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Schoo DP, Ward BK, Chow MR, Ayiotis AI, Fernández Brillet C, Boutros PJ, Lane KE, Lee CN, Morris BJ, Carey JP, Della Santina CC. Vestibular Implant Surgery. Laryngoscope 2024; 134:1842-1846. [PMID: 37767871 DOI: 10.1002/lary.31004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 07/14/2023] [Accepted: 08/16/2023] [Indexed: 09/29/2023]
Affiliation(s)
- Desi P Schoo
- Department of Otolaryngology-Head and Neck Surgery, School of Medicine, Johns Hopkins University, Baltimore, Maryland, U.S.A
| | - Bryan K Ward
- Department of Otolaryngology-Head and Neck Surgery, School of Medicine, Johns Hopkins University, Baltimore, Maryland, U.S.A
| | - Margaret R Chow
- Department of Biomedical Engineering, School of Medicine, Johns Hopkins University, Baltimore, Maryland, U.S.A
- Labyrinth Devices, LLC, Baltimore, Maryland, U.S.A
| | - Andrianna I Ayiotis
- Department of Biomedical Engineering, School of Medicine, Johns Hopkins University, Baltimore, Maryland, U.S.A
| | - Celia Fernández Brillet
- Department of Biomedical Engineering, School of Medicine, Johns Hopkins University, Baltimore, Maryland, U.S.A
| | - Peter J Boutros
- Department of Biomedical Engineering, School of Medicine, Johns Hopkins University, Baltimore, Maryland, U.S.A
| | - Kelly E Lane
- Department of Biomedical Engineering, School of Medicine, Johns Hopkins University, Baltimore, Maryland, U.S.A
| | - Claudia N Lee
- Department of Otolaryngology-Head and Neck Surgery, School of Medicine, Johns Hopkins University, Baltimore, Maryland, U.S.A
| | - Brian J Morris
- Department of Biomedical Engineering, School of Medicine, Johns Hopkins University, Baltimore, Maryland, U.S.A
| | - John P Carey
- Department of Otolaryngology-Head and Neck Surgery, School of Medicine, Johns Hopkins University, Baltimore, Maryland, U.S.A
| | - Charles C Della Santina
- Department of Otolaryngology-Head and Neck Surgery, School of Medicine, Johns Hopkins University, Baltimore, Maryland, U.S.A
- Department of Biomedical Engineering, School of Medicine, Johns Hopkins University, Baltimore, Maryland, U.S.A
- Labyrinth Devices, LLC, Baltimore, Maryland, U.S.A
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Formeister EJ, Krishnan PS, Schoo DP, Andresen N, Sayyid Z, Wei O, Carey JP. Traumatic Events Preceding the Development of Superior Canal Dehiscence Syndrome. Otolaryngol Head Neck Surg 2024. [PMID: 38440913 DOI: 10.1002/ohn.697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2023] [Revised: 01/13/2024] [Accepted: 02/02/2024] [Indexed: 03/06/2024]
Abstract
OBJECTIVE To describe the features of antecedent head trauma in patients with superior canal dehiscence syndrome (SCDS). STUDY DESIGN Cross-sectional survey. SETTING Tertiary referral center. METHODS An online survey was sent to 450 adult patients who underwent surgical repair for SCDS patients asking questions about the nature of internal or external traumatic events preceding symptoms. RESULTS One-hundred and thirty-six patients (avg. age, 51.9 years, 62.8% female) completed the survey, of which 61 (44.9%) described either preceding external head trauma (n = 35, 26%), preceding internal pressure event (n = 33, 25%), or both (8, 6%). Of those endorsing external trauma, 22 (63%) described a singular event (head hit by object (n = 8); head hit ground (n = 5); motor vehicle accident (n = 4); assault (n = 2); other (n = 3). One-third experienced loss of consciousness because of the trauma. For those describing internal pressure events (n = 33), the most common events were heavy physical exertion (9, 27%); pressure changes while flying (6, 18%); coughing, nose blowing with illness (5, 15%); childbirth (5, 15%); and self contained underwater breathing apparatus diving events (3, 9%). The interval between trauma and onset of symptoms averaged 5.6 years (SD, 10.7 years). One-third (n = 19) described onset of symptoms immediately after the external trauma or internal pressure event. Symptoms began on the side ipsilateral to the trauma in 91%. Sound- and pressure-induced vertigo/oscillopsia developed more commonly after external trauma versus internal pressure events (68% and 61% vs 44% and 32%, respectively). CONCLUSION Trauma or internal pressure-related events precede SCDS symptoms in nearly half of cases, with roughly half of preceding events being external.
