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1.
Proc Natl Acad Sci U S A ; 117(48): 30661-30669, 2020 12 01.
Artículo en Inglés | MEDLINE | ID: mdl-33168747

RESUMEN

Microglia are resident central nervous system macrophages and the first responders to neural injury. Until recently, microglia have been studied only in animal models with exogenous or transgenic labeling. While these studies provided a wealth of information on the delicate balance between neuroprotection and neurotoxicity within which these cells operate, extrapolation to human immune function has remained an open question. Here we examine key characteristics of retinal macrophage cells in live human eyes, both healthy and diseased, with the unique capabilities of our adaptive optics-optical coherence tomography approach and owing to their propitious location above the inner limiting membrane (ILM), allowing direct visualization of cells. Our findings indicate that human ILM macrophage cells may be distributed distinctly, age differently, and have different dynamic characteristics than microglia in other animals. For example, we observed a macular pattern that was sparse centrally and peaked peripherally in healthy human eyes. Moreover, human ILM macrophage density decreased with age (∼2% of cells per year). Our results in glaucomatous eyes also indicate that ILM macrophage cells appear to play an early and regionally specific role of nerve fiber layer phagocytosis in areas of active disease. While we investigate ILM macrophage cells distinct from the larger sample of overall retinal microglia, the ability to visualize macrophage cells without fluorescent labeling in the live human eye represents an important advance for both ophthalmology and neuroscience, which may lead to novel disease biomarkers and new avenues of exploration in disease progression.


Asunto(s)
Macrófagos/metabolismo , Imagen Molecular , Imagen Óptica , Retina/metabolismo , Retina/patología , Biomarcadores , Susceptibilidad a Enfermedades , Glaucoma/diagnóstico , Glaucoma/etiología , Glaucoma/metabolismo , Humanos , Macrófagos/inmunología , Mácula Lútea/metabolismo , Microglía/inmunología , Microglía/metabolismo , Microglía/patología , Imagen Molecular/métodos , Neuroprotección , Imagen Óptica/métodos , Retina/diagnóstico por imagen , Tomografía de Coherencia Óptica
2.
Int Ophthalmol ; 43(1): 285-292, 2023 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-35870049

RESUMEN

PURPOSE: To evaluate the association between postoperative intraocular pressure (IOP) reduction and phacoemulsification parameters in patients who underwent both conventional phacoemulsification surgery (CPS) and femtosecond laser-assisted cataract surgery (FLACS). METHODS: This was a prospective multicenter comparative study that enrolled 90 participants who underwent cataract surgery at the University of Maryland Medical System and the Wilmer Eye Institute. Patients underwent FLACS in one eye and CPS in the fellow eye. IOP was measured prior to surgery and monitored through six months postoperatively. Demographic, clinical, biometric, and intraoperative variables including cumulative dissipated energy (CDE), aspiration time, and phacoemulsification time were analyzed for any significant association with postoperative IOP. Postoperative IOP reduction was the primary outcome variable. A secondary goal of the study was to determine differences in postoperative IOP reduction between CPS and FLACS cohorts. RESULTS: In total, 157 non-glaucomatous eyes were included. Using multivariable analysis, we found preoperative IOP to be consistently associated with postoperative IOP reduction in the entire cohort. At the 6-month follow-up visit, there was a 12.4% reduction in IOP (-2.2 ± 3.4 mm Hg) seen, with no statistically significant difference between FLACS and CPS (12.3% ± 19.4% vs 12.5% ± 19.3%, respectively, p = 0.32). FLACS reduced the CDE required for phacoemulsification (6.6 ± 4.4%-seconds vs 8.6 ± 6.9%-seconds, respectively, p < 0.05). CDE was a predictor of IOP response at 6 months, but subgroup analysis revealed that this trend was driven by seven eyes requiring high CDE, and for the majority of eyes, CDE did not influence the size of the decrease. The seven eyes experiencing highest CDE were less likely to show IOP reduction at 6 months. CONCLUSION: Both FLACS and CPS resulted in similar and significant IOP reductions through 6 months after surgery. Preoperative IOP was significantly associated with IOP reduction, and CDE generally did not influence the size of the decrease.


