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Courtie E, Kirkpatrick JRM, Taylor M, Faes L, Liu X, Logan A, Veenith T, Denniston AK, Blanch RJ. Optical coherence tomography angiography analysis methods: a systematic review and meta-analysis. Sci Rep 2024; 14:9643. [PMID: 38670997 PMCID: PMC11053039 DOI: 10.1038/s41598-024-54306-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Accepted: 02/11/2024] [Indexed: 04/28/2024] Open
Abstract
Optical coherence tomography angiography (OCTA) is widely used for non-invasive retinal vascular imaging, but the OCTA methods used to assess retinal perfusion vary. We evaluated the different methods used to assess retinal perfusion between OCTA studies. MEDLINE and Embase were searched from 2014 to August 2021. We included prospective studies including ≥ 50 participants using OCTA to assess retinal perfusion in either global retinal or systemic disorders. Risk of bias was assessed using the National Institute of Health quality assessment tool for observational cohort and cross-sectional studies. Heterogeneity of data was assessed by Q statistics, Chi-square test, and I2 index. Of the 5974 studies identified, 191 studies were included in this evaluation. The selected studies employed seven OCTA devices, six macula volume dimensions, four macula subregions, nine perfusion analyses, and five vessel layer definitions, totalling 197 distinct methods of assessing macula perfusion and over 7000 possible combinations. Meta-analysis was performed on 88 studies reporting vessel density and foveal avascular zone area, showing lower retinal perfusion in patients with diabetes mellitus than in healthy controls, but with high heterogeneity. Heterogeneity was lowest and reported vascular effects strongest in superficial capillary plexus assessments. Systematic review of OCTA studies revealed massive heterogeneity in the methods employed to assess retinal perfusion, supporting calls for standardisation of methodology.
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Affiliation(s)
- Ella Courtie
- Neuroscience and Ophthalmology Research Group, University of Birmingham, Birmingham, UK
- Department of Ophthalmology, Queen Elizabeth Hospital Birmingham, University Hospitals Birmingham NHS Foundation Trust, Birmingham, West Midlands, UK
- Surgical Reconstruction and Microbiology Research Centre, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | | | - Matthew Taylor
- University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
- University of Birmingham, Birmingham, UK
- Birmingham Women's and Children's NHS Foundation Trust, Birmingham, UK
| | - Livia Faes
- NIHR Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust, UCL Institute of Ophthalmology, London, UK
| | - Xiaoxuan Liu
- University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
- University of Birmingham, Birmingham, UK
- NIHR Birmingham Biomedical Research Centre, University Hospitals Birmingham NHSFT, Birmingham, UK
| | - Ann Logan
- Axolotl Consulting Ltd., Droitwich, Worcestershire, UK
- Division of Biomedical Sciences, Warwick Medical School, University of Warwick, Coventry, UK
| | - Tonny Veenith
- Neuroscience and Ophthalmology Research Group, University of Birmingham, Birmingham, UK
- Critical Care Unit, Queen Elizabeth Hospital Birmingham, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
- Department of Trauma Sciences, University of Birmingham, Birmingham, UK
| | - Alastair K Denniston
- Department of Ophthalmology, Queen Elizabeth Hospital Birmingham, University Hospitals Birmingham NHS Foundation Trust, Birmingham, West Midlands, UK
- NIHR Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust, UCL Institute of Ophthalmology, London, UK
- NIHR Birmingham Biomedical Research Centre, University Hospitals Birmingham NHSFT, Birmingham, UK
| | - Richard J Blanch
- Neuroscience and Ophthalmology Research Group, University of Birmingham, Birmingham, UK.
- Department of Ophthalmology, Queen Elizabeth Hospital Birmingham, University Hospitals Birmingham NHS Foundation Trust, Birmingham, West Midlands, UK.
- Surgical Reconstruction and Microbiology Research Centre, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK.
- Academic Department of Military Surgery and Trauma, Royal Centre for Defence Medicine, Birmingham, UK.
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Yao Z, Chen Y, Li D, Li Y, Liu Y, Fan H. HEMORRHAGIC SHOCK ASSESSED BY TISSUE MICROCIRCULATORY MONITORING: A NARRATIVE REVIEW. Shock 2024; 61:509-519. [PMID: 37878487 DOI: 10.1097/shk.0000000000002242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2023]
Abstract
ABSTRACT Hemorrhagic shock (HS) is a common complication after traumatic injury. Early identification of HS can reduce patients' risk of death. Currently, the identification of HS relies on macrocirculation indicators such as systolic blood pressure and heart rate, which are easily affected by the body's compensatory functions. Recently, the independence of the body's overall macrocirculation from microcirculation has been demonstrated, and microcirculation indicators have been widely used in the evaluation of HS. In this study, we reviewed the progress of research in the literature on the use of microcirculation metrics to monitor shock. We analyzed the strengths and weaknesses of each metric and found that microcirculation monitoring could not only indicate changes in tissue perfusion before changes in macrocirculation occurred but also correct tissue perfusion and cell oxygenation after the macrocirculation index returned to normal following fluid resuscitation, which is conducive to the early prediction and prognosis of HS. However, microcirculation monitoring is greatly affected by individual differences and environmental factors. Therefore, the current limitations of microcirculation assessments mean that they should be incorporated as part of an overall assessment of HS patients. Future research should explore how to better combine microcirculation and macrocirculation monitoring for the early identification and prognosis of HS patients.
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Affiliation(s)
| | | | | | - Yongnan Li
- Department of Cardiac Surgery, Lanzhou University Second Hospital, Lanzhou, China
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Watanabe K, Shiba T, Takahara A, Homma H, Komatsu T, Tanino Y, Nagasawa Y, Aimoto M, Hori Y. Evaluating the relationship between ocular blood flow and systemic organ blood flow in hemorrhagic shock using a rabbit model. Sci Rep 2024; 14:3749. [PMID: 38355984 PMCID: PMC10866860 DOI: 10.1038/s41598-024-54467-1] [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: 09/12/2023] [Accepted: 02/13/2024] [Indexed: 02/16/2024] Open
Abstract
This study aimed to investigate the feasibility of utilizing noninvasive ocular blood flow measurements as potential indicators of systemic circulation in rabbits experiencing hemorrhagic shock. Using Laser speckle flowgraphy, ocular blood flow indices, relative flow volume (RFV), and mean blur rate in the choroidal area (MBR-CH) were assessed in New Zealand White rabbits (n = 10) subjected to controlled blood removal and return. Hemodynamic parameters and biochemical markers were monitored alongside ocular circulation during blood removal and return phases. Additionally, correlations between ocular parameters and systemic indices were examined. The results indicated that RFV and MBR-CH exhibited significant correlations with renal and intestinal blood flows, with stronger correlations observed during blood removal. Additionally, ocular blood flow changes closely mirrored systemic dynamics, suggesting their potential as real-time indicators of shock progression and recovery. These findings indicate that ocular blood flow measurements may serve as real-time indicators of the systemic circulation status during hemorrhagic shock, offering potential insights into shock management and guiding tailored interventions. Thus, noninvasive ocular blood flow evaluation holds promise as an innovative tool for assessing systemic circulation dynamics during hemorrhagic shock.
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Affiliation(s)
- Kento Watanabe
- Department of Ophthalmology, Toho University, 6-11-1, Omorinishi, Oota-ku, Tokyo, 143-8541, Japan.
| | - Tomoaki Shiba
- Department of Ophthalmology, International University of Health and Welfare Narita Hospital, Chiba, Japan
| | - Akira Takahara
- Department of Pharmacology and Therapeutics, Faculty of Pharmaceutical Sciences, Toho University, Chiba, Japan
| | - Hiroshi Homma
- Department of Emergency and Critical Care Medicine, Tokyo Medical University, Tokyo, Japan
| | - Tetsuya Komatsu
- Department of Ophthalmology, Toho University, 6-11-1, Omorinishi, Oota-ku, Tokyo, 143-8541, Japan
| | - Yusuke Tanino
- Department of Emergency and Critical Care Medicine, Tokyo Medical University, Tokyo, Japan
| | - Yoshinobu Nagasawa
- Department of Pharmacology and Therapeutics, Faculty of Pharmaceutical Sciences, Toho University, Chiba, Japan
| | - Megumi Aimoto
- Department of Pharmacology and Therapeutics, Faculty of Pharmaceutical Sciences, Toho University, Chiba, Japan
| | - Yuichi Hori
- Department of Ophthalmology, Toho University, 6-11-1, Omorinishi, Oota-ku, Tokyo, 143-8541, Japan
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Gao Y, Xu L, He N, Ding Y, Zhao W, Meng T, Li M, Wu J, Haddad Y, Zhang X, Ji X. A narrative review of retinal vascular parameters and the applications (Part II): Diagnosis in stroke. Brain Circ 2023; 9:129-134. [PMID: 38020952 PMCID: PMC10679631 DOI: 10.4103/bc.bc_9_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 03/27/2023] [Accepted: 04/12/2023] [Indexed: 12/01/2023] Open
Abstract
The retina, as an external extension of the diencephalon, can be directly, noninvasively observed by ocular fundus photography. Therefore, it offers a convenient and feasible mode to study nervous system diseases. Caliber, tortuosity, and fractal dimension, as three commonly used retinal vascular parameters, are not only the reflection of structural changes in the retinal microcirculation but also capture the branching pattern or density changes of the retinal microvascular network. Therefore, it contributes to better reflecting the subclinical pathological changes (e.g., lacunar stroke and small cerebral vascular disease) and predicting the risk of incident stroke and recurrent stroke.
