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Andrade de Carvalho K, Esporcatte LPG, Gomes RLR, Ambrósio R. Multimodal corneal imaging before refractive cataract surgery. Curr Opin Ophthalmol 2024:00055735-990000000-00206. [PMID: 39470459 DOI: 10.1097/icu.0000000000001102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/30/2024]
Abstract
PURPOSE OF REVIEW To prospectively review the advances in diagnostics for refractive cataract surgery, focusing on multimodal corneal analysis. RECENT FINDINGS The article explores the considerations related to planning refractive cataract surgery, emphasizing its potential to enhance patients' vision performance and quality of life. This review explores preoperative analysis in cataract surgery, focusing on assessing the cornea and ocular surface using multimodal diagnostics, including Placido disk-based corneal topography, Scheimpflug tomography OCT (optical coherence tomography), and biomechanical assessment. Wavefront technology, gene therapy, and artificial intelligence are also relevant in enhancing surgical precision and outcomes. It highlights the importance of preoperative thorough evaluations and technological advancements in ophthalmology. SUMMARY The rapid evolution and advancement of technology enable excellent refractive outcomes in most cases following cataract surgery. Consideration of appropriate preoperative factors is essential for achieving the desired postoperative outcome.
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Affiliation(s)
| | - Louise Pellegrino G Esporcatte
- Rio de Janeiro Corneal Tomography and Biomechanics Study Group
- Instituto de Olhos Renato Ambrósio
- Rio Vision Hospital, Rio de Janeiro
- Department of Ophthalmology, Federal University of São Paulo, São Paulo
| | - Rachel L R Gomes
- Rio de Janeiro Corneal Tomography and Biomechanics Study Group
- Rio Vision Hospital, Rio de Janeiro
| | - Renato Ambrósio
- Rio de Janeiro Corneal Tomography and Biomechanics Study Group
- Instituto de Olhos Renato Ambrósio
- Rio Vision Hospital, Rio de Janeiro
- Department of Ophthalmology, Federal University of São Paulo, São Paulo
- Department of Ophthalmology, Federal University the State of Rio de Janeiro (UNIRIO), Rio de Janeiro, Brazil
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Efron N. A quiet revolution in corneal imaging. Clin Exp Optom 2024:1-3. [PMID: 39419763 DOI: 10.1080/08164622.2024.2416455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2024] Open
Affiliation(s)
- Nathan Efron
- Optometry and Vision Science, Queensland University of Technology, Kelvin Grove, Queensland, Australia
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3
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Schmitz F, Klimas R, Spenner M, Schumacher A, Hieke A, Greiner T, Enax-Krumova E, Sgodzai M, Fels M, Brünger J, Huckemann S, Stude P, Tegenthoff M, Gold R, Philipps J, Fisse AL, Grüter T, Pitarokoili K, Motte J, Sturm D. Morphological Differentiation of Corneal Inflammatory Cells: Proposal of Pragmatic Protocol. Cornea 2024:00003226-990000000-00534. [PMID: 38588437 DOI: 10.1097/ico.0000000000003543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Accepted: 02/18/2024] [Indexed: 04/10/2024]
Abstract
PURPOSE Corneal confocal microscopy is a noninvasive imaging technique to analyze corneal nerve fibers and corneal inflammatory cells (CICs). The amount of CICs is a potential biomarker of disease activity in chronic autoinflammatory diseases. To date, there are no standardized criteria for the morphological characterization of CICs. The aim was to establish a protocol for a standardized morphological classification of CICs based on a literature search and to test this protocol for applicability and reliability. METHODS A systematic review of the literature about definitions of CICs was conducted. Existing morphological descriptions were translated into a structured algorithm and applied by raters. Subsequently, the protocol was optimized by reducing and defining the criteria of the cell types. The optimized algorithm was applied by 4 raters. The interrater reliability was calculated using Fleiss kappa (K). RESULTS A systematic review of the literature revealed no uniform morphological criteria for the differentiation of the individual cell types in CICs. Our first protocol achieved only a low level of agreement between 3 raters (K = 0.09; 1062 rated cells). Our revised protocol was able to achieve a higher interrater reliability with 3 (K = 0.64; 471 rated cells) and 4 (K = 0.61; 628 rated cells) raters. CONCLUSIONS The indirect use of criteria from the literature leads to a high error rate. By clearly defining the individual cell types and standardizing the protocol, reproducible results were obtained, allowing the introduction of this protocol for the future evaluation of CICs in the corneal confocal microscopy.
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Affiliation(s)
- Fynn Schmitz
- Department of Neurology, St. Josef-Hospital, Ruhr-University Bochum, Bochum, Germany
- Immune-mediated Neuropathies Biobank (INHIBIT), Ruhr-University Bochum, Bochum, Germany
| | - Rafael Klimas
- Department of Neurology, St. Josef-Hospital, Ruhr-University Bochum, Bochum, Germany
- Immune-mediated Neuropathies Biobank (INHIBIT), Ruhr-University Bochum, Bochum, Germany
| | - Marie Spenner
- Department of Neurology, St. Josef-Hospital, Ruhr-University Bochum, Bochum, Germany
- Immune-mediated Neuropathies Biobank (INHIBIT), Ruhr-University Bochum, Bochum, Germany
| | - Aurelian Schumacher
- Department of Neurology, St. Josef-Hospital, Ruhr-University Bochum, Bochum, Germany
- Immune-mediated Neuropathies Biobank (INHIBIT), Ruhr-University Bochum, Bochum, Germany
| | - Alina Hieke
- Department of Neurology, St. Josef-Hospital, Ruhr-University Bochum, Bochum, Germany
- Immune-mediated Neuropathies Biobank (INHIBIT), Ruhr-University Bochum, Bochum, Germany
| | - Tineke Greiner
- Department of Neurology, BG University Hospital Bergmannsheil, Ruhr-University Bochum, Germany
| | - Elena Enax-Krumova
- Immune-mediated Neuropathies Biobank (INHIBIT), Ruhr-University Bochum, Bochum, Germany
- Department of Neurology, BG University Hospital Bergmannsheil, Ruhr-University Bochum, Germany
| | - Melissa Sgodzai
- Department of Neurology, St. Josef-Hospital, Ruhr-University Bochum, Bochum, Germany
- Immune-mediated Neuropathies Biobank (INHIBIT), Ruhr-University Bochum, Bochum, Germany
| | - Miriam Fels
- Department of Neurology, St. Josef-Hospital, Ruhr-University Bochum, Bochum, Germany
- Immune-mediated Neuropathies Biobank (INHIBIT), Ruhr-University Bochum, Bochum, Germany
| | - Jil Brünger
- Department of Neurology, St. Josef-Hospital, Ruhr-University Bochum, Bochum, Germany
- Immune-mediated Neuropathies Biobank (INHIBIT), Ruhr-University Bochum, Bochum, Germany
| | - Sophie Huckemann
- Department of Neurology, St. Josef-Hospital, Ruhr-University Bochum, Bochum, Germany
- Immune-mediated Neuropathies Biobank (INHIBIT), Ruhr-University Bochum, Bochum, Germany
| | - Philipp Stude
- Department of Neurology, BG University Hospital Bergmannsheil, Ruhr-University Bochum, Germany
| | - Martin Tegenthoff
- Immune-mediated Neuropathies Biobank (INHIBIT), Ruhr-University Bochum, Bochum, Germany
- Department of Neurology, BG University Hospital Bergmannsheil, Ruhr-University Bochum, Germany
| | - Ralf Gold
- Department of Neurology, St. Josef-Hospital, Ruhr-University Bochum, Bochum, Germany
- Immune-mediated Neuropathies Biobank (INHIBIT), Ruhr-University Bochum, Bochum, Germany
| | - Jörg Philipps
- Department of Neurology and Neurogeriatrics, Johannes Wesling Klinikum Minden, Minden, Germany
| | - Anna Lena Fisse
- Department of Neurology, St. Josef-Hospital, Ruhr-University Bochum, Bochum, Germany
- Immune-mediated Neuropathies Biobank (INHIBIT), Ruhr-University Bochum, Bochum, Germany
| | - Thomas Grüter
- Department of Neurology, St. Josef-Hospital, Ruhr-University Bochum, Bochum, Germany
- Immune-mediated Neuropathies Biobank (INHIBIT), Ruhr-University Bochum, Bochum, Germany
| | - Kalliopi Pitarokoili
- Department of Neurology, St. Josef-Hospital, Ruhr-University Bochum, Bochum, Germany
- Immune-mediated Neuropathies Biobank (INHIBIT), Ruhr-University Bochum, Bochum, Germany
| | - Jeremias Motte
- Department of Neurology, St. Josef-Hospital, Ruhr-University Bochum, Bochum, Germany
- Immune-mediated Neuropathies Biobank (INHIBIT), Ruhr-University Bochum, Bochum, Germany
| | - Dietrich Sturm
- Immune-mediated Neuropathies Biobank (INHIBIT), Ruhr-University Bochum, Bochum, Germany
- Department of Neurology, BG University Hospital Bergmannsheil, Ruhr-University Bochum, Germany
- Department of Neurology, Agaplesion Bethesda Krankenhaus, Wuppertal, Germany; and
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Zhao JY, He YX, Wu ML, Wang RQ. The application of high-throughput sequencing technology in corneal diseases. Int Ophthalmol 2024; 44:53. [PMID: 38340174 PMCID: PMC10858842 DOI: 10.1007/s10792-024-03049-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Accepted: 01/18/2024] [Indexed: 02/12/2024]
Abstract
High-throughput sequencing technology, also known as next-generation sequencing technology, can explore new biomarkers and specific gene mutations. It has a pivotal role in promoting the gene research, which can limit the detection area, lessen the time needed for sequencing. Also, it can quickly screen out the suspected pathogenic genes of patients, gain the necessary genetic data, and provide the basis for clinical diagnosis and genetic counseling. In the research of corneal diseases, through the DNA sequencing of patients' diseased cells, it can provide a deeper understanding of corneal diseases and improve the diagnosis, classification and treatment alternatives of various corneal diseases. This article will introduce the application progress of high-throughput sequencing technology in corneal diseases, which will help to understand the application of this technology in various corneal diseases.
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Affiliation(s)
- Jing Yi Zhao
- The Second Clinical Medical College of Jilin University, Changchun, 130012, Jilin, China
| | - Yu Xi He
- The Eye Center, The Second Hospital of Jilin University, Changchun, 130041, Jilin, China
| | - Mei Liang Wu
- The Eye Center, The Second Hospital of Jilin University, Changchun, 130041, Jilin, China
| | - Rui Qing Wang
- The Eye Center, The Second Hospital of Jilin University, Changchun, 130041, Jilin, China.
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Raasing LRM, Vogels OJM, Datema M, Tannemaat MR, Veltkamp M, Grutters JC. Fully Automatic, Semiautomatic, and Manual Corneal Nerve Fiber Analysis in Patients With Sarcoidosis. Transl Vis Sci Technol 2023; 12:3. [PMID: 38047722 PMCID: PMC10702781 DOI: 10.1167/tvst.12.12.3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Accepted: 11/03/2023] [Indexed: 12/05/2023] Open
Abstract
Purpose No guidelines are available on the preferred method for analyzing corneal confocal microscopy (CCM) data. Manual, semiautomatic, and automatic analyzes are all currently in use. The purpose of the present study was threefold. First, we aimed to investigate the different methods for CCM analysis in patients with and without small fiber neuropathy (SFN). Second, to determine the correlation of different methods for measuring corneal nerve fiber length (CNFL) and nerve fiber area (NFA). Finally, we investigated the added value of automatic NFA analysis. Methods We included 20 healthy controls and 80 patients with sarcoidosis, 31 with established SFN and 49 without SFN. The CNFL was measured using CCMetrics, ACCMetrics, and NeuronJ. NFA was measured with NFA FIJI and ACCMetrics NFA. Results CNFL and NFA could not distinguish sarcoidosis with and without SFN or healthy controls. CCMetrics, NeuronJ, and ACCMetrics CNFL highly correlated. Also, NFA FIJI and ACCMetrics NFA highly correlated. Reproducing a nonlinear formula between CNFL and NFA confirmed the quadratic relation between NFA FIJI and ACCMetrics CNFL. CCMetrics and NeuronJ instead showed a square root relationship and seem to be less comparable owing to differences between automatic and manual techniques. Conclusions ACCMetrics can be used for fully automatic analysis of CCM images to optimize efficiency. However, CNFL and NFA do not seem to have a discriminatory value for SFN in sarcoidosis. Further research is needed to determine the added value and normative values of NFA in CCM analysis. Translational Relevance Our study improves the knowledge about CCM software and pathophysiology of SFN.
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Affiliation(s)
- Lisette R. M. Raasing
- ILD Center of Excellence, Department of Pulmonology, St. Antonius Hospital, Nieuwegein, the Netherlands
| | - Oscar J. M. Vogels
- ILD Center of Excellence, Department of Neurology, St. Antonius Hospital, Nieuwegein, the Netherlands
| | - Mirjam Datema
- Department of Clinical Neurophysiology, St. Antonius Hospital, Nieuwegein, the Netherlands
| | - Martijn R. Tannemaat
- Department of Clinical Neurophysiology, Leiden University Medical Center, Leiden, the Netherlands
| | - Marcel Veltkamp
- ILD Center of Excellence, Department of Pulmonology, St. Antonius Hospital, Nieuwegein, the Netherlands
- Division of Heart and Lungs, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Jan C. Grutters
- ILD Center of Excellence, Department of Pulmonology, St. Antonius Hospital, Nieuwegein, the Netherlands
- Division of Heart and Lungs, University Medical Center Utrecht, Utrecht, the Netherlands
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Pattan HF, Liu X, Tankam P. Non-invasive in vivo imaging of human corneal microstructures with optical coherence microscopy. BIOMEDICAL OPTICS EXPRESS 2023; 14:4888-4900. [PMID: 37791273 PMCID: PMC10545177 DOI: 10.1364/boe.495242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 08/06/2023] [Accepted: 08/16/2023] [Indexed: 10/05/2023]
Abstract
Non-invasive imaging systems with cellular-level resolution offer the opportunity to identify biomarkers of the early stage of corneal diseases, enabling early intervention, monitoring of disease progression, and evaluating treatment efficacy. In this study, a non-contact polarization-dependent optical coherence microscope (POCM) was developed to enable non-invasive in vivo imaging of human corneal microstructures. The system integrated quarter-wave plates into the sample and reference arms of the interferometer to enable deeper penetration of light in tissues as well as mitigate the strong specular reflection from the corneal surface. A common-path approach was adopted to enable control over the polarization in a free space configuration, thus alleviating the need for a broadband polarization-maintained fiber. The POCM achieved volumetric imaging of corneal microstructures, including endothelial cells over a field of view 0.5 × 0.5 mm2 with an almost isotropic resolution of ∼2.2 µm and a volume (500 × 500 × 2048 voxels) rate of 1 Hz. A self-interference approach between the corneal surface and underlying layers was also developed to lessen the corneal curvature and axial motion artifacts, thus enabling high-resolution imaging of microstructures in the anterior cornea, including squamous epithelial cells, wing epithelial cells, basal epithelial cells, sub-basal nerve plexus, and stromal keratocytes.
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Affiliation(s)
- Hadiya F. Pattan
- School of Optometry, Indiana University, Bloomington, IN, 47405, USA
| | - Xiao Liu
- School of Optometry, Indiana University, Bloomington, IN, 47405, USA
| | - Patrice Tankam
- School of Optometry, Indiana University, Bloomington, IN, 47405, USA
- Intelligent Systems Engineering, Luddy School of Informatics, Computing, and Engineering, Indiana University, Bloomington, IN, 47405, USA
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Sierra-Silvestre E, Andrade RJ, Colorado LH, Edwards K, Coppieters MW. Occurrence of corneal sub-epithelial microneuromas and axonal swelling in people with diabetes with and without (painful) diabetic neuropathy. Diabetologia 2023; 66:1719-1734. [PMID: 37301795 PMCID: PMC10257488 DOI: 10.1007/s00125-023-05945-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Accepted: 04/04/2023] [Indexed: 06/12/2023]
Abstract
AIMS/HYPOTHESIS Non-invasive in vivo corneal confocal microscopy is gaining ground as an alternative to skin punch biopsy to evaluate small-diameter nerve fibre characteristics. This study aimed to further explore corneal nerve fibre pathology in diabetic neuropathy. METHODS This cross-sectional study quantified and compared corneal nerve morphology and microneuromas in participants without diabetes (n=27), participants with diabetes but without distal symmetrical polyneuropathy (DSPN; n=33), participants with non-painful DSPN (n=25) and participants with painful DSPN (n=18). Clinical and electrodiagnostic criteria were used to diagnose DSPN. ANCOVA was used to compare nerve fibre morphology in the central cornea and inferior whorl, and the number of corneal sub-epithelial microneuromas between groups. Fisher's exact tests were used to compare the type and presence of corneal sub-epithelial microneuromas and axonal swelling between groups. RESULTS Various corneal nerve morphology metrics, such as corneal nerve fibre length and density, showed a progressive decline across the groups (p<0.001). In addition, axonal swelling was present more frequently (p=0.018) and in higher numbers (p=0.03) in participants with painful compared with non-painful DSPN. The frequency of axonal distension, a type of microneuroma, was increased in participants with painful and non-painful DSPN compared to participants with diabetes but without DSPN and participants without diabetes (all p≤0.042). The combined presence of all microneuromas and axonal swelling was increased in participants with painful DSPN compared with all other groups (p≤0.026). CONCLUSIONS/INTERPRETATION Microneuromas and axonal swelling in the cornea increase in prevalence from participants with diabetes to participants with non-painful DSPN and participants with painful DSPN.
