Post-acute non-arteritic ischemic optic neuropathy (NAION) and glaucomatous optic neuropathy (GON) can be difficult to differentiate clinically. Our objective was to identify optical coherence ...tomography (OCT) parameters to help differentiate these optic neuropathies.
We compared 12 eyes of 8 patients with NAION and 12 eyes of 12 patients with GON, matched for age and visual field mean deviation (MD). All patients underwent clinical assessment, automated perimetry (Humphrey Field Analyzer II; Carl Zeiss Meditec, Dublin, CA, USA), and OCT imaging (Spectralis OCT2; Heidelberg Engineering, Heidelberg, Germany) of the optic nerve head and macula. We derived the neuroretinal minimum rim width (MRW), peripapillary retinal nerve fibre layer (RNFL) thickness, central anterior lamina cribrosa depth, and macular retinal thickness.
MRW was markedly thicker, both globally and in all sectors, in the NAION group compared to the GON group. There was no significant group difference in RFNL thickness, globally or in any sector, with the exception of the temporal sector that was thinner in the NAION group. The group difference in MRW increased with increasing visual field loss. Other differences observed included lamina cribrosa depth significantly greater in the GON group and significantly thinner central macular retinal layers in the NAION group. The ganglion cell layer was not significantly different between the groups.
The neuroretinal rim is altered in a dissimilar manner in NAION and GON and MRW is a clinically useful index for differentiating these two neuropathies. The fact that the difference in MRW between the two groups increased with disease severity suggests distinct remodelling patterns in response to differing insults with NAION and GON.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
To determine the rate of glaucomatous visual field change in routine clinical care.
Mean deviation (MD) rate was computed in one randomly selected eye of all glaucoma patients and suspects with ≥5 ...examinations in a tertiary eye-care center. Proportions of "fast" (MD rate, <-1 to -2 dB/y) and "catastrophic" (<-2 dB/y) progressors were determined. The MD rates were computed in tertile groups by the number of examinations, baseline age, and MD. The MD rates were compared to the Canadian Glaucoma Study (CGS), a prospective study with IOP interventions mandated by visual field progression, by pairwise matching of patients by baseline MD.
There were 2324 patients with median (interquartile range) baseline age and MD of 65 (56, 74) years and -2.44 (-5.44, -0.86) dB, and follow-up of 7.1 (4.8, 10.2) years with 8 (6, 11) examinations. The median MD rate was -0.05 (0.13, -0.30) dB/y, while the mean follow-up IOP was 17.1 (15.0, 19.7) mm Hg. The MD rate was progressively worse, with a doubling of fast and catastrophic progressors, with each tertile of increasing age. Worse MD rate was associated with lower follow-up IOP. Neither MD rate nor the number of fast and catastrophic progressors was significantly different in clinical care patients matched to CGS patients.
Most patients under routine glaucoma care demonstrate slow rates of visual field progression. The MD rate in the current study was similar to an interventional prospective study, but considerably less negative compared to published studies with similar design.
To describe the outcomes of patients who underwent a single ab interno trabeculectomy revision augmented with 5-fluorouracil.
Retrospective cohort study.
All patients who had undergone ab interno ...trabeculectomy revision at a single tertiary care centre during the 5-year study period. All patients had advanced glaucomatous optic neuropathy, and all treated ages and glaucoma subtypes were included.
Outcome measures included surgical success, number of topical intraocular pressure (IOP)–lowering drops, best-corrected visual acuity, visual field mean deviation, and postoperative complications. Success at 12 months was defined using 2 criteria: criterion A (IOP <15 mm Hg and >20% reduction) and criterion B (IOP <12 mm Hg and >20% reduction). Each success criterion was subdivided into patients who achieved success without topical IOP-lowering drops (complete success) or with topical therapy (qualified success).
This study included 46 eyes of 46 patients. Of these, 34 patients were followed for 12 months or more to assess surgical success. Success defined by criterion A was achieved by 68% of these 34 patients (53% complete, 15% qualified). Success defined by criterion B was achieved by 47% of these patients (38% complete, 9% qualified). Early hypotony was noted in 68% of eyes but was not associated with negative visual acuity or visual field outcomes.
An IOP of <12 mm Hg and a >20% IOP reduction were achieved by 47% of patients overall (with or without topical therapy) at 12 months of follow-up. Transient early postoperative hypotony should be expected following ab interno revision trabeculectomy.
Décrire les résultats obtenus chez les patients qui ont subi une révision de trabéculectomie ab interno dans un seul œil, accompagnée de 5-fluorouracil.
Étude de cohorte rétrospective.
Ensemble des patients qui avaient subi une révision de trabéculectomie ab interno dans un seul établissement de soins tertiaires pendant les 5 années de l’étude. Tous les patients inclus présentaient une neuropathie optique glaucomateuse avancée, sans égard à l’âge et au sous-type de glaucome.