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Affiliation(s)
- Yuan Gao
- Department of Biomedical Engineering, Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
- Department of Ophthalmology, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Lijun Xu
- Department of School of Instrumentation and Optoelectronic Engineering, Beihang University, Beijing, China
| | - Ning He
- Engineering Research Center of Molecular and Neuro Imaging, Ministry of Education, School of Life Science and Technology, Xidian University, Xi’an, Shaanxi, China
| | - Yuchuan Ding
- Department of Neurosurgery, Wayne State University School of Medicine, Detroit, Michigan, USA
| | - Wenbo Zhao
- Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Tingting Meng
- Department of Ophthalmology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Ming Li
- Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Jiaqi Wu
- Department of Biomedical Engineering, Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
| | - Yazeed Haddad
- Department of Neurosurgery, Wayne State University School of Medicine, Detroit, Michigan, USA
| | - Xuxiang Zhang
- Department of Ophthalmology, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
| | - Xunming Ji
- Department of Biomedical Engineering, Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
- Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, China
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Bogatu L, Turco S, Mischi M, Schmitt L, Woerlee P, Bezemer R, Bouwman AR, Korsten EHHM, Muehlsteff J. New Hemodynamic Parameters in Peri-Operative and Critical Care-Challenges in Translation. SENSORS (BASEL, SWITZERLAND) 2023; 23:2226. [PMID: 36850819 PMCID: PMC9961222 DOI: 10.3390/s23042226] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Revised: 02/03/2023] [Accepted: 02/06/2023] [Indexed: 06/18/2023]
Abstract
Hemodynamic monitoring technologies are evolving continuously-a large number of bedside monitoring options are becoming available in the clinic. Methods such as echocardiography, electrical bioimpedance, and calibrated/uncalibrated analysis of pulse contours are becoming increasingly common. This is leading to a decline in the use of highly invasive monitoring and allowing for safer, more accurate, and continuous measurements. The new devices mainly aim to monitor the well-known hemodynamic variables (e.g., novel pulse contour, bioreactance methods are aimed at measuring widely-used variables such as blood pressure, cardiac output). Even though hemodynamic monitoring is now safer and more accurate, a number of issues remain due to the limited amount of information available for diagnosis and treatment. Extensive work is being carried out in order to allow for more hemodynamic parameters to be measured in the clinic. In this review, we identify and discuss the main sensing strategies aimed at obtaining a more complete picture of the hemodynamic status of a patient, namely: (i) measurement of the circulatory system response to a defined stimulus; (ii) measurement of the microcirculation; (iii) technologies for assessing dynamic vascular mechanisms; and (iv) machine learning methods. By analyzing these four main research strategies, we aim to convey the key aspects, challenges, and clinical value of measuring novel hemodynamic parameters in critical care.
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Affiliation(s)
- Laura Bogatu
- Biomedical Diagnostics Lab (BM/d), Eindhoven University of Technology, 5612 AZ Eindhoven, The Netherlands
- Patient Care and Measurements, Philips Research, 5656 AE Eindhoven, The Netherlands
| | - Simona Turco
- Biomedical Diagnostics Lab (BM/d), Eindhoven University of Technology, 5612 AZ Eindhoven, The Netherlands
| | - Massimo Mischi
- Biomedical Diagnostics Lab (BM/d), Eindhoven University of Technology, 5612 AZ Eindhoven, The Netherlands
| | - Lars Schmitt
- Patient Care and Measurements, Philips Research, 5656 AE Eindhoven, The Netherlands
| | - Pierre Woerlee
- Biomedical Diagnostics Lab (BM/d), Eindhoven University of Technology, 5612 AZ Eindhoven, The Netherlands
| | - Rick Bezemer
- Patient Care and Measurements, Philips Research, 5656 AE Eindhoven, The Netherlands
| | - Arthur R. Bouwman
- Department of Anesthesiology, Intensive Care and Pain Medicine, Catharina Ziekenhuis, 5623 EJ Eindhoven, The Netherlands
| | - Erik H. H. M. Korsten
- Department of Anesthesiology, Intensive Care and Pain Medicine, Catharina Ziekenhuis, 5623 EJ Eindhoven, The Netherlands
| | - Jens Muehlsteff
- Patient Care and Measurements, Philips Research, 5656 AE Eindhoven, The Netherlands
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Courtie E, Gilani A, Veenith T, Blanch RJ. Optical coherence tomography angiography as a surrogate marker for end-organ resuscitation in sepsis: A review. Front Med (Lausanne) 2022; 9:1023062. [PMID: 36341253 PMCID: PMC9630739 DOI: 10.3389/fmed.2022.1023062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Accepted: 10/03/2022] [Indexed: 11/25/2022] Open
Abstract
Sepsis is a severe illness which results in alterations in the end organ microvascular haemodynamics and is associated with a high risk of mortality. There is currently no real-time method of monitoring microcirculatory perfusion during sepsis. Retinal microcirculation is closely linked to cerebral perfusion and may reflect systemic vascular alterations. Retinal perfusion can be assessed using the non-invasive imaging technique of optical coherence tomography angiography (OCTA). This narrative review aims to discuss the utility of using retinal imaging and OCTA in systemic illness and sepsis. OCTA can be used as a functional, non-invasive and real-time biomarker along with other haemodynamic parameters for assessing and managing patients with sepsis.
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Affiliation(s)
- Ella Courtie
- Neuroscience and Ophthalmology Research Group, University of Birmingham, Birmingham, United Kingdom
- Department of Ophthalmology, Queen Elizabeth Hospital Birmingham, University Hospitals Birmingham NHS Foundation Trust, Birmingham, United Kingdom
- Surgical Reconstruction and Microbiology Research Centre, University Hospitals Birmingham NHS Foundation Trust, Birmingham, United Kingdom
| | - Ahmed Gilani
- Critical Care Unit, Queen Elizabeth Hospital Birmingham, University Hospitals Birmingham NHS Foundation Trust, Birmingham, United Kingdom
- Institute of Inflammation and Ageing, University of Birmingham, Birmingham, United Kingdom
| | - Tonny Veenith
- Critical Care Unit, Queen Elizabeth Hospital Birmingham, University Hospitals Birmingham NHS Foundation Trust, Birmingham, United Kingdom
- Department of Trauma Sciences, University of Birmingham, Birmingham, United Kingdom
- Tonny Veenith,
| | - Richard J. Blanch
- Neuroscience and Ophthalmology Research Group, University of Birmingham, Birmingham, United Kingdom
- Department of Ophthalmology, Queen Elizabeth Hospital Birmingham, University Hospitals Birmingham NHS Foundation Trust, Birmingham, United Kingdom
- Surgical Reconstruction and Microbiology Research Centre, University Hospitals Birmingham NHS Foundation Trust, Birmingham, United Kingdom
- *Correspondence: Richard J. Blanch,
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Yao T, He Y, Huang L, Chen J, Zhang Z, Yang W, Gao X, Dan Y, Huai S, Ou S, He Y. Quantitative vessel density analysis of macular and peripapillary areas by optical coherence tomography angiography in adults with primary nephrotic syndrome. Microvasc Res 2022; 144:104407. [PMID: 35863428 DOI: 10.1016/j.mvr.2022.104407] [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: 05/01/2022] [Revised: 06/17/2022] [Accepted: 07/13/2022] [Indexed: 11/30/2022]
Abstract
PURPOSE To compare the microvascular parameters of macular and peripapillary areas in adults with primary nephrotic syndrome (PNS) and healthy controls (HCs). METHODS In this cross-sectional study, optical coherence tomography angiography (OCTA) was used to evaluate the changes in retinal microvascular in 37 adult patients with PNS and 30 HCs in this study. All subjects underwent OCTA for measuring vascular density (VD), perfusion density (PD), and foveal avascular zone (FAZ) in the superficial capillary plexus (SCP) and optical coherence tomography (OCT) for measuring central macular thickness (CMT) and retinal nerve fiber layer (RNFL) thickness. The following clinical data of the PNS group were collected: hemoglobin, platelet, total protein, albumin, prealbumin, creatinine, urea nitrogen, glomerular filtration rate, blood lipid, urinary protein, urine microalbumin, urine microalbumin/creatinine, 24-h urine volume, and 24-h urine protein quantification. The OCTA data were compared between patients with PNS and HCs, and the correlation between the OCTA data and clinical data was analyzed in the PNS group. RESULTS VD and PD in the macular area of the PNS group were significantly lower than those in the HC group (VD: 17.025 ± 2.229 vs. 18.290 ± 0.721, P = 0.001; PD: 0.417 ± 0.058 vs. 0.450 ± 0.019, P = 0.003). No significant differences in the FAZ area and perioptic disc microvascular parameters were observed between the two groups, and patients in the PNS group showed consistent changes in the left and right eyes. VD and PD in the central macular area were positively correlated with plasma prealbumin level (VD: ρ = 0.541, P = 0.001; PD: ρ = 0.562, P < 0.001) and negatively correlated with urinary protein level (VD: ρ = -0.579, P < 0.001; PD: ρ = -0.596, P < 0.001). CONCLUSIONS In adult patients with PNS, the decrease in VD and PD was mainly occurred in the macular area. Partly vascular density of the macular area was positively correlated with plasma prealbumin level and negatively correlated with urinary protein level. OCTA provides a convenient, non-invasive and effective method for evaluating and monitoring retinal microcirculation damage in patients with PNS.