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Affiliation(s)
- Eric J Formeister
- Department of Head and Neck Surgery and Communication Sciences, Duke University School of Medicine, Durham, North Carolina, USA
- Department of Otolaryngology, Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Pavan S Krishnan
- Department of Otolaryngology, Head and Neck Surgery, University of Miami School of Medicine, Miami, Florida, USA
| | - Desi P Schoo
- Department of Otolaryngology, Head and Neck Surgery, The Ohio State University School of Medicine, Columbus, Ohio, USA
| | - Nicholas Andresen
- Department of Otolaryngology, Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Zahra Sayyid
- Department of Otolaryngology, Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Oren Wei
- Department of Otolaryngology, Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - John P Carey
- Department of Otolaryngology, Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
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Ayiotis AI, Schoo DP, Fernandez Brillet C, Lane KE, Carey JP, Della Santina CC. Patient-Reported Outcomes After Vestibular Implantation for Bilateral Vestibular Hypofunction. JAMA Otolaryngol Head Neck Surg 2024; 150:240-248. [PMID: 38300591 PMCID: PMC10835607 DOI: 10.1001/jamaoto.2023.4475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Accepted: 12/02/2023] [Indexed: 02/02/2024]
Abstract
Importance Standard-of-care treatment proves inadequate for many patients with bilateral vestibular hypofunction (BVH). Vestibular implantation is an emerging alternative. Objective To examine patient-reported outcomes from prosthetic vestibular stimulation. Design, Setting, and Participants The Multichannel Vestibular Implant (MVI) Early Feasibility Study is an ongoing prospective, nonrandomized, single-group, single-center cohort study conducted at Johns Hopkins Hospital that has been active since 2016 in which participants serve as their own controls. The study includes adults with severe or profound adult-onset BVH for at least 1 year and inadequate compensation despite standard-of-care treatment. As of March 2023, 12 candidates completed the eligibility screening process. Intervention The MVI system electrically stimulates semicircular canal branches of the vestibular nerve to convey head rotation. Main Outcomes and Measures Patient-reported outcome instruments assessing dizziness (Dizziness Handicap Inventory [DHI]) and vestibular-related disability (Vestibular Disorders-Activities of Daily Living [VADL]). Health-related quality of life (HRQOL) assessed using the Short Form-36 Utility (SF36U) and Health Utilities Index Mark 3 (HUI3), from which quality-adjusted life-years were computed. Results Ten individuals (5 female [50%]; mean [SD] age, 58.5 [5.0] years; range, 51-66 years) underwent unilateral implantation. A control group of 10 trial applicants (5 female [50%]; mean [SD] age, 55.1 [8.5] years; range, 42-73 years) completed 6-month follow-up surveys after the initial application. After 0.5 years of continuous MVI use, a pooled mean (95% CI) of within-participant changes showed improvements in dizziness (DHI, -36; 95% CI, -55 to -18), vestibular disability (VADL, -1.7; 95% CI, -2.6 to -0.7), and HRQOL by SF36U (0.12; 95% CI, 0.07-0.17) but not HUI3 (0.02; 95% CI, -0.22 to 0.27). Improvements exceeded minimally important differences in the direction of benefit (exceeding 18, 0.65, and 0.03, respectively, for DHI, VADL, and SF36U). The control group reported no mean change in dizziness (DHI, -4; 95% CI, -10 to 2), vestibular disability (VADL, 0.1; 95% CI, -0.9 to 1.1) or HRQOL per SF36U (0; 95% CI, -0.06 to 0.05) but an increase in HRQOL per HUI3 (0.10; 95% CI, 0.04-0.16). Lifetime HRQOL gain for MVI users was estimated to be 1.7 quality-adjusted life-years (95% CI, 0.6-2.8) using SF36U and 1.4 (95% CI, -1.2 to 4.0) using HUI3. Conclusions and Relevance This cohort study found that vestibular implant recipients report vestibular symptom improvements not reported by a control group. These patient-reported benefits support the use of vestibular implantation as a treatment for bilateral vestibular hypofunction.
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Affiliation(s)
- Andrianna I. Ayiotis
- Department of Biomedical Engineering, Johns Hopkins School of Medicine, Baltimore, Maryland
| | - Desi P. Schoo
- Department of Otolaryngology–Head & Neck Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland
- Department of Otolaryngology, The Ohio State University Wexner Medical Center, Columbus
| | | | - Kelly E. Lane
- Department of Otolaryngology–Head & Neck Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland
| | - John P. Carey
- Department of Otolaryngology–Head & Neck Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland
| | - Charles C. Della Santina
- Department of Biomedical Engineering, Johns Hopkins School of Medicine, Baltimore, Maryland
- Department of Otolaryngology–Head & Neck Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland
- Labyrinth Devices, LLC
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Schoo WW, Schoo DP, Chen JX, Carey JP. Underwater Plugging of Superior Canal Dehiscence via the Middle Cranial Fossa is Possible. Otolaryngol Head Neck Surg 2023; 169:1702-1703. [PMID: 37493522 DOI: 10.1002/ohn.425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Accepted: 05/20/2023] [Indexed: 07/27/2023]
Affiliation(s)
- Wesley W Schoo
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, United States
- Department of Otolaryngology-Head and Neck Surgery, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, Iowa, USA
| | - Desi P Schoo
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Jenny X Chen
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - John P Carey
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, United States
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Schoo DP, Ayiotis AI, Brillet CF, Chow MR, Lane KE, Ward BK, Carey JP, Santina CCD. Vestibular Implantation Can Work Even After More Than 20 Years of Bilateral Vestibular Hypofunction. Otol Neurotol 2023; 44:168-171. [PMID: 36624598 PMCID: PMC9851668 DOI: 10.1097/mao.0000000000003768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
OBJECTIVE To determine whether prosthetic stimulation delivered via a vestibular implant can elicit artificial sensation of head movement despite long (23-yr) duration adult-onset ototoxic bilateral vestibular hypofunction (BVH). STUDY DESIGN Case report. SETTING Tertiary care center as part of a first-in-human clinical trial. PATIENTS One. INTERVENTIONS Unilateral vestibular implantation with an investigational multichannel vestibular implant in a 55-year-old man with a well-documented 23-year history of aminoglycoside-induced BVH. MAIN OUTCOME MEASURES Electrically evoked vestibulo-ocular reflexes (eeVOR). RESULTS Vestibular implant stimulation can drive stimulus-aligned eeVOR and elicit a vestibular percept 23 years after the onset of bilateral vestibulopathy. Prosthetic stimulation targeting individual semicircular canals elicited eye movements that approximately aligned with each targeted canal's axis. The magnitude of the eeVOR response increased with increasing stimulus current amplitude. Response alignment and magnitude were similar to those observed for implant recipients who underwent vestibular implantation less than 10 years after BVH onset. Responses were approximately stable for 18 months of continuous device use (24 h/d except during sleep). CONCLUSIONS Vestibular implantation and prosthetic electrical stimulation of semicircular canal afferent nerves can drive canal-specific eye movement responses more than 20 years after the onset of ototoxic vestibular hypofunction.