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Affiliation(s)
- Eva Sierra-Silvestre
- Menzies Health Institute Queensland, Griffith University, Brisbane, QLD, Australia
- School of Health Sciences and Social Work, Griffith University, Brisbane, QLD, Australia
- Amsterdam Movement Sciences - Musculoskeletal Health Program, Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
| | - Ricardo J Andrade
- Menzies Health Institute Queensland, Griffith University, Brisbane, QLD, Australia
- Movement - Interactions - Performance (MIP), Nantes University, Nantes, France
| | - Luisa H Colorado
- Centre for Vision and Eye Research, School of Optometry and Vision Science, Queensland University of Technology, Brisbane, Australia
| | - Katie Edwards
- Centre for Vision and Eye Research, School of Optometry and Vision Science, Queensland University of Technology, Brisbane, Australia
| | - Michel W Coppieters
- Menzies Health Institute Queensland, Griffith University, Brisbane, QLD, Australia.
- School of Health Sciences and Social Work, Griffith University, Brisbane, QLD, Australia.
- Amsterdam Movement Sciences - Musculoskeletal Health Program, Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands.
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Thimm A, Brakemeier S, Dag M, Munoz Rosales J, Stolte B, Kleinschnitz C, Stettner M, Hagenacker T. Corneal confocal microscopy reveals small nerve fibre loss correlating with motor function in adult spinal muscular atrophy. Eur J Neurol 2023; 30:2821-2827. [PMID: 37159488 DOI: 10.1111/ene.15852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Revised: 04/20/2023] [Accepted: 05/04/2023] [Indexed: 05/11/2023]
Abstract
BACKGROUND 5q Spinal muscular atrophy (SMA) is a progressive, inherited, and severely disabling - yet treatable - motor neuron disease. Although treatment options have evolved in recent years, biomarkers for treatment monitoring and prognosis prediction remain elusive. Here, we investigated the utility of corneal confocal microscopy (CCM), a non-invasive imaging technique to quantify small corneal nerve fibres in vivo, as a diagnostic tool in adult SMA. METHODS In this cross-sectional study, 19 patients with SMA type 3 and 19 healthy controls underwent CCM to measure corneal nerve fibre density (CNFD), corneal nerve fibre length (CNFL), and corneal nerve branch density (CNBD), as well as corneal immune cell infiltration. Hammersmith Functional Motor Scale Expanded (HFMSE) and Revised Upper Limb Module (RULM) scores and a 6-Minute Walk Test (6MWT) were conducted to explore any correlation between CCM findings and motor function. RESULTS Corneal nerve fibre parameters were decreased in SMA patients versus healthy controls (CNFD: p = 0.030; CNFL: p = 0.013; CNBD: p = 0.020) in the absence of relevant immune cell infiltration. CNFD and CNFL correlated with HFMSE scores (CNFD: r = 0.492, p = 0.038; CNFL: r = 0.484, p = 0.042) and distance covered in the 6MWT (CNFD: r = 0.502, p = 0.042; CNFL: r = 0.553, p = 0.023). CONCLUSIONS Corneal confocal microscopy CCM reveals sensory neurodegeneration in SMA, thereby supporting a multisystem view of the disorder. Subclinical small nerve fibre damage correlated with motor function. Thus, CCM may be ideally suited for treatment monitoring and prognosis.
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Affiliation(s)
- Andreas Thimm
- Department of Neurology and Center for Translational Neuro- and Behavioral Sciences (C-TNBS), University Hospital Essen, Essen, Germany
| | - Svenja Brakemeier
- Department of Neurology and Center for Translational Neuro- and Behavioral Sciences (C-TNBS), University Hospital Essen, Essen, Germany
| | - Merve Dag
- Department of Neurology and Center for Translational Neuro- and Behavioral Sciences (C-TNBS), University Hospital Essen, Essen, Germany
| | - Juan Munoz Rosales
- Department of Neurology and Center for Translational Neuro- and Behavioral Sciences (C-TNBS), University Hospital Essen, Essen, Germany
| | - Benjamin Stolte
- Department of Neurology and Center for Translational Neuro- and Behavioral Sciences (C-TNBS), University Hospital Essen, Essen, Germany
| | - Christoph Kleinschnitz
- Department of Neurology and Center for Translational Neuro- and Behavioral Sciences (C-TNBS), University Hospital Essen, Essen, Germany
| | - Mark Stettner
- Department of Neurology and Center for Translational Neuro- and Behavioral Sciences (C-TNBS), University Hospital Essen, Essen, Germany
| | - Tim Hagenacker
- Department of Neurology and Center for Translational Neuro- and Behavioral Sciences (C-TNBS), University Hospital Essen, Essen, Germany
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Preston FG, Riley DR, Azmi S, Alam U. Painful Diabetic Peripheral Neuropathy: Practical Guidance and Challenges for Clinical Management. Diabetes Metab Syndr Obes 2023; 16:1595-1612. [PMID: 37288250 PMCID: PMC10243347 DOI: 10.2147/dmso.s370050] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Accepted: 05/16/2023] [Indexed: 06/09/2023] Open
Abstract
Painful diabetic peripheral neuropathy (PDPN) is present in nearly a quarter of people with diabetes. It is estimated to affect over 100 million people worldwide. PDPN is associated with impaired daily functioning, depression, sleep disturbance, financial instability, and a decreased quality of life. Despite its high prevalence and significant health burden, it remains an underdiagnosed and undertreated condition. PDPN is a complex pain phenomenon with the experience of pain associated with and exacerbated by poor sleep and low mood. A holistic approach to patient-centred care alongside the pharmacological therapy is required to maximise benefit. A key treatment challenge is managing patient expectation, as a good outcome from treatment is defined as a reduction in pain of 30-50%, with a complete pain-free outcome being rare. The future for the treatment of PDPN holds promise, despite a 20-year void in the licensing of new analgesic agents for neuropathic pain. There are over 50 new molecular entities reaching clinical development and several demonstrating benefit in early-stage clinical trials. We review the current approaches to its diagnosis, the tools, and questionnaires available to clinicians, international guidance on PDPN management, and existing pharmacological and non-pharmacological treatment options. We synthesise evidence and the guidance from the American Association of Clinical Endocrinology, American Academy of Neurology, American Diabetes Association, Diabetes Canada, German Diabetes Association, and the International Diabetes Federation into a practical guide to the treatment of PDPN and highlight the need for future research into mechanistic-based treatments in order to prioritise the development of personalised medicine.
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Affiliation(s)
- Frank G Preston
- Department of Cardiovascular & Metabolic Medicine, Institute of Life Course and Medical Sciences and the Pain Research Institute, University of Liverpool, Liverpool, UK
| | - David R Riley
- Department of Cardiovascular & Metabolic Medicine, Institute of Life Course and Medical Sciences and the Pain Research Institute, University of Liverpool, Liverpool, UK
| | - Shazli Azmi
- Institute of Cardiovascular Science, University of Manchester and Manchester Diabetes Centre, Manchester Foundation Trust, Manchester, UK
| | - Uazman Alam
- Department of Cardiovascular & Metabolic Medicine, Institute of Life Course and Medical Sciences and the Pain Research Institute, University of Liverpool, Liverpool, UK
- Liverpool Centre for Cardiovascular Science, University of Liverpool and Liverpool University Hospital NHS Foundation Trust, Liverpool, UK
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Sharma S, Rayman G. Frontiers in diagnostic and therapeutic approaches in diabetic sensorimotor neuropathy (DSPN). Front Endocrinol (Lausanne) 2023; 14:1165505. [PMID: 37274325 PMCID: PMC10234502 DOI: 10.3389/fendo.2023.1165505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Accepted: 05/01/2023] [Indexed: 06/06/2023] Open
Abstract
Diabetes sensory polyneuropathy (DSPN) is a significant complication of diabetes affecting up to 50% of patients in their lifetime and approximately 20% of patients suffer from painful diabetes neuropathic pain. DSPN - both painless and painful - leads to considerable morbidity including reduction of quality of life, increased lower limb amputations and is associated with worsening mortality. Significant progress has been made in the understanding of pathogenesis of DSPN and the last decade has seen newer techniques aimed at its earlier diagnosis. The management of painful DSPN remains a challenge despite advances made in the unravelling the pathogenesis of pain and its transmission. This article discusses the heterogenous clinical presentation of DSPN and the need to exclude key differential diagnoses. Furthermore, it reviews in detail the current diagnostic techniques involving both large and small neural fibres, their limitations and advantages and current place in the diagnosis of DSPN. Finally, the management of DSPN including newer pharmacotherapies are also discussed.
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Affiliation(s)
- Sanjeev Sharma
- Department of Diabetes and Endocrinology, Ipswich Hospital, East Suffolk and North East Essex NHS Foundation Trust (ESNEFT), Ipswich, United Kingdom
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Zhang J, Mazlin V, Fei K, Boccara AC, Yuan J, Xiao P. Time-domain full-field optical coherence tomography (TD-FF-OCT) in ophthalmic imaging. Ther Adv Chronic Dis 2023; 14:20406223231170146. [PMID: 37152350 PMCID: PMC10161339 DOI: 10.1177/20406223231170146] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2022] [Accepted: 03/29/2023] [Indexed: 05/09/2023] Open
Abstract
Ocular imaging plays an irreplaceable role in the evaluation of eye diseases. Developing cellular-resolution ophthalmic imaging technique for more accurate and effective diagnosis and pathogenesis analysis of ocular diseases is a hot topic in the cross-cutting areas of ophthalmology and imaging. Currently, ocular imaging with traditional optical coherence tomography (OCT) is limited in lateral resolution and thus can hardly resolve cellular structures. Conventional OCT technology obtains ultra-high resolution at the expense of a certain imaging range and cannot achieve full field of view imaging. In the early years, Time-domain full-field OCT (TD-FF-OCT) has been mainly used for ex vivo ophthalmic tissue studies, limited by the low speed and low full-well capacity of existing two-dimensional (2D) cameras. The recent improvements in system design opened new imaging possibilities for in vivo applications thanks to its distinctive optical properties of TD-FF-OCT such as a spatial resolution almost insensitive to aberrations, and the possibility to control the curvature of the optical slice. This review also attempts to look at the future directions of TD-FF-OCT evolution, for example, the potential transfer of the functional-imaging dynamic TD-FF-OCT from the ex vivo into in vivo use and its expected benefit in basic and clinical ophthalmic research. Through non-invasive, wide-field, and cellular-resolution imaging, TD-FF-OCT has great potential to be the next-generation imaging modality to improve our understanding of human eye physiology and pathology.
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Affiliation(s)
- Jinze Zhang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Viacheslav Mazlin
- ESPCI Paris, PSL University, CNRS, Langevin Institute, Paris, France
| | - Keyi Fei
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | | | - Jin Yuan
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Jinsui Road 7, Guangzhou 510060, Guangdong, China
| | - Peng Xiao
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Jinsui Road 7, Guangzhou 510060, Guangdong, China
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12
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Guldiken YC, Petropoulos IN, Malik A, Malik RA, Yüksel R, Budak F, Selekler HM. Corneal confocal microscopy identifies corneal nerve fiber loss in patients with migraine. Cephalalgia 2023; 43:3331024231170810. [PMID: 37177828 DOI: 10.1177/03331024231170810] [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: 05/15/2023]
Abstract
BACKGROUND/HYPOTHESIS Migraine affects >1 billion people but its pathophysiology remains poorly understood. Alterations in the trigeminovascular system play an important role. We have compared corneal nerve morphology in patients with migraine to healthy controls. METHODS Sixty patients with episodic (n = 32) or chronic (n = 28) migraine and 20 age-matched healthy control subjects were studied cross-sectionally. Their migraine characteristics and signs and symptoms of dry eyes were assessed. Manual and automated quantification of corneal nerves was undertaken by corneal confocal microscopy. RESULTS In patients with migraine compared to controls, manual corneal nerve fiber density (P < 0.001), branch density (P = 0.015) and length (P < 0.001); and automated corneal nerve fiber density (P < 0.001), branch density (P < 0.001), length (P < 0.001), total branch density (P < 0.001), nerve fiber area (P < 0.001), nerve fiber width (P = 0.045) and fractal dimension (P < 0.001) were lower. Automated corneal nerve fiber density was higher in patients with episodic migraine and aura (P = 0.010); and fractal dimension (P = 0.029) was lower in patients with more headache days in the last three months. Automated corneal nerve fiber density predicted a significant amount of the observed variance in pain intensity (adjusted r2 = 0.14, partial r = -0.37, P = 0.004) in patients with migraine. CONCLUSIONS Corneal confocal microscopy reveals corneal nerve loss in patients with migraine. It may serve as an objective imaging biomarker of neurodegeneration in migraine.
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Affiliation(s)
- Yigit Can Guldiken
- Department of Neurology, Kocaeli University Research and Application Hospital, İzmit/Kocaeli, Turkey
| | | | - Ayesha Malik
- Weill Cornell Medicine-Qatar, Qatar Foundation, Education City, Doha, Qatar
| | - Rayaz A Malik
- Weill Cornell Medicine-Qatar, Qatar Foundation, Education City, Doha, Qatar
| | - Refref Yüksel
- Department of Ophthalmology, Kocaeli University Research and Application Hospital, İzmit/Kocaeli, Turkey
| | - Faik Budak
- Department of Neurology, Kocaeli University Research and Application Hospital, İzmit/Kocaeli, Turkey
| | - Hamit Macit Selekler
- Department of Neurology, Kocaeli University Research and Application Hospital, İzmit/Kocaeli, Turkey
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13
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Thimm A, Carpinteiro A, Oubari S, Papathanasiou M, Kessler L, Rischpler C, Malik RA, Herrmann K, Reinhardt HC, Rassaf T, Kleinschnitz C, Hagenacker T, Stettner M. Corneal confocal microscopy identifies corneal nerve loss and increased Langerhans cells in presymptomatic carriers and patients with hereditary transthyretin amyloidosis. J Neurol 2023:10.1007/s00415-023-11689-z. [PMID: 37014422 DOI: 10.1007/s00415-023-11689-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 03/21/2023] [Accepted: 03/25/2023] [Indexed: 04/05/2023]
Abstract
BACKGROUND Hereditary transthyretin amyloidosis (ATTRv amyloidosis) is a rare, but life-threatening protein misfolding disorder due to TTR gene mutations. Cardiomyopathy (ATTRv-CM) and polyneuropathy (ATTRv-PN) with early small nerve fibre involvement are the most common manifestations. Timely diagnosis and treatment initiation are key to limiting progression of disease. Corneal confocal microscopy (CCM) is a non-invasive method to quantify corneal small nerve fibres and immune cell infiltrates in vivo. METHODS This cross-sectional study investigated the utility of CCM in 20 patients with ATTRv amyloidosis (ATTRv-CM, n = 6; ATTRv-PN, n = 14) and presymptomatic carriers (n = 5) compared to 20 age- and sex-matched healthy controls. Corneal nerve fibre density, corneal nerve fibre length, corneal nerve branch density, and cell infiltrates were assessed. RESULTS Corneal nerve fibre density and nerve fibre length were significantly lower in patients with ATTRv amyloidosis compared to healthy controls regardless of the clinical phenotype (ATTRv-CM, ATTRv-PN) and corneal nerve fibre density was significantly lower in presymptomatic carriers. Immune cell infiltrates were only evident in patients with ATTRv amyloidosis, which correlated with reduced corneal nerve fibre density. CONCLUSIONS CCM identifies small nerve fibre damage in presymptomatic carriers and symptomatic patients with ATTRv amyloidosis and may serve as a predictive surrogate marker to identify individuals at risk of developing symptomatic amyloidosis. Furthermore, increased corneal cell infiltration suggests an immune-mediated mechanism in the pathogenesis of amyloid neuropathy.
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Affiliation(s)
- Andreas Thimm
- Department of Neurology, University Hospital Essen, Hufelandstrasse 55, 45147, Essen, Germany.
- Center for Translational Neuro- and Behavioral Scienes (C-TNBS), University Hospital Essen, Essen, Germany.
| | - Alexander Carpinteiro
- Department of Hematology and Stem Cell Transplantation, West German Cancer Center, University Hospital Essen, Essen, Germany
- Institute of Molecular Biology, University of Duisburg-Essen, Essen, Germany
| | - Sara Oubari
- Department of Hematology and Stem Cell Transplantation, West German Cancer Center, University Hospital Essen, Essen, Germany
| | - Maria Papathanasiou
- Department of Cardiology and Vascular Medicine, West German Heart and Vascular Center, University Hospital Essen, Essen, Germany
| | - Lukas Kessler
- Department of Nuclear Medicine, University Hospital Essen, Essen, Germany
| | | | - Rayaz Ahmed Malik
- Institute of Cardiovascular Science, Faculty of Medical and Human Sciences, University of Manchester, Manchester, UK
- Weill Cornell Medicine-Qatar, Education City, Doha, Qatar
| | - Ken Herrmann
- Department of Nuclear Medicine, University Hospital Essen, Essen, Germany
| | - Hans Christian Reinhardt
- Department of Hematology and Stem Cell Transplantation, West German Cancer Center, University Hospital Essen, Essen, Germany
| | - Tienush Rassaf
- Department of Cardiology and Vascular Medicine, West German Heart and Vascular Center, University Hospital Essen, Essen, Germany
| | - Christoph Kleinschnitz
- Department of Neurology, University Hospital Essen, Hufelandstrasse 55, 45147, Essen, Germany
- Center for Translational Neuro- and Behavioral Scienes (C-TNBS), University Hospital Essen, Essen, Germany
| | - Tim Hagenacker
- Department of Neurology, University Hospital Essen, Hufelandstrasse 55, 45147, Essen, Germany
- Center for Translational Neuro- and Behavioral Scienes (C-TNBS), University Hospital Essen, Essen, Germany
| | - Mark Stettner
- Department of Neurology, University Hospital Essen, Hufelandstrasse 55, 45147, Essen, Germany
- Center for Translational Neuro- and Behavioral Scienes (C-TNBS), University Hospital Essen, Essen, Germany
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14
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Machet J, Park M, Richardson A, Carnell M, Mouat MA, Smith NJ, Turner N, Cochran BJ, Rye KA, Di Girolamo N. Type 2 diabetes influences intraepithelial corneal nerve parameters and corneal stromal-epithelial nerve penetration sites. J Diabetes Investig 2023; 14:591-601. [PMID: 36727569 PMCID: PMC10034950 DOI: 10.1111/jdi.13974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 12/16/2022] [Accepted: 01/01/2023] [Indexed: 02/03/2023] Open
Abstract
INTRODUCTION The quantification of intraepithelial corneal basal nerve parameters by in vivo confocal microscopy represents a promising modality to identify the earliest manifestations of diabetic peripheral neuropathy. However, its diagnostic accuracy is hampered by its dependence on neuron length, with minimal consideration for other parameters, including the origin of these nerves, the corneal stromal-epithelial nerve penetration sites. This study sought to utilize high-resolution images of murine corneal nerves to analyze comprehensively the morphological changes associated with type 2 diabetes progression. MATERIALS AND METHODS βIII-Tubulin immunostained corneas from prediabetic and type 2 diabetic mice and their respective controls were imaged by scanning confocal microscopy and analyzed automatically for nerve parameters. Additionally, the number and distribution of penetration sites was manually ascertained and the average length of the axons exiting them was computed. RESULTS The earliest detectable changes included a significant increase in nerve density (6.06 ± 0.41% vs 8.98 ± 1.99%, P = 0.03) and branching (2867.8 ± 271.3/mm2 vs 4912.1 ± 1475.3/mm2 , P = 0.03), and in the number of penetration sites (258.80 ± 20.87 vs 422.60 ± 63.76, P = 0.0002) at 8 weeks of age. At 16 weeks, corneal innervation decreased, most notably in the periphery. The number of penetration sites remained significantly elevated relative to controls throughout the monitoring period. Similarly, prediabetic mice exhibited an increased number of penetration sites (242.2 ± 13.55 vs 305.6 ± 30.96, P = 0.003) without significant changes to the nerves. CONCLUSIONS Our data suggest that diabetic peripheral neuropathy may be preceded by a phase of neuron growth rather than regression, and that the peripheral cornea is more sensitive than the center for detecting changes in innervation.