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Affiliation(s)
- Tianyu Yao
- Department of Ophthalmology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, PR China; Department of Ophthalmology, Changning County Hospital of Traditional Chinese Medicine, Yibin, PR China
| | - Yemei He
- Department of Nephrology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, PR China; Sichuan Clinical Research Center for Nephropathy, Luzhou, Sichuan 646000, PR China
| | - Li Huang
- Department of Ophthalmology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, PR China
| | - Jie Chen
- Department of Rheumatology and Immunology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, PR China
| | - Zhiru Zhang
- Department of Ophthalmology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, PR China
| | - Wei Yang
- Department of Ophthalmology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, PR China
| | | | - Yujiao Dan
- Department of Ophthalmology, The People's Hospital of Leshan, PR China
| | - Shixiang Huai
- Department of Ophthalmology, Changning County Hospital of Traditional Chinese Medicine, Yibin, PR China
| | - Santao Ou
- Department of Nephrology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, PR China; Sichuan Clinical Research Center for Nephropathy, Luzhou, Sichuan 646000, PR China.
| | - Yue He
- Department of Ophthalmology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, PR China.
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Improvement of Retinal Microcirculation after Pulmonary Vein Isolation in Patients with Atrial Fibrillation—An Optical Coherence Tomography Angiography Study. Diagnostics (Basel) 2021; 12:diagnostics12010038. [PMID: 35054205 PMCID: PMC8774642 DOI: 10.3390/diagnostics12010038] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Revised: 12/20/2021] [Accepted: 12/21/2021] [Indexed: 11/16/2022] Open
Abstract
Purpose: To evaluate retinal and optic nerve head (ONH) perfusion in patients with atrial fibrillation (AF) before and after catheter ablation of AF with pulmonary vein isolation (PVI). Methods: 34 eyes of 34 patients with AF and 35 eyes of 35 healthy subjects were included in this study. Flow density data were obtained using spectral-domain OCT-A (RTVue XR Avanti with AngioVue, Optovue, Inc, Fremont, California, USA). The data of the superficial and deep vascular layers of the macula and the ONH (radial peripapillary capillary network, RPC) before and after PVI were extracted and analysed. Results: The flow density in the superficial OCT-angiogram (whole en face) and the ONH (RPC) in patients with AF was significantly lower compared to healthy controls (OCT-A superficial: study group: 48.77 (45.19; 52.12)%; control group: 53.01 (50.00; 54.25)%; p < 0.001; ONH: study group: 51.82 (48.41; 54.03)%; control group: 56.00 (54.35; 57.70)%; p < 0.001;). The flow density in the ONH (RPC) improved significantly in the study group following PVI (before: 51.82 (48.41; 54.03)%; after: 52.49 (50.34; 55.62)%; p = 0.007). Conclusions: Patients with AF showed altered ocular perfusion as measured using OCTA when compared with healthy controls. Rhythm control using PVI significantly improved ocular perfusion as measured using OCT-A. Non-contact imaging using OCTA provides novel information about the central global microperfusion of patients with AF.
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Stability of OCT and OCTA in the Intensive Therapy Unit Setting. Diagnostics (Basel) 2021; 11:diagnostics11081516. [PMID: 34441449 PMCID: PMC8394026 DOI: 10.3390/diagnostics11081516] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 08/03/2021] [Accepted: 08/13/2021] [Indexed: 11/23/2022] Open
Abstract
To assess the stability of retinal structure and blood flow measures over time and in different clinical settings using portable optical coherence tomography angiography (OCTA) as a potential biomarker of central perfusion in critical illness, 18 oesophagectomy patients completed retinal structure and blood flow measurements by portable OCT and OCTA in the eye clinic and intensive therapy unit (ITU) across three timepoints: (1) pre-operation in a clinic setting; (2) 24–48 h post-operation during ITU admission; and (3) seven days post-operation, if the patient was still admitted. Blood flow and macular structural measures were stable between the examination settings, with no consistent variation between pre- and post-operation scans, while retinal nerve fibre layer thickness increased in the post-operative scans (+2.31 µm, p = 0.001). Foveal avascular zone (FAZ) measurements were the most stable, with an intraclass correlation coefficient of up to 0.92 for right eye FAZ area. Blood flow and structural measures were lower in left eyes than right eyes. Retinal blood flow assessed in patients before and during an ITU stay using portable OCTA showed no systematic differences between the clinical settings. The stability of retinal blood flow measures suggests the potential for portable OCTA to provide clinically useful measures in ITU patients.
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Visualization of three-dimensional microcirculation of rodents' retina and choroid for studies of critical illness using optical coherence tomography angiography. Sci Rep 2021; 11:14302. [PMID: 34253747 PMCID: PMC8275781 DOI: 10.1038/s41598-021-93631-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Accepted: 06/08/2021] [Indexed: 02/06/2023] Open
Abstract
We developed a method to measure the relative blood flow speed using optical coherence tomography angiography (OCTA) in retina and choroid, and investigated the feasibility of this method for assessing microcirculatory function in rat models of sepsis and hemorrhagic shock. Two sepsis models, 6-h severe sepsis without treatment and 30-h moderate sepsis maintaining mean arterial pressure, and volume controlled hemorrhagic shock and fluid resuscitation model were used to see the change of microcirculation. The blood flow index (BFI), which was calculated from the OCTA images to represent the average relative blood flow, was decreasing during the 6-h severe sepsis model. Its change is in parallel with the mean arterial blood pressure (MAP) and blood lactate levels. In the 30-h moderate sepsis model, the BFI was decreased while maintaining MAP, and lactate was increased. In the hemorrhagic shock model, the change of BFI is in line with MAP and lactate levels. In all models, BFI change is more sensitive in choroid than in retina. This study presents the OCTA-based retinal and choroidal microcirculatory blood flow monitoring method and shows its utility for assessment of critical illness.
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Ocular perfusion in patients with reduced left ventricular ejection fraction measured by optical coherence tomography angiography. Graefes Arch Clin Exp Ophthalmol 2021; 259:3605-3611. [PMID: 34236473 DOI: 10.1007/s00417-021-05253-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 05/15/2021] [Accepted: 05/19/2021] [Indexed: 10/20/2022] Open
Abstract
AIMS The aim of this study is to evaluate retinal and optic nerve head (ONH) perfusion in patients with systolic chronic heart failure (CHF) compared to healthy control subjects. METHODS Twenty-seven eyes of 27 patients with CHF (study group) and 31 eyes of 31 healthy subjects (control group) were prospectively included in this study. CHF Patients had a left ventricular ejection fraction (LVEF) < 50% and were classified by New York Heart Association (NYHA) class. OCT-A was performed using RTVue XR Avanti with AngioVue (Optovue, Inc, Fremont, CA, USA). The area of the foveal avascular zone (FAZ) and flow density (FD) data were extracted and analyzed. RESULTS There was no significant difference in the signal strength index between the study group (group 1) and the control group (group 2) (ONH: p = 0.015; macula: p = 0.703). The difference in the area of the foveal avascular zone between the two groups was also not significant (p = 0.726). The flow density (whole en face) in the ONH (RPC) in group 1 was significantly lower compared to control (group 1 = 48.40 ± 2.48 (49.0 [46.7, 50.3]); group 2 = 50.15 ± 1.85 (50.6 [48.5, 51.70]); p = 0.008). There was a significant and strong correlation between LVEF and the macular flow density (whole en face) (superficial: rs = 0.605 deep: rs = 0.425, p < 0.01). CONCLUSIONS Patients with CHF showed reduced flow density compared with healthy controls. The reduced FD correlated with the LVEF and the functional (NYHA) class. Retinal perfusion as measured using OCTA might provide an insight into the global microperfusion and hemodynamic state of heart failure patients.