Asunto(s)
Extracción de Catarata , Catarata , Terapia por Láser , Facoemulsificación , Humanos , Facoemulsificación/métodos , Presión Intraocular , Estudios Prospectivos , Terapia por Láser/métodos , Agudeza Visual , Extracción de Catarata/métodos , Rayos Láser
3.
Eye Contact Lens ; 48(1): 27-32, 2022 Jan 01.
Artículo en Inglés | MEDLINE | ID: mdl-34608027

RESUMEN

OBJECTIVE: To identify corneal structure differences on quantitative high-frequency ultrasound biomicroscopy (UBM) among subjects with congenital glaucoma compared with controls. METHODS: This prospective case-control study evaluated 180 UBM images from 44 eyes of 30 subjects (18 control and 12 glaucoma, mean age 5.2±8.0 years, range 0.2-25.8 years) enrolled in the Pediatric Anterior Segment Imaging and Innovation Study (PASIIS). ImageJ was used to quantify a comprehensive set of corneal structures according to 21 quantitative parameters. Statistical analysis compared corneal measurements in glaucoma subtypes and age-matched controls with significance testing and mixed effects models. RESULTS: Significant differences between congenital glaucoma cases and controls were identified in 16 of 21 measured parameters including angle-to-angle, central and peripheral corneal thicknesses, scleral integrated pixel density, anterior corneal radius of curvature, and posterior corneal radius of curvature. Eight parameters differed significantly between primary congenital glaucoma and glaucoma following congenital cataract surgery. CONCLUSION: Multiple measurable corneal structural differences exist between congenital glaucoma and control eyes, and between primary and secondary congenital glaucoma, including but not limited to corneal width and thickness. The structural differences can be quantified from UBM image analysis. Further studies are needed to determine whether corneal features associated with glaucoma can be used to diagnose or monitor progression of congenital glaucoma.


Asunto(s)
Glaucoma , Adolescente , Adulto , Estudios de Casos y Controles , Niño , Preescolar , Córnea/diagnóstico por imagen , Glaucoma/diagnóstico , Humanos , Lactante , Microscopía Acústica , Esclerótica , Adulto Joven
4.
Int J Mol Sci ; 23(1)2021 Dec 27.
Artículo en Inglés | MEDLINE | ID: mdl-35008666

RESUMEN

Congenital cataracts (CC) are responsible for approximately one-tenth of childhood blindness cases globally. Here, we report an African American family with a recessively inherited form of CC. The proband demonstrated decreased visual acuity and bilateral cataracts, with nuclear and cortical cataracts in the right and left eye, respectively. Exome sequencing revealed a novel homozygous variant (c.563A > G; p.(Asn188Ser)) in GJA3, which was predicted to be pathogenic by structural analysis. Dominantly inherited variants in GJA3 are known to cause numerous types of cataracts in various populations. Our study represents the second case of recessive GJA3 allele, and the first report in African Americans. These results validate GJA3 as a bona fide gene for recessively inherited CC in humans.


Asunto(s)
Catarata/congénito , Catarata/genética , Conexinas/química , Conexinas/genética , Mutación Missense/genética , Secuencia de Aminoácidos , Secuencia de Bases , Niño , Femenino , Homocigoto , Humanos , Dominios Proteicos
5.
Ophthalmology ; 127(9): 1170-1178, 2020 09.
Artículo en Inglés | MEDLINE | ID: mdl-32317176