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Affiliation(s)
- Joshua Machet
- School of Biomedical Sciences, Faculty of Medicine and Health, University of New South Wales, Sydney, NSW, Australia
| | - Mijeong Park
- School of Biomedical Sciences, Faculty of Medicine and Health, University of New South Wales, Sydney, NSW, Australia
| | - Alexander Richardson
- School of Biomedical Sciences, Faculty of Medicine and Health, University of New South Wales, Sydney, NSW, Australia
| | - Michael Carnell
- Katharina Gaus Light Microscopy Facility, Mark Wainwright Analytical Centre, University of New South Wales, Sydney, NSW, Australia
| | - Margaret A Mouat
- School of Biomedical Sciences, Faculty of Medicine and Health, University of New South Wales, Sydney, NSW, Australia
| | - Nicola J Smith
- School of Biomedical Sciences, Faculty of Medicine and Health, University of New South Wales, Sydney, NSW, Australia
| | - Nigel Turner
- School of Biomedical Sciences, Faculty of Medicine and Health, University of New South Wales, Sydney, NSW, Australia
- Victor Chang Cardiac Research Institute, Sydney, NSW, Australia
| | - Blake J Cochran
- School of Biomedical Sciences, Faculty of Medicine and Health, University of New South Wales, Sydney, NSW, Australia
| | - Kerry-Anne Rye
- School of Biomedical Sciences, Faculty of Medicine and Health, University of New South Wales, Sydney, NSW, Australia
| | - Nick Di Girolamo
- School of Biomedical Sciences, Faculty of Medicine and Health, University of New South Wales, Sydney, NSW, Australia
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15
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Kv R, Prasad K, Peralam Yegneswaran P. Segmentation and Classification Approaches of Clinically Relevant Curvilinear Structures: A Review. J Med Syst 2023; 47:40. [PMID: 36971852 PMCID: PMC10042761 DOI: 10.1007/s10916-023-01927-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Accepted: 02/25/2023] [Indexed: 03/29/2023]
Abstract
Detection of curvilinear structures from microscopic images, which help the clinicians to make an unambiguous diagnosis is assuming paramount importance in recent clinical practice. Appearance and size of dermatophytic hyphae, keratitic fungi, corneal and retinal vessels vary widely making their automated detection cumbersome. Automated deep learning methods, endowed with superior self-learning capacity, have superseded the traditional machine learning methods, especially in complex images with challenging background. Automatic feature learning ability using large input data with better generalization and recognition capability, but devoid of human interference and excessive pre-processing, is highly beneficial in the above context. Varied attempts have been made by researchers to overcome challenges such as thin vessels, bifurcations and obstructive lesions in retinal vessel detection as revealed through several publications reviewed here. Revelations of diabetic neuropathic complications such as tortuosity, changes in the density and angles of the corneal fibers have been successfully sorted in many publications reviewed here. Since artifacts complicate the images and affect the quality of analysis, methods addressing these challenges have been described. Traditional and deep learning methods, that have been adapted and published between 2015 and 2021 covering retinal vessels, corneal nerves and filamentous fungi have been summarized in this review. We find several novel and meritorious ideas and techniques being put to use in the case of retinal vessel segmentation and classification, which by way of cross-domain adaptation can be utilized in the case of corneal and filamentous fungi also, making suitable adaptations to the challenges to be addressed.
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Affiliation(s)
- Rajitha Kv
- Department of Biomedical Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, 576104, Karnataka, India
| | - Keerthana Prasad
- Manipal School of Information Sciences, Manipal Academy of Higher Education, Manipal, 576104, Karnataka, India.
| | - Prakash Peralam Yegneswaran
- Department of Microbiology, Kasturba Medical College, Manipal Academy of Higher Education, Manipal, 576104, Karnataka, India
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16
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Paul P, Mahfoud ZR, Malik RA, Kaul R, Muffuh Navti P, Al-Sheikhly D, Chaari A. Knowledge, Awareness, and Attitude of Healthcare Stakeholders on Alzheimer's Disease and Dementia in Qatar. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:4535. [PMID: 36901551 PMCID: PMC10002196 DOI: 10.3390/ijerph20054535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 02/27/2023] [Accepted: 03/01/2023] [Indexed: 06/18/2023]
Abstract
Dementia is characterized by progressive cognitive decline, memory impairment, and disability. Alzheimer's disease (AD) accounts for 60-70% of cases, followed by vascular and mixed dementia. Qatar and the Middle East are at increased risk owing to aging populations and high prevalence of vascular risk factors. Appropriate levels of knowledge, attitudes, and awareness amongst health care professionals (HCPs) are the need of the hour, but literature indicates that these proficiencies may be inadequate, outdated, or markedly heterogenous. In addition to a review of published quantitative surveys investigating similar questions in the Middle East, a pilot cross-sectional online needs-assessment survey was undertaken to gauge these parameters of dementia and AD among healthcare stakeholders in Qatar between 19 April and 16 May 2022. Overall, 229 responses were recorded between physicians (21%), nurses (21%), and medical students (25%), with two-thirds from Qatar. Over half the respondents reported that >10% of their patients were elderly (>60 years). Over 25% reported having contact with >50 patients with dementia or neurodegenerative disease annually. Over 70% had not undertake related education/training in the last 2 years. The knowledge of HCPs regarding dementia and AD was moderate (mean score of 5.3 ± 1.5 out of 7) and their awareness of recent advances in basic disease pathophysiology was lacking. Differences existed across professions and location of respondents. Our findings lay the groundwork for a call-to-action for healthcare institutions to improve dementia care within Qatar and the Middle East region.
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Affiliation(s)
| | - Ziyad Riyad Mahfoud
- Division of Medical Education, Weill Cornell Medicine-Qatar, Doha 24144, Qatar
- Division of Epidemiology, Department of Population Health Sciences, Weill Cornell Medicine, NY 10065, New York, USA
| | - Rayaz A. Malik
- Division of Medicine, Weill Cornell Medicine-Qatar, Doha 24144, Qatar
- Division of Cardiovascular Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester M13 9NT, UK
- Faculty of Science and Engineering, Manchester Metropolitan University, Manchester M15 6BH, UK
| | | | - Phyllis Muffuh Navti
- Division of Continuing Professional Development, Weill Cornell Medicine-Qatar, Doha 24144, Qatar
| | - Deema Al-Sheikhly
- Division of Medical Education, Weill Cornell Medicine-Qatar, Doha 24144, Qatar
- Division of Continuing Professional Development, Weill Cornell Medicine-Qatar, Doha 24144, Qatar
| | - Ali Chaari
- Premedical Division, Weill Cornell Medicine-Qatar, Doha 24144, Qatar
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17
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Dai H, Zhang Y, Wu X, Li Y, Wang L, Li G. Corneal deposits and nerve alterations in Bietti Corneoretinal Crystalline Dystrophy imaged using in vivo confocal microscopy. Graefes Arch Clin Exp Ophthalmol 2023:10.1007/s00417-023-05987-5. [PMID: 36786828 DOI: 10.1007/s00417-023-05987-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 01/24/2023] [Accepted: 01/31/2023] [Indexed: 02/15/2023] Open
Abstract
PURPOSE To evaluate the imaging features of corneal deposits and nerve alterations in Chinese patients with Bietti Corneoretinal Crystalline Dystrophy (BCD) using in vivo confocal microscopy (IVCM). METHODS Twenty patients with BCD and 20 age- and sex-matched healthy controls were enrolled in this retrospective, observational study. Corneal deposits and sub-basal nerve plexus (SNP) were observed by IVCM. Parameters of SNP including total nerve density/number, main nerve trunk density/number, and branch nerve density/number were analyzed by Neuron J. RESULTS Corneal deposits were observed in both eyes of all patients by IVCM. These crystals appeared as dot-shaped, needle-shaped, and rod-shaped hyperreflective bodies and were located not only in the sub-epithelium and stroma of cornea, but in endothelium which were not reported before. There was a decrease of total nerve density (P < 0.001), main nerve trunk density (P = 0.007), and branch nerve density (P = 0.001), in BCD compared to controls. The number of total nerves/frame (P = 0.001), main nerve trunks/frame (P = 0.005), and branch nerves/frame (P = 0.006) in BCD were lower than controls. CONCLUSION New findings in locations of corneal crystals by IVCM expand the phenotype spectrum of BCD. Corneal deposits may be useful for diagnosis of BCD, especially ones without retinal deposits. Corneal nerve parameters were reduced in BCD, which may provide new insights to be further explored to contribute to our understanding of BCD. IVCM is a promising tool to evaluate corneal deposits and nerve alterations in BCD.
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Affiliation(s)
- Hehua Dai
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University,Beijing Ophthalmology & Visual Sciences Key Laboratory, Beijing, 100730, China
| | - Yang Zhang
- Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University,Beijing Ophthalmology & Visual Sciences Key Laboratory, 17 Hou Gou Lane, Chong Nei Street, Beijing, 100005, China
| | - Xingzhi Wu
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University,Beijing Ophthalmology & Visual Sciences Key Laboratory, Beijing, 100730, China
| | - Yuyu Li
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University,Beijing Ophthalmology & Visual Sciences Key Laboratory, Beijing, 100730, China
| | - Lianghai Wang
- Beijing Jiangong Hospital, No.6 Rufuli, Xicheng District, Beijing, 100054, China
| | - Genlin Li
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University,Beijing Ophthalmology & Visual Sciences Key Laboratory, Beijing, 100730, China.
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18
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Toprak M, Altintas O, Bickin H, Efendi H, Yilmaz Tugan B, Yuksel N. In vivo confocal microscopy of corneal nerve fiber damage in early course of multiple sclerosis. Int Ophthalmol 2023; 43:503-509. [PMID: 35945411 DOI: 10.1007/s10792-022-02448-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Accepted: 07/31/2022] [Indexed: 11/24/2022]
Abstract
PURPOSE To evaluate the corneal nerve fiber morphology in patients with multiple sclerosis (MS) by in vivo corneal confocal microscopy (CCM). METHODS Retinal nerve fiber layer thickness (RNFLT), central macular thickness (CMT), corneal nerve fiber length (CNFL), corneal nerve fiber density (CNFD), corneal nerve branch density (CNBD) and corneal nerve fiber tortuosity (CNFT) were measured. Correlation of corneal nerve findings with duration and clinical severity of MS was calculated. RESULTS CNFL (9.50 ± 0.60 vs. 11.20 ± 0.57 mm/mm2, P = 0.046) and CNBD (57.46 ± 5.04 vs. 77.65 ± 3.41 no/mm2, P = 0.001) were significantly lower with no significant difference in CNFD (21.24 ± 1.20 vs. 23.62 ± 0.95 no/mm2, P = 0.125), CNFT (2.00 ± 0.15 vs. 1.73 ± 0.12, P = 0.180), CMT (269.57 ± 12.53 vs. 271.10 ± 18.84 μm, P = 0.716) or RNFLT (102.82 ± 6.98 vs. 105.33 ± 12.70 μm, P = 0.351) between patients with RRMS compared to controls. There was no significant correlation between CCM parameters with EDSS and duration of disease in MS patients. CONCLUSION The current study demonstrated that a decrease in CNFL, CNFD and CNBD in CCM analysis in the early course of MS.
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Affiliation(s)
- Muge Toprak
- Ophthalmology Clinic, Gebze Fatih State Hospital, 41400, Kocaeli, Turkey.
| | - Ozgul Altintas
- Department of Ophthalmology, Acibadem Mehmet Ali Aydınlar University, 34398, Istanbul, Turkey
| | - Hande Bickin
- Neurology Clinic, Pasaalani Private Sevgi Hospital, 10100, Balıkesir, Turkey
| | - Husnu Efendi
- Department of Neurology, Kocaeli University, 41100, Kocaeli, Turkey
| | | | - Nursen Yuksel
- Department of Ophthalmology, Kocaeli University, 41100, Kocaeli, Turkey
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Dericioğlu V, Akkaya Turhan S, Erdem HE, Sevik MO, Erdil E, Sünter G, Ağan K, Toker E. In Vivo Corneal Confocal Microscopy in Multiple Sclerosis: Can it Differentiate Disease Relapse in Multiple Sclerosis? Am J Ophthalmol 2023; 250:138-148. [PMID: 36669610 DOI: 10.1016/j.ajo.2023.01.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 01/11/2023] [Accepted: 01/12/2023] [Indexed: 01/20/2023]
Abstract
PURPOSE This study aims to investigate the role of in vivo corneal confocal microscopy (IVCCM) in the detection of corneal inflammatory activity and subbasal nerve alterations in patients with multiple sclerosis (MS) and to further determine whether IVCCM can be used to detect (acute) disease relapse. DESIGN Prospective cross-sectional study, with a subgroup follow-up. METHODS This single-center study included 58 patients with MS (MS-Relapse group [n = 27] and MS-Remission group [n = 31]), and 30 age- and sex-matched healthy control subjects. Patients with a history of optic neuritis or trigeminal symptoms were excluded. Corneal nerve fiber density (CNFD), corneal nerve branch density (CNBD), corneal nerve fiber length (CNFL), and dendritic cell (DC) density were evaluated in all patients with MS and control subjects by IVCCM. Patients in the MS-Relapse group who were in remission for ≥6 months after the MS incident underwent a repeat IVCCM. RESULTS No statistical difference was observed between the MS-Relapse and MS-Remission groups regarding age, sex, MS duration, and the number of relapses (P > .05). Compared with healthy control subjects, all subbasal nerve parameters were significantly lower (CNFD: P < .001, CNFL: P < .001, CNBD: P < .001), and the DC density was significantly higher (P = .023) in patients with MS. However, no significant difference was observed between MS-Relapse and MS-Remission groups in terms of CNFD (mean [SE] difference -2.05 [1.69] fibers/mm2 [95% confidence interval {CI} -1.32 to 5.43]; P < .227), CNFL (mean [SE] difference -1.10 [0.83] mm/mm2 [95% CI -0.56 to 2.75]; P < .190), CNBD (mean [SE] difference -3.91 [2.48] branches/mm2 [95% CI -1.05 to 8.87]; P < .120), and DC density (median [IQR], 59.38 [43.75-85.0] vs 75.0 [31.25-128.75]; P = .596). The repeat IVCCM in relapse patients (n = 16 [59.3%]) showed a significant increase in CNFD (P = .036) and CNBD (P = .018), but no change was observed in CNFL (P = .075) and DC density (P = .469). CONCLUSION Although increased inflammation and neurodegeneration can be demonstrated in patients with MS compared with healthy control subjects, a single time point evaluation of IVCCM does not seem to be sufficient to confirm the occurrence of relapse in patients with MS. However, IVCCM holds promise for demonstrating early neuroregeneration in patients with MS.
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Affiliation(s)
- Volkan Dericioğlu
- From the Department of Ophthalmology (V.D., S.A.T., H.E.E., M.O.S.), Marmara University School of Medicine, Istanbul, Turkey.
| | - Semra Akkaya Turhan
- From the Department of Ophthalmology (V.D., S.A.T., H.E.E., M.O.S.), Marmara University School of Medicine, Istanbul, Turkey
| | - Halit Eren Erdem
- From the Department of Ophthalmology (V.D., S.A.T., H.E.E., M.O.S.), Marmara University School of Medicine, Istanbul, Turkey
| | - Mehmet Orkun Sevik
- From the Department of Ophthalmology (V.D., S.A.T., H.E.E., M.O.S.), Marmara University School of Medicine, Istanbul, Turkey
| | - Esra Erdil
- and the Department of Neurology (E.E., G.S., K.A.), Marmara University School of Medicine, Istanbul, Turkey
| | - Gülin Sünter
- and the Department of Neurology (E.E., G.S., K.A.), Marmara University School of Medicine, Istanbul, Turkey
| | - Kadriye Ağan
- and the Department of Neurology (E.E., G.S., K.A.), Marmara University School of Medicine, Istanbul, Turkey
| | - Ebru Toker
- and the Department of Ophthalmology and Visual Sciences (E.T.), West Virginia University, Morgantown, West Virginia, USA
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20
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Pacaud D, Romanchuk KG, Virtanen H, Ferdousi M, Nettel-Aguirre A, Mah JK, Tavakoli M, Zochodne DW, Malik RA. Corneal nerve and nerve conduction abnormalities in children with type 1 diabetes. Pediatr Diabetes 2022; 23:1665-1673. [PMID: 36131228 DOI: 10.1111/pedi.13419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Revised: 09/08/2022] [Accepted: 09/17/2022] [Indexed: 12/29/2022] Open
Abstract
OBJECTIVE In vivo corneal confocal microscopy (CCM) is a novel, rapid, and non-invasive technique that identifies early small fiber damage and can predict the progression and development of clinical neuropathy in adults with type 1 diabetes. However, its usefulness in children is not well established. This study compared corneal confocal microscopy with neuropathic symptoms, signs, and objective measures of neuropathy for the diagnosis of diabetic neuropathy in children with type 1 diabetes. RESEARCH DESIGN AND METHODS A total of 83 children with type 1 diabetes and 83 healthy participants of similar age underwent assessment of neuropathy symptoms, signs, nerve conduction studies, quantitative sensory and autonomic function testing, and in vivo CCM. RESULTS Only of 3/83 (4%) children with type 1 diabetes had subclinical neuropathy. However, corneal nerve fiber density (p = 0.001), branch density (p = 0.006), fiber length (p = 0.002), tibial motor nerve amplitude and conduction velocity, and sural sensory nerve amplitude and conduction velocity (all p < 0.004) were lower in participants with type 1 diabetes than in the controls. Vibration, cooling, and warm perception thresholds and deep breathing heart rate variability were not found to be different (all p > 0.05) between children with type 1 diabetes and healthy controls. Multivariate regression analysis identified a possible association between body mass index and decreased corneal nerves. CONCLUSIONS Decreased corneal nerves and abnormal nerve conduction were found in children with type 1 diabetes. CCM may allow rapid objective detection of subclinical diabetic neuropathy in children and adolescents with type 1 diabetes.