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Watanabe K, Shiba T, Komatsu T, Sakuma K, Aimoto M, Nagasawa Y, Takahara A, Hori Y. The influence of hemorrhagic shock on ocular microcirculation by obtained by laser speckle flowgraphy in a white rabbit model. Microcirculation 2021; 28:e12716. [PMID: 34008269 DOI: 10.1111/micc.12716] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 02/27/2021] [Accepted: 05/11/2021] [Indexed: 11/29/2022]
Abstract
PURPOSE To clarify the continuous changes in the retinal vessels' and choroid's microcirculation during hemorrhagic shock and resuscitation in a rabbit model. METHODS Hemorrhagic shock by the removal of blood (30 mL) and resuscitation by a blood-return technique was induced in anesthetized male New Zealand White rabbits (n = 10). We evaluated the retinal vessel blood flow (relative flow volume: RFV) and choroidal blood flow (mean blur rate in the choroid area: MBR-CH) by laser speckle flowgraphy (LSFG), with simultaneous measurements of systemic hemodynamics and laboratory parameters. RESULTS RFV and MBR-CH showed significant decreases immediately after the initiation of blood removal and recovered by blood return. The lactate concentration tended to increase from baseline by the blood-removal operation, and it was significantly higher at the end of observation period. The %RFV and %MBR-CH each showed a significant positive correlation with mean arterial blood pressure, cardiac output, carotid blood flow, and central venous pressure. %RFV showed a significant positive correlation with %central venous oxygen saturation and negatively correlated with %lactate. The %hemoglobin did not show a significant correlation with %RFV or %MBR-CH. CONCLUSION This rabbit hemorrhagic shock model confirmed that ocular microcirculation measurements by LSFG feasibly reflect variations in systemic hemodynamics during hemorrhagic shock and recovery.
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Affiliation(s)
- Kento Watanabe
- Department of Ophthalmology, Toho University Graduate School of Medicine, Tokyo, Japan
| | - Tomoaki Shiba
- Department of Ophthalmology, Toho University Graduate School of Medicine, Tokyo, Japan.,Department of Ophthalmology, International University of Health and Welfare Narita Hospital, Chiba, Japan
| | - Tetsuya Komatsu
- Department of Ophthalmology, Toho University Graduate School of Medicine, Tokyo, Japan
| | - Kiyoshi Sakuma
- Department of Pharmacology and Therapeutics, Faculty of Pharmaceutical Sciences, Toho University, Chiba, Japan
| | - Megumi Aimoto
- Department of Pharmacology and Therapeutics, Faculty of Pharmaceutical Sciences, Toho University, Chiba, Japan
| | - Yoshinobu Nagasawa
- Department of Pharmacology and Therapeutics, Faculty of Pharmaceutical Sciences, Toho University, Chiba, Japan
| | - Akira Takahara
- Department of Pharmacology and Therapeutics, Faculty of Pharmaceutical Sciences, Toho University, Chiba, Japan
| | - Yuichi Hori
- Department of Ophthalmology, Toho University Graduate School of Medicine, Tokyo, Japan
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13
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Alnawaiseh M, Leclaire MD, Eter N. [Optical coherence tomography angiography (OCT-A) : Overview of the technique and the possible clinical and scientific applications]. Ophthalmologe 2021; 118:617-629. [PMID: 33881588 DOI: 10.1007/s00347-021-01375-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/15/2021] [Indexed: 11/29/2022]
Abstract
Optical coherence tomography angiography (OCT-A) is a very promising noninvasive imaging modality. For the first time it enables a precise 3‑dimensional depiction of the retinal microcirculation without the use of contrast medium and can be carried out rapidly and simply. This makes OCT‑A interesting for both scientific and clinical applications. In many ophthalmological diseases, such as glaucoma and diabetic retinopathy, OCT‑A can detect vascular alterations even in the early stages of the disease. These alterations partially correlate with functional parameters. The use of OCT‑A in the clinical routine is currently still limited due to imaging artifacts, high acquisition costs and large amounts of data; however, the scientific interest in this new technology is enormous and from our point of view it will become established in the clinical routine in the future.
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Affiliation(s)
- Maged Alnawaiseh
- Klinik für Augenheilkunde, Klinikum Fulda, Campus Fulda, Universitätsmedizin Marburg, Pacelliallee 4, 36043, Fulda, Deutschland.
| | | | - Nicole Eter
- Klinik für Augenheilkunde, Universitätsklinikum Münster, Münster, Deutschland
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14
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Assessment of ocular blood flow in continuous-flow ventricular assist device by laser speckle flowgraphy. J Artif Organs 2021; 24:419-424. [PMID: 33825101 DOI: 10.1007/s10047-021-01265-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Accepted: 03/25/2021] [Indexed: 12/16/2022]
Abstract
Although the influence of continuous-flow left ventricular assist device (CF-LVAD) support on peripheral circulation has been widely discussed, its monitoring modalities are limited. The aim of this study was to assess the peripheral circulation using the laser speckle flowgraph (LSFG) which can quantitatively measure the ocular blood flow. We implanted a centrifugal CF-LVAD (EVAHEART®; Sun Medical Technology Research Corporation, Nagano, Japan) in five adult goats (body weight 44.5 ± 2.9 kg) under general anesthesia. The waveform of the central retinal artery using the mean blur rate (MBR) for ocular blood velocity and fluctuations as a parameter of pulsatility were obtained before LVAD implantation and after LVAD full-bypass support. The MBR waveform and LSFG fluctuation data were compared with the waveform and pulsatility index of the external carotid artery using an ultrasonic flow meter to evaluate circulatory patterns at different levels. The MBR waveform pattern of the central retinal artery was pulsatile before LVAD implantation and less pulsatile under LVAD full bypass. The fluctuation was 14.7 ± 1.86 before LVAD implantation and 3.85 ± 0.61 under LVAD full bypass (p < 0.01), respectively. The fluctuations of LSFG showed a strong correlation with the pulsatility index of the external carotid artery meaning that similar changes in circulatory pattern were observed at two different levels. Measuring the ocular blood flow using LSFG has potential utility for the assessment of the status of the peripheral circulation and its pulsatility during CF-LVAD.
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15
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Fasolino G, Awada G, Koulalis JS, Neyns B, Van Elderen P, Kuijpers RW, Nelis P, Ten Tusscher M. Choriocapillaris Assessment In Patients Under Mek-Inhibitor Therapy For Cutaneous Melanoma: An Optical Coherence Tomography Angiography Study. Semin Ophthalmol 2021; 36:765-771. [PMID: 33755528 DOI: 10.1080/08820538.2021.1903512] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
PURPOSE The present study investigates by optical coherence tomography angiography (OCTA) the retinal capillary plexus and choriocapillaris flow voids and their possible correlation with MEKAR. METHODS 34 eyes of 17 patients (61.5 years [30.4-77.4]) with stage IV cutaneous melanoma were included prospectively. All patients showed disease progression under treatment with Nivolumab/Ipilimumab and were subsequently treated with the MEK-inhibitor Trametinib 2 mg once daily. At the start and every 6 weeks during follow-up of 4 months, patients underwent a complete ophthalmologic exam, OCTA and when needed fluorescein angiography. RESULTS Statistical analysis was performed on 17 eyes of 9 patients. Eight patients were excluded due to missing OCTA images or due to drop-out because of decease or change of treatment. Comparing vessel area density (P = .625 and 0.681, respectively), vessel skeleton density (P = .996 and 0.766, respectively) of the superficial and deep capillary plexus, flow void number and total flow void area (mm2 and %) (P = .495; 0.197 and 0.298, respectively) of choriocapillaris slab, before and after treatment, revealed no significant difference. The evolution of choriocapillaris flow void parameter did not significantly differ in patients, who developed MEKAR compared to patients who did not. CONCLUSION In patients receiving MEK-inhibitor with and without MEKAR, no significant different characteristics of the retinal capillary plexus and choriocapillaris were found. These data suggest that the development of MEKAR, has no correlation with vascular alteration.