RESUMEN

PURPOSE: To develop an artificial intelligence (AI) dashboard for monitoring glaucomatous functional loss. DESIGN: Retrospective, cross-sectional, longitudinal cohort study. PARTICIPANTS: Of 31 591 visual fields (VFs) on 8077 subjects, 13 231 VFs from the most recent visit of each patient were included to develop the AI dashboard. Longitudinal VFs from 287 eyes with glaucoma were used to validate the models. METHOD: We entered VF data from the most recent visit of glaucomatous and nonglaucomatous patients into a "pipeline" that included principal component analysis (PCA), manifold learning, and unsupervised clustering to identify eyes with similar global, hemifield, and local patterns of VF loss. We visualized the results on a map, which we refer to as an "AI-enabled glaucoma dashboard." We used density-based clustering and the VF decomposition method called "archetypal analysis" to annotate the dashboard. Finally, we used 2 separate benchmark datasets-one representing "likely nonprogression" and the other representing "likely progression"-to validate the dashboard and assess its ability to portray functional change over time in glaucoma. MAIN OUTCOME MEASURES: The severity and extent of functional loss and characteristic patterns of VF loss in patients with glaucoma. RESULTS: After building the dashboard, we identified 32 nonoverlapping clusters. Each cluster on the dashboard corresponded to a particular global functional severity, an extent of VF loss into different hemifields, and characteristic local patterns of VF loss. By using 2 independent benchmark datasets and a definition of stability as trajectories not passing through over 2 clusters in a left or downward direction, the specificity for detecting "likely nonprogression" was 94% and the sensitivity for detecting "likely progression" was 77%. CONCLUSIONS: The AI-enabled glaucoma dashboard, developed using a large VF dataset containing a broad spectrum of visual deficit types, has the potential to provide clinicians with a user-friendly tool for determination of the severity of glaucomatous vision deficit, the spatial extent of the damage, and a means for monitoring the disease progression.


Asunto(s)
Inteligencia Artificial , Glaucoma/diagnóstico , Monitoreo Fisiológico , Enfermedades del Nervio Óptico/diagnóstico , Trastornos de la Visión/diagnóstico , Campos Visuales/fisiología , Adulto , Anciano , Estudios Transversales , Reacciones Falso Negativas , Femenino , Glaucoma/fisiopatología , Humanos , Estudios Longitudinales , Masculino , Persona de Mediana Edad , Enfermedades del Nervio Óptico/fisiopatología , Valor Predictivo de las Pruebas , Estudios Retrospectivos , Sensibilidad y Especificidad , Trastornos de la Visión/fisiopatología , Agudeza Visual/fisiología
6.
Ophthalmology ; 126(6): 822-828, 2019 06.
Artículo en Inglés | MEDLINE | ID: mdl-30731101

RESUMEN

PURPOSE: To determine the agreement of 6 established visual field (VF) progression algorithms in a large dataset of VFs from multiple institutions and to determine predictors of discordance among these algorithms. DESIGN: Retrospective longitudinal cohort study. PARTICIPANTS: Visual fields from 5 major eye care institutions in the United States were analyzed, including a subset of eyes with at least 5 Swedish interactive threshold algorithm standard 24-2 VFs that met our reliability criteria. Of a total of 831 240 VFs, a subset of 90 713 VFs from 13 156 eyes of 8499 patients met the inclusion criteria. METHODS: Six commonly used VF progression algorithms (mean deviation [MD] slope, VF index slope, Advanced Glaucoma Intervention Study, Collaborative Initial Glaucoma Treatment Study, pointwise linear regression, and permutation of pointwise linear regression) were applied to this cohort, and each eye was determined to be stable or progressing using each measure. Agreement between individual algorithms was tested using Cohen's κ coefficient. Bivariate and multivariate analyses were used to determine predictors of discordance (3 algorithms progressing and 3 algorithms stable). MAIN OUTCOME MEASURES: Agreement and discordance between algorithms. RESULTS: Individual algorithms showed poor to moderate agreement with each other when compared directly (κ range, 0.12-0.52). Based on at least 4 algorithms, 11.7% of eyes progressed. Major predictors of discordance or lack of agreement among algorithms were more depressed initial MD (P < 0.01) and older age at first available VF (P < 0.01). A greater number of VFs (P < 0.01), more years of follow-up (P < 0.01), and eye care institution (P = 0.03) also were associated with discordance. CONCLUSIONS: This extremely large comparative series demonstrated that existing algorithms have limited agreement and that agreement varies with clinical parameters, including institution. These issues underscore the challenges to the clinical use and application of progression algorithms and of applying big-data results to individual practices.


