoning is that it often affects in high frequency bilaterally. Conclusion: This report would prompt the clinician in early recognition of this sudden hearing loss of uncommon etiology.
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Affiliation(s)
- Chiao-Zhu Li
- Department of Surgery, Kaohsiung Armed Forces General Hospital, Kaohsiung City, Taiwan, ROC
- Department of Neurological Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei city, Taiwan, ROC
| | - Chiao-Ching Li
- Department of Surgery, Kaohsiung Armed Forces General Hospital, Kaohsiung City, Taiwan, ROC
| | - Meng-Chi Lin
- Department of Neurological Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei city, Taiwan, ROC
- Department of Surgery, Zuoying Branch of Kaohsiung Armed Forces General Hospital, Kaohsiung City, Taiwan, ROC
| | - Wei-Shih Tseng
- Department of Diving and Hyperbaric Medicine, Zuoying Branch of Kaohsiung Armed Forces General Hospital, Kaohsiung City, Taiwan, ROC
- Department of Neurology, Tri-Service General Hospital, National Defense Medical Center, Taipei city, Taiwan, ROC
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Gugel I, Grimm F, Zipfel J, Teuber C, Ernemann U, Kluwe L, Tatagiba M, Mautner VF, Schuhmann MU. Age at Onset and Presenting Symptoms of Neurofibromatosis Type 2 as Prognostic Factors for Clinical Course of Vestibular Schwannomas. Cancers (Basel) 2020; 12:cancers12092355. [PMID: 32825434 PMCID: PMC7563356 DOI: 10.3390/cancers12092355] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Revised: 08/17/2020] [Accepted: 08/18/2020] [Indexed: 11/16/2022] Open
Abstract
The presenting symptoms of the tumor suppressor gene syndrome neurofibromatosis type 2 (NF2) are often non-specific and unrelated to the disease hallmark bilateral vestibular schwannomas (VS). However, age at onset and presenting symptoms may have predictive values for the clinical course of VS. In this retrospective single-center study, we addressed this issue by reviewing 106 patients with 194 VS. Presenting symptoms attributable to VS commonly occur in 87% of adults and 31% of children. Age at onset significantly correlates with tumor volumes at presentation (p = 0.034). In addition, age at onset significantly correlates with pure-tone average (p = 0.0001), speech discrimination scores (p = 0.001), age at beginning of hearing loss (p = 0.0001), age at deafness (p = 0.0001), and age at first surgery (p = 0.0001). Patients presenting with VS related symptoms had significantly (p < 0.05) worse hearing values at presentation and after surgery. These patients also exhibited higher growth rates and tumor volumes compared to patients with non-VS related presenting symptoms, but this difference did not reach the significance level of p < 0.05. Due to the late appearance of these symptoms, the time of beginning hearing loss, surgery and deafness is significantly delayed (p < 0.05) compared to patients not presenting with VS. In summary, age at onset and type of presenting symptom provide excellent prognostic parameters for predicting VS- and hearing-related clinical course.
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Affiliation(s)
- Isabel Gugel
- Department of Neurosurgery, University Hospital Tübingen, 72076 Tübingen, Germany; (F.G.); (J.Z.); (C.T.); (M.T.); (M.U.S.)
- Centre of Neurofibromatosis and Rare Diseases, University Hospital Tübingen, 72076 Tübingen, Germany;
- Correspondence: ; Tel.: +49-7071-2980325; Fax: +49-7071-295245
| | - Florian Grimm
- Department of Neurosurgery, University Hospital Tübingen, 72076 Tübingen, Germany; (F.G.); (J.Z.); (C.T.); (M.T.); (M.U.S.)
| | - Julian Zipfel
- Department of Neurosurgery, University Hospital Tübingen, 72076 Tübingen, Germany; (F.G.); (J.Z.); (C.T.); (M.T.); (M.U.S.)
- Centre of Neurofibromatosis and Rare Diseases, University Hospital Tübingen, 72076 Tübingen, Germany;
- Division of Pediatric Neurosurgery, University Hospital Tübingen, 72076 Tübingen, Germany
| | - Christian Teuber
- Department of Neurosurgery, University Hospital Tübingen, 72076 Tübingen, Germany; (F.G.); (J.Z.); (C.T.); (M.T.); (M.U.S.)
| | - Ulrike Ernemann
- Department of Neuroradiology, University Hospital Tübingen, 72076 Tübingen, Germany;
| | - Lan Kluwe
- Department of Neurology, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany;
- Department of Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany
| | - Marcos Tatagiba
- Department of Neurosurgery, University Hospital Tübingen, 72076 Tübingen, Germany; (F.G.); (J.Z.); (C.T.); (M.T.); (M.U.S.)
- Centre of Neurofibromatosis and Rare Diseases, University Hospital Tübingen, 72076 Tübingen, Germany;
| | - Victor-Felix Mautner
- Centre of Neurofibromatosis and Rare Diseases, University Hospital Tübingen, 72076 Tübingen, Germany;
- Department of Neurology, University Medical Center Hamburg-Eppendorf, 20251 Hamburg, Germany;
| | - Martin Ulrich Schuhmann
- Department of Neurosurgery, University Hospital Tübingen, 72076 Tübingen, Germany; (F.G.); (J.Z.); (C.T.); (M.T.); (M.U.S.)