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Affiliation(s)
- Giuseppe Fasolino
- Department of Ophthalmology, Vrije Universiteit Brussel, Brussels, Belgium
| | - Gil Awada
- Department of Oncology, Vrije Universiteit Brussel, Brussels, Belgium
| | | | - Bart Neyns
- Department of Oncology, Vrije Universiteit Brussel, Brussels, Belgium
| | - Peter Van Elderen
- Department of Ophthalmology, Vrije Universiteit Brussel, Brussels, Belgium
| | - Robert W Kuijpers
- Department of Ophthalmology, Vrije Universiteit Brussel, Brussels, Belgium
| | - Pieter Nelis
- Department of Ophthalmology, Vrije Universiteit Brussel, Brussels, Belgium.,Department of Ophthalmology, University of Muenster Medical Center, Muenster, Germany
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16
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[Optical coherence tomography angiography and cardiovascular diseases. An overview of the current knowledge]. Ophthalmologe 2021; 118:1119-1127. [PMID: 33616736 PMCID: PMC8568759 DOI: 10.1007/s00347-021-01336-1] [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: 11/09/2020] [Revised: 12/23/2020] [Accepted: 01/26/2021] [Indexed: 11/24/2022]
Abstract
Hintergrund Kardiovaskuläre Erkrankungen (KVE) sind die Haupttodesursache weltweit. Die Beobachtbarkeit von Veränderungen der retinalen Gefäße im Zusammenhang mit KVE mittels Fundoskopie ist schon seit Langem bekannt. Ein neuartiges Verfahren zur nichtinvasiven und detaillierten Darstellung und Quantifizierung der retinalen und papillären Gefäße stellt die optische Kohärenztomographie-Angiographie (OCT-A) dar. Durch die OCT‑A ist es möglich, Gefäßveränderungen einfach und gut reproduzierbar zu visualisieren, weswegen ihr Einsatz nicht nur auf augenärztliche Fragestellungen beschränkt ist. In den vergangenen Jahren sind einige experimentelle und klinische Studien zur Darstellbarkeit und Quantifizierung von Gefäßveränderungen durch die OCT‑A bei Erkrankungen des kardiovaskulären Spektrums publiziert worden. In der vorliegenden Übersicht werden die wichtigsten Erkenntnisse aus diesen Studien zusammengefasst. Methoden Grundlage dieser Arbeit bilden eine umfassende selektive Literaturrecherche und die Darstellung eigener Daten. Ergebnisse Mittlerweile liegen zu vielen Erkrankungen des kardiovaskulären Spektrums OCT-A-Studien vor, die verdeutlichen, dass systemische Gefäßerkrankungen mit Veränderungen der retinalen Mikrozirkulation verbunden sind. Mit der OCT‑A können diese Veränderungen visualisiert und reproduzierbar quantifiziert werden. Oftmals ist es möglich, subklinische Veränderungen aufzuzeigen, bevor die zugrunde liegende Erkrankung anderweitig messbare Veränderungen oder für den Patienten merkbare Symptome verursacht. Schlussfolgerung Die OCT‑A ist eine vielversprechende Bildgebungsmethode auf dem Gebiet der KVE in Wissenschaft und klinischer Anwendung. Sie kann zur Diagnostik und Quantifizierung retinaler Gefäßveränderungen eingesetzt werden. Weitere Studien werden zeigen, ob die OCT‑A bei der Einschätzung des individuellen kardiovaskulären Risikoprofils helfen kann.
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17
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Zhang W, Li L, Zou D, Ren Q, Zhang Y, Kang L, Gu X, Wu H, Zhang S, Zhu R, Zhang Y, Yang L. Retinal vessel oxygen saturation in patients with unilateral internal carotid artery stenosis: a pilot study. Acta Ophthalmol 2021; 99:e13-e18. [PMID: 32519804 DOI: 10.1111/aos.14503] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2019] [Accepted: 05/17/2020] [Indexed: 12/30/2022]
Abstract
PURPOSE To investigate the retinal vessel oxygen saturation in patients with internal carotid artery stenosis (ICAS). METHODS This is a cross-sectional study. Sixteen patients with unilateral moderate or worse ICAS (≥50%) and no fundus diseases were included in the study. Sixteen gender- and age-matched healthy subjects were selected as controls. The mean oxygen saturation and vessel diameters of the retinal arterioles and venules were obtained using a dual-wavelength spectrophotometric retinal oximeter. RESULTS In the eye of the stenotic side, the retinal vessel oxygen saturation was 100.14 ± 10.27% in the arterioles and 56.50 ± 10.79% in the venules, and the arteriovenous (A-V) difference was 43.63 ± 7.71%. In the eye of the contralateral side, the oxygen saturation was 96.55 ± 7.50% in the arterioles and 57.42 ± 9.84% in the venules, and the A-V difference was 39.39 ± 6.33%. In healthy subjects, the oxygen saturation was 93.22 ± 5.98% in the arterioles and 56.57 ± 7.05% in the venules, and the A-V difference was 36.65 ± 7.33%. The arteriolar oxygen saturation in the stenotic side was higher than that in the contralateral side (p = 0.025) and that in the healthy subjects (p = 0.027), and the A-V difference in the stenotic side was significantly higher than that in the contralateral side (p = 0.009) and that in the healthy subjects (p = 0.013). The diameters of the arterioles in the stenotic side were smaller than those in the healthy subjects (p = 0.030). CONCLUSIONS Patients with ICAS had decreased retinal arteriole diameters and increased retinal vessel oxygen saturation in the arterioles and A-V differences, suggesting the presence of microcirculation disorder and hyperoxia in the retina.
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Affiliation(s)
- Wenbo Zhang
- Department of Ophthalmology Peking University First Hospital Beijing China
| | - Liangliang Li
- Department of Ultrasonography Peking University First Hospital Beijing China
| | - Da Zou
- Department of Biomedical Engineering College of Engineering Peking University Beijing China
| | - Qiushi Ren
- Department of Biomedical Engineering College of Engineering Peking University Beijing China
| | - Yadi Zhang
- Department of Ophthalmology Peking University First Hospital Beijing China
| | - Lei Kang
- Department of Ophthalmology Peking University First Hospital Beijing China
| | - Xiaopeng Gu
- Department of Ophthalmology Peking University First Hospital Beijing China
| | - Hailong Wu
- Department of Ophthalmology Peking University First Hospital Beijing China
| | - Shijie Zhang
- Department of Ophthalmology Peking University First Hospital Beijing China
| | - Ruilin Zhu
- Department of Ophthalmology Peking University First Hospital Beijing China
| | - Yanzhen Zhang
- Department of Ophthalmology Peking University First Hospital Beijing China
| | - Liu Yang
- Department of Ophthalmology Peking University First Hospital Beijing China
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18
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Courtie E, Veenith T, Logan A, Denniston AK, Blanch RJ. Retinal blood flow in critical illness and systemic disease: a review. Ann Intensive Care 2020; 10:152. [PMID: 33184724 PMCID: PMC7661622 DOI: 10.1186/s13613-020-00768-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Accepted: 10/23/2020] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND Assessment and maintenance of end-organ perfusion are key to resuscitation in critical illness, although there are limited direct methods or proxy measures to assess cerebral perfusion. Novel non-invasive methods of monitoring microcirculation in critically ill patients offer the potential for real-time updates to improve patient outcomes. MAIN BODY Parallel mechanisms autoregulate retinal and cerebral microcirculation to maintain blood flow to meet metabolic demands across a range of perfusion pressures. Cerebral blood flow (CBF) is reduced and autoregulation impaired in sepsis, but current methods to image CBF do not reproducibly assess the microcirculation. Peripheral microcirculatory blood flow may be imaged in sublingual and conjunctival mucosa and is impaired in sepsis. Retinal microcirculation can be directly imaged by optical coherence tomography angiography (OCTA) during perfusion-deficit states such as sepsis, and other systemic haemodynamic disturbances such as acute coronary syndrome, and systemic inflammatory conditions such as inflammatory bowel disease. CONCLUSION Monitoring microcirculatory flow offers the potential to enhance monitoring in the care of critically ill patients, and imaging retinal blood flow during critical illness offers a potential biomarker for cerebral microcirculatory perfusion.