Asunto(s)
Algoritmos , Trastornos de la Visión/diagnóstico , Campos Visuales/fisiología , Adolescente , Adulto , Anciano , Anciano de 80 o más Años , Conjuntos de Datos como Asunto , Progresión de la Enfermedad , Femenino , Estudios de Seguimiento , Glaucoma de Ángulo Abierto/diagnóstico , Glaucoma de Ángulo Abierto/fisiopatología , Humanos , Presión Intraocular/fisiología , Masculino , Persona de Mediana Edad , Reproducibilidad de los Resultados , Estudios Retrospectivos , Trastornos de la Visión/fisiopatología , Pruebas del Campo Visual/métodos , Adulto Joven
7.
Eye Contact Lens ; 45(1): 11-18, 2019 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-30199425

RESUMEN

OBJECTIVES: Ocular surface disease frequently coexists with glaucoma and may be initiated or exacerbated by topical glaucoma medications. We performed a review of current literature to assess the prevalence, causes, and treatment of ocular surface disease in glaucoma patients, specifically those on topical therapy. METHODS: A Pubmed database search was conducted. A total of 720 articles published from 1972 to 2018 were found in relation with ocular surface disease, glaucoma, and glaucoma medications. Of these, 102 articles were included in this analysis. We included primary and empirical studies for patients on topical glaucoma medications. Exclusion criteria included case reports, non-English studies, and articles unrelated to the primary subject of this review. RESULTS: Ocular surface disease among normal and glaucomatous eyes was evaluated based on diagnostic testing including clinical examination and questionnaires to determine visual function and quality of life. Glaucoma medications can be associated with toxicities to the ocular surface, most often due to the nature of the preservative included in the medication; however, the incidence of toxicity can be mitigated by the use of preservative free medications, decreased preservative medications, or treatment of dry eye disease. Treatment of glaucoma with laser trabeculoplasty or minimally invasive glaucoma surgeries that spare the conjunctiva and the cornea may avoid or decrease reliance on topical glaucoma medications, potentially avoiding the initiation or progression of ocular surface disease. CONCLUSIONS: Recognition and treatment of ocular surface disease in glaucoma patients may improve patient quality of life and medication adherence. This may ultimately improve glaucoma treatment outcomes.


Asunto(s)
Antihipertensivos/efectos adversos , Síndromes de Ojo Seco/inducido químicamente , Glaucoma/tratamiento farmacológico , Antihipertensivos/administración & dosificación , Conjuntiva/patología , Córnea/patología , Síndromes de Ojo Seco/diagnóstico , Humanos , Soluciones Oftálmicas
8.
Int Ophthalmol ; 39(4): 829-837, 2019 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-29516316

RESUMEN

PURPOSE: In this novel study, we demonstrate a standardized imaging and measurement protocol of anterior segment (AS) structures with reliability analysis using ultrasound biomicroscopy (UBM) and ImageJ software. METHODS: Ten pediatric and young adult patients undergoing examination under anesthesia for AS pathology were imaged using UBM. Four trained observers analyzed 20 images using ImageJ. Forty-five structural parameters were measured. Those that relied on the trabecular-iris angle (TIA) as a reference landmark were labeled TIA-dependent (TD) and all others were labeled non-TIA dependent (NTD). Intra-observer repeatability (IOR) and inter-observer agreement (IOA) of measurements were determined using coefficient of variation (CV) and intra-class correlation (ICC) followed by assessment of Bland-Altman plots (BAP) for each pair of observers, respectively. RESULTS: For NTD parameters, non-ciliary body (CB) related measurements showed CV range 0.60-16.22% and ICC range 0.84-0.89, whereas CB-related parameters showed CV range 2.86-23.40% and ICC range 0.29-0.92. For TD parameters, parameters < 2 degrees removed from reference showed CV range 0.02-5.40% and ICC range 0.89-1.00, whereas parameters > 1 degree removed showed CV range 0.63-27.44% and ICC range 0.22-1.00. No systematic proportional bias was detected by BAPs. CONCLUSIONS: Preplaced landmarks yielded good IOR and IOA in quantitative assessment of AS structures that were NTD and non-CB-related or less removed from the reference. CB-related NTD measurements varied greatly in IOR and IOA, indicating protocol modifications or CB qualitative assessments needed to improve accuracy. Variability in TD measurements increased the further removed from the reference, which supports implementation of a reliable reference landmark to minimize variation.


