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Tawk K, Kim JK, Frank M, Goshtasbi K, Abouzari M, Djalilian HR. Correlation Between Laterality of Hearing Loss and Migraine Features in Menière's Disease. Otol Neurotol 2023; 44:651-655. [PMID: 37317519 PMCID: PMC10370460 DOI: 10.1097/mao.0000000000003925] [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] [Indexed: 06/16/2023]
Abstract
OBJECTIVES The objective of this study is to understand whether the hearing loss laterality in Menière's disease (MD) correlates with migraine symptoms laterality such as headache, neck stiffness, and otalgia. METHODS We performed a retrospective review of prospectively obtained data on patients presenting between September 2015 and October 2021 with definite or probable MD. A custom-designed, comprehensive questionnaire was used to identify patients' migraine-related symptoms. The clinical and audiometric data were used to diagnose patients with definite or probable MD using criteria set by the American Academy of Otolaryngology-Head and Neck Surgery. RESULTS In total, 113 patients with definite or probable MD were included in the study. The mean age of the patients was 60 ± 15 years with no gender predominance (49.6% male and 50.4% female). A total of 57 (50%) patients were presented with headaches. Among the migraine headache cohort, headache and otalgia were on the same side as the MD ear affected by hearing loss. In addition, in patients who present with otalgia as the primary feature of headache, otalgia was more likely to be on the same side as the ear affected by the hearing loss. CONCLUSIONS The high prevalence of migraine symptoms on the same side of the ear affected by MD among this cohort could suggest a shared pathophysiology in both MD and migraine, possibly involving migraine-related changes in both the cochlea and vestibule.
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Affiliation(s)
- Karen Tawk
- Department of Otolaryngology–Head and Neck Surgery, University of California, Irvine, USA
| | - Joshua K. Kim
- Department of Otolaryngology–Head and Neck Surgery, University of California, Irvine, USA
| | - Madelyn Frank
- Department of Otolaryngology–Head and Neck Surgery, University of California, Irvine, USA
| | - Khodayar Goshtasbi
- Department of Otolaryngology–Head and Neck Surgery, University of California, Irvine, USA
| | - Mehdi Abouzari
- Department of Otolaryngology–Head and Neck Surgery, University of California, Irvine, USA
| | - Hamid R. Djalilian
- Department of Otolaryngology–Head and Neck Surgery, University of California, Irvine, USA
- Department of Biomedical Engineering, University of California, Irvine, USA
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Umemoto KK, Tawk K, Mazhari N, Abouzari M, Djalilian HR. Management of Migraine-Associated Vestibulocochlear Disorders. Audiol Res 2023; 13:528-545. [PMID: 37489383 PMCID: PMC10366928 DOI: 10.3390/audiolres13040047] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 06/03/2023] [Accepted: 07/12/2023] [Indexed: 07/26/2023] Open
Abstract
Migraine is a chronic neurological disorder that frequently coexists with different vestibular and cochlear symptoms (sudden hearing loss, tinnitus, otalgia, aural fullness, hyperacusis, dizziness, imbalance, and vertigo) and disorders (recurrent benign positional vertigo, persistent postural perceptual dizziness, mal de debarquement, and Menière's disease). Despite evidence of an epidemiological association and similar pathophysiology between migraine and these vestibulocochlear disorders, patients suffering from migraine-related symptoms are usually underdiagnosed and undertreated. Current migraine treatment options have shown success in treating vestibulocochlear symptoms. Lifestyle and dietary modifications (reducing stress, restful sleep, avoiding migraine dietary triggers, and avoiding starvation and dehydration) and supplements (vitamin B2 and magnesium) offer effective first-line treatments. Treatment with migraine prophylactic medications such as tricyclic antidepressants (e.g., nortriptyline), anticonvulsants (e.g., topiramate), and calcium channel blockers (e.g., verapamil) is implemented when lifestyle and dietary modifications are not sufficient in improving a patient's symptoms. We have included an algorithm that outlines a suggested approach for addressing these symptoms, taking into account our clinical observations. Greater recognition and understanding of migraine and its related vestibular and cochlear symptoms are needed to ensure the appropriate diagnosis and treatment of affected patients.