Au nombre des paramètres d’évaluation, mentionnons la réussite de l'intervention chirurgicale, le nombre de collyres visant à abaisser la pression intraoculaire (PIO), la meilleure acuité visuelle corrigée, la déviation moyenne du champ visuel ainsi que les complications postopératoires. La réussite à 12 mois reposait sur 2 critères : critère A (PIO < 15 mm Hg et baisse de > 20 % de la PIO) et critère B (PIO < 12 mm Hg et baisse de > 20 % de la PIO). Pour chacun des critères de réussite, on a réparti les patients en 2 groupes selon que la baisse de la PIO a été obtenue sans collyre (réussite complète) ou avec l'ajout de collyres (réussite partielle).
La présente étude regroupe 46 yeux de 46 patients. De ce nombre, 34 patients ont été suivis pendant au moins 12 mois après l'intervention aux fins d’évaluation de la réussite. Parmi ces 34 patients, le taux de réussite selon le critère A a été de 68 % (réussite complète : 53 %; réussite partielle : 15 %) et le taux de réussite selon le critère B, de 47 % (réussite complète : 38 %; réussite partielle : 9 %). Une hypotonie précoce a été observée dans 68 % des yeux, sans qu'elle soit associée à des résultats négatifs au chapitre de l'acuité visuelle ou des champs visuels.
Dans l'ensemble, 47 % des patients présentaient une PIO < 12 mm Hg et une baisse de > 20 % de la PIO (avec ou sans recours aux collyres) lors du suivi à 12 mois. On peut s'attendre à l'apparition d'une hypotonie précoce postopératoire transitoire après une révision de trabéculectomie ab interno.
To describe the 3-year outcomes of patients who underwent ab interno trabeculectomy revision with a translimbal sclerostomy spatula augmented with 5-flourouracil.
Retrospective cohort study.
In this ...single-centre study, inclusion criteria included patients who were 18 years of age or older with advanced glaucoma who had undergone ab interno trabeculectomy revision with 5-flourouracil due to subconjunctival fibrosis and above-target intraocular pressure (IOP). Patients were required to have a minimum follow-up of 3 years.
The primary outcome measure was IOP. Secondary outcome measures included number of topical IOP-lowering medications, best-corrected distance visual acuity, visual field mean deviation, and postoperative complications.
Forty-one eyes of 41 patients met the criteria for inclusion. Survival analysis demonstrated success defined by criterion A (IOP <15 mm Hg and >20% reduction) in 44% of eyes without medication (complete success) and 71% of eyes with or without medication (qualified success) at 3-year follow-up. Complete and qualified successes defined by criterion B (IOP <12 mm Hg and >20% reduction) were achieved by 31% and 44% of eyes, respectively. Early complications included transient hypotony in 26 eyes (63%) and transient hyphema in 3 eyes (7.3%). No persistent complications were reported within the 3-year study period.
Ab interno trabeculectomy revision can be an effective technique for achieving a low target IOP in patients with advanced glaucoma in up to 3-year follow-up.
Abstract
Correlation between structural data from optical coherence tomography and functional data from the visual field may be suboptimal because of poor mapping of OCT measurement locations to VF ...stimuli. We tested the hypothesis that stronger structure–function correlations in the macula can be achieved with fundus-tracking perimetery, by precisely mapping OCT measurements to VF sensitivity at the same location. The conventional 64 superpixel (3° × 3°) OCT grid was mapped to VF sensitivities averaged in 40 corresponding VF units with standard automated perimetry (conventional mapped approach, CMA) in 38 glaucoma patients and 10 healthy subjects. Similarly, a 144 superpixel (2° × 2°) OCT grid was mapped to each of the 68 locations with fundus-tracking perimetry (localized mapped approach, LMA). For each approach, the correlation between sensitivity at each VF unit and OCT superpixel was computed. Vector maps showing the maximum correlation between each VF unit and OCT pixel was generated. CMA yielded significantly higher structure–function correlations compared to LMA. Only 20% of the vectors with CMA and < 5% with LMA were within corresponding mapped OCT superpixels, while most were directed towards loci with structural damage. Measurement variability and patterns of structural damage more likely impact correlations compared to precise mapping of VF stimuli.
Estimating the rate of glaucomatous visual field change provides practical assessment of disease progression and has implications for management decisions.
To assess the rates of visual field change ...in patients receiving treatment for glaucoma compared with healthy individuals over an extensive follow-up period and to quantify the impact of important covariates for these rates.
This prospective longitudinal cohort study was conducted in a hospital-based setting from January 1991 to February 2020. The study included 40 patients receiving treatment for open-angle glaucoma and 29 healthy participants. One eye of each participant was randomly selected as the study eye.
Patients with glaucoma and healthy participants received testing with standard automated perimetry every 6 months. Individual rates of mean sensitivity change were computed using ordinary least-squares regression analysis, and linear mixed-effects modeling was used to estimate the mean rates of mean sensitivity change in the 2 groups and the impact of baseline mean sensitivity, baseline age, and follow-up intraocular pressure for rate estimates.
Rate of mean sensitivity change in patients with glaucoma and healthy participants.