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Affiliation(s)
- Desi P. Schoo
- Johns Hopkins University School of Medicine, Department of Otolaryngology-Head and Neck Surgery
| | - Andrianna I. Ayiotis
- Johns Hopkins University School of Medicine, Department of Biomedical Engineering
| | | | - Margaret R. Chow
- Johns Hopkins University School of Medicine, Department of Biomedical Engineering
- Labyrinth Devices, LLC, Baltimore, Maryland, USA
| | - Kelly E. Lane
- Johns Hopkins University School of Medicine, Department of Biomedical Engineering
| | - Bryan K. Ward
- Johns Hopkins University School of Medicine, Department of Otolaryngology-Head and Neck Surgery
| | - John P. Carey
- Johns Hopkins University School of Medicine, Department of Otolaryngology-Head and Neck Surgery
| | - Charles C. Della Santina
- Johns Hopkins University School of Medicine, Department of Otolaryngology-Head and Neck Surgery
- Johns Hopkins University School of Medicine, Department of Biomedical Engineering
- Labyrinth Devices, LLC, Baltimore, Maryland, USA
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Schoo DP, Ward BK. New Frontiers in Managing the Dizzy Patient. Otolaryngol Clin North Am 2021; 54:1069-1080. [PMID: 34294438 DOI: 10.1016/j.otc.2021.06.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Despite progress in vestibular research in the last 20 years, much remains poorly understood about vestibular pathophysiology and its management. A shared language is a critical first step in understanding vestibular disorders and is under development. Telehealth will continue for patients with dizziness, and ambulatory monitoring of nystagmus will become a diagnostic tool. In the next 2 decades, it is anticipated that vestibular perceptual threshold testing will become common in tertiary centers, imaging with improved spatial resolution will yield better understanding of vestibular pathophysiology, and that vestibular implants will become a part of clinical practice.
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Affiliation(s)
- Desi P Schoo
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, 601 North Caroline Street, Baltimore, MD 21287, USA
| | - Bryan K Ward
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, 601 North Caroline Street, Baltimore, MD 21287, USA.
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Chow MR, Ayiotis AI, Schoo DP, Gimmon Y, Lane KE, Morris BJ, Rahman MA, Valentin NS, Boutros PJ, Bowditch SP, Ward BK, Sun DQ, Treviño Guajardo C, Schubert MC, Carey JP, Della Santina CC. Posture, Gait, Quality of Life, and Hearing with a Vestibular Implant. N Engl J Med 2021; 384:521-532. [PMID: 33567192 PMCID: PMC8477665 DOI: 10.1056/nejmoa2020457] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
BACKGROUND Bilateral vestibular hypofunction is associated with chronic disequilibrium, postural instability, and unsteady gait owing to failure of vestibular reflexes that stabilize the eyes, head, and body. A vestibular implant may be effective in alleviating symptoms. METHODS Persons who had had ototoxic (7 participants) or idiopathic (1 participant) bilateral vestibular hypofunction for 2 to 23 years underwent unilateral implantation of a prosthesis that electrically stimulates the three semicircular canal branches of the vestibular nerve. Clinical outcomes included the score on the Bruininks-Oseretsky Test of Motor Proficiency balance subtest (range, 0 to 36, with higher scores indicating better balance), time to failure on the modified Romberg test (range, 0 to 30 seconds), score on the Dynamic Gait Index (range, 0 to 24, with higher scores indicating better gait performance), time needed to complete the Timed Up and Go test, gait speed, pure-tone auditory detection thresholds, speech discrimination scores, and quality of life. We compared participants' results at baseline (before implantation) with those at 6 months (8 participants) and at 1 year (6 participants) with the device set in its usual treatment mode (varying stimulus pulse rate and amplitude to represent rotational head motion) and in a placebo mode (holding pulse rate and amplitude constant). RESULTS The median scores at baseline and at 6 months on the Bruininks-Oseretsky test were 17.5 and 21.0, respectively (median within-participant difference, 5.5 points; 95% confidence interval [CI], 0 to 10.0); the median times on the modified Romberg test were 3.6 seconds and 8.3 seconds (difference, 5.1; 95% CI, 1.5 to 27.6); the median scores on the Dynamic Gait Index were 12.5 and 22.5 (difference, 10.5 points; 95% CI, 1.5 to 12.0); the median times on the Timed Up and Go test were 11.0 seconds and 8.7 seconds (difference, 2.3; 95% CI, -1.7 to 5.0); and the median speeds on the gait-speed test were 1.03 m per second and 1.10 m per second (difference, 0.13; 95% CI, -0.25 to 0.30). Placebo-mode testing confirmed that improvements were due to treatment-mode stimulation. Among the 6 participants who were also assessed at 1 year, the median within-participant changes from baseline to 1 year were generally consistent with results at 6 months. Implantation caused ipsilateral hearing loss, with the air-conducted pure-tone average detection threshold at 6 months increasing by 3 to 16 dB in 5 participants and by 74 to 104 dB in 3 participants. Changes in participant-reported disability and quality of life paralleled changes in posture and gait. CONCLUSIONS Six months and 1 year after unilateral implantation of a vestibular prosthesis for bilateral vestibular hypofunction, measures of posture, gait, and quality of life were generally in the direction of improvement from baseline, but hearing was reduced in the ear with the implant in all but 1 participant. (Funded by the National Institutes of Health and others; ClinicalTrials.gov number, NCT02725463.).
