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      Capacidad diagnóstica del HRT-II y de las perimetrías TOP, PULSAR y FDT en pacientes sospechosos de sufrir glaucoma Translated title: Diagnostic capability of PULSAR, FDT y HRT-II in glaucoma suspects

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          Abstract

          Objetivos: Determinar la capacidad diagnóstica de TOP-32, PULSAR-T30W, FDT-Umbral-N30 y HRT-II en glaucoma de sospecha. Métodos: 47 ojos de 47 sujetos remitidos por sospecha de glaucoma (SG) se examinaron dos veces. Se excluyeron los casos con defecto medio (MD) superior a 6dB en TOP-32. Los resultados se compararon con los obtenidos en 70 sujetos normales control (C). Resultados: No se observaron diferencias significativas entre los valores de MD obtenidos en TOP-32, en los grupos SG (0,96dB. DE=1,7) y C (0,8dB. DE=1,77) (p0.05). El área papilar de SG (2,12 mm². DE=0.34) fue significativamente superior que en C (1,97 mm². DE=0,45) (p<0,01). Para una especificidad del 95%, la raíz cuadrada de la varianza de pérdida (sLV) de PULSAR presentó la mayor sensibilidad (30,9%) en exámenes individuales. La mayor reproducibilidad diagnóstica se obtuvo con la máxima elevación del contorno de HRT-II (23%) y con el Plano de referencia (23,4%), siendo del 14,9% para varios índices, después de corregir la influencia del tamaño papilar (área de la excavación, cocientes de área excavación/papila, máxima depresión del contorno y espesor de la capa de fibras). La reproducibilidad de los índices perimétricos fue: PULSAR-MD=8,5%, PULSARsLV= 17%, FDT-MD=6,4%, FDT-PDT=4,3%. La asociación entre índices perimétricos y HRT-II elevó la sensibilidad pero redujo la reproducibilidad diagnóstica. Conclusiones: Los índices de mayor eficacia fueron la máxima elevación del contorno, el plano de referencia y PULSAR-sLV, aunque la inclusión del aspecto papilar en la selección del grupo SG favoreció los resultados de HRT-II.

          Translated abstract

          Purpose: To determine the diagnostic capability of PULSAR-T30W, FDT-Threshold-N30 and HRT-II in glaucoma suspects. Methods: Forty-seven eyes from 47 referred glaucoma suspects (GS) were examined twice with each technique. Cases with TOP-WW-MD6dB were excluded. Results were compared with those of 70 eyes from 70 normal controls (C). Results: Mean MD value using TOP-WW in the GS group (0.96dB. sd=1.7) was not significantly different from C (0.8dB. sd=1.77) (p0.05). Disc area in GS group (2.12 mm². sd=0.34) was significantly greater than in C (1.97 mm². sd=0.45) (p<0.01). For 95.7% specificity, PULSAR-sLV showed the highest sensitivity of 30.9% in individual examinations. The highest reproducible sensitivity in the two examinations was obtained using HRT-II maximum contour elevation (23.4%) and reference height (23.4%), and was 14.9% for various indices after correcting for the influence of disc area (cup area, cup/disc area ratio, maximum contour depression and mean RNFL thickness). Reproducible sensitivity of the perimetric indices was: PULSARMD=8.5%, PULSAR-sLV=17%, FDT-MD=6.4%, FDT-PSD=4.3%. The association of perimetric and HRT-II indices achieved high sensitivity but low diagnostic reproducibility. Conclusions: The most effective indices were maximum contour elevation, reference height and PULSAR-sLV, although the inclusion of the optic nerve head assessment in the selection of the GS sample may have favored the HRT-II results.

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          The Ocular Hypertension Treatment Study: baseline factors that predict the onset of primary open-angle glaucoma.

          The Ocular Hypertension Treatment Study (OHTS) has shown that topical ocular hypotensive medication is effective in delaying or preventing the onset of primary open-angle glaucoma (POAG) in individuals with elevated intraocular pressure (ocular hypertension) and no evidence of glaucomatous damage. To describe baseline demographic and clinical factors that predict which participants in the OHTS developed POAG. Baseline demographic and clinical data were collected prior to randomization except for corneal thickness measurements, which were performed during follow-up. Proportional hazards models were used to identify factors that predicted which participants in the OHTS developed POAG. In univariate analyses, baseline factors that predicted the development of POAG included older age, race (African American), sex (male), larger vertical cup-disc ratio, larger horizontal cup-disc ratio, higher intraocular pressure, greater Humphrey visual field pattern standard deviation, heart disease, and thinner central corneal measurement. In multivariate analyses, baseline factors that predicted the development of POAG included older age, larger vertical or horizontal cup-disc ratio, higher intraocular pressure, greater pattern standard deviation, and thinner central corneal measurement. Baseline age, vertical and horizontal cup-disc ratio, pattern standard deviation, and intraocular pressure were good predictors for the onset of POAG in the OHTS. Central corneal thickness was found to be a powerful predictor for the development of POAG.
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            Identification of early glaucoma cases with the scanning laser ophthalmoscope.