Asunto(s)
Cámara Anterior/diagnóstico por imagen , Catarata/diagnóstico por imagen , Glaucoma/diagnóstico por imagen , Microscopía Acústica , Adolescente , Adulto , Puntos Anatómicos de Referencia , Catarata/congénito , Niño , Preescolar , Femenino , Glaucoma/congénito , Humanos , Interpretación de Imagen Asistida por Computador , Lactante , Recién Nacido , Masculino , Variaciones Dependientes del Observador , Reproducibilidad de los Resultados , Adulto Joven
9.
Int Ophthalmol ; 39(8): 1761-1766, 2019 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-30054849

RESUMEN

PURPOSE: To compare the amount of phacoemulsification ultrasound energy used between eyes undergoing femtosecond laser-assisted cataract surgery (FLACS) and conventional phacoemulsification. METHODS: One eye of consecutive patients undergoing routine non-complicated phacoemulsification from January 2014 to December of 2015 was included in the analysis. FLACS was performed using the Alcon LenSx. Linear regression was used for analysis with type of surgery (FLACS versus conventional phacoemulsification) as the exposure and cumulative dispersed energy (CDE) as the outcome variable. Age, surgeon, eye side, and eye sequence (first versus second eye) were covariates. RESULTS: A total of 1159 surgeries met inclusion criteria. The average age of the cohort was 70.6 (SD 8.6) years, 590 cases (51%) were performed by surgeon 1, and 582 cases (50%) were right eyes. Overall, FLACS resulted in significantly lower CDE as compared to conventional phacoemulsification (ß = 0.89, 95% CI 0.83, 0.95). When stratified by eye side and surgeon, FLACS performed on left eyes operated on by surgeon 1 resulted in lower CDE as compared to conventional phacoemulsification (ß = 0.76, 95% CI 0.66, 0.87), but not for right eyes operated on by surgeon 1 (ß = 0.92, 95% CI 0.79, 1.07) or for eyes operated on by surgeons 2 or 3. CONCLUSIONS: The use of FLACS on the Alcon LenSx platform results in a small decrease in phacoemulsification energy as compared to conventional phacoemulsification in certain cases. Further study assessing optimal laser settings and surgical technique is necessary.


Asunto(s)
Terapia por Láser/métodos , Facoemulsificación/métodos , Agudeza Visual , Anciano , Femenino , Estudios de Seguimiento , Humanos , Masculino , Estudios Prospectivos , Resultado del Tratamiento , Ondas Ultrasónicas
11.
Int Ophthalmol ; 37(1): 63-70, 2017 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-27061903

RESUMEN

The purpose of the study was to determine the independent predictors of long-term intraocular pressure (IOP) reduction after cataract surgery with phacoemulsification. This is a retrospective review of uncomplicated cataract surgeries from 2006 to 2008 at the Baltimore VA Medical Center with longitudinal follow-up. Demographic, clinical, biometric, and intraoperative variables including phacoemulsification parameters were recorded. Univariate and multivariate linear regression were used to analyze the relationship between these variables and postoperative IOP, which was the outcome variable. Analysis was performed in 115 eyes of 115 patients who underwent uncomplicated phacoemulsification during the study period. There was an average postoperative IOP reduction through 12, 24, and 36 months of -1.7 ± 3.1, -1.5 ± 3.8, and -1.3 ± 2.6 mmHg, respectively. Higher preoperative IOP (P < 0.001), a more anterior relative lens position (P < 0.05), and longer phaco time (P < 0.05) were significantly associated with greater postoperative decrease in IOP using univariate analysis. Using multivariate analysis, preoperative IOP (P < 0.001), and phaco time (P = 0.038) were associated with greater postoperative IOP reduction through 24 months. Phaco time is independently associated with IOP reduction after adjusting for age and preoperative IOP. Higher preoperative IOP is associated with a greater IOP-lowering effect after phacoemulsification.