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Affiliation(s)
- E Courtie
- Neuroscience and Ophthalmology, Institute of Inflammation and Ageing, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
- Ophthalmology Department, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
- NIHR Surgical Reconstruction and Microbiology Research Centre, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | - T Veenith
- Critical Care Unit, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
- Birmingham Acute Care Research Group, Institute of Inflammation and Ageing, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
| | - A Logan
- Axolotl Consulting Ltd, Droitwich, WR9 0JS, Worcestershire, UK
- Division of Biomedical Sciences, Warwick Medical School, University of Warwick, Coventry, CV4 7HL, UK
| | - A K Denniston
- Neuroscience and Ophthalmology, Institute of Inflammation and Ageing, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK
- Ophthalmology Department, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
- NIHR Biomedical Research Centre for Ophthalmology, Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, London, UK
- Centre for Rare Diseases, Institute of Translational Medicine, Birmingham Health Partners, Birmingham, UK
| | - R J Blanch
- Neuroscience and Ophthalmology, Institute of Inflammation and Ageing, College of Medical and Dental Sciences, University of Birmingham, Birmingham, UK.
- Ophthalmology Department, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK.
- NIHR Surgical Reconstruction and Microbiology Research Centre, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK.
- Academic Department of Military Surgery and Trauma, Royal Centre for Defence Medicine, Birmingham, UK.
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19
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Lange PS, Lahme L, Esser E, Frommeyer G, Fischer AJ, Bode N, Höwel D, Mihailovic N, Hessler M, Eter N, Eckardt L, Rosenberger F, Alnawaiseh M. Reduced flow density in patients with atrial fibrillation measured using optical coherence tomography angiography. Acta Ophthalmol 2020; 98:e789-e790. [PMID: 32346984 DOI: 10.1111/aos.14431] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 03/13/2020] [Indexed: 11/30/2022]
Affiliation(s)
- Philipp Sebastian Lange
- Division of Electrophysiology Department of Cardiovascular Medicine University of Muenster Medical Center Muenster Germany
| | - Larissa Lahme
- Department of Ophthalmology University of Muenster Medical Center Muenster Germany
| | - Eliane Esser
- Department of Ophthalmology University of Muenster Medical Center Muenster Germany
| | - Gerrit Frommeyer
- Division of Electrophysiology Department of Cardiovascular Medicine University of Muenster Medical Center Muenster Germany
| | - Alicia J. Fischer
- Division of Electrophysiology Department of Cardiovascular Medicine University of Muenster Medical Center Muenster Germany
| | - Niklas Bode
- Division of Electrophysiology Department of Cardiovascular Medicine University of Muenster Medical Center Muenster Germany
| | - Dennis Höwel
- Division of Electrophysiology Department of Cardiovascular Medicine University of Muenster Medical Center Muenster Germany
| | - Natasa Mihailovic
- Department of Ophthalmology University of Muenster Medical Center Muenster Germany
| | - Michael Hessler
- Department of Anesthesiology Intensive Care and Pain Therapy University of Muenster Medical Center Muenster Germany
| | - Nicole Eter
- Department of Ophthalmology University of Muenster Medical Center Muenster Germany
| | - Lars Eckardt
- Division of Electrophysiology Department of Cardiovascular Medicine University of Muenster Medical Center Muenster Germany
| | | | - Maged Alnawaiseh
- Department of Ophthalmology University of Muenster Medical Center Muenster Germany
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20
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Hessler M, Nelis P, Ertmer C, Alnawaiseh M, Lehmann F, Schmidt C, Kampmeier TG, Rehberg SW, Arnemann PH, Rovas A. Optical coherence tomography angiography as a novel approach to contactless evaluation of sublingual microcirculation: A proof of principle study. Sci Rep 2020; 10:5408. [PMID: 32214141 PMCID: PMC7096522 DOI: 10.1038/s41598-020-62128-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Accepted: 03/03/2020] [Indexed: 01/06/2023] Open
Abstract
Microcirculatory disorders are crucial in pathophysiology of organ dysfunction in critical illness. Evaluation of sublingual microcirculation is not routinely conducted in daily practice due to time-consuming analysis and susceptibility to artifacts. We investigated the suitability of optical coherence tomography angiography (OCTA) for contactless evaluation of sublingual microcirculation. Sublingual microcirculation was imaged in 10 healthy volunteers, using an OCTA device and an incident dark field (IDF) illumination microscopy (current gold standard). OCTA images were analyzed with regard to flow density and perfused vessel density (PVDbyOCTA). IDF videos were analyzed following current recommendations. Flow density was automatically extracted from OCTA images (whole en face 48.9% [43.2; 54.5]; central ring 52.6% [43.6; 60.6]). PVDbyOCTA did not differ from the PVD calculated from IDF videos (PVDbyOCTA 18.6 mm/mm² [18.0; 21.7]) vs. PVDbyIDF 21.0 mm/mm² [17.5; 22.9]; p = 0.430). Analysis according to Bland-Altman revealed a mean bias of 0.95 mm/mm² (95% Confidence interval −1.34 to 3.25) between PVDbyOCTA and PVDbyIDF with limits of agreement of −5.34 to 7.24 mm/mm². This study is the first to demonstrate the suitability of OCTA for evaluating sublingual microcirculation. Comparison of the perfused vessel density between methods showed a plausible level of agreement.
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Affiliation(s)
- Michael Hessler
- Department of Anesthesiology, Intensive Care, and Pain Therapy, University Hospital Muenster, Albert-Schweitzer-Campus 1, Building A1, Muenster, Germany
| | - Pieter Nelis
- Department of Ophthalmology, University Hospital Muenster, Domagkstraße 15, Muenster, Germany.,Department of Ophthalmology, University of Brussels (VUB), Laarbeeklaan 101, Jette, Belgium
| | - Christian Ertmer
- Department of Anesthesiology, Intensive Care, and Pain Therapy, University Hospital Muenster, Albert-Schweitzer-Campus 1, Building A1, Muenster, Germany.
| | - Maged Alnawaiseh
- Department of Ophthalmology, University Hospital Muenster, Domagkstraße 15, Muenster, Germany
| | - Florian Lehmann
- Department of Anesthesiology, Intensive Care, and Pain Therapy, University Hospital Muenster, Albert-Schweitzer-Campus 1, Building A1, Muenster, Germany
| | - Christina Schmidt
- Department of Anesthesiology, Intensive Care, and Pain Therapy, University Hospital Muenster, Albert-Schweitzer-Campus 1, Building A1, Muenster, Germany
| | - Tim-Gerald Kampmeier
- Department of Anesthesiology, Intensive Care, and Pain Therapy, University Hospital Muenster, Albert-Schweitzer-Campus 1, Building A1, Muenster, Germany
| | - Sebastian Willy Rehberg
- Department of Anesthesiology, Intensive Care, Emergency Medicine, Transfusion Medicine and Pain Therapy, Protestant Hospital of the Bethel Foundation, Burgsteig, Bielefeld, Germany
| | - Philip-Helge Arnemann
- Department of Anesthesiology, Intensive Care, and Pain Therapy, University Hospital Muenster, Albert-Schweitzer-Campus 1, Building A1, Muenster, Germany
| | - Alexandros Rovas
- Department of Medicine D, Division of General Internal Medicine, Nephrology, and Rheumatology, University Hospital Muenster, Albert-Schweitzer-Campus 1, Muenster, Germany
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21
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Quantitative analysis of retinal and choroidal microvascular parameters using optical coherence tomography angiography in children with nephrotic syndrome: a pilot study. Graefes Arch Clin Exp Ophthalmol 2019; 258:289-296. [PMID: 31838707 DOI: 10.1007/s00417-019-04561-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Revised: 10/31/2019] [Accepted: 12/03/2019] [Indexed: 12/13/2022] Open
Abstract
PURPOSE To study the retinal and choroidal microvascular parameters in children with nephrotic syndrome (NS). METHODS This is a cross-sectional study. Optical coherence tomography angiography was used to evaluate the changes of retinal and choroidal microvessels in patients with NS. Thirty NS children and 20 normal controls were included in this study. The macular vessel density (VD) of the superficial capillary plexus (SCP), deep capillary plexus (DCP), choroid capillary plexus (CCP), and foveal avascular zone (FAZ) area of the SCP and DCP was quantitatively calculated. Clinical data including serum protein, blood lipid, uric acid, urea, serum creatinine, urinary protein concentration, urinary creatinine, 24-h urine volume, 24-h urinary total protein, 24-h creatinine clearance rate, and urinary albumin to creatinine ratio were collected. RESULTS The VDs of the DCP and CCP in children with NS were significantly lower than those in controls (59.35 ± 2.45 vs. 61.15 ± 1.53, p = 0.002, 66.34 ± 1.43 vs. 67.16 ± 1.23, p = 0.042, respectively). The VD of the SCP in children with NS had a tendency to decrease compared with that in controls, but there were no significant differences. There were also no significant differences in FAZ area between the two groups. The VD of the SCP was positively correlated with serum total protein (ρ = 0.446, p = 0.014), serum albumin (ρ = 0.431, p = 0.017), and 24-h urine volume (ρ = 0.389, p = 0.034) but negatively correlated with triglyceride (ρ = - 0.450, p = 0.013), low-density lipoprotein cholesterol (ρ = -0.432, p = 0.017), urinary protein concentration (ρ = - 0.606, p < 0.001), and 24-h urinary total protein (ρ = - 0.517, p = 0.004). The VDs of the SCP, DCP, and CCP were negatively correlated with the urinary albumin to creatinine ratio (ρ = - 0.473, p = 0.008, ρ = - 0.438, p = 0.015, ρ = -0.467, p = 0.009, respectively). CONCLUSIONS Retinal and choroidal VDs were decreased in children with NS and paralleled the severity of kidney disease. Optical coherence tomography angiography can be used as a noninvasive method for evaluating renal injury in patients with NS.