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Affiliation(s)
- Margaret R Chow
- From the Departments of Otolaryngology-Head and Neck Surgery (M.R.C., A.I.A., D.P.S., Y.G., K.E.L., B.J.M., P.J.B., S.P.B., B.K.W., D.Q.S., C.T.G., M.C.S., J.P.C., C.C.D.S.) and Biomedical Engineering (M.R.C., A.I.A., B.J.M., P.J.B., C.C.D.S.), Johns Hopkins University School of Medicine, and Labyrinth Devices (M.A.R., N.S.V., C.C.D.S.) - both in Baltimore
| | - Andrianna I Ayiotis
- From the Departments of Otolaryngology-Head and Neck Surgery (M.R.C., A.I.A., D.P.S., Y.G., K.E.L., B.J.M., P.J.B., S.P.B., B.K.W., D.Q.S., C.T.G., M.C.S., J.P.C., C.C.D.S.) and Biomedical Engineering (M.R.C., A.I.A., B.J.M., P.J.B., C.C.D.S.), Johns Hopkins University School of Medicine, and Labyrinth Devices (M.A.R., N.S.V., C.C.D.S.) - both in Baltimore
| | - Desi P Schoo
- From the Departments of Otolaryngology-Head and Neck Surgery (M.R.C., A.I.A., D.P.S., Y.G., K.E.L., B.J.M., P.J.B., S.P.B., B.K.W., D.Q.S., C.T.G., M.C.S., J.P.C., C.C.D.S.) and Biomedical Engineering (M.R.C., A.I.A., B.J.M., P.J.B., C.C.D.S.), Johns Hopkins University School of Medicine, and Labyrinth Devices (M.A.R., N.S.V., C.C.D.S.) - both in Baltimore
| | - Yoav Gimmon
- From the Departments of Otolaryngology-Head and Neck Surgery (M.R.C., A.I.A., D.P.S., Y.G., K.E.L., B.J.M., P.J.B., S.P.B., B.K.W., D.Q.S., C.T.G., M.C.S., J.P.C., C.C.D.S.) and Biomedical Engineering (M.R.C., A.I.A., B.J.M., P.J.B., C.C.D.S.), Johns Hopkins University School of Medicine, and Labyrinth Devices (M.A.R., N.S.V., C.C.D.S.) - both in Baltimore
| | - Kelly E Lane
- From the Departments of Otolaryngology-Head and Neck Surgery (M.R.C., A.I.A., D.P.S., Y.G., K.E.L., B.J.M., P.J.B., S.P.B., B.K.W., D.Q.S., C.T.G., M.C.S., J.P.C., C.C.D.S.) and Biomedical Engineering (M.R.C., A.I.A., B.J.M., P.J.B., C.C.D.S.), Johns Hopkins University School of Medicine, and Labyrinth Devices (M.A.R., N.S.V., C.C.D.S.) - both in Baltimore
| | - Brian J Morris
- From the Departments of Otolaryngology-Head and Neck Surgery (M.R.C., A.I.A., D.P.S., Y.G., K.E.L., B.J.M., P.J.B., S.P.B., B.K.W., D.Q.S., C.T.G., M.C.S., J.P.C., C.C.D.S.) and Biomedical Engineering (M.R.C., A.I.A., B.J.M., P.J.B., C.C.D.S.), Johns Hopkins University School of Medicine, and Labyrinth Devices (M.A.R., N.S.V., C.C.D.S.) - both in Baltimore
| | - Mehdi A Rahman
- From the Departments of Otolaryngology-Head and Neck Surgery (M.R.C., A.I.A., D.P.S., Y.G., K.E.L., B.J.M., P.J.B., S.P.B., B.K.W., D.Q.S., C.T.G., M.C.S., J.P.C., C.C.D.S.) and Biomedical Engineering (M.R.C., A.I.A., B.J.M., P.J.B., C.C.D.S.), Johns Hopkins University School of Medicine, and Labyrinth Devices (M.A.R., N.S.V., C.C.D.S.) - both in Baltimore
| | - Nicolas S Valentin
- From the Departments of Otolaryngology-Head and Neck Surgery (M.R.C., A.I.A., D.P.S., Y.G., K.E.L., B.J.M., P.J.B., S.P.B., B.K.W., D.Q.S., C.T.G., M.C.S., J.P.C., C.C.D.S.) and Biomedical Engineering (M.R.C., A.I.A., B.J.M., P.J.B., C.C.D.S.), Johns Hopkins University School of Medicine, and Labyrinth Devices (M.A.R., N.S.V., C.C.D.S.) - both in Baltimore
| | - Peter J Boutros
- From the Departments of Otolaryngology-Head and Neck Surgery (M.R.C., A.I.A., D.P.S., Y.G., K.E.L., B.J.M., P.J.B., S.P.B., B.K.W., D.Q.S., C.T.G., M.C.S., J.P.C., C.C.D.S.) and Biomedical Engineering (M.R.C., A.I.A., B.J.M., P.J.B., C.C.D.S.), Johns Hopkins University School of Medicine, and Labyrinth Devices (M.A.R., N.S.V., C.C.D.S.) - both in Baltimore
| | - Stephen P Bowditch
- From the Departments of Otolaryngology-Head and Neck Surgery (M.R.C., A.I.A., D.P.S., Y.G., K.E.L., B.J.M., P.J.B., S.P.B., B.K.W., D.Q.S., C.T.G., M.C.S., J.P.C., C.C.D.S.) and Biomedical Engineering (M.R.C., A.I.A., B.J.M., P.J.B., C.C.D.S.), Johns Hopkins University School of Medicine, and Labyrinth Devices (M.A.R., N.S.V., C.C.D.S.) - both in Baltimore
| | - Bryan K Ward
- From the Departments of Otolaryngology-Head and Neck Surgery (M.R.C., A.I.A., D.P.S., Y.G., K.E.L., B.J.M., P.J.B., S.P.B., B.K.W., D.Q.S., C.T.G., M.C.S., J.P.C., C.C.D.S.) and Biomedical Engineering (M.R.C., A.I.A., B.J.M., P.J.B., C.C.D.S.), Johns Hopkins University School of Medicine, and Labyrinth Devices (M.A.R., N.S.V., C.C.D.S.) - both in Baltimore