Asunto(s)
Catarata/complicaciones , Presión Intraocular/fisiología , Facoemulsificación , Anciano , Anciano de 80 o más Años , Cámara Anterior/patología , Longitud Axial del Ojo , Catarata/fisiopatología , Femenino , Humanos , Cristalino/patología , Masculino , Persona de Mediana Edad , Tempo Operativo , Análisis de Regresión , Estudios Retrospectivos , Factores de Riesgo
13.
Eye Contact Lens ; 42(4): 256-61, 2016 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-26372477

RESUMEN

OBJECTIVES: To determine the frequency, clinical characteristics, and visual outcomes of patients who present with high or normal intraocular pressure (IOP) and open globe injuries. DESIGN: Retrospective chart review. SETTING: University of Maryland Medical Center, a level 1 trauma center. PATIENT OR STUDY POPULATION: All cases of open globe injury presenting to The University of Maryland Medical Center from July 2005 to January 2014. OBSERVATION: Demographics, initial physical examination, computed tomography findings, IOP of the affected and unaffected eyes, and follow-up evaluations. MAIN OUTCOME MEASURES: (1) IOP 10 mm Hg or greater and (2) visual acuity. RESULTS: Of 132 eyes presenting with open globe injury, IOP was recorded in 38 (28%). Mean IOP for the affected and unaffected eyes was 14±10.3 mm Hg and 16.6±4.1 mm Hg, respectively. Twenty-three (59.4%) eyes had IOP greater than 10 mm Hg. Six eyes (16.2%) had IOP greater than 21 mm Hg. Using bivariate analysis, IOP greater than 10 mm Hg was associated with posterior open globe injury (P=0.01), posterior hemorrhage (P=0.04), and intraconal retrobulbar hemorrhage (P=0.05). Adjusting for age, sex, and race, IOP greater than 10 mm Hg was associated with the presence of posterior open globe injury on clinical examination (P=0.04). Higher presenting IOP was found to predict light perception or worse vision (P=0.01). Multivariate analysis showed that poor presenting vision was the best predictor of poor final vision (P<0.01). CONCLUSIONS: High IOP does not exclude open globe injury. It is a frequent finding in patients with open globe injuries and may be associated with posterior injury and poor visual prognosis.


Asunto(s)
Perforación Corneal/diagnóstico , Lesiones Oculares Penetrantes/diagnóstico , Presión Intraocular/fisiología , Segmento Posterior del Ojo/lesiones , Adulto , Anciano , Femenino , Hemorragia/complicaciones , Hemorragia/fisiopatología , Humanos , Masculino , Persona de Mediana Edad , Fracturas Orbitales , Pronóstico , Estudios Retrospectivos , Tomografía Computarizada por Rayos X , Centros Traumatológicos , Resultado del Tratamiento , Agudeza Visual/fisiología
14.
Cardiol Young ; 26(6): 1158-67, 2016 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-26561359

RESUMEN

We assessed parental attitudes towards congenital cardiovascular malformations in their children in a cross-sectional study in Egypt. Parents face many problems related to concerns about their child's prognosis, but these associations with parental stress have never been evaluated in Egypt or examined in relation to religiosity in a predominantly Muslim society. Accordingly, we conducted interviews in Cairo with mothers of 99 sequential infants born with conotruncal heart malformations (cases) and 65 mothers of age-matched controls. The survey assessed healthcare access and usage, knowledge of congenital cardiovascular malformations, religiosity, the Locus of Control Scale, and the Parenting Stress Index. Results showed that 45% of the mothers of cases had correct knowledge about their child's diagnosis; 85% were satisfied with the clinical care; and 79% reported that the cost of care was burdensome. Compared with parents of cases, parents of controls were more likely to report stress overall and all its subscales. Regarding belief about locus of control over health, God as a determining factor was given the highest endorsement. Mothers in the congenital cardiovascular malformations group reported a higher level of parental locus of control than did those in the control group. The correlations between stress and locus of control were stronger in the control than in the case group. Religiosity was related neither to stress nor to locus of control. Future studies can explore the roles that personal, familial, and societal factors play in exacerbating or reducing stress levels among parents of sick children, particularly in developing countries where economic pressures are acute.