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Affiliation(s)
- Danièle Pacaud
- Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Pediatric Diabetes, Pediatric Neurology and Pediatric Ophthalmology divisions, Alberta Children's Hospital, Calgary, Alberta, Canada.,Alberta Children's Hospital Research Institute, Calgary, Alberta, Canada
| | - Kenneth G Romanchuk
- Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Pediatric Diabetes, Pediatric Neurology and Pediatric Ophthalmology divisions, Alberta Children's Hospital, Calgary, Alberta, Canada
| | - Heidi Virtanen
- Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Pediatric Diabetes, Pediatric Neurology and Pediatric Ophthalmology divisions, Alberta Children's Hospital, Calgary, Alberta, Canada.,Alberta Children's Hospital Research Institute, Calgary, Alberta, Canada
| | - Maryam Ferdousi
- Division of Cardiovascular Sciences, Cardiac Centre, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK.,NIHR/Wellcome Trust Clinical Research Facility, Manchester, UK
| | - Alberto Nettel-Aguirre
- Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Centre for Health and Social Analytics, NIASRA, University of Wollongong, Wollongong, New South Wales, Australia
| | - Jean K Mah
- Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Pediatric Diabetes, Pediatric Neurology and Pediatric Ophthalmology divisions, Alberta Children's Hospital, Calgary, Alberta, Canada.,Alberta Children's Hospital Research Institute, Calgary, Alberta, Canada
| | - Mitra Tavakoli
- Centre for Endocrinology and Diabetes, Institute of Human Development, University of Manchester, Manchester, UK.,Exeter Centre of Excellence for Diabetes Research, NIHR Exeter Clinical Research Facility, University of Exeter Medical School, Exeter, UK
| | - Douglas W Zochodne
- Division of Neurology, Department of Medicine and the Neuroscience and Mental Health Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Rayaz A Malik
- Division of Cardiovascular Sciences, Cardiac Centre, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK.,NIHR/Wellcome Trust Clinical Research Facility, Manchester, UK.,Department of Medicine, Weill Cornell Medicine-Qatar, Doha, Qatar
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21
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Li G, Li T, Li F, Zhang C. NerveStitcher: Corneal confocal microscope images stitching with neural networks. Comput Biol Med 2022; 151:106303. [PMID: 36435056 DOI: 10.1016/j.compbiomed.2022.106303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 11/03/2022] [Accepted: 11/06/2022] [Indexed: 11/11/2022]
Abstract
Corneal nerves are of great interest to clinicians and scientists due to their potential for the diagnosis of early neurological disorders. In vivo confocal microscopy (IVCM) has been used as a novel and reliable tool for observing and quantifying corneal sub-basal nerves. Creating a wide-field montage of the nerve plexus from a large amount of IVCM images facilitates the measurement of corneal nerve morphology. In this paper, we propose a fully automatic image stitching method using neural networks. Firstly, we extend a self-supervised point detector to find the feature points on IVCM images. Then a flexible points correspondence based on the attention mechanism is developed for partial assignment of image pair. The scattered IVCM images are consequently integrated and fused according to the local offsets. We experimented with our method on 30 sets of IVCM images. Compared to conventional methods, our method improves matching accuracy and significantly reduces processing time. And by calculating the morphological parameters of the corneal nerve for both single images and stitched images, our method can evaluate the corneal nerve of patients more accurately and reliably. The implemented code is available at https://github.com/LiTianYu6/NerveStitcher.
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Affiliation(s)
- Guangxu Li
- School of Electronics and Information Engineering, Tiangong University, Tianjin, China; Tianjin Optoelectronic Detection Technology and System Laboratory, Tianjin, China.
| | - Tianyu Li
- School of Electronics and Information Engineering, Tiangong University, Tianjin, China.
| | - Fangting Li
- Department of Ophthalmology, Peking University People's Hospital, Beijing, China
| | - Chen Zhang
- Eye Institute and School of Optometry, Tianjin Medical University Eye Hospital, Tianjin, China; Tianjin Branch of National Clinical Research Center for Ocular Disease, Tianjin, China; Tianjin Key Laboratory of Retinal Functions and Diseases, Tianjin, China
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22
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Matuszewska-Iwanicka A, Stratmann B, Stachs O, Allgeier S, Bartschat A, Winter K, Guthoff R, Tschoepe D, Hettlich HJ. Mosaic vs. Single Image Analysis with Confocal Microscopy of the Corneal Nerve Plexus for Diagnosis of Early Diabetic Peripheral Neuropathy. Ophthalmol Ther 2022; 11:2211-2223. [PMID: 36184730 DOI: 10.1007/s40123-022-00574-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Accepted: 09/09/2022] [Indexed: 11/26/2022] Open
Abstract
INTRODUCTION The assessment of the corneal nerve fibre plexus with corneal confocal microscopy (CCM) is an upcoming but still experimental method in the diagnosis of early stage diabetic peripheral neuropathy (DPN). Using an innovative imaging technique-Heidelberg Retina Tomograph equipped with the Rostock Cornea Module (HRT-RCM) and EyeGuidance module (EG)-we were able to look at greater areas of subbasal nerve plexus (SNP) in order to increase the diagnostic accuracy. The aim of our study was to evaluate the usefulness of EG instead of single image analysis in diagnosis of early stage DPN. METHODS This prospective study was performed on 60 patients with type 2 diabetes mellitus, classified equally into two subgroups based on neuropathy deficient score (NDS): patients without DPN (group 1) or with mild DPN (group 2). The following parameters were analysed in the two subgroups: corneal nerve fibre length (CNFL; mm/mm2), corneal nerve fibre density (CNFD; no./mm2), corneal nerve branch density (CNBD; no./mm2). Furthermore, we compared the data calculated with the novel mosaic, EG-based method with those received from single image analysis using different quantification tools. RESULTS Using EG we did not find a significant difference between group 1 and group 2: CNFL (16.81 ± 5.87 mm/mm2 vs. 17.19 ± 7.19 mm/mm2, p = 0.895), CNFD (254.05 ± 115.36 no./mm2 vs. 265.91 ± 161.63 no./mm2, p = 0.732) and CNBD (102.68 ± 62.28 no./mm2 vs. 115.38 ± 96.91 no./mm2, p = 0.541). No significant difference between the EG method of analysing the SNP and the single image analysis of 10 images per patient was detected. CONCLUSION On the basis of our results it was not possible to differentiate between early stages of large nerve fibre DPN in patients with type 2 diabetes mellitus via SNP analysis. To improve sensitivity and specificity of this method newer technologies are under current evaluation. TRIAL REGISTRATION ClinicalTrials.gov Identifier NCT05326958.
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Affiliation(s)
- Aleksandra Matuszewska-Iwanicka
- Eye Clinic Johannes Wesling Hospital, Ruhr Universität Bochum, Augen-Praxisklinik Minden, Königstraße 120, 32427, Minden, Germany.
| | - Bernd Stratmann
- Herz- und Diabeteszentrum NRW, Diabeteszentrum, Ruhr Universität Bochum, Bad Oeynhausen, Germany
| | - Oliver Stachs
- Department of Ophthalmology, Rostock University Medical Center, Rostock, Germany
| | - Stephan Allgeier
- Institute for Automation and Applied Informatics, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
| | - Andreas Bartschat
- Institute for Automation and Applied Informatics, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
| | - Karsten Winter
- Institute of Anatomy, University of Leipzig, Leipzig, Germany
| | - Rudolf Guthoff
- Department of Ophthalmology, Rostock University Medical Center, Rostock, Germany
| | - Diethelm Tschoepe
- Herz- und Diabeteszentrum NRW, Diabeteszentrum, Ruhr Universität Bochum, Bad Oeynhausen, Germany
- Stiftung DHD (Der herzkranke Diabetiker) Stiftung in der Deutschen Diabetes-Stiftung, Bad Oeynhausen, Germany
| | - Hans-Joachim Hettlich
- Eye Clinic Johannes Wesling Hospital, Ruhr Universität Bochum, Augen-Praxisklinik Minden, Königstraße 120, 32427, Minden, Germany
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23
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Chiang JCB, Khou V, Tavakoli A, Park SB, Goldstein D, Krishnan AV, Markoulli M. Reproducibility and Reliability of Subbasal Corneal Nerve Parameters of the Inferior Whorl in the Neurotoxic and Healthy Cornea. Cornea 2022; 41:1487-1494. [PMID: 36155558 DOI: 10.1097/ico.0000000000002947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 10/14/2021] [Indexed: 11/25/2022]
Abstract
PURPOSE The aim of this study was to investigate the reliability of subbasal corneal nerve plexus parameters of the inferior whorl compared with the central cornea with in vivo corneal confocal microscopy and to investigate the impact of inferior whorl pattern complexity on reproducibility. METHODS Subbasal corneal nerves of healthy controls (n = 10) and patients with chemotherapy-induced peripheral neuropathy (n = 10) were imaged with a laser scanning confocal microscope. Two masked, experienced observers and the original image taker were tasked with selecting representative images of the central cornea and inferior whorl for each participant. This was conducted on 2 occasions 1 week apart. Corneal nerve fiber length (CNFL) and fractal dimension (CNFrD) [central cornea: CNFL and CNFrD; inferior whorl region: inferior whorl length (IWL) and inferior whorl fractal dimension (IWFrD)] were analyzed. Intraclass correlation coefficient (ICC) was analyzed for interobserver and intraobserver reliability. Inferior whorl complexity was classified according to the ease of identification of the center point of convergence. RESULTS Interobserver ICC was 0.992 for CNFL, 0.994 for CNFrD, 0.980 for IWL, and 0.954 for IWFrD. When analyzed by inferior whorl complexity, the interobserver reliability was similar for simple (0.987 for IWL; 0.960 for IWFrD) and complex patterns (0.967 for IWL; 0.949 for IWFrD). However, intraobserver ICC were reduced for complex (IWL 0.841-0.970; IWFrD 0.830-0.955) compared with simple patterns (IWL 0.931-0.970; IWFrD 0.921-0.969). CONCLUSIONS Although the overall interobserver reliability was excellent for the central corneal and inferior whorl parameters, there was lower intraobserver reliability for the inferior whorl parameters for complex morphological patterns. To improve reliability, more sophisticated wide-field imaging of the inferior whorl may be needed.
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Affiliation(s)
- Jeremy Chung Bo Chiang
- Faculty of Medicine and Health, School of Optometry and Vision Science, University of New South Wales, Sydney, Australia
| | - Vincent Khou
- Faculty of Medicine and Health, School of Optometry and Vision Science, University of New South Wales, Sydney, Australia.,Centre for Eye Health, University of New South Wales, Sydney, Australia
| | - Azadeh Tavakoli
- Faculty of Medicine and Health, School of Optometry and Vision Science, University of New South Wales, Sydney, Australia
| | - Susanna B Park
- Faculty of Medicine and Health, Brain and Mind Centre, University of Sydney, Sydney, Australia
| | - David Goldstein
- Prince of Wales Clinical School, University of New South Wales, Sydney, Australia; and.,Department of Medical Oncology, Prince of Wales Hospital, Sydney, Australia
| | - Arun V Krishnan
- Prince of Wales Clinical School, University of New South Wales, Sydney, Australia; and
| | - Maria Markoulli
- Faculty of Medicine and Health, School of Optometry and Vision Science, University of New South Wales, Sydney, Australia
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24
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Malik RA. Corneal confocal microscopy meets continuous glucose monitoring: a tale of two technologies. Chin Med J (Engl) 2022; 135:1891-1893. [PMID: 36148585 PMCID: PMC9746738 DOI: 10.1097/cm9.0000000000002254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Indexed: 01/26/2023] Open
Affiliation(s)
- Rayaz A. Malik
- Weill Cornell Medicine-Qatar, Qatar Foundation, Education City, Doha, Qatar
- Institute of Cardiovascular Science, University of Manchester, Manchester, UK
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25
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Malik RA. Corneal confocal microscopy for the assessment of diabetic neuropathy and beyond in Brazil. ARQUIVOS DE NEURO-PSIQUIATRIA 2022; 80:767-769. [PMID: 36252583 PMCID: PMC9703882 DOI: 10.1055/s-0042-1756169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Rayaz A. Malik
- Weill Cornell Medicine-Qatar, Education City, Qatar Foundation, Doha, Qatar
- University of Manchester, Division of Cardiovascular Sciences, Manchester, United Kingdom
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26
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Neuroimmune crosstalk in the cornea: The role of immune cells in corneal nerve maintenance during homeostasis and inflammation. Prog Retin Eye Res 2022; 91:101105. [PMID: 35868985 DOI: 10.1016/j.preteyeres.2022.101105] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 07/01/2022] [Accepted: 07/04/2022] [Indexed: 12/29/2022]
Abstract
In the cornea, resident immune cells are in close proximity to sensory nerves, consistent with their important roles in the maintenance of nerves in both homeostasis and inflammation. Using in vivo confocal microscopy in humans, and ex vivo immunostaining and fluorescent reporter mice to visualize corneal sensory nerves and immune cells, remarkable progress has been made to advance our understanding of the physical and functional interactions between corneal nerves and immune cells. In this review, we summarize and discuss recent studies relating to corneal immune cells and sensory nerves, and their interactions in health and disease. In particular, we consider how disrupted corneal nerve axons can induce immune cell activity, including in dendritic cells, macrophages and other infiltrating cells, directly and/or indirectly by releasing neuropeptides such as substance P and calcitonin gene-related peptide. We summarize growing evidence that the role of corneal intraepithelial immune cells is likely different in corneal wound healing versus other inflammatory-dominated conditions. The role of different types of macrophages is also discussed, including how stromal macrophages with anti-inflammatory phenotypes communicate with corneal nerves to provide neuroprotection, while macrophages with pro-inflammatory phenotypes, along with other infiltrating cells including neutrophils and CD4+ T cells, can be inhibitory to corneal re-innervation. Finally, this review considers the bidirectional interactions between corneal immune cells and corneal nerves, and how leveraging this interaction could represent a potential therapeutic approach for corneal neuropathy.
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27
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Prevalence and predictors of neurological manifestations in systemic AL amyloidosis. J Neurol Sci 2022; 440:120341. [PMID: 35872471 DOI: 10.1016/j.jns.2022.120341] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 06/03/2022] [Accepted: 07/12/2022] [Indexed: 11/21/2022]
Abstract
INTRODUCTION Immunoglobulin light chain (AL) amyloidosis is a life-threatening systemic disease due to plasma cell dyscrasias, which is characterized by amyloid deposition in various tissues. Neurological manifestations, in particular peripheral nervous system involvement, play a major role for quality of life and treatment decisions as frequently potentially neurotoxic drugs are used. METHODS We retrospectively investigated the prevalence of neurological manifestations, its risk factors and prognostic value in 155 consecutive patients with AL amyloidosis in a single German tertiary center between 2010 and 2021. Multiple logistic regression was performed to identify predictors of amyloid neuropathy and the impact of peripheral neuropathy on patient survival was assessed by Cox proportional hazard regression analysis. RESULTS Nearly half of patients showed at least one of four neurological manifestations of AL amyloidosis which were frequent in our study: peripheral neuropathy (36.8%), carpal tunnel syndrome (12.9%), lumbar spinal stenosis (7.1%), and amyloid myopathy (3.9%). Male sex (OR 2.943, CI 1.152-8.139, p = 0.029) and cardiac involvement (OR 6.186, CI 1.449-43.38, p = 0.028) were independent predictors of peripheral neuropathy which was closely related to autonomic dysfunction in patients with AL amyloidosis. Peripheral neuropathy had no impact on survival (HR 0.952, CI 0.517-1.754, p = 0.876). CONCLUSIONS Neurological involvement is common in systemic AL amyloidosis. Treatment decisions should take into account peripheral neuropathy, in particular in male patients with amyloid cardiomyopathy, but also amyloid myopathy that seems to be not as rare as previously suggested.