| | - Daniel Q Sun
- From the Departments of Otolaryngology-Head and Neck Surgery (M.R.C., A.I.A., D.P.S., Y.G., K.E.L., B.J.M., P.J.B., S.P.B., B.K.W., D.Q.S., C.T.G., M.C.S., J.P.C., C.C.D.S.) and Biomedical Engineering (M.R.C., A.I.A., B.J.M., P.J.B., C.C.D.S.), Johns Hopkins University School of Medicine, and Labyrinth Devices (M.A.R., N.S.V., C.C.D.S.) - both in Baltimore
| | - Carolina Treviño Guajardo
- From the Departments of Otolaryngology-Head and Neck Surgery (M.R.C., A.I.A., D.P.S., Y.G., K.E.L., B.J.M., P.J.B., S.P.B., B.K.W., D.Q.S., C.T.G., M.C.S., J.P.C., C.C.D.S.) and Biomedical Engineering (M.R.C., A.I.A., B.J.M., P.J.B., C.C.D.S.), Johns Hopkins University School of Medicine, and Labyrinth Devices (M.A.R., N.S.V., C.C.D.S.) - both in Baltimore
| | - Michael C Schubert
- From the Departments of Otolaryngology-Head and Neck Surgery (M.R.C., A.I.A., D.P.S., Y.G., K.E.L., B.J.M., P.J.B., S.P.B., B.K.W., D.Q.S., C.T.G., M.C.S., J.P.C., C.C.D.S.) and Biomedical Engineering (M.R.C., A.I.A., B.J.M., P.J.B., C.C.D.S.), Johns Hopkins University School of Medicine, and Labyrinth Devices (M.A.R., N.S.V., C.C.D.S.) - both in Baltimore
| | - John P Carey
- From the Departments of Otolaryngology-Head and Neck Surgery (M.R.C., A.I.A., D.P.S., Y.G., K.E.L., B.J.M., P.J.B., S.P.B., B.K.W., D.Q.S., C.T.G., M.C.S., J.P.C., C.C.D.S.) and Biomedical Engineering (M.R.C., A.I.A., B.J.M., P.J.B., C.C.D.S.), Johns Hopkins University School of Medicine, and Labyrinth Devices (M.A.R., N.S.V., C.C.D.S.) - both in Baltimore
| | - Charles C Della Santina
- From the Departments of Otolaryngology-Head and Neck Surgery (M.R.C., A.I.A., D.P.S., Y.G., K.E.L., B.J.M., P.J.B., S.P.B., B.K.W., D.Q.S., C.T.G., M.C.S., J.P.C., C.C.D.S.) and Biomedical Engineering (M.R.C., A.I.A., B.J.M., P.J.B., C.C.D.S.), Johns Hopkins University School of Medicine, and Labyrinth Devices (M.A.R., N.S.V., C.C.D.S.) - both in Baltimore
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8
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Hedjoudje A, Schoo DP, Ward BK, Carey JP, Della Santina CC, Pearl M. Vestibular Implant Imaging. AJNR Am J Neuroradiol 2021; 42:370-376. [PMID: 33361382 PMCID: PMC7872165 DOI: 10.3174/ajnr.a6991] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Accepted: 09/10/2020] [Indexed: 11/07/2022]
Abstract
Analogous to hearing restoration via cochlear implants, vestibular function could be restored via vestibular implants that electrically stimulate vestibular nerve branches to encode head motion. This study presents the technical feasibility and first imaging results of CT for vestibular implants in 8 participants of the first-in-human Multichannel Vestibular Implant Early Feasibility Study. Imaging characteristics of 8 participants (3 men, 5 women; median age, 59.5 years; range, 51-66 years) implanted with a Multichannel Vestibular Implant System who underwent a postimplantation multislice CT (n = 2) or flat panel CT (n = 6) are reported. The device comprises 9 platinum electrodes inserted into the ampullae of the 3 semicircular canals and 1 reference electrode inserted in the common crus. Electrode insertion site, positions, length and angle of insertion, and number of artifacts were assessed. Individual electrode contacts were barely discernible in the 2 participants imaged using multislice CT. Electrode and osseous structures were detectable but blurred so that only 12 of the 18 stimulating electrode contacts could be individually identified. Flat panel CT could identify all 10 electrode contacts in all 6 participants. The median reference electrode insertion depth angle was 9° (range, -57.5° to 45°), and the median reference electrode insertion length was 42 mm (range, -21-66 mm). Flat panel CT of vestibular implants produces higher-resolution images with fewer artifacts than multidetector row CT, allowing visualization of individual electrode contacts and quantification of their locations relative to vestibular semicircular canals and ampullae. As multichannel vestibular implant imaging improves, so will our understanding of the relationship between electrode placement and vestibular performance.