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Affiliation(s)
- Kayla K Umemoto
- College of Medicine, California Northstate University, Elk Grove, CA 95757, USA
| | - Karen Tawk
- Division of Neurotology and Skull Base Surgery, Department of Otolaryngology-Head and Neck Surgery, University of California, Irvine, CA 92697, USA
| | - Najva Mazhari
- Division of Neurotology and Skull Base Surgery, Department of Otolaryngology-Head and Neck Surgery, University of California, Irvine, CA 92697, USA
| | - Mehdi Abouzari
- Division of Neurotology and Skull Base Surgery, Department of Otolaryngology-Head and Neck Surgery, University of California, Irvine, CA 92697, USA
| | - Hamid R Djalilian
- Division of Neurotology and Skull Base Surgery, Department of Otolaryngology-Head and Neck Surgery, University of California, Irvine, CA 92697, USA
- Department of Biomedical Engineering, University of California, Irvine, CA 92617, USA
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3
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Oh SY, Dieterich M, Lee BN, Boegle R, Kang JJ, Lee NR, Gerb J, Hwang SB, Kirsch V. Endolymphatic Hydrops in Patients With Vestibular Migraine and Concurrent Meniere's Disease. Front Neurol 2021; 12:594481. [PMID: 33776877 PMCID: PMC7991602 DOI: 10.3389/fneur.2021.594481] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Accepted: 02/09/2021] [Indexed: 12/17/2022] Open
Abstract
Objective: Intravenous contrast agent enhanced, high-resolution magnetic resonance imaging of the inner ear (iMRI) confirmed that patients with Menière's disease (MD) and vestibular migraine (VM) could present with endolymphatic hydrops (EH). The present study aimed to investigate EH characteristics and their interrelation to neurotologic testing in patients with VM, MD, or VM with concurrent MD (VM-MD). Methods: Sixty–two patients (45 females, aged 23–81 years) with definite or probable VM (n = 25, 19 definite), MD (n = 29, 17 definite), or showing characteristics of both diseases (n = 8) were included in this study. Diagnostic workup included neurotologic assessments including video-oculography (VOG) during caloric stimulation and head-impulse test (HIT), ocular and cervical vestibular evoked myogenic potentials (o/cVEMP), pure tone audiometry (PTA), as well as iMRI. EH's degree was assessed visually and via volumetric quantification using a probabilistic atlas-based segmentation of the bony labyrinth and volumetric local thresholding (VOLT). Results: Although a relevant number of VM patients reported varying auditory symptoms (13 of 25, 52.0%), EH in VM was only observed twice. In contrast, EH in VM-MD was prevalent (2/8, 25%) and in MD frequent [23/29, 79.3%; χ2(2) = 29.1, p < 0.001, φ = 0.7]. Location and laterality of EH and neurophysiological testing classifications were highly associated (Fisher exact test, p < 0.005). In MD, visual semi-quantitative grading and volumetric quantification correlated highly to each other (rS = 0.8, p < 0.005, two-sided) and to side differences in VOG during caloric irrigation (vestibular EH ipsilateral: rS = 0.6, p < 0.05, two-sided). In VM, correlations were less pronounced. VM-MD assumed an intermediate position between VM and MD. Conclusion: Cochlear and vestibular hydrops can occur in MD and VM patients with auditory symptoms; this suggests inner ear damage irrespective of the diagnosis of MD or VM. The EH grades often correlated with auditory symptoms such as hearing impairment and tinnitus. Further research is required to uncover whether migraine is one causative factor of EH or whether EH in VM patients with auditory symptoms suggests an additional pathology due to MD.
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Affiliation(s)
- Sun-Young Oh
- Department of Neurology, School of Medicine, Jeonbuk National University, Jeonju, South Korea.,Research Institute of Clinical Medicine, Jeonbuk National University Hospital-Biomedical Research Institute, Jeonbuk National University, Jeonju, South Korea
| | - Marianne Dieterich
- Department of Neurology, University Hospital, Ludwig-Maximilians-Universität, Munich, Germany.,German Center for Vertigo and Balance Disorders-IFB, University Hospital, Ludwig-Maximilians-Universität, Munich, Germany.,Munich Cluster for Systems Neurology (SyNergy), Munich, Germany
| | - Bit Na Lee
- Department of Neurology, School of Medicine, Jeonbuk National University, Jeonju, South Korea
| | - Rainer Boegle
- Department of Neurology, University Hospital, Ludwig-Maximilians-Universität, Munich, Germany.,German Center for Vertigo and Balance Disorders-IFB, University Hospital, Ludwig-Maximilians-Universität, Munich, Germany
| | - Jin-Ju Kang
- Department of Neurology, School of Medicine, Jeonbuk National University, Jeonju, South Korea
| | - Na-Ri Lee
- Research Institute of Clinical Medicine, Jeonbuk National University Hospital-Biomedical Research Institute, Jeonbuk National University, Jeonju, South Korea.,Division of Oncology and Hematology, Department of Internal Medicine, Jeonbuk National University Hospital and School of Medicine, Jeonju, South Korea
| | - Johannes Gerb
- Department of Neurology, University Hospital, Ludwig-Maximilians-Universität, Munich, Germany.,German Center for Vertigo and Balance Disorders-IFB, University Hospital, Ludwig-Maximilians-Universität, Munich, Germany
| | - Seung-Bae Hwang
- Research Institute of Clinical Medicine, Jeonbuk National University Hospital-Biomedical Research Institute, Jeonbuk National University, Jeonju, South Korea.,Department of Radiology, Jeonbuk National University Hospital and School of Medicine, Jeonju, South Korea
| | - Valerie Kirsch
- Department of Neurology, University Hospital, Ludwig-Maximilians-Universität, Munich, Germany.,German Center for Vertigo and Balance Disorders-IFB, University Hospital, Ludwig-Maximilians-Universität, Munich, Germany
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Kutlubaev MA, Zamergrad MV. [A role of vascular risk factors in the development of peripheral vestibulopathy]. Zh Nevrol Psikhiatr Im S S Korsakova 2019; 119:85-89. [PMID: 31825395 DOI: 10.17116/jnevro201911909285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The development of peripheral vestibular disorders are often thought to be associated with vascular mechanisms, taking into account terminal type of inner ear blood supply and other predisposing factors. A number of studies indicates a high frequency of vascular risk factors in the patients with vestibular neuronitis and benign paroxysmal positional vertigo (BPPV). According to other results, migraine is widely spread among patients with Meniere's disease and BPPV. However currently there is no evidence for casual relationship between vascular factors and development of peripheral vestibulopathy. The only exclusion is labyrinthine infarction, which develops as a result of posterior circulation disorder. More research is needed in this area.