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28
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Sesma G, Ahmad K, AlBakri A, Awad A, Malik R. Incidence and outcomes of microbial keratitis after cyclophotocoagulation to treat childhood refractory glaucoma. J AAPOS 2022; 26:124.e1-124.e5. [PMID: 35525386 DOI: 10.1016/j.jaapos.2022.01.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 12/28/2021] [Accepted: 01/02/2022] [Indexed: 10/18/2022]
Abstract
PURPOSE To report the incidence and outcomes of microbial keratitis (MK) following cyclophotocoagulation (CPC) for treatment of refractory childhood glaucoma (CG) at a single center over a period of 6 years. METHODS In this cohort study, the medical records of children with CG who underwent CPC and subsequently presented with MK from 2014 to 2020 were reviewed retrospectively. Data were collected on age, type of glaucoma, surgeries before MK, CPC parameters, interval between CPC and MK, presenting symptoms of MK, infiltrate location, bacterial isolates, MK treatment, and outcomes. RESULTS Among the 312 children who underwent CPC during the study period, 37 eyes of 33 children had MK, with an incidence of 1.8% (95% CI, 0.3-3.2). The median interval between CPC and MK was 4 years (IQR, 2.7-7.4). CPC was repeated once in 20 eyes (54%) and twice in 4 (11%). In 20 eyes, there was no pain at MK onset. The primary isolates were Streptococcus pneumoniae (12/27 [22%]) and Staphylococcus epidermis (8/27 [30%]). MK resolved in 17 eyes (46%) after treatment; 8 eyes (22%) underwent evisceration or had phthisis, and keratoplasty failed in 6 eyes (16%). The absence of pain at presentation with MK was negatively associated with resolution (OR = 5.0 [95% CI, 1.1-23.8]; P = 0.04). CONCLUSIONS The absence of pain at MK onset may be a proxy for neurotrophic keratitis after CPC and is linked to poor response to management.
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Affiliation(s)
- Gorka Sesma
- Pediatric Ophthalmology Division, King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia.
| | - Khabir Ahmad
- Research Department, King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia
| | - Amani AlBakri
- Pediatric Ophthalmology Division, King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia
| | - Abdulaziz Awad
- Pediatric Ophthalmology Division, King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia
| | - Rizwan Malik
- Glaucoma Division, King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia; University of Alberta, Edmonton, Alberta, Canada
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29
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Setu MAK, Schmidt S, Musial G, Stern ME, Steven P. Segmentation and Evaluation of Corneal Nerves and Dendritic Cells From In Vivo Confocal Microscopy Images Using Deep Learning. Transl Vis Sci Technol 2022; 11:24. [PMID: 35762938 PMCID: PMC9251793 DOI: 10.1167/tvst.11.6.24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Purpose Segmentation and evaluation of in vivo confocal microscopy (IVCM) images requires manual intervention, which is time consuming, laborious, and non-reproducible. The aim of this research was to develop and validate deep learning–based methods that could automatically segment and evaluate corneal nerve fibers (CNFs) and dendritic cells (DCs) in IVCM images, thereby reducing processing time to analyze larger volumes of clinical images. Methods CNF and DC segmentation models were developed based on U-Net and Mask R-CNN architectures, respectively; 10-fold cross-validation was used to evaluate both models. The CNF model was trained and tested using 1097 and 122 images, and the DC model was trained and tested using 679 and 75 images, respectively, at each fold. The CNF morphology, number of nerves, number of branching points, nerve length, and tortuosity were analyzed; for DCs, number, size, and immature–mature cells were analyzed. Python-based software was written for model training, testing, and automatic morphometric parameters evaluation. Results The CNF model achieved on average 86.1% sensitivity and 90.1% specificity, and the DC model achieved on average 89.37% precision, 94.43% recall, and 91.83% F1 score. The interclass correlation coefficient (ICC) between manual annotation and automatic segmentation were 0.85, 0.87, 0.95, and 0.88 for CNF number, length, branching points, and tortuosity, respectively, and the ICC for DC number and size were 0.95 and 0.92, respectively. Conclusions Our proposed methods demonstrated reliable consistency between manual annotation and automatic segmentation of CNF and DC with rapid speed. The results showed that these approaches have the potential to be implemented into clinical practice in IVCM images. Translational Relevance The deep learning–based automatic segmentation and quantification algorithm significantly increases the efficiency of evaluating IVCM images, thereby supporting and potentially improving the diagnosis and treatment of ocular surface disease associated with corneal nerves and dendritic cells.
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Affiliation(s)
- Md Asif Khan Setu
- Department of Ophthalmology, Medical Faculty and University Hospital, University of Cologne, Cologne, Germany.,Division of Dry Eye and Ocular GvHD, University Hospital Cologne, University of Cologne, Cologne, Germany
| | | | - Gwen Musial
- Department of Ophthalmology, Medical Faculty and University Hospital, University of Cologne, Cologne, Germany.,Division of Dry Eye and Ocular GvHD, University Hospital Cologne, University of Cologne, Cologne, Germany
| | - Michael E Stern
- Department of Ophthalmology, Medical Faculty and University Hospital, University of Cologne, Cologne, Germany.,Division of Dry Eye and Ocular GvHD, University Hospital Cologne, University of Cologne, Cologne, Germany.,ImmunEyez LLC, Irvine, CA, USA
| | - Philipp Steven
- Department of Ophthalmology, Medical Faculty and University Hospital, University of Cologne, Cologne, Germany.,Division of Dry Eye and Ocular GvHD, University Hospital Cologne, University of Cologne, Cologne, Germany.,Cluster of Excellence: Cellular Stress Response in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
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30
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Thimm A, Carpinteiro A, Oubari S, Papathanasiou M, Kessler L, Rischpler C, Malik RA, Reinhardt HC, Rassaf T, Herrmann K, Kleinschnitz C, Stettner M, Hagenacker T. Corneal confocal microscopy to detect early immune-mediated small nerve fibre loss in AL amyloidosis. Ann Clin Transl Neurol 2022; 9:853-863. [PMID: 35488792 PMCID: PMC9186132 DOI: 10.1002/acn3.51565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 04/11/2022] [Accepted: 04/11/2022] [Indexed: 12/02/2022] Open
Abstract
Objective Light chain (AL) amyloidosis is a life‐threatening disorder characterised by extracellular deposition of amyloid leading to dysfunction of multiple organs. Peripheral nerve involvement, particularly small fibre neuropathy, may be associated with poorer survival. Corneal confocal microscopy (CCM) is a rapid and non‐invasive imaging technique to quantify corneal small nerve fibres and immune cells in vivo. We aimed to evaluate CCM as a tool for early diagnosis of peripheral nerve involvement in AL amyloidosis. Methods CCM and nerve conduction studies (NCS) were undertaken in 21 newly diagnosed, treatment‐naïve AL amyloidosis patients and 21 age‐ and sex‐matched healthy controls. Corneal nerve fibre density (CNFD), corneal nerve branch density and fibre length, and cell infiltrates were quantified in the sub‐basal layer of the cornea. Results There was a significant reduction in CNFD and nerve fibre length, even without large fibre affection and an increase in cell density, particularly around corneal nerve fibres in patients with AL amyloidosis compared to controls. Additionally, cell infiltration correlated with reduced nerve fibre density in patients with AL amyloidosis, but reduced CNFD did not correlate with laboratory parameters of organ dysfunction. Interpretation Our study is the first to show that CCM allows rapid non‐invasive identification of early small nerve fibre damage associated with immune cell infiltration in patients with AL amyloidosis. CCM detects peripheral nerve involvement more sensitively than NCS.
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Affiliation(s)
- Andreas Thimm
- Department of Neurology and Center for Translational Neuro- and Behavioral Sciences (C-TNBS), University Hospital Essen, Essen, Germany
| | - Alexander Carpinteiro
- Department of Hematology and Stem Cell Transplantation, University Hospital Essen, Essen, Germany.,Institute of Molecular Biology, University of Duisburg-Essen, Essen, Germany
| | - Sara Oubari
- Department of Hematology and Stem Cell Transplantation, University Hospital Essen, Essen, Germany
| | - Maria Papathanasiou
- Department of Cardiology and Vascular Medicine, West German Heart and Vascular Center, University Hospital Essen, Essen, Germany
| | - Lukas Kessler
- Department of Nuclear Medicine, University Hospital Essen, Essen, Germany
| | | | - Rayaz Ahmed Malik
- Institute of Cardiovascular Science, Faculty of Medical and Human Sciences, University of Manchester, Manchester, UK.,Weill Cornell Medicine-Qatar, Education City, Doha, Qatar
| | - Hans Christian Reinhardt
- Department of Hematology and Stem Cell Transplantation, University Hospital Essen, Essen, Germany
| | - Tienush Rassaf
- Department of Cardiology and Vascular Medicine, West German Heart and Vascular Center, University Hospital Essen, Essen, Germany
| | - Ken Herrmann
- Department of Nuclear Medicine, University Hospital Essen, Essen, Germany
| | - Christoph Kleinschnitz
- Department of Neurology and Center for Translational Neuro- and Behavioral Sciences (C-TNBS), University Hospital Essen, Essen, Germany
| | - Mark Stettner
- Department of Neurology and Center for Translational Neuro- and Behavioral Sciences (C-TNBS), University Hospital Essen, Essen, Germany
| | - Tim Hagenacker
- Department of Neurology and Center for Translational Neuro- and Behavioral Sciences (C-TNBS), University Hospital Essen, Essen, Germany
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31
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Jolivalt CG, Han MM, Nguyen A, Desmond F, Alves Jesus CH, Vasconselos DC, Pedneault A, Sandlin N, Dunne-Cerami S, Frizzi KE, Calcutt NA. Using Corneal Confocal Microscopy to Identify Therapeutic Agents for Diabetic Neuropathy. J Clin Med 2022; 11:jcm11092307. [PMID: 35566433 PMCID: PMC9104226 DOI: 10.3390/jcm11092307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 04/19/2022] [Accepted: 04/19/2022] [Indexed: 02/04/2023] Open
Abstract
Corneal confocal microscopy (CCM) is emerging as a tool for identifying small fiber neuropathy in both peripheral neuropathies and neurodegenerative disease of the central nervous system (CNS). The value of corneal nerves as biomarkers for efficacy of clinical interventions against small fiber neuropathy and neurodegenerative disease is less clear but may be supported by preclinical studies of investigational agents. We, therefore, used diverse investigational agents to assess concordance of efficacy against corneal nerve loss and peripheral neuropathy in a mouse model of diabetes. Ocular delivery of the peptides ciliary neurotrophic factor (CNTF) or the glucagon-like peptide (GLP) analog exendin-4, both of which prevent diabetic neuropathy when given systemically, restored corneal nerve density within 2 weeks. Similarly, ocular delivery of the muscarinic receptor antagonist cyclopentolate protected corneal nerve density while concurrently reversing indices of systemic peripheral neuropathy. Conversely, systemic delivery of the muscarinic antagonist glycopyrrolate, but not gallamine, prevented multiple indices of systemic peripheral neuropathy and concurrently protected against corneal nerve loss. These data highlight the potential for use of corneal nerve quantification by confocal microscopy as a bridging assay between in vitro and whole animal assays in drug development programs for neuroprotectants and support its use as a biomarker of efficacy against peripheral neuropathy.
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32
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Ponirakis G, Hamad HA, Khan A, Petropoulos IN, Gad H, Chandran M, Elsotouhy A, Ramadan M, Gawhale PV, Elorrabi M, Gadelseed M, Tosino R, Arasn A, Manikoth P, Abdelrahim YH, Refaee MA, Thodi N, Vattoth S, Almuhannadi H, Mahfoud ZR, Bhat H, Own A, Shuaib A, Malik RA. Loss of corneal nerves and brain volume in mild cognitive impairment and dementia. ALZHEIMER'S & DEMENTIA (NEW YORK, N. Y.) 2022; 8:e12269. [PMID: 35415208 PMCID: PMC8983001 DOI: 10.1002/trc2.12269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/18/2021] [Revised: 12/20/2021] [Accepted: 01/20/2022] [Indexed: 11/11/2022]
Abstract
Introduction This study compared the capability of corneal confocal microscopy (CCM) with magnetic resonance imaging (MRI) brain volumetry for the diagnosis of mild cognitive impairment (MCI) and dementia. Methods In this cross-sectional study, participants with no cognitive impairment (NCI), MCI, and dementia underwent assessment of Montreal Cognitive Assessment (MoCA), MRI brain volumetry, and CCM. Results Two hundred eight participants with NCI (n = 42), MCI (n = 98), and dementia (n = 68) of comparable age and gender were studied. For MCI, the area under the curve (AUC) of CCM (76% to 81%), was higher than brain volumetry (52% to 70%). For dementia, the AUC of CCM (77% to 85%), was comparable to brain volumetry (69% to 93%). Corneal nerve fiber density, length, branch density, whole brain, hippocampus, cortical gray matter, thalamus, amygdala, and ventricle volumes were associated with cognitive impairment after adjustment for confounders (All P's < .01). Discussion The diagnostic capability of CCM compared to brain volumetry is higher for identifying MCI and comparable for dementia, and abnormalities in both modalities are associated with cognitive impairment.
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Affiliation(s)
- Georgios Ponirakis
- Department of MedicineWeill Cornell Medicine‐QatarQatar FoundationDohaQatar
| | - Hanadi Al Hamad
- Geriatric & Memory ClinicRumailah HospitalHamad Medical CorporationDohaQatar
| | - Adnan Khan
- Department of MedicineWeill Cornell Medicine‐QatarQatar FoundationDohaQatar
| | | | - Hoda Gad
- Department of MedicineWeill Cornell Medicine‐QatarQatar FoundationDohaQatar
| | - Mani Chandran
- Geriatric & Memory ClinicRumailah HospitalHamad Medical CorporationDohaQatar
| | - Ahmed Elsotouhy
- Department of MedicineWeill Cornell Medicine‐QatarQatar FoundationDohaQatar
- NeuroradiologyHamad General HospitalHamad Medical CorporationDohaQatar
| | - Marwan Ramadan
- Geriatric & Memory ClinicRumailah HospitalHamad Medical CorporationDohaQatar
| | - Priya V. Gawhale
- Geriatric & Memory ClinicRumailah HospitalHamad Medical CorporationDohaQatar
| | - Marwa Elorrabi
- Geriatric & Memory ClinicRumailah HospitalHamad Medical CorporationDohaQatar
| | - Masharig Gadelseed
- Geriatric & Memory ClinicRumailah HospitalHamad Medical CorporationDohaQatar
| | - Rhia Tosino
- Geriatric & Memory ClinicRumailah HospitalHamad Medical CorporationDohaQatar
| | - Anjum Arasn
- Geriatric & Memory ClinicRumailah HospitalHamad Medical CorporationDohaQatar
| | - Pravija Manikoth
- Geriatric & Memory ClinicRumailah HospitalHamad Medical CorporationDohaQatar
| | | | - Mahmoud A Refaee
- Geriatric & Memory ClinicRumailah HospitalHamad Medical CorporationDohaQatar
| | - Noushad Thodi
- MRI UnitRumailah HospitalHamad Medical CorporationDohaQatar
| | - Surjith Vattoth
- RadiologyUniversity of Arkansas for Medical SciencesArkansasUSA
| | - Hamad Almuhannadi
- Department of MedicineWeill Cornell Medicine‐QatarQatar FoundationDohaQatar
| | - Ziyad R. Mahfoud
- Department of MedicineWeill Cornell Medicine‐QatarQatar FoundationDohaQatar
| | - Harun Bhat
- Department of MedicineWeill Cornell Medicine‐QatarQatar FoundationDohaQatar
| | - Ahmed Own
- NeuroradiologyHamad General HospitalHamad Medical CorporationDohaQatar
| | - Ashfaq Shuaib
- Department of MedicineUniversity of AlbertaAlbertaCanada
| | - Rayaz A. Malik
- Department of MedicineWeill Cornell Medicine‐QatarQatar FoundationDohaQatar
- Faculty of BiologyMedicine and HealthUniversity of ManchesterManchesterUK
- Faculty of Science and EngineeringManchester Metropolitan UniversityManchesterUK
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Petropoulos IN, Bitirgen G, Ferdousi M, Kalteniece A, Azmi S, D'Onofrio L, Lim SH, Ponirakis G, Khan A, Gad H, Mohammed I, Mohammadi YE, Malik A, Gosal D, Kobylecki C, Silverdale M, Soran H, Alam U, Malik RA. Corneal Confocal Microscopy to Image Small Nerve Fiber Degeneration: Ophthalmology Meets Neurology. FRONTIERS IN PAIN RESEARCH 2022; 2:725363. [PMID: 35295436 PMCID: PMC8915697 DOI: 10.3389/fpain.2021.725363] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Accepted: 07/26/2021] [Indexed: 12/13/2022] Open
Abstract
Neuropathic pain has multiple etiologies, but a major feature is small fiber dysfunction or damage. Corneal confocal microscopy (CCM) is a rapid non-invasive ophthalmic imaging technique that can image small nerve fibers in the cornea and has been utilized to show small nerve fiber loss in patients with diabetic and other neuropathies. CCM has comparable diagnostic utility to intraepidermal nerve fiber density for diabetic neuropathy, fibromyalgia and amyloid neuropathy and predicts the development of diabetic neuropathy. Moreover, in clinical intervention trials of patients with diabetic and sarcoid neuropathy, corneal nerve regeneration occurs early and precedes an improvement in symptoms and neurophysiology. Corneal nerve fiber loss also occurs and is associated with disease progression in multiple sclerosis, Parkinson's disease and dementia. We conclude that corneal confocal microscopy has good diagnostic and prognostic capability and fulfills the FDA criteria as a surrogate end point for clinical trials in peripheral and central neurodegenerative diseases.