- Centre of Neurofibromatosis and Rare Diseases, University Hospital Tübingen, 72076 Tübingen, Germany;
- Division of Pediatric Neurosurgery, University Hospital Tübingen, 72076 Tübingen, Germany
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Byun H, Cho YS, Hong SH, Moon IJ. Cochlear Dead Regions in Sporadic Unilateral Vestibular Schwannomas Using the Threshold-Equalizing Noise Test. Audiol Neurootol 2019; 24:271-278. [PMID: 31665729 DOI: 10.1159/000503164] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Accepted: 09/03/2019] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Vestibular schwannoma (VS) is a benign intracranial neoplasm originating in the Schwann cells of the vestibular nerve. Despite its origin, the most common symptom is sensorineural hearing loss which is presented in more than 90% of patients. The underlying pathophysiology of this hearing loss has not been fully understood. OBJECTIVE To assess the in vivo function of cochlear inner hair cells and spiral ganglion neurons in VS, cochlear dead regions (DRs) were evaluated via the threshold-equalizing noise (TEN) test in untreated VS patients. METHOD Untreated patients diagnosed with sporadic unilateral VS and normal contralesional hearing were enrolled from July 2011 to June 2016. Audiometric evaluation including TEN tests were performed. Based on the magnetic resonance findings, characteristics of individual tumors were assessed. RESULTS The average pure-tone threshold (word recognition score [WRS]) of 23 enrolled patients was 42.7 dB (76.1%). Nineteen DRs (11.8% of 161 tested frequencies) were found in 8 patients (34.8% of enrolled cases). Among the intracanalicular (IAC) tumors, 6 out of 10 ears (60%) carried DRs, while 2 of 13 (15.4%) showed DRs among the cerebellopontine angle (CPA) lesions (p = 0.039). Pure-tone thresholds and WRS were not different between the two groups. Logistic regression analysis showed that the tumor location, IAC versus CPA, was significantly associated with DRs (p = 0.041, Nagelkerke R2 = 0.471), whereas age, sex, tumor size, distance from the tumor to the cochlea, T2-weighted hypointensity on the MRI and pure-tone thresholds showed no significance. CONCLUSIONS Cochlear DRs are detected in hearing losses associated with unilateral sporadic VS using the TEN test. Individual DRs were detected variously in high, mid, or low frequencies. In our preliminary data, IAC tumors showed a higher number of DRs than CPA tumors despite similar average hearing thresholds. Further studies including longitudinal follow-up of hearing as well as change in DRs may provide useful information about VS patients.
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Affiliation(s)
- Hayoung Byun
- Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Hanyang University, Seoul, Republic of Korea
| | - Yang-Sun Cho
- Department of Otorhinolaryngology-Head and Neck Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Sung Hwa Hong
- Department of Otorhinolaryngology-Head and Neck Surgery, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Republic of Korea
| | - Il Joon Moon
- Department of Otorhinolaryngology-Head and Neck Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea,
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Calderón-Garcidueñas L, González-González LO, Kulesza RJ, Fech TM, Pérez-Guillé G, Luna MAJB, Soriano-Rosales RE, Solorio E, Miramontes-Higuera JDJ, Gómez-Maqueo Chew A, Bernal-Morúa AF, Mukherjee PS, Torres-Jardón R, Mills PC, Wilson WJ, Pérez-Guillé B, D'Angiulli A. Exposures to fine particulate matter (PM 2.5) and ozone above USA standards are associated with auditory brainstem dysmorphology and abnormal auditory brainstem evoked potentials in healthy young dogs. ENVIRONMENTAL RESEARCH 2017; 158:324-332. [PMID: 28672130 DOI: 10.1016/j.envres.2017.06.026] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2017] [Revised: 05/29/2017] [Accepted: 06/22/2017] [Indexed: 06/07/2023]
Abstract
BACKGROUND Delayed central conduction times in the auditory brainstem have been observed in Mexico City (MC) healthy children exposed to fine particulate matter (PM2.5) and ozone (O3) above the current United States Environmental Protection Agency (US-EPA) standards. MC children have α synuclein brainstem accumulation and medial superior olivary complex (MSO) dysmorphology. The present study used a dog model to investigate the potential effects of air pollution on the function and morphology of the auditory brainstem. METHODOLOGY Twenty-four dogs living in clean air v MC, average age 37.1 ± 26.3 months, underwent brainstem auditory evoked potential (BAEP) measurements. Eight dogs (4 MC, 4 Controls) were analysed for auditory brainstem morphology and histopathology. RESULTS MC dogs showed ventral cochlear nuclei hypotrophy and MSO dysmorphology with a significant decrease in cell body size, decreased neuronal packing density with regions in the nucleus devoid of neurons and marked gliosis. MC dogs showed significant delayed BAEP absolute wave I, III and V latencies compared to controls. CONCLUSIONS MC dogs show auditory nuclei dysmorphology and BAEPs consistent with an alteration of the generator sites of the auditory brainstem response waveform. This study puts forward the usefulness of BAEPs to study auditory brainstem neurodegenerative changes associated with air pollution in dogs. Recognition of the role of non-invasive BAEPs in urban dogs is warranted to elucidate novel neurodegenerative pathways link to air pollution and a promising early diagnostic strategy for Alzheimer's Disease.
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Affiliation(s)
| | | | - Randy J Kulesza
- Auditory Research Center, Lake Erie College of Osteopathic Medicine, Erie, PA 16509, USA
| | - Tatiana M Fech
- Auditory Research Center, Lake Erie College of Osteopathic Medicine, Erie, PA 16509, USA
| | | | | | | | | | | | | | | | | | - Ricardo Torres-Jardón
- Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Paul C Mills
- The University of Queensland, QLD 4072, Australia
| | | | | | - Amedeo D'Angiulli
- Department of Psychology, Carleton University, Ottawa, Ontario, Canada K1S 5B6
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Ntranos A, Shoirah H, Dhamoon MS, Hahn D, Naidich TP, Shin S. Author response: Clinical Reasoning: A young woman with respiratory failure, hearing loss, and paraplegia. Neurology 2017; 89:979. [DOI: 10.1212/wnl.0000000000004309] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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