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Affiliation(s)
- M A Kutlubaev
- Kuvatov Republican Clinical Hospital, Ufa, Russia; Bashkir State Medical University, Ufa, Russia
| | - M V Zamergrad
- Russian Medical Aacademy for Contuning Postgraduate Education, Moscow, Russia
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5
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Sarna B, Abouzari M, Lin HW, Djalilian HR. A hypothetical proposal for association between migraine and Meniere's disease. Med Hypotheses 2019; 134:109430. [PMID: 31629154 DOI: 10.1016/j.mehy.2019.109430] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Revised: 10/01/2019] [Accepted: 10/10/2019] [Indexed: 12/15/2022]
Abstract
Meniere's disease (MD) is a chronic condition affecting the inner ear whose precise etiology is currently unknown. We propose the hypothesis that MD is a migraine-related phenomenon which may have implications for future treatment options for both diseases. The association between MD and migraine is both an epidemiological and a mechanistic one, with up to 51% of individuals with MD experiencing migraine compared to 12% in the general population. The presence of endolymphatic hydrops in those with MD may be the factor that unites the two conditions, as hydropic inner ears have an impaired ability to maintain homeostasis. Migraine headaches are theorized to cause aura and symptoms via spreading cortical depression that ultimately results in substance P release, alterations in blood flow, and neurogenic inflammation. Chronically hydropic inner ears are less able to auto-regulate against the changes induced by active migraine attacks and may ultimately manifest as MD. This same vulnerability to derangements in homeostasis may also explain the common triggering factors of both MD attacks and migraine headaches, including stress, weather, and diet. Similarly, it may explain the efficacy of common treatments for both diseases: current migraine treatments such as anti-hypertensives and anti-convulsants have shown promise in managing MD. Though the etiology of both MD and migraine is likely multifactorial, further exploration of the association between the two conditions may illuminate how to best manage them in the future. MD is likely a manifestation of cochleovestibular migraine, which occurs as a result of migraine related changes in both the cochlea and vestibule.
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Affiliation(s)
- Brooke Sarna
- Department of Otolaryngology-Head and Neck Surgery, University of California, Irvine, USA
| | - Mehdi Abouzari
- Department of Otolaryngology-Head and Neck Surgery, University of California, Irvine, USA; Division of Pediatric Otolaryngology, Children's Hospital of Orange County, Orange, USA
| | - Harrison W Lin
- Department of Otolaryngology-Head and Neck Surgery, University of California, Irvine, USA
| | - Hamid R Djalilian
- Department of Otolaryngology-Head and Neck Surgery, University of California, Irvine, USA; Department of Biomedical Engineering, University of California, Irvine, USA.
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6
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Kutlubaev MA, Pal'chun VT, Savel'eva EE, Guseva AL. [Vascular mechanisms in Meniere's disease]. Vestn Otorinolaringol 2019; 84:70-77. [PMID: 31198220 DOI: 10.17116/otorino20198402170] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Meniere's disease (MD) is chronic multifactorial medical condition caused by endolymphatic hydrops, which etiology is unclear. This review highlights possible vascular mechanisms of MD. Impairment of vascular regulation, further ischemic damage of labyrinth and venous drainage pathology could lead to endolymphatic hydrops. Epidemiologic studies reveal high comorbidity of MD and migraine. Both diseases could be the result of trigeminovascular dysfunction. Betahistine, the medication with vascular effect, is widely used in treatment of MD, the effectiveness of calcium channel blockers is evaluated. Keywords: vertigo, Meniere's disease, endolymphatichydrops, migraine, vascular mechanisms, betahistine.