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Affiliation(s)
| | - Gulfidan Bitirgen
- Department of Ophthalmology, Meram Faculty of Medicine, Necmettin Erbakan University, Konya, Turkey
| | - Maryam Ferdousi
- Faculty of Biology, Medicine and Health, University of Manchester, Cardiovascular Trials Unit, Manchester University NHS Foundation Trust, Manchester, United Kingdom
| | - Alise Kalteniece
- Faculty of Biology, Medicine and Health, University of Manchester, Cardiovascular Trials Unit, Manchester University NHS Foundation Trust, Manchester, United Kingdom
| | - Shazli Azmi
- Faculty of Biology, Medicine and Health, University of Manchester, Cardiovascular Trials Unit, Manchester University NHS Foundation Trust, Manchester, United Kingdom.,Centre for Diabetes, Endocrinology and Metabolism, Manchester University NHS Foundation Trust, Manchester, United Kingdom
| | - Luca D'Onofrio
- Department of Experimental Medicine, Sapienza University, Rome, Italy
| | - Sze Hway Lim
- Department of Neurology, Salford Royal National Health System (NHS) Foundation Trust, Manchester Academic Health Sciences Centre, University of Manchester, Manchester, United Kingdom
| | | | - Adnan Khan
- Department of Medicine, Weill Cornell Medicine-Qatar, Doha, Qatar
| | - Hoda Gad
- Department of Medicine, Weill Cornell Medicine-Qatar, Doha, Qatar
| | - Ibrahim Mohammed
- Department of Medicine, Weill Cornell Medicine-Qatar, Doha, Qatar
| | | | - Ayesha Malik
- Department of Medicine, Weill Cornell Medicine-Qatar, Doha, Qatar
| | - David Gosal
- Department of Neurology, Salford Royal National Health System (NHS) Foundation Trust, Manchester Academic Health Sciences Centre, University of Manchester, Manchester, United Kingdom
| | - Christopher Kobylecki
- Department of Neurology, Salford Royal National Health System (NHS) Foundation Trust, Manchester Academic Health Sciences Centre, University of Manchester, Manchester, United Kingdom
| | - Monty Silverdale
- Department of Neurology, Salford Royal National Health System (NHS) Foundation Trust, Manchester Academic Health Sciences Centre, University of Manchester, Manchester, United Kingdom
| | - Handrean Soran
- Faculty of Biology, Medicine and Health, University of Manchester, Cardiovascular Trials Unit, Manchester University NHS Foundation Trust, Manchester, United Kingdom
| | - Uazman Alam
- Department of Cardiovascular and Metabolic Medicine, Clinical Sciences Centre, Pain Research Institute, Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool University Hospital National Health System (NHS) Foundation Trust, Liverpool, United Kingdom
| | - Rayaz A Malik
- Department of Medicine, Weill Cornell Medicine-Qatar, Doha, Qatar.,Faculty of Biology, Medicine and Health, University of Manchester, Cardiovascular Trials Unit, Manchester University NHS Foundation Trust, Manchester, United Kingdom
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Al-Bazz DY, Nelson AJ, Burgess J, Petropoulos IN, Nizza J, Marshall A, Brown E, Cuthbertson DJ, Marshall AG, Malik RA, Alam U. Is Nerve Electrophysiology a Robust Primary Endpoint in Clinical Trials of Treatments for Diabetic Peripheral Neuropathy? Diagnostics (Basel) 2022; 12:731. [PMID: 35328284 PMCID: PMC8947384 DOI: 10.3390/diagnostics12030731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 03/10/2022] [Accepted: 03/11/2022] [Indexed: 12/10/2022] Open
Abstract
There is currently no FDA-approved disease-modifying therapy for diabetic peripheral neuropathy (DPN). Nerve conduction velocity (NCV) is an established primary endpoint of disease-modifying therapies in DPN and clinical trials have been powered with an assumed decline of 0.5 m/s/year. This paper sought to establish the time-dependent change in NCV associated with a placebo, compared to that observed in the active intervention group. A literature search identified twenty-one double-blind, randomised controlled trials in DPN of ≥1 year duration conducted between 1971 and 2021. We evaluated changes in neurophysiology, with a focus on peroneal motor and sural sensory NCV and amplitude in the placebo and treatment groups. There was significant variability in the change and direction of change (reduction/increase) in NCV in the placebo arm, as well as variability influenced by the anatomical site of neurophysiological measurement within a given clinical trial. A critical re-evaluation of efficacy trials should consider placebo-adjusted effects and present the placebo-subtracted change in NCV rather than assume a universal annual decline of 0.5 m/s/year. Importantly, endpoints such as corneal confocal microscopy (CCM) have demonstrated early nerve repair, whilst symptoms and NCV have not changed, and should thus be considered as a viable alternative.
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Affiliation(s)
- Dalal Y. Al-Bazz
- Institute of Life Course and Medical Sciences and the Pain Research Institute, University of Liverpool and Liverpool University Hospital NHS Foundation Trust, Liverpool L9 7AL, UK; (A.J.N.); (J.B.); (J.N.); (A.M.); (A.G.M.)
| | - Andrew J. Nelson
- Institute of Life Course and Medical Sciences and the Pain Research Institute, University of Liverpool and Liverpool University Hospital NHS Foundation Trust, Liverpool L9 7AL, UK; (A.J.N.); (J.B.); (J.N.); (A.M.); (A.G.M.)
| | - Jamie Burgess
- Institute of Life Course and Medical Sciences and the Pain Research Institute, University of Liverpool and Liverpool University Hospital NHS Foundation Trust, Liverpool L9 7AL, UK; (A.J.N.); (J.B.); (J.N.); (A.M.); (A.G.M.)
| | - Ioannis N. Petropoulos
- Research Division, Weill Cornell Medicine-Qatar, Qatar Foundation, Education City, Doha 24144, Qatar; (I.N.P.); (R.A.M.)
| | - Jael Nizza
- Institute of Life Course and Medical Sciences and the Pain Research Institute, University of Liverpool and Liverpool University Hospital NHS Foundation Trust, Liverpool L9 7AL, UK; (A.J.N.); (J.B.); (J.N.); (A.M.); (A.G.M.)
| | - Anne Marshall
- Institute of Life Course and Medical Sciences and the Pain Research Institute, University of Liverpool and Liverpool University Hospital NHS Foundation Trust, Liverpool L9 7AL, UK; (A.J.N.); (J.B.); (J.N.); (A.M.); (A.G.M.)
| | - Emily Brown
- Obesity and Endocrinology Research Group, Institute of Life Course and Medical Sciences, University of Liverpool and Liverpool University Hospital NHS Foundation Trust, Liverpool L9 7AL, UK; (E.B.); (D.J.C.)
| | - Daniel J. Cuthbertson
- Obesity and Endocrinology Research Group, Institute of Life Course and Medical Sciences, University of Liverpool and Liverpool University Hospital NHS Foundation Trust, Liverpool L9 7AL, UK; (E.B.); (D.J.C.)
| | - Andrew G. Marshall
- Institute of Life Course and Medical Sciences and the Pain Research Institute, University of Liverpool and Liverpool University Hospital NHS Foundation Trust, Liverpool L9 7AL, UK; (A.J.N.); (J.B.); (J.N.); (A.M.); (A.G.M.)
- Institute of Cardiovascular Sciences, Cardiac Centre, Faculty of Medical and Human Sciences, University of Manchester and NIHR/Wellcome Trust Clinical Research Facility, Manchester M13 9WL, UK
| | - Rayaz A. Malik
- Research Division, Weill Cornell Medicine-Qatar, Qatar Foundation, Education City, Doha 24144, Qatar; (I.N.P.); (R.A.M.)
- Institute of Cardiovascular Sciences, Cardiac Centre, Faculty of Medical and Human Sciences, University of Manchester and NIHR/Wellcome Trust Clinical Research Facility, Manchester M13 9WL, UK
| | - Uazman Alam
- Institute of Life Course and Medical Sciences and the Pain Research Institute, University of Liverpool and Liverpool University Hospital NHS Foundation Trust, Liverpool L9 7AL, UK; (A.J.N.); (J.B.); (J.N.); (A.M.); (A.G.M.)
- Division of Diabetes, Endocrinology and Gastroenterology, Institute of Human Development, University of Manchester, Manchester M13 9PL, UK
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35
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Khan A, Pasquier J, Ramachandran V, Ponirakis G, Petropoulos IN, Chidiac O, Thomas B, Robay A, Jayyousi A, Al Suwaidi J, Rafii A, Menzies RA, Talal TK, Najafi-Shoushtari SH, Abi Khalil C, Malik RA. Altered Circulating microRNAs in Patients with Diabetic Neuropathy and Corneal Nerve Loss: A Pilot Study. J Clin Med 2022; 11:jcm11061632. [PMID: 35329958 PMCID: PMC8956033 DOI: 10.3390/jcm11061632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 02/09/2022] [Accepted: 02/27/2022] [Indexed: 02/05/2023] Open
Abstract
An alteration in circulating miRNAs may have important diagnostic and therapeutic relevance in diabetic neuropathy. Patients with type 2 diabetes mellitus (T2DM) underwent an assessment of neuropathic symptoms using Douleur Neuropathique 4 (DN4), the vibration perception threshold (VPT) using a Neurothesiometer, sudomotor function using the Sudoscan, corneal nerve morphology using corneal confocal microscopy (CCM) and circulating miRNAs using high-throughput miRNA expression profiling. Patients with T2DM, with (n = 9) and without (n = 7) significant corneal nerve loss were comparable in age, gender, diabetes duration, BMI, HbA1c, eGFR, blood pressure, and lipid profile. The VPT was significantly higher (p < 0.05), and electrochemical skin conductance (p < 0.05), corneal nerve fiber density (p = 0.001), corneal nerve branch density (p = 0.013), and corneal nerve fiber length (p < 0.001) were significantly lower in T2DM patients with corneal nerve loss compared to those without corneal nerve loss. Following a q-PCR-based analysis of total plasma microRNAs, we found that miR-92b-3p (p = 0.008) was significantly downregulated, while miR-22-3p (p = 0.0001) was significantly upregulated in T2DM patients with corneal nerve loss. A network analysis revealed that these miRNAs regulate axonal guidance and neuroinflammation genes. These data support the need for more extensive studies to better understand the role of dysregulated miRNAs’ in diabetic neuropathy.
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Affiliation(s)
- Adnan Khan
- Department of Medicine, Weill Cornell Medicine-Qatar, Doha P.O. Box 24144, Qatar; (A.K.); (G.P.); (I.N.P.)
- Faculty of Health Sciences, Khyber Medical University, Peshawar P.O. Box 25100, Pakistan
| | - Jennifer Pasquier
- Epigenetics Cardiovascular Laboratory, Department of Genetic Medicine, Weill Cornell Medicine-Qatar, Doha P.O. Box 24144, Qatar; (J.P.); (O.C.); (B.T.); (A.R.); (A.R.)
| | - Vimal Ramachandran
- MicroRNA Core Laboratory, Research Division, Weill Cornell Medicine-Qatar, Doha P.O. Box 24144, Qatar; (V.R.); (S.H.N.-S.)
- Department of Cell and Developmental Biology, Weill Cornell Medicine, New York, NY 10065, USA
| | - Georgios Ponirakis
- Department of Medicine, Weill Cornell Medicine-Qatar, Doha P.O. Box 24144, Qatar; (A.K.); (G.P.); (I.N.P.)
| | - Ioannis N. Petropoulos
- Department of Medicine, Weill Cornell Medicine-Qatar, Doha P.O. Box 24144, Qatar; (A.K.); (G.P.); (I.N.P.)
| | - Omar Chidiac
- Epigenetics Cardiovascular Laboratory, Department of Genetic Medicine, Weill Cornell Medicine-Qatar, Doha P.O. Box 24144, Qatar; (J.P.); (O.C.); (B.T.); (A.R.); (A.R.)
| | - Binitha Thomas
- Epigenetics Cardiovascular Laboratory, Department of Genetic Medicine, Weill Cornell Medicine-Qatar, Doha P.O. Box 24144, Qatar; (J.P.); (O.C.); (B.T.); (A.R.); (A.R.)
| | - Amal Robay
- Epigenetics Cardiovascular Laboratory, Department of Genetic Medicine, Weill Cornell Medicine-Qatar, Doha P.O. Box 24144, Qatar; (J.P.); (O.C.); (B.T.); (A.R.); (A.R.)
| | - Amin Jayyousi
- Hamad Medical Corporation, Doha P.O. Box 24144, Qatar; (A.J.); (J.A.S.); (R.A.M.); (T.K.T.)
| | - Jassim Al Suwaidi
- Hamad Medical Corporation, Doha P.O. Box 24144, Qatar; (A.J.); (J.A.S.); (R.A.M.); (T.K.T.)
| | - Arash Rafii
- Epigenetics Cardiovascular Laboratory, Department of Genetic Medicine, Weill Cornell Medicine-Qatar, Doha P.O. Box 24144, Qatar; (J.P.); (O.C.); (B.T.); (A.R.); (A.R.)
| | - Robert A. Menzies
- Hamad Medical Corporation, Doha P.O. Box 24144, Qatar; (A.J.); (J.A.S.); (R.A.M.); (T.K.T.)
| | - Talal K. Talal
- Hamad Medical Corporation, Doha P.O. Box 24144, Qatar; (A.J.); (J.A.S.); (R.A.M.); (T.K.T.)
| | - Seyed Hani Najafi-Shoushtari
- MicroRNA Core Laboratory, Research Division, Weill Cornell Medicine-Qatar, Doha P.O. Box 24144, Qatar; (V.R.); (S.H.N.-S.)
- Department of Cell and Developmental Biology, Weill Cornell Medicine, New York, NY 10065, USA
| | - Charbel Abi Khalil
- Epigenetics Cardiovascular Laboratory, Department of Genetic Medicine, Weill Cornell Medicine-Qatar, Doha P.O. Box 24144, Qatar; (J.P.); (O.C.); (B.T.); (A.R.); (A.R.)
- Joan and Sanford I. Weill Department of Medicine, Weill Cornell Medicine, New York, NY 10065, USA
- Correspondence: (C.A.K.); (R.A.M.); Tel.: +974-4492-8484 (C.A.K.); +974-4492-8256 (R.A.M.)
| | - Rayaz A. Malik
- Department of Medicine, Weill Cornell Medicine-Qatar, Doha P.O. Box 24144, Qatar; (A.K.); (G.P.); (I.N.P.)
- Correspondence: (C.A.K.); (R.A.M.); Tel.: +974-4492-8484 (C.A.K.); +974-4492-8256 (R.A.M.)
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Abstract
Diabetes polyneuropathy is an important complication of diabetes polyneuropathy, and its notable sequelae of foot ulceration, autonomic dysfunction, and neuropathic pain are associated with significant morbidity and mortality. Despite the major impact on quality of life and health economic costs, it remains underdiagnosed until late in its natural history, and there is lack of any intervention that can reverse its clinical progress. Assessment of small fiber neuropathy (SFN) in diabetes offers an opportunity to detect abnormalities at an early stage so that both interventional studies and preventative measures can be enacted to prevent progression to the devastating complications of foot ulceration and cardiac dysautonomic death. Over the last two decades, significant advances have been made in understanding the pathophysiology of diabetes neuropathy and its assessment. In this review, we discuss limitations of the screening methods recommended in current clinical guidelines which are based on large nerve fiber assessments. Thereafter, we discuss in detail the various methods currently available to assess small fiber structure and function and examine their individual strength and limitations. Finally, we discuss the reasons why despite the considerable body of evidence available, legislators and global experts have yet to incorporate the assessment of SFN as routine clinical surveillance in diabetes management. We hope that these insights will stimulate further discussion and be instrumental in the early adoption of these methods so as to reduce the burden of complications arising due to diabetes polyneuropathy.
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Affiliation(s)
- Sanjeev Sharma
- Diabetes Trails unit, Ipswich Hospital
(ESNEFT), Ipswich, UK
| | - Prashanth Vas
- Department of Diabetes, Kings College
Hospital, London, UK
| | - Gerry Rayman
- Diabetes Trails unit, Ipswich Hospital
(ESNEFT), Ipswich, UK
- Gerry Rayman, MD, Diabetes Trials Unit,
Department of Diabetes & Endocrinology, Ipswich Hospital, ESNEFT, Heath
Road, Ipswich, Suffolk IP4 5RH, UK.
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37
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Cao J, Qu J, Odilov B, Lu B, Zhang Y, Li L, Zhang Y, Xiong Q, Hong Y, Li J, Shen Y, Hou X. Corneal Nerve Parameter Reference Values for Chinese Adults Assessed by Corneal Confocal Microscopy. J Diabetes Res 2022; 2022:4913031. [PMID: 35265718 PMCID: PMC8898861 DOI: 10.1155/2022/4913031] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Accepted: 02/09/2022] [Indexed: 11/18/2022] Open
Abstract
Background Confocal corneal microscopy is an excellent new noninvasive tool for assessing diabetic peripheral neuropathy. We aimed to investigate the clinical variables associated with corneal nerve parameters and establish reference values for clinical use in healthy Chinese adults. Methods The study enlisted 257 healthy volunteers (137 females and 120 males) from two clinical academic centers in China. Two experts captured and selected images of the central corneal subbasal nerve plexus at each center using the same corneal confocal microscopy instrument according to a commonly adopted protocol. Corneal nerve fiber density (CNFD), corneal nerve branch density (CNBD), and corneal nerve fiber length (CNFL) were measured using fully automated software (ACCMetrics). The correlation between clinical indicators and confocal corneal microscopy measures was determined using partial correlation. Quantile regression was used to calculate reference values and estimate the effects of clinical factors on the normative values of confocal corneal microscopy measures. Results Females had significantly higher CNFD, CNBD, and CNFL than males. There was no correlation between age, glycated hemoglobin (HbA1c), height, weight, body mass index (BMI), and any corneal nerve fiber parameter in both sexes. In either sex, age, weight, height, BMI, and HbA1c did not affect the 0.05th quantile values of any corneal nerve parameter. Conclusions This study establishes sex-adjusted reference values for corneal confocal microscopy measures in Chinese adults and provides a reference for clinical practice and research with this technique.