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Affiliation(s)
- A Hedjoudje
- From the Department of Otolaryngology-Head and Neck Surgery (A.H., D.P.S., B.K.W., J.P.C., C.C.D.S.)
- Division of Interventional Neuroradiology (A.H., M.P.)
- Neuroradiology Unit (A.H.), Service of diagnostic and interventional imaging, Sion Hospital, Sion, Valais, Switzerland
| | - D P Schoo
- From the Department of Otolaryngology-Head and Neck Surgery (A.H., D.P.S., B.K.W., J.P.C., C.C.D.S.)
| | - B K Ward
- From the Department of Otolaryngology-Head and Neck Surgery (A.H., D.P.S., B.K.W., J.P.C., C.C.D.S.)
| | - J P Carey
- From the Department of Otolaryngology-Head and Neck Surgery (A.H., D.P.S., B.K.W., J.P.C., C.C.D.S.)
| | - C C Della Santina
- From the Department of Otolaryngology-Head and Neck Surgery (A.H., D.P.S., B.K.W., J.P.C., C.C.D.S.)
- Department of Biomedical Engineering (C.C.D.S.), Johns Hopkins University School of Medicine, Baltimore, Maryland
- Labyrinth Devices (C.C.D.S.), Baltimore, Maryland
| | - M Pearl
- Division of Interventional Neuroradiology (A.H., M.P.)
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9
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Abstract
OBJECTIVE Thyroglossal duct cysts (TGDCs) are relatively common congenital midline neck masses that are treated with surgical excision. Traditionally these are removed along with any associated tract and the central portion of the hyoid bone through an anterior neck incision. Some patients with TGDCs want to avoid an external neck scar. METHODS We describe the details of a transoral endoscopic vestibular excision of a TGDC and the associated hyoid bone in an adolescent patient. RESULTS This novel approach was successful and there were no complications. CONCLUSION We propose that cervical TGDCs can be safely and completely removed with this approach in appropriately selected patients while avoiding a neck scar.
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Affiliation(s)
- Marisa A Ryan
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University, Baltimore, MD, USA
| | - Jonathon O Russell
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University, Baltimore, MD, USA
| | - Desi P Schoo
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University, Baltimore, MD, USA
| | - Patrick A Upchurch
- Department of Anesthesiology and Critical Care Medicine, Johns Hopkins University, Baltimore, MD, USA
| | - Jonathan M Walsh
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University, Baltimore, MD, USA
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10
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Boutros PJ, Schoo DP, Rahman M, Valentin NS, Chow MR, Ayiotis AI, Morris BJ, Hofner A, Rascon AM, Marx A, Deas R, Fridman GY, Davidovics NS, Ward BK, Treviño C, Bowditch SP, Roberts DC, Lane KE, Gimmon Y, Schubert MC, Carey JP, Jaeger A, Della Santina CC. Continuous vestibular implant stimulation partially restores eye-stabilizing reflexes. JCI Insight 2019; 4:128397. [PMID: 31723056 DOI: 10.1172/jci.insight.128397] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 10/04/2019] [Indexed: 12/17/2022] Open
Abstract
BACKGROUNDBilateral loss of vestibular (inner ear inertial) sensation causes chronically blurred vision during head movement, postural instability, and increased fall risk. Individuals who fail to compensate despite rehabilitation therapy have no adequate treatment options. Analogous to hearing restoration via cochlear implants, prosthetic electrical stimulation of vestibular nerve branches to encode head motion has garnered interest as a potential treatment, but prior studies in humans have not included continuous long-term stimulation or 3D binocular vestibulo-ocular reflex (VOR) oculography, without which one cannot determine whether an implant selectively stimulates the implanted ear's 3 semicircular canals.METHODSWe report binocular 3D VOR responses of 4 human subjects with ototoxic bilateral vestibular loss unilaterally implanted with a Labyrinth Devices Multichannel Vestibular Implant System vestibular implant, which provides continuous, long-term, motion-modulated prosthetic stimulation via electrodes in 3 semicircular canals.RESULTSInitiation of prosthetic stimulation evoked nystagmus that decayed within 30 minutes. Stimulation targeting 1 canal produced 3D VOR responses approximately aligned with that canal's anatomic axis. Targeting multiple canals yielded responses aligned with a vector sum of individual responses. Over 350-812 days of continuous 24 h/d use, modulated electrical stimulation produced stable VOR responses that grew with stimulus intensity and aligned approximately with any specified 3D head rotation axis.CONCLUSIONThese results demonstrate that a vestibular implant can selectively, continuously, and chronically provide artificial sensory input to all 3 implanted semicircular canals in individuals disabled by bilateral vestibular loss, driving reflexive VOR eye movements that approximately align in 3D with the head motion axis encoded by the implant.TRIAL REGISTRATIONClinicalTrials.gov: NCT02725463.FUNDINGNIH/National Institute on Deafness and Other Communication Disorders: R01DC013536 and 2T32DC000023; Labyrinth Devices, LLC; and Med-El GmbH.