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Affiliation(s)
- M A Kutlubaev
- Kuvatov Republican Clinical Hospital, Ufa, Russia, 450005,Bashkir State Medical University of the Ministry of Health of Russia, Ufa, Russia, 450000
| | - V T Pal'chun
- N.I. Pirogov Russian National Research Medical University of the Ministry of Health of Russia, Moscow, Russia, 117997,Sverzhevsky Research Institute of Clinical Otorhinolaryngology, Moscow, Russia, 117152
| | - E E Savel'eva
- Bashkir State Medical University of the Ministry of Health of Russia, Ufa, Russia, 450000
| | - A L Guseva
- N.I. Pirogov Russian National Research Medical University of the Ministry of Health of Russia, Moscow, Russia, 117997
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7
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Oberman BS, Patel VA, Cureoglu S, Isildak H. The aetiopathologies of Ménière's disease: a contemporary review. ACTA OTORHINOLARYNGOLOGICA ITALICA 2018; 37:250-263. [PMID: 28244505 PMCID: PMC5584095 DOI: 10.14639/0392-100x-793] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Accepted: 03/26/2016] [Indexed: 11/23/2022]
Abstract
Ménière's disease, a condition first described in the 1800's, has been an advancing area of clinical interest and scientific research in recent decades. Guidelines published by the American Academy of Otolaryngology - Head and Neck Surgery remained nearly static for almost 20 years, although we have certainly expanded our knowledge of the aetiology of the disease since that time. This review of the literature highlights the breadth and detail of the current theories in understanding the pathophysiology of this enigmatic disease. Histopathological specimens providing evidence of many of the aetiologies are presented as well. We aim to provide a centralised and updated resource regarding current and emerging theories for Ménière's disease.
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Affiliation(s)
- B S Oberman
- Department of Surgery, Division of Otolaryngology, Head and Neck Surgery, The Pennsylvania State University, College of Medicine, Hershey, PA, USA
| | - V A Patel
- Department of Surgery, Division of Otolaryngology, Head and Neck Surgery, The Pennsylvania State University, College of Medicine, Hershey, PA, USA
| | - S Cureoglu
- Department of Otolaryngology, Paparella Otopathology Laboratory, University of Minnesota, Minneapolis, MN, USA
| | - H Isildak
- Department of Surgery, Division of Otolaryngology, Head and Neck Surgery, The Pennsylvania State University, College of Medicine, Hershey, PA, USA
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8
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Cureoglu S, da Costa Monsanto R, Paparella MM. Histopathology of Meniere's disease. ACTA ACUST UNITED AC 2016; 27:194-204. [PMID: 28286401 DOI: 10.1016/j.otot.2016.10.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Sebahattin Cureoglu
- Department of Otolaryngology-Head and Neck Surgery, University of Minnesota, Minneapolis, Minnesota, USA
| | - Rafael da Costa Monsanto
- Department of Otolaryngology-Head and Neck Surgery, University of Minnesota, Minneapolis, Minnesota, USA; Department of Otolaryngology and Head and Neck Surgery, Banco de Olhos de Sorocaba Hospital, Sorocaba, Brazil
| | - Michael M Paparella
- Department of Otolaryngology-Head and Neck Surgery, University of Minnesota, Minneapolis, Minnesota, USA; Paparella Ear Head and Neck Institute, Minneapolis, Minnesota, USA
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9
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Abstract
Normal blood supply to the cochlea is critically important for establishing the endocochlear potential and sustaining production of endolymph. Abnormal cochlear microcirculation has long been considered an etiologic factor in noise-induced hearing loss, age-related hearing loss (presbycusis), sudden hearing loss or vestibular function, and Meniere's disease. Knowledge of the mechanisms underlying the pathophysiology of cochlear microcirculation is of fundamental clinical importance. A better understanding of cochlear blood flow (CoBF) will enable more effective management of hearing disorders resulting from aberrant blood flow. This review focuses on recent discoveries and findings related to the physiopathology of the cochlear microvasculature.
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Affiliation(s)
- Xiaorui Shi
- Oregon Hearing Research Center (NRC04), Department of Otolaryngology/Head & Neck Surgery, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239, USA.
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10
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Tollin DJ, Koka K. Postnatal development of sound pressure transformations by the head and pinnae of the cat: monaural characteristics. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2009; 125:980-994. [PMID: 19206874 PMCID: PMC2736725 DOI: 10.1121/1.3058630] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2008] [Revised: 12/04/2008] [Accepted: 12/05/2008] [Indexed: 05/27/2023]
Abstract
Although there have been many anatomical, physiological, and psychophysical studies of auditory development in cat, there have been no comparable studies of the development of the sound pressured transformations by the cat head and pinnae. Because the physical dimensions of the head and pinnae determine the spectral and temporal transformations of sound, as head and pinnae size increase during development, the magnitude and frequency ranges of these transformations are hypothesized to systematically change. This hypothesis was tested by measuring directional transfer functions (DTFs), the directional components of head-related transfer functions, and the linear dimensions of the head and pinnae in cats from the onset of hearing ( approximately 1.5 weeks) through adulthood. Head and pinnae dimensions increased by factors of approximately 2 and approximately 2.5, respectively, reaching adult values by approximately 23 and approximately 16 weeks, respectively. The development of the spectral notch cues to source location, the spatial- and frequency-dependent distributions of DTF amplitude gain (acoustic directionality), maximum gain, and the acoustic axis, and the resonance frequency and associated gain of the ear canal and concha were systematically related to the dimensions of the head and pinnae. These monaural acoustical properties of the head and pinnae in the cat are mature by 16 weeks.