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Affiliation(s)
- Juan Cao
- Department of Endocrinology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012, China
- Department of Health Management Center, Qilu Hospital of Shandong University, 107 Wenhua W Road, Jinan, Shandong 250012, China
| | - Jingru Qu
- Department of Endocrinology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012, China
- Institute of Endocrine and Metabolic Diseases of Shandong University, 107 Wenhua W Road, Jinan, Shandong 250012, China
- Key Laboratory of Endocrine and Metabolic Diseases, Shandong Province Medicine & Health, 107 Wenhua W Road, Jinan, Shandong 250012, China
- Jinan Clinical Research Center for Endocrine and Metabolic Diseases, Shandong Province Medicine & Health, 107 Wenhua W Road, Jinan, Shandong 250012, China
| | - Bekzod Odilov
- Department of Endocrinology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012, China
| | - Bin Lu
- Department of Endocrinology and Metabolism, Huashan Hospital, Fudan University, 12 Wulumuqi Middle Road, Shanghai 200040, China
| | - Yuanpin Zhang
- Department of Endocrinology and Metabolism, Huashan Hospital, Fudan University, 12 Wulumuqi Middle Road, Shanghai 200040, China
| | - Lili Li
- Department of Endocrinology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012, China
- Department of Ultrasound, Qilu Hospital of Shandong University, 758 Hefei Road, Qingdao, Shandong 266000, China
| | - Yuan Zhang
- Clinical Epidemiology Unit, Qilu Hospital of Shandong University, 107 Wenhua W Road, Jinan, Shandong 250012, China
- Clinical Research Center of Shandong University, 107 Wenhua W Road, Jinan, Shandong 250012, China
| | - Qian Xiong
- Department of Endocrinology and Metabolism, Gonghui Hospital, 315 Shimen No. 1 Road, Shanghai 200040, China
| | - Yu Hong
- Department of Endocrinology and Metabolism, Gonghui Hospital, 315 Shimen No. 1 Road, Shanghai 200040, China
| | - Jianqiao Li
- Department of Ophthalmology, Qilu Hospital of Shandong University, 107 Wenhua W Road, Jinan, Shandong 250012, China
| | - Yunfeng Shen
- Department of Endocrinology and Metabolism, Institute for the Study of Endocrinology and Metabolism in Jiangxi Province, The Second Affiliated Hospital of Nanchang University, 1 Minde Road, Nanchang, Jiangxi 330006, China
| | - Xinguo Hou
- Department of Endocrinology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250012, China
- Institute of Endocrine and Metabolic Diseases of Shandong University, 107 Wenhua W Road, Jinan, Shandong 250012, China
- Key Laboratory of Endocrine and Metabolic Diseases, Shandong Province Medicine & Health, 107 Wenhua W Road, Jinan, Shandong 250012, China
- Jinan Clinical Research Center for Endocrine and Metabolic Diseases, Shandong Province Medicine & Health, 107 Wenhua W Road, Jinan, Shandong 250012, China
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38
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Ponirakis G, Ghandi R, Ahmed A, Gad H, Petropoulos IN, Khan A, Elsotouhy A, Vattoth S, Alshawwaf MKM, Khoodoruth MAS, Ramadan M, Bhagat A, Currie J, Mahfoud Z, Al Hamad H, Own A, M Haddad P, Alabdulla M, Malik RA, Woodruff PW. Abnormal corneal nerve morphology and brain volume in patients with schizophrenia. Sci Rep 2022; 12:1870. [PMID: 35115592 PMCID: PMC8814184 DOI: 10.1038/s41598-022-05609-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Accepted: 01/13/2022] [Indexed: 12/27/2022] Open
Abstract
Neurodevelopmental and neurodegenerative pathology occur in Schizophrenia. This study compared the utility of corneal confocal microscopy (CCM), an ophthalmic imaging technique with MRI brain volumetry in quantifying neuronal pathology and its relationship to cognitive dysfunction and symptom severity in schizophrenia. Thirty-six subjects with schizophrenia and 26 controls underwent assessment of cognitive function, symptom severity, CCM and MRI brain volumetry. Subjects with schizophrenia had lower cognitive function (P ≤ 0.01), corneal nerve fiber density (CNFD), length (CNFL), branch density (CNBD), CNBD:CNFD ratio (P < 0.0001) and cingulate gyrus volume (P < 0.05) but comparable volume of whole brain (P = 0.61), cortical gray matter (P = 0.99), ventricle (P = 0.47), hippocampus (P = 0.10) and amygdala (P = 0.68). Corneal nerve measures and cingulate gyrus volume showed no association with symptom severity (P = 0.35–0.86 and P = 0.50) or cognitive function (P = 0.35–0.86 and P = 0.49). Corneal nerve measures were not associated with metabolic syndrome (P = 0.61–0.64) or diabetes (P = 0.057–0.54). The area under the ROC curve distinguishing subjects with schizophrenia from controls was 88% for CNFL, 84% for CNBD and CNBD:CNFD ratio, 79% for CNFD and 73% for the cingulate gyrus volume. This study has identified a reduction in corneal nerve fibers and cingulate gyrus volume in schizophrenia, but no association with symptom severity or cognitive dysfunction. Corneal nerve loss identified using CCM may act as a rapid non-invasive surrogate marker of neurodegeneration in patients with schizophrenia.
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Affiliation(s)
- Georgios Ponirakis
- Department of Medicine, Weill Cornell Medicine-Qatar, Qatar Foundation, Education City, Doha, Qatar
| | - Reem Ghandi
- Psychiatry Hospital, Mental Health Service, Hamad Medical Corporation, Doha, Qatar
| | - Amani Ahmed
- Psychiatry Hospital, Mental Health Service, Hamad Medical Corporation, Doha, Qatar
| | - Hoda Gad
- Department of Medicine, Weill Cornell Medicine-Qatar, Qatar Foundation, Education City, Doha, Qatar
| | - Ioannis N Petropoulos
- Department of Medicine, Weill Cornell Medicine-Qatar, Qatar Foundation, Education City, Doha, Qatar
| | - Adnan Khan
- Department of Medicine, Weill Cornell Medicine-Qatar, Qatar Foundation, Education City, Doha, Qatar
| | - Ahmed Elsotouhy
- Department of Medicine, Weill Cornell Medicine-Qatar, Qatar Foundation, Education City, Doha, Qatar.,Neuroradiology, Hamad General Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Surjith Vattoth
- Radiology, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | | | | | - Marwan Ramadan
- Geriatric, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Anjushri Bhagat
- Psychiatry Hospital, Mental Health Service, Hamad Medical Corporation, Doha, Qatar
| | - James Currie
- Psychiatry Hospital, Mental Health Service, Hamad Medical Corporation, Doha, Qatar
| | - Ziyad Mahfoud
- Department of Medicine, Weill Cornell Medicine-Qatar, Qatar Foundation, Education City, Doha, Qatar
| | - Hanadi Al Hamad
- Geriatric, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Ahmed Own
- Neuroradiology, Hamad General Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Peter M Haddad
- Psychiatry Hospital, Mental Health Service, Hamad Medical Corporation, Doha, Qatar.,College of Medicine, Qatar University, Doha, Qatar.,Division of Psychology and Mental Health, School of Health Sciences, University of Manchester, Manchester, UK
| | - Majid Alabdulla
- Psychiatry Hospital, Mental Health Service, Hamad Medical Corporation, Doha, Qatar.,College of Medicine, Qatar University, Doha, Qatar
| | - Rayaz A Malik
- Department of Medicine, Weill Cornell Medicine-Qatar, Qatar Foundation, Education City, Doha, Qatar.,Institute of Cardiovascular Science, University of Manchester, Manchester, UK
| | - Peter W Woodruff
- Department of Medicine, Weill Cornell Medicine-Qatar, Qatar Foundation, Education City, Doha, Qatar. .,Psychiatry Hospital, Mental Health Service, Hamad Medical Corporation, Doha, Qatar. .,Department of Neuroscience, School of Medicine,, University of Sheffield, Western Bank, Sheffield, S10 2TN, South Yorkshire, UK.
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Verdugo RJ, Matamala JM, Inui K, Kakigi R, Valls-Solé J, Hansson P, Bernhard Nilsen K, Lombardi R, Lauria G, Petropoulos IN, Malik RA, Treede RD, Baumgärtner U, Jara PA, Campero M. Review of techniques useful for the assessment of sensory small fiber neuropathies: Report from an IFCN expert group. Clin Neurophysiol 2022; 136:13-38. [DOI: 10.1016/j.clinph.2022.01.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 01/04/2022] [Accepted: 01/06/2022] [Indexed: 02/09/2023]
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40
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Corneal Confocal Microscopy in the Diagnosis of Small Fiber Neuropathy: Faster, Easier, and More Efficient Than Skin Biopsy? PATHOPHYSIOLOGY 2021; 29:1-8. [PMID: 35366285 PMCID: PMC8954271 DOI: 10.3390/pathophysiology29010001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 12/13/2021] [Accepted: 12/14/2021] [Indexed: 02/06/2023] Open
Abstract
Chronic pain may affect 30–50% of the world’s population and an important cause is small fiber neuropathy (SFN). Recent research suggests that autoimmune diseases may be one of the most common causes of small nerve fiber damage. There is low awareness of SFN among patients and clinicians and it is difficult to diagnose as routine electrophysiological methods only detect large fiber abnormalities, and specialized small fiber tests, like skin biopsy and quantitative sensory testing, are not routinely available. Corneal confocal microscopy (CCM) is a rapid, non-invasive, reproducible method for quantifying small nerve fiber degeneration and regeneration, and could be an important tool for diagnosing SFN. This review considers the advantages and disadvantages of CCM and highlights the evolution of this technique from a research tool to a diagnostic test for small fiber damage, which can be a valuable contribution to the study and management of autoimmune disease.
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Chiang JCB, Goldstein D, Tavakoli A, Trinh T, Klisser J, Lewis CR, Friedlander M, Naduvilath TJ, Au K, Park SB, Krishnan AV, Markoulli M. Corneal dendritic cells and the subbasal nerve plexus following neurotoxic treatment with oxaliplatin or paclitaxel. Sci Rep 2021; 11:22884. [PMID: 34819589 PMCID: PMC8613280 DOI: 10.1038/s41598-021-02439-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Accepted: 11/08/2021] [Indexed: 02/08/2023] Open
Abstract
Immune cell infiltration has been implicated in neurotoxic chemotherapy for cancer treatment. However, our understanding of immune processes is still incomplete and current methods of observing immune cells are time consuming or invasive. Corneal dendritic cells are potent antigen-presenting cells and can be imaged with in-vivo corneal confocal microscopy. Corneal dendritic cell densities and nerve parameters in patients treated with neurotoxic chemotherapy were investigated. Patients treated for cancer with oxaliplatin (n = 39) or paclitaxel (n = 48), 3 to 24 months prior to assessment were recruited along with 40 healthy controls. Immature (ImDC), mature (MDC) and total dendritic cell densities (TotalDC), and corneal nerve parameters were analyzed from in-vivo corneal confocal microscopy images. ImDC was increased in the oxaliplatin group (Median, Md = 22.7 cells/mm2) compared to healthy controls (Md = 10.1 cells/mm2, p = 0.001), but not in the paclitaxel group (Md = 10.6 cells/mm2). ImDC was also associated with higher oxaliplatin cumulative dose (r = 0.33, p = 0.04) and treatment cycles (r = 0.40, p = 0.01). There was no significant difference in MDC between the three groups (p > 0.05). Corneal nerve parameters were reduced in both oxaliplatin and paclitaxel groups compared to healthy controls (p < 0.05). There is evidence of elevation of corneal ImDC in oxaliplatin-treated patients. Further investigation is required to explore this potential link through longitudinal studies and animal or laboratory-based immunohistochemical research.
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Affiliation(s)
- Jeremy Chung Bo Chiang
- School of Optometry and Vision Science, University of New South Wales, Sydney, Australia.
| | - David Goldstein
- Department of Medical Oncology, Prince of Wales Hospital, Sydney, Australia
- Prince of Wales Clinical School, University of New South Wales, Sydney, Australia
| | - Azadeh Tavakoli
- School of Optometry and Vision Science, University of New South Wales, Sydney, Australia
| | - Terry Trinh
- Prince of Wales Clinical School, University of New South Wales, Sydney, Australia
| | - Jacob Klisser
- Prince of Wales Clinical School, University of New South Wales, Sydney, Australia
| | - Craig R Lewis
- Department of Medical Oncology, Prince of Wales Hospital, Sydney, Australia
- Prince of Wales Clinical School, University of New South Wales, Sydney, Australia
| | - Michael Friedlander
- Department of Medical Oncology, Prince of Wales Hospital, Sydney, Australia
- Prince of Wales Clinical School, University of New South Wales, Sydney, Australia
| | - Thomas J Naduvilath
- School of Optometry and Vision Science, University of New South Wales, Sydney, Australia
- Brien Holden Vision Institute, Sydney, NSW, Australia
| | - Kimberley Au
- Prince of Wales Clinical School, University of New South Wales, Sydney, Australia
| | - Susanna B Park
- Brain and Mind Centre, Faculty of Medicine and Health, University of Sydney, Sydney, Australia
| | - Arun V Krishnan
- Prince of Wales Clinical School, University of New South Wales, Sydney, Australia
| | - Maria Markoulli
- School of Optometry and Vision Science, University of New South Wales, Sydney, Australia
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Barros A, Queiruga-Piñeiro J, Lozano-Sanroma J, Alcalde I, Gallar J, Fernández-Vega Cueto L, Alfonso JF, Quirós LM, Merayo-Lloves J. Small fiber neuropathy in the cornea of Covid-19 patients associated with the generation of ocular surface disease. Ocul Surf 2021; 23:40-48. [PMID: 34781021 PMCID: PMC8588585 DOI: 10.1016/j.jtos.2021.10.010] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 10/18/2021] [Accepted: 10/29/2021] [Indexed: 12/17/2022]
Abstract
Purpose To describe the association between Sars-CoV-2 infection and small fiber neuropathy in the cornea identified by in vivo corneal confocal microscopy. Methods Twenty-three patients who had overcome COVID-19 were recruited to this observational retrospective study. Forty-six uninfected volunteers were also recruited and studied as a control group. All subjects were examined under in vivo confocal microscopy to obtain images of corneal subbasal nerve fibers in order to study the presence of neuroma-like structures, axonal beadings and dendritic cells. The Ocular Surface Disease Index (OSDI) questionnaire and Schirmer tear test were used as indicators of Dry Eye Disease (DED) and ocular surface pathology. Results Twenty-one patients (91.31%) presented alterations of the corneal subbasal plexus and corneal tissue consistent with small fiber neuropathy. Images from healthy subjects did not indicate significant nerve fiber or corneal tissue damage. Eight patients reported increased sensations of ocular dryness after COVID-19 infection and had positive DED indicators. Beaded axons were found in 82.60% of cases, mainly in patients reporting ocular irritation symptoms. Neuroma-like images were found in 65.22% patients, more frequently in those with OSDI scores >13. Dendritic cells were found in 69.56% of patients and were more frequent in younger asymptomatic patients. The presence of morphological alterations in patients up to 10 months after recovering from Sars-CoV-2 infection points to the chronic nature of the neuropathy. Conclusions Sars-CoV-2 infection may be inducing small fiber neuropathy in the ocular surface, sharing symptomatology and morphological landmarks with DED and diabetic neuropathy.
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Affiliation(s)
| | | | | | - Ignacio Alcalde
- Instituto Universitario Fernández-Vega, Universidad de Oviedo & Fundación de Investigación Oftalmológica, Oviedo, Spain; Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Oviedo, Spain.
| | - Juana Gallar
- Instituto de Neurociencias, Universidad Miguel Hernández-CSIC, San Juan de Alicante, Spain
| | - Luis Fernández-Vega Cueto
- Instituto Oftalmológico Fernández-Vega, Oviedo, Spain; Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Oviedo, Spain.
| | - José F Alfonso
- Instituto Oftalmológico Fernández-Vega, Oviedo, Spain; Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Oviedo, Spain; Department of Surgery and Medical-Surgical Specialties, Universidad de Oviedo, Oviedo, Spain
| | - Luis M Quirós
- Instituto Universitario Fernández-Vega, Universidad de Oviedo & Fundación de Investigación Oftalmológica, Oviedo, Spain; Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Oviedo, Spain; Department of Functional Biology, Universidad de Oviedo, Oviedo, Spain
| | - Jesús Merayo-Lloves
- Instituto Oftalmológico Fernández-Vega, Oviedo, Spain; Instituto Universitario Fernández-Vega, Universidad de Oviedo & Fundación de Investigación Oftalmológica, Oviedo, Spain; Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), Oviedo, Spain; Department of Surgery and Medical-Surgical Specialties, Universidad de Oviedo, Oviedo, Spain
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Abstract
Diabetic peripheral neuropathy (DPN) is a common complication of diabetes mellitus. It often causes symmetrical paresthesia, loss of sensation, and hyperalgesia. Without early intervention, it might lead to diabetic foot ulceration, gangrene, and subsequent amputation in people with diabetes. DPN is an insidious disease and often underdiagnosed. This paper reviews the current national and international prevalence of DPN, screening methods for early DPN, including quantitative sensory measurement, neurological function scoring system, confocal microscopy, and high-frequency ultrasound, and summarizes the related research progress, clinical application, and development prospects of these methods in recent years.
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Affiliation(s)
- Yongchun Yu
- Department of Endocrinology, Lhasa People’s Hospital, Lhasa, China
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44
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Signs of long-term corneal nerve deterioration after uneventful cataract surgery. J Cataract Refract Surg 2021; 48:372-373. [PMID: 34654778 DOI: 10.1097/j.jcrs.0000000000000792] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Accepted: 08/15/2021] [Indexed: 11/25/2022]
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45
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Jeong S, Yoo SW, Kim HJ, Park J, Kim JW, Lee C, Kim H. Recent Progress on Molecular Photoacoustic Imaging with Carbon-Based Nanocomposites. MATERIALS (BASEL, SWITZERLAND) 2021; 14:5643. [PMID: 34640053 PMCID: PMC8510032 DOI: 10.3390/ma14195643] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 09/25/2021] [Accepted: 09/27/2021] [Indexed: 12/20/2022]
Abstract
For biomedical imaging, the interest in noninvasive imaging methods is ever increasing. Among many modalities, photoacoustic imaging (PAI), which is a combination of optical and ultrasound imaging techniques, has received attention because of its unique advantages such as high spatial resolution, deep penetration, and safety. Incorporation of exogenous imaging agents further amplifies the effective value of PAI, since they can deliver other specified functions in addition to imaging. For these agents, carbon-based materials can show a large specific surface area and interesting optoelectronic properties, which increase their effectiveness and have proved their potential in providing a theragnostic platform (diagnosis + therapy) that is essential for clinical use. In this review, we introduce the current state of the PAI modality, address recent progress on PAI imaging that takes advantage of carbon-based agents, and offer a future perspective on advanced PAI systems using carbon-based agents.