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22
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Brücher VC, Storp JJ, Eter N, Alnawaiseh M. Optical coherence tomography angiography-derived flow density: a review of the influencing factors. Graefes Arch Clin Exp Ophthalmol 2019; 258:701-710. [PMID: 31820079 DOI: 10.1007/s00417-019-04553-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 11/18/2019] [Accepted: 11/21/2019] [Indexed: 01/09/2023] Open
Abstract
Research interest in the possibility of quantifying macular and optic nerve head perfusion through optical coherence tomography angiography (OCTA) is rapidly advancing. Numerous scientific trials have furthered our understanding of the capabilities and the limitations of this novel technology, while applying OCTA to various ocular pathologies. In recent years, different parameters such as age, gender, intraocular pressure, spherical equivalent, physical activity, systemic diseases, and medication have been shown to have a significant impact on quantitative OCTA metrics. Since OCTA is likely to remain a "hot topic" in the near future, it is crucial to be aware of influencing factors in order to ensure correct interpretation of imaging results. This article reviews the factors currently known to influence flow density (FD) as measured by OCTA in healthy eyes.
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Affiliation(s)
- Viktoria C Brücher
- Department of Ophthalmology, University of Muenster Medical Center, Albert-Schweitzer-Campus 1, Building D15, 48149, Muenster, Germany.
| | - Jens J Storp
- Department of Ophthalmology, University of Muenster Medical Center, Albert-Schweitzer-Campus 1, Building D15, 48149, Muenster, Germany
| | - Nicole Eter
- Department of Ophthalmology, University of Muenster Medical Center, Albert-Schweitzer-Campus 1, Building D15, 48149, Muenster, Germany
| | - Maged Alnawaiseh
- Department of Ophthalmology, University of Muenster Medical Center, Albert-Schweitzer-Campus 1, Building D15, 48149, Muenster, Germany
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Lahme L, Esser EL, Mihailovic N, Schubert F, Lauermann J, Johnen A, Eter N, Duning T, Alnawaiseh M. Evaluation of Ocular Perfusion in Alzheimer's Disease Using Optical Coherence Tomography Angiography. J Alzheimers Dis 2019; 66:1745-1752. [PMID: 30507577 DOI: 10.3233/jad-180738] [Citation(s) in RCA: 76] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
BACKGROUND There is increasing evidence for the involvement of cerebrovascular factors in Alzheimer's disease (AD). OBJECTIVE To evaluate retinal and optic nerve head perfusion in patients with AD using optical coherence tomography angiography (OCTA), and to analyze the correlations of quantitative OCTA metrics with AD pathology and vascular cerebral lesions in AD patients. METHODS 36 eyes of 36 patients with AD (study group) and 38 eyes of 38 healthy subjects (control group) were prospectively included in this study. OCTA was performed using RTVue XR Avanti with AngioVue. In addition, patients underwent a detailed ophthalmological and neurological examination including Mini-Mental State Examination, cerebral magnetic resonance imaging, and amyloid-β (Aβ) and tau levels in the cerebrospinal fluid (CSF). RESULTS The flow density in the superficial retinal OCT angiogram of the macula in the study group was significantly lower compared to the control group (p = 0.001). There was a significant correlation between the flow density in the superficial retinal OCT angiogram of the macula, as measured using OCTA, and the Fazekas scale (Spearman's correlation coefficient = -0.520; p = 0.003). There was no significant correlation between the Aβ or tau levels in the CSF and the flow density data. CONCLUSION Patients with AD showed a reduced flow density in the radial peripapillary capillaries layer and in the superficial retinal OCT angiogram when compared with healthy controls. The reduced retinal flow density measured using OCTA is not specifically associated with AD pathology but is associated with the vascular cerebral lesions in AD.
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Affiliation(s)
- Larissa Lahme
- Department of Ophthalmology, University of Muenster Medical Center, Muenster, Germany
| | - Eliane Luisa Esser
- Department of Ophthalmology, University of Muenster Medical Center, Muenster, Germany
| | - Natasa Mihailovic
- Department of Ophthalmology, University of Muenster Medical Center, Muenster, Germany
| | - Friederike Schubert
- Department of Ophthalmology, University of Muenster Medical Center, Muenster, Germany
| | - Jost Lauermann
- Department of Ophthalmology, University of Muenster Medical Center, Muenster, Germany
| | - Andreas Johnen
- Department of Neurology, University Hospital Münster, Münster, Germany
| | - Nicole Eter
- Department of Ophthalmology, University of Muenster Medical Center, Muenster, Germany
| | - Thomas Duning
- Department of Neurology, University Hospital Münster, Münster, Germany
| | - Maged Alnawaiseh
- Department of Ophthalmology, University of Muenster Medical Center, Muenster, Germany
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Lauermann JL, Xu Y, Heiduschka P, Treder M, Alten F, Eter N, Alnawaiseh M. Impact of integrated multiple image averaging on OCT angiography image quality and quantitative parameters. Graefes Arch Clin Exp Ophthalmol 2019; 257:2623-2629. [PMID: 31630231 DOI: 10.1007/s00417-019-04492-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 08/26/2019] [Accepted: 09/16/2019] [Indexed: 11/29/2022] Open
Abstract
PURPOSE Multiple image averaging (MIA) is a new approach to improve OCT angiography (OCTA) imaging. The aim of this work was to analyze the impact of MIA on image quality and quantitative OCTA parameters. METHODS Twenty eyes from 20 healthy volunteers (55.65 ± 14.8 years) were prospectively enrolled. Imaging was performed using two commercially available OCTA devices (Canon OCT HS-100, Optovue AngioVue) using a uniform imaging protocol. Each participant had two single scans of the macula (3 × 3mm, Canon and Optovue) as well as five continuous single scan imaging procedures (3 × 3mm each) using the Canon device. Three out of five of these images with highest quality were manually chosen and then automatically processed by the Canon device using MIA. The superficial retinal plexus of the single scans and of MIA images was analyzed with regard to the device' own image quality scores (IQS), peak signal-to-noise ratio (PSNR), the size of the foveolar avascular zone (FAZ), and vessel density (VD). Image acquisition times were recorded. Parameters were compared between the devices and the different imaging protocols. RESULTS Average acquisition time was significantly higher for the MIA compared with the single measurements (29.09 ± 10.19 seconds (s) (MIA) vs. 5.56 ± 2.17 s (Canon single scan) vs. 20.28 ± 6.81 s (Optovue) (p < 0.001)). IQS showed no significant differences between the devices and between the recording protocols. PSNR was 12.38 ± 0.20 (Canon single scan), 13.01 ± 0.36 (Canon MIA), and 14.34 ± 0.60 (Optovue) (p < 0.001 between the groups). Mean FAZ area in Canon single scans was 0.29 ± 0.06 mm2, 0.27 ± 0.07 mm2 using MIA, and 0.27 ± 0.08 mm2 using the Optovue device. There was no significant difference between mean FAZ measurements before and after averaging (Canon single scan vs. MIA, p = 0.168). VD of the parafoveal area using MIA was significantly lower compared with both single scans (p < 0.001). CONCLUSIONS MIA can improve PSNR, but it also reduces imaging speed and significantly affects VD measurements. Therefore, when comparing OCTA data, the use of uniform imaging protocols is required.