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Affiliation(s)
- Daniel J Tollin
- Department of Physiology and Biophysics, University of Colorado Health Sciences Center, Aurora, Colorado 80045, USA.
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Shi X, Han W, Yamamoto H, Tang W, Lin X, Xiu R, Trune DR, Nuttall AL. The cochlear pericytes. Microcirculation 2008; 15:515-29. [PMID: 19086261 DOI: 10.1080/10739680802047445] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
OBJECTIVES Cochlear pericytes are not well characterized. The aim of this study was to further advance the characterization of cochlear pericyte location and distribution, with particular focus on pericyte-related proteins on the capillaries of the cochlear lateral wall that are functionally integral to structure, contraction, and gap junction transport. MATERIALS AND METHODS Cochlear pericytes were identified by the immunofluorescence labeling of pericyte marker proteins, including alpha-smooth muscle actin (alpha-SMA), desmin, Thy-1, tropomyosin, and NG2, and by morphological identification, using fluorescence, electron, and differential interference contrast microscopy. RESULTS Pericytes were predominately found in the capillary network of the cochlear lateral wall, with considerable morphological heterogeneity across different types of microvessels. For example, pericytes on the vessels of the spiral ligament (V/SL) strongly expressed a gap junction protein, connexin 40, and were positive for alpha-SMA, tropomyosin, and desmin. In contrast, pericytes on the vessels of the stria vascularis (V/SV) were positive for desmin, and were negative for alpha-SMA and tropomyosin. CONCLUSIONS The capillary networks of the cochlear lateral wall comprise a rich population of pericytes. These pericytes are morphologically heterogeneous, with protein expression potentially indicative of function.
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Affiliation(s)
- Xiaorui Shi
- Oregon Hearing Research Center (NRC04), Oregon Health & Science University, Portland, Oregon 97239-3098, USA.
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12
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Akagi N, Takumida M, Anniko M. Effect of inner ear blood flow changes on the endolymphatic sac. Acta Otolaryngol 2008; 128:1187-95. [PMID: 18607967 DOI: 10.1080/00016480801910387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
CONCLUSIONS That the endolymphatic sac (ES) reacts to changes in inner ear blood flow may be important for homeostasis of the inner ear fluid volume and pressure. OBJECTIVES To elucidate the effect of changes in inner ear blood flow on the ES and to learn more about the volume and pressure regulatory function of the ES. MATERIALS AND METHODS Epinephrine or sodium nitroprusside (SNP) was injected into the middle ear cavity of adult CBA/J mice. The ES were analyzed morphologically by light microscopy. RESULTS Epinephrine reduced the luminal size of the ES leading to an accumulation of intraluminal homogeneous substance. Injection of SNP increased the size of the ES lumen, accompanied by a collapse of the lateral intercellular space (LIS) and dense perisaccular tissue. These changes were almost reversed 4 h after injection.
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Affiliation(s)
- Nana Akagi
- Hiroshima University School of Medicine, Hiroshima, Japan
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13
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Koka K, Read HL, Tollin DJ. The acoustical cues to sound location in the rat: measurements of directional transfer functions. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2008; 123:4297-309. [PMID: 18537381 PMCID: PMC2579256 DOI: 10.1121/1.2916587] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The acoustical cues for sound location are generated by spatial- and frequency-dependent filtering of propagating sound waves by the head and external ears. Although rats have been a common model system for anatomy, physiology, and psychophysics of localization, there have been few studies of the acoustical cues available to rats. Here, directional transfer functions (DTFs), the directional components of the head-related transfer functions, were measured in six adult rats. The cues to location were computed from the DTFs. In the frontal hemisphere, spectral notches were present for frequencies from approximately 16 to 30 kHz; in general, the frequency corresponding to the notch increased with increases in source elevation and in azimuth toward the ipsilateral ear. The maximum high-frequency envelope-based interaural time differences (ITDs) were 130 mus, whereas low-frequency (<3.5 kHz) fine-structure ITDs were 160 mus; both types of ITDs were larger than predicted from spherical head models. Interaural level differences (ILDs) strongly depended on location and frequency. Maximum ILDs were <10 dB for frequencies <8 kHz and were as large as 20-40 dB for frequencies >20 kHz. Removal of the pinna eliminated the spectral notches, reduced the acoustic gain and ILDs, altered the acoustical axis, and reduced the ITDs.