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Affiliation(s)
- Songah Jeong
- School of Polymer Science and Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Korea; (S.J.); (H.J.K.); (J.P.); (J.W.K.)
| | - Su Woong Yoo
- Department of Nuclear Medicine, Chonnam National University Hwasun Hospital, 264, Seoyang-ro, Hwasun-eup, Hwasun-gun 58128, Jeollanam-do, Korea;
| | - Hea Ji Kim
- School of Polymer Science and Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Korea; (S.J.); (H.J.K.); (J.P.); (J.W.K.)
| | - Jieun Park
- School of Polymer Science and Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Korea; (S.J.); (H.J.K.); (J.P.); (J.W.K.)
| | - Ji Woo Kim
- School of Polymer Science and Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Korea; (S.J.); (H.J.K.); (J.P.); (J.W.K.)
| | - Changho Lee
- Department of Nuclear Medicine, Chonnam National University Hwasun Hospital, 264, Seoyang-ro, Hwasun-eup, Hwasun-gun 58128, Jeollanam-do, Korea;
- Department of Nuclear Medicine, Chonnam National University Medical School, 160, Baekseo-ro, Dong-gu, Gwangju 61469, Korea
- Department of Artificial Intelligence Convergence, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Korea
| | - Hyungwoo Kim
- School of Polymer Science and Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Korea; (S.J.); (H.J.K.); (J.P.); (J.W.K.)
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46
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Al-Janahi E, Ponirakis G, Al Hamad H, Vattoth S, Elsotouhy A, Petropoulos IN, Khan A, Gad H, Chandran M, Sankaranarayanan A, Ramadan M, Elorrabi M, Gadelseed M, Tosino R, Gawhale PV, Arasn A, Alobaidi M, Khan S, Manikoth P, Hamdi Y, Osman S, Nadukkandiyil N, AlSulaiti E, Thodi N, Almuhannadi H, Mahfoud ZR, Own A, Shuaib A, Malik RA. Corneal Nerve and Brain Imaging in Mild Cognitive Impairment and Dementia. J Alzheimers Dis 2021; 77:1533-1543. [PMID: 32925064 PMCID: PMC7683060 DOI: 10.3233/jad-200678] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Background: Visual rating of medial temporal lobe atrophy (MTA) is an accepted structural neuroimaging marker of Alzheimer’s disease. Corneal confocal microscopy (CCM) is a non-invasive ophthalmic technique that detects neuronal loss in peripheral and central neurodegenerative disorders. Objective: To determine the diagnostic accuracy of CCM for mild cognitive impairment (MCI) and dementia compared to medial temporal lobe atrophy (MTA) rating on MRI. Methods: Subjects aged 60–85 with no cognitive impairment (NCI), MCI, and dementia based on the ICD-10 criteria were recruited. Subjects underwent cognitive screening, CCM, and MTA rating on MRI. Results: 182 subjects with NCI (n = 36), MCI (n = 80), and dementia (n = 66), including AD (n = 19, 28.8%), VaD (n = 13, 19.7%), and mixed AD (n = 34, 51.5%) were studied. CCM showed a progressive reduction in corneal nerve fiber density (CNFD, fibers/mm2) (32.0±7.5 versus 24.5±9.6 and 20.8±9.3, p < 0.0001), branch density (CNBD, branches/mm2) (90.9±46.5 versus 59.3±35.7 and 53.9±38.7, p < 0.0001), and fiber length (CNFL, mm/mm2) (22.9±6.1 versus 17.2±6.5 and 15.8±7.4, p < 0.0001) in subjects with MCI and dementia compared to NCI. The area under the ROC curve (95% CI) for the diagnostic accuracy of CNFD, CNBD, CNFL compared to MTA-right and MTA-left for MCI was 78% (67–90%), 82% (72–92%), 86% (77–95%) versus 53% (36–69%) and 40% (25–55%), respectively, and for dementia it was 85% (76–94%), 84% (75–93%), 85% (76–94%) versus 86% (76–96%) and 82% (72–92%), respectively. Conclusion: The diagnostic accuracy of CCM, a non-invasive ophthalmic biomarker of neurodegeneration, was high and comparable with MTA rating for dementia but was superior to MTA rating for MCI.
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Affiliation(s)
- Eiman Al-Janahi
- Weill Cornell Medicine-Qatar, Qatar Foundation, Education City, Doha, Qatar
| | - Georgios Ponirakis
- Weill Cornell Medicine-Qatar, Qatar Foundation, Education City, Doha, Qatar.,Manchester Metropolitan University, Faculty of Science and Engineering, Manchester, UK
| | - Hanadi Al Hamad
- Geriatric & Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Surjith Vattoth
- Weill Cornell Medicine-Qatar, Qatar Foundation, Education City, Doha, Qatar.,Neuroradiology, Hamad General Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Ahmed Elsotouhy
- Neuroradiology, Hamad General Hospital, Hamad Medical Corporation, Doha, Qatar
| | | | - Adnan Khan
- Weill Cornell Medicine-Qatar, Qatar Foundation, Education City, Doha, Qatar
| | - Hoda Gad
- Weill Cornell Medicine-Qatar, Qatar Foundation, Education City, Doha, Qatar
| | - Mani Chandran
- Geriatric & Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | | | - Marwan Ramadan
- Geriatric & Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Marwa Elorrabi
- Geriatric & Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Masharig Gadelseed
- Geriatric & Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Rhia Tosino
- Geriatric & Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Priya V Gawhale
- Geriatric & Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Anjum Arasn
- Geriatric & Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Maryam Alobaidi
- Geriatric & Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Shafi Khan
- Geriatric & Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Pravija Manikoth
- Geriatric & Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Yasmin Hamdi
- Geriatric & Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Susan Osman
- Geriatric & Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Navas Nadukkandiyil
- Geriatric & Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Essa AlSulaiti
- Geriatric & Memory Clinic, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Noushad Thodi
- MRI Unit, Rumailah Hospital, Hamad Medical Corporation, Doha, Qatar
| | - Hamad Almuhannadi
- Weill Cornell Medicine-Qatar, Qatar Foundation, Education City, Doha, Qatar
| | - Ziyad R Mahfoud
- Weill Cornell Medicine-Qatar, Qatar Foundation, Education City, Doha, Qatar
| | - Ahmed Own
- School of Medicine, Western Sydney University, New South Wales, Australia
| | - Ashfaq Shuaib
- Department of Medicine, University of Alberta, Alberta, Canada
| | - Rayaz A Malik
- Weill Cornell Medicine-Qatar, Qatar Foundation, Education City, Doha, Qatar.,Manchester Metropolitan University, Faculty of Science and Engineering, Manchester, UK.,Institute of Cardiovascular Science, University of Manchester, Manchester, UK
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Petropoulos IN, Ponirakis G, Ferdousi M, Azmi S, Kalteniece A, Khan A, Gad H, Bashir B, Marshall A, Boulton AJM, Soran H, Malik RA. Corneal Confocal Microscopy: A Biomarker for Diabetic Peripheral Neuropathy. Clin Ther 2021; 43:1457-1475. [PMID: 33965237 DOI: 10.1016/j.clinthera.2021.04.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 04/05/2021] [Accepted: 04/08/2021] [Indexed: 02/08/2023]
Abstract
PURPOSE Diagnosing early diabetic peripheral neuropathy remains a challenge due to deficiencies in currently advocated end points. The cornea is densely innervated with small sensory fibers, which are structurally and functionally comparable to intraepidermal nerve fibers. Corneal confocal microscopy is a method for rapid, noninvasive scanning of the living cornea with high resolution and magnification. METHODS This narrative review presents the framework for the development of biomarkers and the literature on the use and adoption of corneal confocal microscopy as an objective, diagnostic biomarker in experimental and clinical studies of diabetic peripheral neuropathy. A search was performed on PubMed and Google Scholar based on the terms "corneal confocal microscopy," "diabetic neuropathy," "corneal sensitivity," and "clinical trials." FINDINGS A substantial body of evidence underpins the thesis that corneal nerve loss predicts incident neuropathy and progresses with the severity of diabetic peripheral neuropathy. Corneal confocal microscopy also identifies early corneal nerve regeneration, strongly arguing for its inclusion as a surrogate end point in clinical trials of disease-modifying therapies. IMPLICATIONS There are sufficient diagnostic and prospective validation studies to fulfill the US Food and Drug Administration criteria for a biomarker to support the inclusion of corneal confocal microscopy as a primary end point in clinical trials of disease-modifying therapies in diabetic neuropathy.
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Affiliation(s)
| | | | - Maryam Ferdousi
- Faculty of Biology, Medicine and Health, University of Manchester, Cardiovascular Trials Unit, Manchester University NHS Foundation Trust, Manchester, United Kingdom
| | - Shazli Azmi
- Faculty of Biology, Medicine and Health, University of Manchester, Cardiovascular Trials Unit, Manchester University NHS Foundation Trust, Manchester, United Kingdom; Centre for Diabetes, Endocrinology and Metabolism, Manchester University NHS Foundation Trust, Manchester, United Kingdom
| | - Alise Kalteniece
- Faculty of Biology, Medicine and Health, University of Manchester, Cardiovascular Trials Unit, Manchester University NHS Foundation Trust, Manchester, United Kingdom
| | - Adnan Khan
- Research Division, Weill Cornell Medicine-Qatar, Doha, Qatar
| | - Hoda Gad
- Research Division, Weill Cornell Medicine-Qatar, Doha, Qatar
| | - Bilal Bashir
- Centre for Diabetes, Endocrinology and Metabolism, Manchester University NHS Foundation Trust, Manchester, United Kingdom
| | - Andrew Marshall
- Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, United Kingdom; Clinical Neurophysiology, The Walton Centre, Liverpool, United Kingdom; Division of Neuroscience and Experimental Psychology, Faculty of Medical and Human Sciences, University of Manchester, Manchester, United Kingdom
| | - Andrew J M Boulton
- Faculty of Biology, Medicine and Health, University of Manchester, Cardiovascular Trials Unit, Manchester University NHS Foundation Trust, Manchester, United Kingdom; Centre for Diabetes, Endocrinology and Metabolism, Manchester University NHS Foundation Trust, Manchester, United Kingdom
| | - Handrean Soran
- Faculty of Biology, Medicine and Health, University of Manchester, Cardiovascular Trials Unit, Manchester University NHS Foundation Trust, Manchester, United Kingdom
| | - Rayaz A Malik
- Research Division, Weill Cornell Medicine-Qatar, Doha, Qatar; Faculty of Biology, Medicine and Health, University of Manchester, Cardiovascular Trials Unit, Manchester University NHS Foundation Trust, Manchester, United Kingdom.
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48
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D'Onofrio L, Kalteniece A, Ferdousi M, Azmi S, Petropoulos IN, Ponirakis G, Alam U, Asghar O, Marshall A, Boulton AJM, Efron N, Buzzetti R, Soran H, Malik RA. Small Nerve Fiber Damage and Langerhans Cells in Type 1 and Type 2 Diabetes and LADA Measured by Corneal Confocal Microscopy. Invest Ophthalmol Vis Sci 2021; 62:5. [PMID: 33944892 PMCID: PMC8107645 DOI: 10.1167/iovs.62.6.5] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Accepted: 04/05/2021] [Indexed: 11/24/2022] Open
Abstract
Purpose Increased corneal and epidermal Langerhans cells (LCs) have been reported in patients with diabetic neuropathy. The aim of this study was to quantify the density of LCs in relation to corneal nerve morphology and the presence of diabetic neuropathy and to determine if this differed in patients with type 1 diabetes mellitus (T1DM), type 2 diabetes mellitus (T2DM), and latent autoimmune diabetes of adults (LADA). Methods Patients with T1DM (n = 25), T2DM (n = 36), or LADA (n = 23) and control subjects (n = 23) underwent detailed assessment of peripheral neuropathy and corneal confocal microscopy. Corneal nerve fiber density (CNFD), branch density (CNBD), length (CNFL) and total, immature and mature LC densities were quantified. Results Lower CNFD (P < 0.001), CNBD (P < 0.0001), and CNFL (P < 0.0001) and higher LC density (P = 0.03) were detected in patients with T1DM, T2DM, and LADA compared to controls. CNBD was inversely correlated with mature (r = -0.5; P = 0.008), immature (r = -0.4; P = 0.02) and total (r = -0.5; P = 0.01) LC density, and CNFL was inversely correlated with immature LC density (r = -0.4; P = 0.03) in patients with T1DM but not in patients with T2DM and LADA. Conclusions This study shows significant corneal nerve loss and an increase in LC density in patients with T1DM, T2DM, and LADA. Furthermore, increased LC density correlated with corneal nerve loss in patients with T1DM.
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Affiliation(s)
- Luca D'Onofrio
- Department of Experimental Medicine, Sapienza University, Rome, Italy
| | - Alise Kalteniece
- Division of Cardiovascular Sciences, Faculty of Biology, Medicine and Health, University of Manchester and NIHR/Wellcome Trust Clinical Research Facility, Manchester, United Kingdom
| | - Maryam Ferdousi
- Division of Cardiovascular Sciences, Faculty of Biology, Medicine and Health, University of Manchester and NIHR/Wellcome Trust Clinical Research Facility, Manchester, United Kingdom
| | - Shazli Azmi
- Division of Cardiovascular Sciences, Faculty of Biology, Medicine and Health, University of Manchester and NIHR/Wellcome Trust Clinical Research Facility, Manchester, United Kingdom
| | - Ioannis N. Petropoulos
- Weill Cornell Medicine-Qatar, Research Division, Qatar Foundation, Education City, Doha, Qatar
| | - Georgios Ponirakis
- Weill Cornell Medicine-Qatar, Research Division, Qatar Foundation, Education City, Doha, Qatar
| | - Uazman Alam
- Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, United Kingdom
| | - Omar Asghar
- Division of Cardiovascular Sciences, Faculty of Biology, Medicine and Health, University of Manchester and NIHR/Wellcome Trust Clinical Research Facility, Manchester, United Kingdom
| | - Andrew Marshall
- Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, United Kingdom
| | - Andrew J M. Boulton
- Division of Cardiovascular Sciences, Faculty of Biology, Medicine and Health, University of Manchester and NIHR/Wellcome Trust Clinical Research Facility, Manchester, United Kingdom
| | - Nathan Efron
- Queensland University of Technology, School of Optometry and Vision Science, Brisbane, Australia
| | | | - Handrean Soran
- Division of Cardiovascular Sciences, Faculty of Biology, Medicine and Health, University of Manchester and NIHR/Wellcome Trust Clinical Research Facility, Manchester, United Kingdom
| | - Rayaz A. Malik
- Division of Cardiovascular Sciences, Faculty of Biology, Medicine and Health, University of Manchester and NIHR/Wellcome Trust Clinical Research Facility, Manchester, United Kingdom
- Weill Cornell Medicine-Qatar, Research Division, Qatar Foundation, Education City, Doha, Qatar
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Yıldız E, Arslan AT, Yıldız Taş A, Acer AF, Demir S, Şahin A, Erol Barkana D. Generative Adversarial Network Based Automatic Segmentation of Corneal Subbasal Nerves on In Vivo Confocal Microscopy Images. Transl Vis Sci Technol 2021; 10:33. [PMID: 34038501 PMCID: PMC8161698 DOI: 10.1167/tvst.10.6.33] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Accepted: 05/05/2021] [Indexed: 11/24/2022] Open
Abstract
Purpose In vivo confocal microscopy (IVCM) is a noninvasive, reproducible, and inexpensive diagnostic tool for corneal diseases. However, widespread and effortless image acquisition in IVCM creates serious image analysis workloads on ophthalmologists, and neural networks could solve this problem quickly. We have produced a novel deep learning algorithm based on generative adversarial networks (GANs), and we compare its accuracy for automatic segmentation of subbasal nerves in IVCM images with a fully convolutional neural network (U-Net) based method. Methods We have collected IVCM images from 85 subjects. U-Net and GAN-based image segmentation methods were trained and tested under the supervision of three clinicians for the segmentation of corneal subbasal nerves. Nerve segmentation results for GAN and U-Net-based methods were compared with the clinicians by using Pearson's R correlation, Bland-Altman analysis, and receiver operating characteristics (ROC) statistics. Additionally, different noises were applied on IVCM images to evaluate the performances of the algorithms with noises of biomedical imaging. Results The GAN-based algorithm demonstrated similar correlation and Bland-Altman analysis results with U-Net. The GAN-based method showed significantly higher accuracy compared to U-Net in ROC curves. Additionally, the performance of the U-Net deteriorated significantly with different noises, especially in speckle noise, compared to GAN. Conclusions This study is the first application of GAN-based algorithms on IVCM images. The GAN-based algorithms demonstrated higher accuracy than U-Net for automatic corneal nerve segmentation in IVCM images, in patient-acquired images and noise applied images. This GAN-based segmentation method can be used as a facilitating diagnostic tool in ophthalmology clinics. Translational Relevance Generative adversarial networks are emerging deep learning models for medical image processing, which could be important clinical tools for rapid segmentation and analysis of corneal subbasal nerves in IVCM images.
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Affiliation(s)
- Erdost Yıldız
- Koç University Research Center for Translational Medicine, Koç University, Istanbul, Turkey
| | | | - Ayşe Yıldız Taş
- Department of Ophthalmology, Koç University School of Medicine, Istanbul, Turkey
| | | | - Sertaç Demir
- Techy Bilişim Ltd., Eskişehir, Turkey
- Department of Computer Engineering, Eskişehir Osmangazi University, Eskişehir, Turkey
| | - Afsun Şahin
- Koç University Research Center for Translational Medicine, Koç University, Istanbul, Turkey
- Department of Ophthalmology, Koç University School of Medicine, Istanbul, Turkey
| | - Duygun Erol Barkana
- Department of Electrical and Electronics Engineering, Yeditepe University, Istanbul, Turkey
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50
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Bondugulapati LNR, Narayen N. Corneal confocal microscopy: potential usage in the context of diabetes mellitus. PRACTICAL DIABETES 2021. [DOI: 10.1002/pdi.2328] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- LN Rao Bondugulapati
- Consultant Physician in Diabetes & Endocrinology, Endocrine Unit, Maelor Hospital, Wrexham, UK
| | - Nitesh Narayen
- Consultant Ophthalmologist, Cataract, Cornea and Refractive Surgeon, Director – Nvision Eye Care, Hyderabad, India
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