Asunto(s)
Conocimientos, Actitudes y Práctica en Salud , Cardiopatías Congénitas/diagnóstico , Madres/psicología , Responsabilidad Parental/psicología , Estrés Psicológico/epidemiología , Adulto , Estudios de Casos y Controles , Estudios Transversales , Egipto , Femenino , Humanos , Lactante , Recién Nacido , Masculino , Escalas de Valoración Psiquiátrica , Religión , Encuestas y Cuestionarios , Adulto Joven
16.
Biomed Opt Express ; 15(5): 3457-3479, 2024 May 01.
Artículo en Inglés | MEDLINE | ID: mdl-38855695

RESUMEN

The measurement of retinal blood flow (RBF) in capillaries can provide a powerful biomarker for the early diagnosis and treatment of ocular diseases. However, no single modality can determine capillary flowrates with high precision. Combining erythrocyte-mediated angiography (EMA) with optical coherence tomography angiography (OCTA) has the potential to achieve this goal, as EMA can measure the absolute RBF of retinal microvasculature and OCTA can provide the structural images of capillaries. However, multimodal retinal image registration between these two modalities remains largely unexplored. To fill this gap, we establish MEMO, the first public multimodal EMA and OCTA retinal image dataset. A unique challenge in multimodal retinal image registration between these modalities is the relatively large difference in vessel density (VD). To address this challenge, we propose a segmentation-based deep-learning framework (VDD-Reg), which provides robust results despite differences in vessel density. VDD-Reg consists of a vessel segmentation module and a registration module. To train the vessel segmentation module, we further designed a two-stage semi-supervised learning framework (LVD-Seg) combining supervised and unsupervised losses. We demonstrate that VDD-Reg outperforms existing methods quantitatively and qualitatively for cases of both small VD differences (using the CF-FA dataset) and large VD differences (using our MEMO dataset). Moreover, VDD-Reg requires as few as three annotated vessel segmentation masks to maintain its accuracy, demonstrating its feasibility.

17.
Sci Rep ; 14(1): 12790, 2024 06 04.
Artículo en Inglés | MEDLINE | ID: mdl-38834830

RESUMEN

This prospective study evaluated the relationship between laser speckle contrast imaging (LSCI) ocular blood flow velocity (BFV) and five birth parameters: gestational age (GA), postmenstrual age (PMA) and chronological age (CA) at the time of measurement, birth weight (BW), and current weight (CW) in preterm neonates at risk for retinopathy of prematurity (ROP). 38 Neonates with BW < 2 kg, GA < 32 weeks, and PMA between 27 and 47 weeks underwent 91 LSCI sessions. Correlation tests and regression analysis were performed to quantify relationships between birth parameters and ocular BFV. Mean ocular BFV index in this cohort was 8.8 +/- 4.0 IU. BFV positively correlated with PMA (r = 0.3, p = 0.01), CA (r = 0.3, p = 0.005), and CW (r = 0.3, p = 0.02). BFV did not correlate with GA nor BW (r = - 0.2 and r = - 0.05, p > 0.05). Regression analysis with mixed models demonstrated that BFV increased by 1.2 for every kilogram of CW, by 0.34 for every week of CA, and by 0.36 for every week of PMA (p = 0.03, 0.004, 0.007, respectively). Our findings indicate that increased age and weight are associated with increased ocular BFV measured using LSCI in premature infants. Future studies investigating the associations between ocular BFV and ROP clinical severity must control for age and/or weight of the infant.


Asunto(s)
Peso al Nacer , Edad Gestacional , Retinopatía de la Prematuridad , Humanos , Recién Nacido , Femenino , Masculino , Estudios Prospectivos , Recien Nacido Prematuro , Velocidad del Flujo Sanguíneo , Vasos Retinianos/diagnóstico por imagen , Vasos Retinianos/fisiopatología , Retina/fisiopatología , Retina/diagnóstico por imagen , Factores de Riesgo , Flujo Sanguíneo Regional
18.
Res Sq ; 2024 Feb 22.
Artículo en Inglés | MEDLINE | ID: mdl-38464120

RESUMEN

This prospective study evaluated the relationship between laser speckle contrast imaging (LSCI) ocular blood flow velocity (BFV) and five birth parameters: gestational age (GA), postmenstrual age (PMA), and chronological age (CA) at the time of measurement, birth weight (BW), and current weight (CW) in preterm neonates at risk for retinopathy of prematurity (ROP).38 Neonates with BW < 2 kg, GA < 32 weeks, and PMA between 27-47 weeks underwent 91 LSCI sessions. Correlation tests and regression analysis were performed to quantify relationships between birth parameters and ocular BFV. Mean ocular BFV index in this cohort was 8.8 +/- 4.0 IU. BFV positively correlated with PMA (r = 0.3, p = 0.01), CA (r = 0.3, p = 0.005), and CW (r = 0.3, p = 0.02). BFV did not correlate with GA nor BW (r=-0.2 and r=-0.05, p > 0.05). Regression analysis with mixed models demonstrated that BFV increased by 1.2 for every kilogram of CW, by 0.34 for every week of CA, and by 0.36 for every week of PMA (p = 0.03, 0.004, 0.007, respectively). Our findings indicate that increased age and weight are associated with increased ocular BFV measured using LSCI in premature infants. Future studies investigating the associations between ocular BFV and ROP clinical severity must control for age and/or weight of the infant.