            This study aimed to define the confocal laser scanning ophthalmoscope (Heidelberg Retina Tomograph [HRT]) parameters that best separate patients with early glaucoma from normal subjects. A cross-sectional study. A total of 80 normal subjects and 51 patients with early glaucoma participated (average visual field mean deviation = -3.6 dB). Imaging of the optic nerve head with the HRT and analysis using software version 1.11 were performed. The relation between neuroretinal rim area and optic disc area, and cup-disc area ratio and optic disc area, was defined by linear regression of data derived from the normal subjects. The normal ranges for these two parameters were defined by the 99% prediction intervals of the linear regression between the parameter and optic disc area, for the whole disc, and for each of the predefined segments. Normal subjects and patients were labeled as abnormal if the parameter for either the whole disc or any of the predefined segments was outside the normal range. The sensitivity and specificity values of the method were calculated. The highest specificity (96.3%) and sensitivity (84.3%) values to separate normal subjects and those patients with early glaucoma were obtained using the 99% prediction interval from the linear regression between the optic disc area and the log of the neuroretinal rim area. Similar specificity (97.5%) and lower sensitivity (74.5%) values were obtained with the 99% prediction interval derived from regression between the disc area and cup-disc area ratios. Poor separation between groups was obtained with the other parameters. The HRT, using the technique of linear regression to account for the relationship between optic disc size and rim area or cup-disc area ratio, provides good separation between control subjects and patients with early glaucoma in this population.
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              Discriminating between normal and glaucomatous eyes using the Heidelberg Retina Tomograph, GDx Nerve Fiber Analyzer, and Optical Coherence Tomograph.

              To compare the ability of 3 instruments, the Heidelberg Retina Tomograph (HRT), the GDx Nerve Fiber Analyzer (GDx), and the Optical Coherence Tomograph (OCT), to discriminate between healthy eyes and eyes with early to moderate glaucomatous visual field loss. Forty-one patients with early to moderate glaucomatous visual field loss and 50 healthy subjects were included in the study. The HRT, GDx, and OCT imaging and visual field testing were completed on 1 eye from each subject within a 6-month interval. Statistical differences in sensitivity at fixed specificities of 85%, 90%, and 95% were evaluated. In addition, areas under the receiver operating characteristic (ROC) curve were compared. No significant differences were found between the area under the ROC curve and the best parameter from each instrument: OCT thickness at the 5-o'clock inferior temporal position (mean +/- SE, 0.87 +/- 0.04), HRT mean height contour in the nasal inferior region (mean +/- SE, 0.86 +/- 0.04), and GDx linear discriminant function (mean +/- SE, 0.84 +/- 0.04). Twelve HRT, 2 GDx, and 9 OCT parameters had an area under the ROC curve of at least 0.81. At a fixed specificity of 90%, significant differences were found between the sensitivity of OCT thickness at the 5-o'clock inferior temporal position (71%) and parameters with sensitivities less than 52%. Qualitative assessment of stereophotographs resulted in a sensitivity of 80%. Although the area under the ROC curves was similar among the best parameters from each instrument, qualitative assessment of stereophotographs and measurements from the OCT and HRT generally had higher sensitivities than measurements from the GDx.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                aseo
                Archivos de la Sociedad Española de Oftalmología
                Arch Soc Esp Oftalmol
                Sociedad Española de Oftalmología (, , Spain )
                0365-6691
                July 2007
                : 82
                : 7
                : 413-422
                Affiliations
                [01] Islas Canarias orgnameHospital Universitario de Canarias orgdiv1Servicio de Oftalmología España
                Article
                S0365-66912007000700005
                10.4321/s0365-66912007000700005
                08d38444-b46e-4acc-b856-dfaa12978930

                This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 International License.

                History
                : 12 June 2007
                : 31 May 2006
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 34, Pages: 10
                Product

                SciELO Spain


                Glaucoma,perimetría,campo visual,diagnóstico,nervio óptico,perimetry,visual field,diagnosis,optic nerve

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