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Affiliation(s)
| | - Desi P Schoo
- Department of Otolaryngology - Head & Neck Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Mehdi Rahman
- Labyrinth Devices, LLC, Baltimore, Maryland, USA
| | | | | | | | | | | | | | | | | | - Gene Y Fridman
- Department of Biomedical Engineering and.,Department of Otolaryngology - Head & Neck Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | | | - Bryan K Ward
- Department of Otolaryngology - Head & Neck Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Carolina Treviño
- Department of Otolaryngology - Head & Neck Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Stephen P Bowditch
- Department of Otolaryngology - Head & Neck Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Dale C Roberts
- Department of Otolaryngology - Head & Neck Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Kelly E Lane
- Department of Otolaryngology - Head & Neck Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Yoav Gimmon
- Department of Otolaryngology - Head & Neck Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - Michael C Schubert
- Department of Otolaryngology - Head & Neck Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - John P Carey
- Department of Otolaryngology - Head & Neck Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | | | - Charles C Della Santina
- Department of Biomedical Engineering and.,Department of Otolaryngology - Head & Neck Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland, USA.,Labyrinth Devices, LLC, Baltimore, Maryland, USA
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11
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Abstract
Patient race/ethnicity affects health care utilization, provider trust, and treatment choice. It is uncertain how these influences affect pediatric care. We performed a systematic review (PubMed, Scopus, Web of Science, PsycINFO, Cochrane, and Embase) for articles examining race/ethnicity and parental treatment decision-making, adhering to PRISMA methodology. A total of 9200 studies were identified, and 17 met inclusion criteria. Studies focused on treatment decisions concerning end-of-life care, human papillomavirus vaccination, urological surgery, medication regimens, and dental care. Findings were not uniform between studies; however, pooled results showed (1) racial/ethnic minorities tended to prefer more aggressive end-of-life care; (2) familial tradition of neonatal circumcision influenced the decision to circumcise; and (3) non-Hispanic Whites were less likely to pursue human papillomavirus vaccination but more likely to complete the vaccine series if initiated. The paucity of studies precluded overarching findings regarding the influence of race/ethnicity on parental treatment decisions. Further investigation may improve family-centered communication, parent engagement, and shared decision-making.
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Affiliation(s)
- Vandra C. Harris
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland
| | - Anne R. Links
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland
| | - Jonathan Walsh
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland
| | - Desi P. Schoo
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland
| | - Andrew H. Lee
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland
| | - David E. Tunkel
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland
| | - Emily F. Boss
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland,Department of Health Policy and Management, Johns Hopkins Medical Institutions, Baltimore, Maryland
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12
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Harris VC, Links AR, Hong P, Walsh J, Schoo DP, Tunkel DE, Stewart CM, Boss EF. Consulting Dr. Google: Quality of Online Resources About Tympanostomy Tube Placement. Laryngoscope 2018; 128:496-501. [PMID: 28842989 PMCID: PMC5771888 DOI: 10.1002/lary.26824] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Revised: 06/29/2017] [Accepted: 07/05/2017] [Indexed: 01/04/2023]
Abstract
OBJECTIVE Tympanostomy tube (TT) placement is common in children; however, family-centeredness and utility of online information used for decision making and understanding is unknown. We evaluate the quality of leading Internet resources describing TT placement. STUDY DESIGN Cross-sectional descriptive design. METHODS We performed a Google (Menlo Park, CA) search for terms related to TTs. We defined quality using scaled readability measures (Flesch Reading Ease and Flesch-Kincaid Grade-Level), understandability and actionability (Patient Education Materials Assessment Tool), shared decision-making centrality (Center for Medicare and Medicaid Services informed consent guidelines), and clinical practice guideline (CPG) compatibility. Three reviewers coded each measure. Fleiss κ interrater reliability analysis was performed. RESULTS Ten most frequently encountered websites were analyzed. One of 10 met national health literacy standards (mean 10th-grade level reading, median 9th, range 6-15th). All sites were understandable (mean understandability 81.9%, range 73%-92%). Most had low actionability scores (7 of 10, median 47%, mean 44.6%, range 0-80). Shared decision-making centrality was high (mean 5, range 4-6), but most did not list alternative treatment options. Although CPG compatibility was high (mean 3.4, range 1-4), many websites contained inconsistent recommendations about tube duration, follow-up, and water precautions. There was inter-rater agreement for understandability scoring (κ = 0.20; P = 0.02). CONCLUSION Internet resources about TT placement vary in quality pertaining to health literacy, principles of shared decision making, and consistency with practice guidelines. With growing emphasis on patient-/family-centered engagement in healthcare decision making, standardization of content and improved usability of educational materials for common surgical procedures in children such as tympanostomy tube placement should be a public health priority. LEVEL OF EVIDENCE NA. Laryngoscope, 128:496-501, 2018.