19.
Ophthalmol Sci ; 4(4): 100463, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38591050

RESUMEN

Purpose: To determine the correlation between blood flow metrics measured by intravenous fluorescein angiography (IVFA) and the blood flow velocity index (BFVi) obtained by laser speckle contrast imaging (LSCI) in infants with retinopathy of prematurity (ROP). Design: Prospective comparative pilot study. Subjects: Seven eyes from 7 subjects with ROP. Methods: Unilateral LSCI and IVFA data were obtained from each subject in the neonatal intensive care unit. Five LSCI-based metrics and 5 IVFA-based metrics were extracted from images to quantify blood flow patterns in the same region of interest. Correlation between LSCI-based and IVFA-based blood flow metrics was compared between 2 subgroups of ROP severity: moderate ROP (defined as stage ≤ 2 without Plus disease) and severe ROP (defined as stage ≥3 or Plus disease). Main Outcome Measures: Pearson and Kendall rank correlation coefficients between IVFA and LSCI metrics; Student t test P values comparing LSCI metrics between "severe" and "moderate" ROP groups. Results: Pearson correlations between IVFA and LSCI included arterial-venous transit time (AVTT) and peak BFVi (pBFVi; r = -0.917; P = 0.004), AVTT and dip BFVi (dBFVi; r = -0.920; P = 0.003), AVTT and mean BFVi (r = -0.927- P = 0.003), and AVTT and volumetric rise index (r = -0.779; P = 0.039). Kendall rank correlation between AVTT and dBFVi was r = -0.619 (P = 0.051). pBFVi was higher in severe ROP than in moderate ROP (8.4 ± 0.6 and 4.4 ± 1.8, respectively; P = 0.0045 using the 2-sample t test with pooled variance and P = 0.0952 using the Wilcoxon rank-sum test). Conclusions: Correlation was found between blood flow metrics obtained by IVFA and noninvasive LSCI techniques. We demonstrate the feasibility of obtaining quantitative metrics using LSCI in infants with ROP in this pilot study; however, further investigation is needed to evaluate its potential use in clinical assessment of ROP severity. Financial Disclosures: Proprietary or commercial disclosure may be found in the Footnotes and Disclosures at the end of this article.

20.
Eye Contact Lens ; 39(6): 410-2, 2013 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-24045832

RESUMEN

PURPOSE: To describe a patient with Exophiala jeanselmei keratitis and to review the prior cases reported in the literature. METHODS: We report one patient with keratitis after remote injury and chronic steroid use and review the six prior reported cases. RESULTS: Culture plates from corneal scraping revealed growth of the dematiaceous fungi, E. jeanselmei, a rare causative organism of ocular infection. The patient underwent therapy with topical and intracameral antifungals and subsequently required a corneal transplant. Biopsy of the donor graft confirmed the diagnosis of E. jeanselmei. This is the first reported case to use intracameral antifungal agents and the first biopsy proven case. Half of reported cases experienced associated trauma, and severity was generally related to delay in diagnosis. CONCLUSIONS: Trauma and chronic topical steroid use contributed to the development of severe keratitis in this patient. Patients on chronic steroids should be monitored closely. Topical, subconjunctival, and intracameral antifungals have all been effective in treating this pathogen. If diagnosed and treated early, E. jeanselmei keratitis can have a good visual outcome.


Asunto(s)
Exophiala/aislamiento & purificación , Infecciones Fúngicas del Ojo/microbiología , Queratitis/microbiología , Adulto , Lesiones de la Cornea , Cuerpos Extraños en el Ojo/complicaciones , Humanos , Masculino
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