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Affiliation(s)
- Kanthaiah Koka
- Department of Physiology and Biophysics, University of Colorado Health Sciences Center, Stop 8307, P.O. Box 6511, Aurora, Colorado 80045, USA
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Maki K, Furukawa S. Acoustical cues for sound localization by the Mongolian gerbil, Meriones unguiculatus. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2005; 118:872-86. [PMID: 16158644 DOI: 10.1121/1.1944647] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The present study measured the head-related transfer functions (HRTFs) of the Mongolian gerbil for various sound-source directions, and explored acoustical cues for sound localization that could be available to the animals. The HRTF exhibited spectral notches for frequencies above 25 kHz. The notch frequency varied systematically with source direction, and thereby characterized the source directions well. The frequency dependence of the acoustical axis, the direction for which the HRTF amplitude was maximal, was relatively irregular and inconsistent between ears and animals. The frequency-by-frequency plot of the interaural level difference (ILD) exhibited positive and negative peaks, with maximum values of 30 dB at around 30 kHz. The ILD peak frequency had a relatively irregular spatial distribution, implying a poor sound localization cue. The binaural acoustical axis (the direction with the maximum ILD magnitude) showed relatively orderly clustering around certain frequencies, the pattern being fairly consistent among animals. The interaural time differences (ITDs) were also measured and fell in a +/- 120 micros range. When two different animal postures were compared (i.e., the animal was standing on its hind legs and prone), small but consistent differences were found for the lower rear directions on the HRTF amplitudes, the ILDs, and the ITDs.
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Affiliation(s)
- Katuhiro Maki
- Human and Information Science Laboratory, NTT Communication Science Laboratories, NTT Corporation, 3-1, Morinosato-Wakamiya, Atsugi, Kanagawa 243-0198, Japan.
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15
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Nakashima T, Naganawa S, Sone M, Tominaga M, Hayashi H, Yamamoto H, Liu X, Nuttall AL. Disorders of cochlear blood flow. ACTA ACUST UNITED AC 2004; 43:17-28. [PMID: 14499459 DOI: 10.1016/s0165-0173(03)00189-9] [Citation(s) in RCA: 165] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The cochlea is principally supplied from the inner ear artery (labyrinthine artery), which is usually a branch of the anterior inferior cerebellar artery. Cochlear blood flow is a function of cochlear perfusion pressure, which is calculated as the difference between mean arterial blood pressure and inner ear fluid pressure. Many otologic disorders such as noise-induced hearing loss, endolymphatic hydrops and presbycusis are suspected of being related to alterations in cochlear blood flow. However, the human cochlea is not easily accessible for investigation because this delicate sensory organ is hidden deep in the temporal bone. In patients with sensorineural hearing loss, magnetic resonance imaging, laser-Doppler flowmetry and ultrasonography have been used to investigate the status of cochlear blood flow. There have been many reports of hearing loss that were considered to be caused by blood flow disturbance in the cochlea. However, direct evidence of blood flow disturbance in the cochlea is still lacking in most of the cases.
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Affiliation(s)
- Tsutomu Nakashima
- Department of Otorhinolaryngology, Nagoya University School of Medicine, Nagoya, Japan.
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Hoshijima H, Makimoto K, Noi O, Ohinata Y, Takenaka H. Effects of nitric oxide synthase inhibitor on cochlear blood flow. Hear Res 2002; 171:32-42. [PMID: 12204347 DOI: 10.1016/s0378-5955(02)00328-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
We observed in rats the changes in cochlear blood flow (CoBF) and cutaneous blood flow of the abdominal wall (AbBF) after the administration of the NO synthase inhibitor, N-nitro-L-arginine-methyl ester (L-NAME). Ten minutes after i.v. infusion of L-NAME (0.2, 1, 5, 10 mg/kg), L-arginine, which is a substrate of NO, was infused (100 mg/kg) i.v. Employing a laser Doppler flowmeter, the changes in blood flow were recorded from the basal turn of the right cochlea or the abdominal wall and blood pressure (BP) was recorded from the left femoral artery simultaneously. Vascular conductance (VC) was calculated from CoBF/mean BP (cochlear VC) or AbBF/mean BP (abdominal VC). The findings in rats generally agreed with those in guinea pigs [Brechtelsbauer et al., Hear. Res. 77 (1994) 38-42]. Intravenous infusion of L-NAME produced a dose-dependent depression of cochlear VC at 0.2 mg/kg (-18.9), 1 mg/kg (-37.9%), 5 mg/kg (-45.8%) and 10 mg/kg (-48.3%). AbBF also decreased after infusion of L-NAME (5 mg/kg) but to a lesser degree (-41.1% in VC) with no significance compared to CoBF (5 mg/kg). Infusion of L-arginine partially reversed the CoBF decrease caused by L-NAME. The group of 0.2 mg/kg infusion of L-NAME showed the largest degree of recovery with L-arginine, while the 10 mg/kg group showed the smallest. The decrease in AbBF did not recover substantially with L-arginine, the degree being less than that of each group in the CoBF experiment. It was suggested that the NO/soluble guanylate cyclase/cGMP system is more active in the cochlear microcirculation. With the round window (RW) application of 1% L-NAME (2 microl), cochlear VC was decreased by 21.6%, which was closest to that of the 0.2 mg/kg group of L-NAME i.v. infusion. The cochlear VC depression after local application of L-NAME did not show any recovery (-0.3%) by RW application of 5% L-arginine (2 microl) 25 min after L-NAME application; a slight gradual increase was observed when a higher concentration (20%) of L-arginine was applied to the RW. We propose that i.v. infusions of L-NAME and L-arginine primarily affect the precapillary arteriole of the spiral modiolar artery which effectively regulates microcirculation as a resistance vessel, and that RW application affects the vessels of the lateral wall, not the spiral modiolar artery because of the difficulty of substance diffusion.