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Affiliation(s)
- Vandra C. Harris
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland
| | - Anne R. Links
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland
| | - Paul Hong
- Division of Otolaryngology-Head and Neck Surgery, Department of Surgery, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Jonathan Walsh
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland
| | - Desi P. Schoo
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland
| | - David E. Tunkel
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland
| | - Charles M. Stewart
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland
| | - Emily F. Boss
- Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Maryland
- Department of Health Policy and Management, Johns Hopkins Medical Institutions, Baltimore, Maryland
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13
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Tan GX, Schoo DP, Della Santina CC, Rahman MA, Valentin Contreras NS, Sun CH, Chiang B. Automated head motion system improves reliability and lessens operator dependence for head impulse testing of vestibular reflexes. IEEE Int Symp Med Meas Appl 2017; 2017:94-99. [PMID: 30221255 DOI: 10.1109/memea.2017.7985856] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Deficiency of the eye-stabilizing vestibulo-ocular reflex (VOR) is a defining feature in multiple diseases of the vestibular labyrinth, which comprises the inner ear's sensors of head rotation, translation and orientation. Diagnosis of these disorders is facilitated by observation and measurement of eye movements during and after head motion. The video head impulse test has recently garnered interest as a clinical diagnostic assessment of vestibular dysfunction. In typical practice, it involves use of video-oculography goggles to measure eye movements while a clinician examiner grasps the subject's head and manually rotates it left or right at sufficient acceleration to cover ~20 deg over ~150 mS, reaching a peak velocity of >120 deg/S midway through the movement. Manual delivery of head impulses incurs significant trial-by-trial, inter-session and inter-operator variability, which lessens the test's reliability, efficiency, safety and standardization across testing facilities. We describe application of a novel, compact and portable automated head impulse test (aHIT™) device that delivers highly repeatable head motion stimuli about axes parallel to those of the vestibular labyrinth's six semicircular canals, with programmable Gaussian and sinusoidal motion profiles at amplitudes, velocities and accelerations sufficient to test VOR function over the spectral range for which the VOR dominates other vision-stabilizing reflexes. We tested the aHIT™ on human subjects and demonstrated its high reproducibility compared to manually delivered head impulses. This device has the potential to be a valuable clinical and research tool for diagnostic evaluation and investigation of the vestibular system.
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Affiliation(s)
- Grace X Tan
- Department of Otolaryngology, Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Desi P Schoo
- Department of Otolaryngology, Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Charles C Della Santina
- Department of Otolaryngology, Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | | | | | - Chen-Hsin Sun
- Department of Ophthalmology, National University Hospital, Singapore
| | - Bryce Chiang
- Emory University School of Medicine, Atlanta, GA, USA
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14
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Mullins RF, Schoo DP, Sohn EH, Flamme-Wiese MJ, Workamelahu G, Johnston RM, Wang K, Tucker BA, Stone EM. The membrane attack complex in aging human choriocapillaris: relationship to macular degeneration and choroidal thinning. Am J Pathol 2014; 184:3142-53. [PMID: 25204844 DOI: 10.1016/j.ajpath.2014.07.017] [Citation(s) in RCA: 157] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2014] [Revised: 06/18/2014] [Accepted: 07/10/2014] [Indexed: 01/19/2023]
Abstract
Age-related macular degeneration (AMD) is a common disease that can result in severe visual impairment. Abnormal regulation of the complement system has been implicated in its pathogenesis, and CFH polymorphisms contribute substantially to risk. How these polymorphisms exert their effects is poorly understood. We performed enzyme-linked immunosorbent assay (ELISA) analysis on young, aged, and AMD choroids to determine the abundance of the membrane attack complex (MAC) and performed immunofluorescence studies on eyes from 117 donors to evaluate the MAC in aging, early AMD, and advanced AMD. Morphometric studies were performed on eyes with high- or low-risk CFH genotypes. ELISA confirmed that MAC increases significantly with aging and with AMD. MAC was localized to Bruch's membrane and the choriocapillaris and was detectable at low levels as early as 5 years of age. Hard drusen were labeled with anti-MAC antibody, but large or confluent drusen and basal deposits were generally unlabeled. Labeling of retinal pigment epithelium was observed in some cases of advanced AMD, but not in early disease. Eyes homozygous for the high-risk CFH genotype had thinner choroids than low-risk homozygotes (P < 0.05). These findings suggest that increased complement activation in AMD and in high-risk genotypes can lead to loss of endothelial cells in early AMD. Treatments to protect the choriocapillaris in early AMD are needed.
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Affiliation(s)
- Robert F Mullins
- Department of Ophthalmology and Visual Sciences, The University of Iowa, Iowa City, Iowa; Stephen A. Wynn Institute for Vision Research, The University of Iowa, Iowa City, Iowa.
| | - Desi P Schoo
- Department of Ophthalmology and Visual Sciences, The University of Iowa, Iowa City, Iowa; Stephen A. Wynn Institute for Vision Research, The University of Iowa, Iowa City, Iowa
| | - Elliott H Sohn
- Department of Ophthalmology and Visual Sciences, The University of Iowa, Iowa City, Iowa; Stephen A. Wynn Institute for Vision Research, The University of Iowa, Iowa City, Iowa
| | - Miles J Flamme-Wiese
- Department of Ophthalmology and Visual Sciences, The University of Iowa, Iowa City, Iowa; Stephen A. Wynn Institute for Vision Research, The University of Iowa, Iowa City, Iowa
| | - Grefachew Workamelahu
- Department of Ophthalmology and Visual Sciences, The University of Iowa, Iowa City, Iowa; Stephen A. Wynn Institute for Vision Research, The University of Iowa, Iowa City, Iowa
| | - Rebecca M Johnston
- Department of Ophthalmology and Visual Sciences, The University of Iowa, Iowa City, Iowa; Stephen A. Wynn Institute for Vision Research, The University of Iowa, Iowa City, Iowa
| | - Kai Wang
- Stephen A. Wynn Institute for Vision Research, The University of Iowa, Iowa City, Iowa; Department of Biostatistics, The University of Iowa, Iowa City, Iowa
| | - Budd A Tucker
- Department of Ophthalmology and Visual Sciences, The University of Iowa, Iowa City, Iowa; Stephen A. Wynn Institute for Vision Research, The University of Iowa, Iowa City, Iowa
| | - Edwin M Stone
- Department of Ophthalmology and Visual Sciences, The University of Iowa, Iowa City, Iowa; Stephen A. Wynn Institute for Vision Research, The University of Iowa, Iowa City, Iowa
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