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Affiliation(s)
- Jost L Lauermann
- Department of Ophthalmology, University of Muenster Medical Center, Domagkstrasse 15, 48149, Muenster, Germany.
| | - Y Xu
- Department of Ophthalmology, University of Muenster Medical Center, Domagkstrasse 15, 48149, Muenster, Germany
| | - P Heiduschka
- Department of Ophthalmology, University of Muenster Medical Center, Domagkstrasse 15, 48149, Muenster, Germany
| | - M Treder
- Department of Ophthalmology, University of Muenster Medical Center, Domagkstrasse 15, 48149, Muenster, Germany
| | - F Alten
- Department of Ophthalmology, University of Muenster Medical Center, Domagkstrasse 15, 48149, Muenster, Germany
| | - N Eter
- Department of Ophthalmology, University of Muenster Medical Center, Domagkstrasse 15, 48149, Muenster, Germany
| | - M Alnawaiseh
- Department of Ophthalmology, University of Muenster Medical Center, Domagkstrasse 15, 48149, Muenster, Germany
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Brücher VC, Storp JJ, Kerschke L, Nelis P, Eter N, Alnawaiseh M. Influence of mydriasis on optical coherence tomography angiography imaging in patients with age-related macular degeneration. PLoS One 2019; 14:e0223452. [PMID: 31584983 PMCID: PMC6777775 DOI: 10.1371/journal.pone.0223452] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Accepted: 09/20/2019] [Indexed: 01/08/2023] Open
Abstract
Purpose To evaluate the effect of topical mydriatic eye drops on optical coherence tomography angiography (OCTA) parameters in patients with age-related macular degeneration (AMD). Methods 27 eyes of 27 patients suffering from AMD were included in this cross-sectional study. Patients with ≥-4.5 diopters spherical equivalent, corneal opacities or dense cataract preventing high-quality imaging were excluded. Whole-en-face scans of the superficial capillary plexus (SCP) and deep capillary plexus (DCP) in the central 3x3mm foveal region as well as whole-en-face and peripapillary scans of the radial peripapillary capillaries (RPC) were generated using OCTA (AngioVue®, Optovue). Imaging was first conducted with patients’ eyes in miosis, then in mydriasis after instillation of a dilating eye drop (0.5% tropicamide, 2.5% phenylephrine-HCl). Main outcome measures were flow density (FD), foveal avascular zone (FAZ), signal strength index (SSI) and motion artifact score (MAS). Results Our results reveal that in AMD patients there is no significant difference between FD measurements taken in miosis and those taken in mydriasis around the SCP (p = 0.198), DCP (p = 0.458), RPC whole-en-face (p = 0.275) and RPC peripapillary (p = 0.503). Measurements taken in these two states appear to be equivalent for assessment of FD (90%CI within ± 0.05). No significant difference was found either in the area of the FAZ (p = 0.338) or in the SSI (p = 0.371) before and after the instillation of tropicamide/phenylephrine. MAS was significantly lower after the application of mydriatic eye drops (p = 0.003). Conclusions Our findings reveal that neither measurements of FD nor measurements of the FAZ area changed significantly in AMD patients after the application of tropicamide/phenylephrine. Since MAS improved significantly in dilation, mydriatic examination is recommended. Nevertheless, a comparison of OCTA metrics from images taken with different pupil states (miosis versus mydriasis) is valid for clinical trials.
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Affiliation(s)
- Viktoria C. Brücher
- Department of Ophthalmology, University of Muenster Medical Centre, Muenster, North Rhine-Westphalia, Germany
- * E-mail:
| | - Jens J. Storp
- Department of Ophthalmology, University of Muenster Medical Centre, Muenster, North Rhine-Westphalia, Germany
| | - Laura Kerschke
- Department of Biometry and Clinical Research, University of Muenster Medical Centre, Muenster, North Rhine-Westphalia, Germany
| | - Pieter Nelis
- Department of Ophthalmology, University of Muenster Medical Centre, Muenster, North Rhine-Westphalia, Germany
| | - Nicole Eter
- Department of Ophthalmology, University of Muenster Medical Centre, Muenster, North Rhine-Westphalia, Germany
| | - Maged Alnawaiseh
- Department of Ophthalmology, University of Muenster Medical Centre, Muenster, North Rhine-Westphalia, Germany
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Hessler M, Lehmann F, Arnemann PH, Eter N, Ertmer C, Alnawaiseh M. [Optical coherence tomography angiography in intensive care medicine : A new field of application?]. Ophthalmologe 2019; 116:728-734. [PMID: 31139886 DOI: 10.1007/s00347-019-0893-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND Many critically ill patients show a disturbance of the microcirculation, which is not yet regularly examined in the clinical routine; however, for treatment decisions and estimation of the prognosis it would be important to obtain detailed information about the microcirculation in critically ill patients. Optical coherence tomography angiography (OCTA) is a non-invasive, contact-free technique, which enables visualization of the blood flow in the retinal microcirculation within a few seconds. Therefore, it may have the potential to diagnose microcirculation disorders in critically ill patients. OBJECTIVE The aims of the study were to assess the importance of the microcirculation in intensive care medicine, a comparison of the methods of video microscopy and OCTA and analysis of preclinical and clinical data on the use of OCTA in intensive care medicine. MATERIAL AND METHODS A selective literature review and data analysis were carried out. RESULTS A direct visualization of the microcirculation has been possible for many years with the technique of video microscopy but this has not become established in the clinical routine due to the susceptibility to interferences and a time-consuming manual analysis. The OCTA is a non-invasive and contact-free method for the visualization of retinal blood flow. First preclinical data in septic and hemorrhagic shock show good results of OCTA for analysis of the microcirculation. CONCLUSION The non-invasive technique of OCTA is a promising measurement method to enable bedside analysis of the microcirculation in critically ill paients in the future; however, some technical limitations must still be overcome.
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Affiliation(s)
- Michael Hessler
- Klinik für Anästhesiologie, operative Intensivmedizin und Schmerztherapie, Universitätsklinikum Münster, Albert-Schweitzer-Campus 1, Gebäude A1, 48149, Münster, Deutschland.
| | - Florian Lehmann
- Klinik für Anästhesiologie, operative Intensivmedizin und Schmerztherapie, Universitätsklinikum Münster, Albert-Schweitzer-Campus 1, Gebäude A1, 48149, Münster, Deutschland
| | - Philip-Helge Arnemann
- Klinik für Anästhesiologie, operative Intensivmedizin und Schmerztherapie, Universitätsklinikum Münster, Albert-Schweitzer-Campus 1, Gebäude A1, 48149, Münster, Deutschland
| | - Nicole Eter
- Klinik für Augenheilkunde, Universitätsklinikum Münster, 48149, Münster, Deutschland
| | - Christian Ertmer
- Klinik für Anästhesiologie, operative Intensivmedizin und Schmerztherapie, Universitätsklinikum Münster, Albert-Schweitzer-Campus 1, Gebäude A1, 48149, Münster, Deutschland
| | - Maged Alnawaiseh
- Klinik für Augenheilkunde, Universitätsklinikum Münster, 48149, Münster, Deutschland
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Optische Kohärenztomographie-Angiographie zur Beurteilung der Mikrozirkulation bei systemischen Erkrankungen. Ophthalmologe 2019; 116:712-713. [DOI: 10.1007/s00347-019-0913-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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28
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Alnawaiseh M, Lahme L, Eter N, Mardin C. [Optical coherence tomography angiography: Value for glaucoma diagnostics]. Ophthalmologe 2018; 116:602-609. [PMID: 30413870 DOI: 10.1007/s00347-018-0815-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Optical coherence tomography angiography (OCTA) is a novel noninvasive method which enables a quantitative evaluation of retinal and optic nerve head (ONH) perfusion. In this article, we discuss the principles of the application of OCTA and give a summary of the knowledge gained by using this method in glaucoma patients. METHODS This article is based on a selective literature search and the analysis of own data. RESULTS Quantitative OCTA parameters have a good reproducibility in glaucoma patients. Glaucoma patients show a reduced flow density (FD) in the ONH and in the area of the macula compared with a healthy control group. The FD parameters show a good diagnostic discriminatory power but are not superior to the structural parameters used in routine diagnostics. The reduced FD measured using OCTA correlates with the extent of functional and structural glaucoma damage. CONCLUSION The OCTA is noninvasive, fast and reproducible. Initial results from studies on glaucoma patients show the high diagnostic potential of this method. The OCTA could become a part of clinical glaucoma management in the future.
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Affiliation(s)
- M Alnawaiseh
- Klinik für Augenheilkunde, Universitätsklinikum Münster, Domagkstr. 15, 48149, Münster, Deutschland.
| | - L Lahme
- Klinik für Augenheilkunde, Universitätsklinikum Münster, Domagkstr. 15, 48149, Münster, Deutschland
| | - N Eter
- Klinik für Augenheilkunde, Universitätsklinikum Münster, Domagkstr. 15, 48149, Münster, Deutschland
| | - C Mardin
- Klinik für Augenheilkunde, Universitätsklinikum Erlangen, Erlangen, Deutschland
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