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Affiliation(s)
- Hideaki Hoshijima
- Department of Otolaryngology, Osaka Medical College, 2-7 Daigakumachi, Takatsuki, Osaka 569-8686, Japan
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Reddy PG, Burgio DL, Quirk WS. Measurement of peripheral vestibular blood flow in a gerbil model of endolymphatic hydrops. Otolaryngol Head Neck Surg 2000; 123:97-100. [PMID: 10889489 DOI: 10.1067/mhn.2000.106192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Presently, many investigators believe that the dysfunction of microcirculatory mechanisms may be responsible for vestibular symptoms in Meniere's disease. This study, using intravital microscopy (IVM), a technique that provides in vivo microcirculatory measures, was designed to determine whether impaired vestibular blood flow exists in endolymphatic hydrops. Hydrops was induced in the gerbil model by obliteration of the vestibular aqueduct and was confirmed histologically after IVM. Posthydrops gerbil subjects at 8 weeks as well as control animals were prepared for IVM. With a customized intravital microscope, red blood cell velocity and vessel diameter measurements were calculated for individual arterioles and capillaries from the microvascular bed at the horizontal ampulla. Mean arteriole diameter was significantly larger in the control group than in the hydrops group, whereas mean capillary diameters were similar for both groups. No significant difference was observed for mean red blood cell velocity in capillaries or arterioles between control and hydrops animals.
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Affiliation(s)
- P G Reddy
- Department of Otolaryngology-Head and Neck Surgery, Wayne State University School of Medicine, Detroit, MI 48201, USA
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18
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Michel O, Hess A, Su J, Bloch W, Stennert E, Addicks K. Expression of inducible nitric oxide synthase (iNOS/NOS II) in the hydropic cochlea of guinea pigs. Hear Res 2000; 143:23-8. [PMID: 10771181 DOI: 10.1016/s0378-5955(00)00018-6] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Immunohistochemical investigations of the guinea pig cochlea, using a specific antibody to the inducible isoform of NO synthase (iNOS/NOS II), have been performed 3 weeks after closure of the right endolymphatic duct (n=7). Endolymphatic hydrops, the morphological substrate of Meniere's disease, became evident by distension of the Reissner's membrane. iNOS expression could be noted in endothelium, spiral ganglion cells, in nerve fibers, in supporting cells of the organ of Corti and cells of the spiral ligament. Temporal bones of non-operated controls (n=6) as well as of sham-operated animals (n=3) did not show structures positive to iNOS. These findings imply that iNOS-generated NO could be involved in the pathophysiology of cochlear dysfunction in Meniere's disease.
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Affiliation(s)
- O Michel
- Department of Oto-Rhino-Laryngology, University of Cologne, Joseph-Stelzmann-Str. 9, 50924, Cologne, Germany.
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19
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Morris JC, Phelps PE, Simmons DD. NADPH-diaphorase histochemistry reveals an autonomic-like innervation in the postnatal hamster cochlea. J Comp Neurol 1999; 412:458-68. [PMID: 10441233 DOI: 10.1002/(sici)1096-9861(19990927)412:3<458::aid-cne6>3.0.co;2-f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Previous studies used nicotinamide adenine diphosphate (NADPH)-diaphorase histochemistry as an indicator of nitric oxide synthase (NOS) expression in the adult mammalian cochlea. In this study, we investigated the early postnatal expression of diaphorase activity in the hamster cochlea. Two types of extrinsic fibers were intensely labeled as early as postnatal day 3 (P3) in the portion of the cochlear nerve that innervates the base of the modiolus. By P10, these fibers had reached the spiral ganglion and were projecting toward the organ of Corti. The perivascular type of fiber did not project into the organ of Corti; however, the nonperivascular type could be traced among the supporting cells below the outer hair cells. Spiral ganglion cell somata were also labeled as early as P3. The onset of diaphorase expression in the spiral ganglion cells corresponds to a critical period of synaptogenesis for these sensorineural cells. If NADPH-diaphorase activity is an indicator of NOS, then our results suggest that NO may play a role during postnatal cochlear development.
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Affiliation(s)
- J C Morris
- Department of Physiological Science, University of California, Los Angeles, Los Angeles, California 90095, USA
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20
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Suzuki T, Ren T, Nuttall AL, Miller JM. Age-related changes in cochlear blood flow response to occlusion of anterior inferior cerebellar artery in mice. Ann Otol Rhinol Laryngol 1998; 107:648-53. [PMID: 9716864 DOI: 10.1177/000348949810700803] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Previous studies suggest that autoregulation of cochlear blood flow (CBF) may be impaired by aging. In this study, we quantified the capacity of CBF autoregulation in young adult (6-month-old) and aged (21-month-old) CBA mice, to examine the effect of aging on CBF autoregulation. The technique of anterior inferior cerebellar artery (AICA) occlusion was employed to manipulate cochlear perfusion pressure. The CBF was measured by laser Doppler flowmetry during intermittent occlusion of the AICA with a microvascular clamp, which causes an initial decrease in CBF. The autoregulation of CBF was evaluated by quantifying the CBF increase (compensatory dilatory response in the cochlear vessels) during AICA occlusion. Our results demonstrated that autoregulation of CBF was significantly reduced and that collateral vascular function supplying CBF was significantly lower in the aged group. These findings suggest that the aged ear has less capacity to maintain stable blood flow and thus may be more vulnerable to stress factors that affect cochlear function.
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Affiliation(s)
- T Suzuki
- Kresge Hearing Research Institute, University of Michigan Medical School, Ann Arbor, USA
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21
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Trautwein PG, Hashino E, Salvi RJ. Regenerated hair cells become functional during continuous administration of kanamycin. Audiol Neurootol 1998; 3:229-39. [PMID: 9644535 DOI: 10.1159/000013795] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The compound action potential (CAP) was used to assess the functional status of regenerated hair cells in the chick cochlea during prolonged administration of kanamycin (KM). Immediately after 10 days of KM treatment, the CAP thresholds were elevated by 6-54 dB above those from age-matched control animals. The frequencies with the greatest threshold shifts (> 1 kHz) corresponded to the hair cell lesion in the basal 40% of the basilar papilla. After 20 days of KM, the CAP thresholds at 3 and 4 kHz were significantly lower than those after 10 days of KM treatment, but virtually the same as those after 10 days of KM plus 10 days of recovery. Similarly, the CAP amplitudes at frequencies higher than 1.5 kHz were significantly greater in animals that received KM for 20 days than in animals that received KM for 10 days. The threshold as well as amplitude improvement between 10 days and 20 days of KM treatment was associated with the morphological maturation of the regenerated hair cells in the basal 25% of the cochlea. In addition, the rapid functional recovery seen at high frequencies coincided with the base-to-apex gradient of morphological recovery in the basilar papilla. These results suggest that the process of hair cell maturation is not suppressed by the presence of aminoglycosides in the extracellular environment.
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Affiliation(s)
- P G Trautwein
- Center for Hearing and Deafness, State University of New York at Buffalo 14214, USA
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Vass Z, Shore SE, Nuttall AL, Miller JM. Endolymphatic hydrops reduces retrograde labeling of trigeminal innervation to the cochlea. Exp Neurol 1998; 151:241-8. [PMID: 9628760 DOI: 10.1006/exnr.1998.6813] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This paper reports that endolymphatic hydrops causes a significant reduction of retrogradely labeled cell bodies of the ipsilateral trigeminal ganglion following application of horseradish peroxidase in the cochlea. We previously showed that the trigeminal ganglion is a source of primary sensory innervation to the cochlear blood vessels. The innervation of the cochlea from the trigeminal ganglion may provide the basis of an alternative mechanism for Ménière's syndrome (imbalance, hearing loss, tinnitus, and a sensation of fullness in the ear) for which a central neural basis has been speculated. Innervation patterns of sensory nerves from the trigeminal ganglion to the cochlear blood vessels were studied using retrograde transport of wheat germ agglutinin conjugated to horseradish peroxidase (WGA-HRP). Healthy and hydropic guinea pigs were unilaterally implanted with an osmotic pump and a cannula for cochlear delivery of 2% WGA-HRP or vehicle alone. In other guinea pigs the cochlea was pretreated with 100 micromol capsaicin before administering 2% WGA-HRP. Histological sections of the ipsi- and contralateral trigeminal ganglia were obtained 48 h after WGA-HRP infusion. In the hydropic guinea pig, the number of labeled nerve cell bodies observed in the anteriomedial portion of the trigeminal ganglion at the origin of the ophthalmic nerve was reduced by 70% relative to normal animals. Capsaicin pretreatment nearly eliminated the labeled sensory fibers as expected. These data indicate that the trigeminal innervation to the cochlea could be involved in inner ear homeostatic disturbances, including the hydrops that is symptomatic of Ménière's disease.
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Affiliation(s)
- Z Vass
- Department of Otorhinolaryngology, Albert Szent-Györgyi Medical University, Szeged, H-6725, Hungary
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