A total of 40 patients with glaucoma (median age, 53.07 years IQR, 48.34-57.97 years; 21 men 52%) and 29 healthy participants (median age, 48.80 years IQR, 40.40-59.07 years, 17 women 59%) were followed up for a median of 25.65 years (IQR, 22.49-27.02 years) and 19.56 years (IQR, 16.19-26.21 years), respectively. Most participants (65 individuals 94%) self-identified as White, with the exception of 2 patients with glaucoma (1 self-identified as Black and 1 as South Asian) and 2 healthy participants (both self-identified as South Asian). The mean follow-up intraocular pressure of patients with glaucoma (median, 15.83 mm Hg IQR, 13.05-17.33 mm Hg) was similar to that of healthy participants (median, 14.94 mm Hg IQR, 13.28-16.01 mm Hg; P = .25). In an ordinary least-squares regression analysis, 31 patients (78%) with glaucoma had rates of mean sensitivity change within the range of healthy participants (ie, between -0.20 dB/y and 0.15 dB/y). Linear mixed-effects modeling revealed that the mean (SE) rate of mean sensitivity change in healthy participants was 0.003 (0.033) dB/y (95% CI, -0.062 to 0.068; P = .93). In comparison, patients with glaucoma had a mean (SE) rate of mean sensitivity change that was -0.032 (0.052) dB/y faster, but this difference was not statistically significant (95% CI, -0.134 to 0.070; P = .53). Among covariates, only baseline mean sensitivity was associated with the rate of mean sensitivity change (mean SE, 0.021 0.010 dB/y/dB; 95% CI, 0.002-0.041; P = .03).
The results of this cohort study suggest that over a median follow-up of more than 25 years, the rate of visual field change in patients receiving treatment for glaucoma was comparable to that of healthy individuals. These findings could guide practitioners in making management decisions.
To identify characteristics of patients with early open-angle glaucoma exhibiting greater macular perfusion density (PD) loss compared with macular ganglion cell layer (GCL) thickness loss.
...Cross-sectional study.
Optical coherence tomography (OCT) imaging of the optic nerve head and macula was conducted in patients and healthy control subjects. Minimum rim width, retinal nerve fiber layer and GCL thickness, and PD from OCT angiography were derived. Only high-quality images were included. For direct comparison, raw PD and GCL thickness values in patients were converted to relative age-corrected loss values based on data from controls. Demographic and ocular variables related to greater PD loss compared with GCL thickness loss were identified with multivariate logistic regression.
Data from 89 patients (median mean deviation with the 24-2 and 10-2 tests, Humphrey Field Analyzer: −1.96 dB and −1.49 dB, respectively) and 54 controls were analyzed. Sixty-three (71%) patients had relatively more GCL thickness loss, whereas 26 (29%) had relatively more PD loss. More PD loss was associated with lower OCT and OCT-angiography signal strength (odds ratio 95% confidence interval, 0.64 0.40, 0.96 and 0.60 0.38, 0.86, per dB, respectively), thicker retinal nerve fiber layer thickness (1.08 1.01, 1.16 per μm), and female sex (6.57 1.25, 48.79).
Less than one-third of patients with early glaucoma had more loss of perfusion compared with conventional structural loss in the macula. Even within a range of high-quality images, lower signal strength may be at least partially responsible for apparent perfusion loss.
To determine the impact of glaucoma severity on rates of change of minimum rim width (MRW), peripapillary retinal nerve fiber layer (RNFL), and macular ganglion cell layer (GCL) thickness.
...Prospective, cohort study.
Glaucoma patients and healthy subjects had optical coherence tomography scans at 6-month intervals. Individual rates of change for MRW, RNFL, and GCL thickness were estimated with ordinary least-squares regression. Linear mixed-effect models were used to estimate the rate of change of each parameter and evaluate the impact of glaucoma severity (expressed by visual field mean deviation, MD) and age on these rates.
A total of 132 glaucoma patients and 57 healthy subjects were followed for a median of 4.3 years and 3.7 years, respectively. Healthy subjects had a statistically significant deterioration in MRW (–1.66 µm/year), RNFL (–0.46 µm/year), and GCL thickness (–0.22 µm/year). While glaucoma patients had a faster rate of change in each parameter compared with healthy subjects, only GCL thickness showed a statistically significant group difference (mean difference: –0.17 µm/year; P = .03). Older baseline age was associated with faster GCL thickness change (–0.07 µm/year; P = .03), but not other parameters. Baseline MD had no impact on the subsequent rates of change in any of the parameters.
The rates of MRW, RNFL, and GCL thickness change were not significantly influenced by glaucoma severity at baseline; however, GCL thickness was able to statistically contrast the rate of change between healthy subjects and glaucoma patients throughout the disease spectrum.
Quantitative analysis of optical coherence tomography angiography (OCT-A) images requires a reproducible approach that accounts for sectoral loss. The objective of this study was to determine whether ...an index that accounts for both global (perfusion density, PD) and asymmetric loss of perfusion, rather than PD alone, more reliably measures loss of perfusion in patients with glaucoma.
We analysed macular OCT-A scans of 95 glaucoma patients and 59 control subjects. Two-dimensional projection images corresponding to the superficial vascular plexus were exported and analyses performed to calculate global PD and image asymmetry. An unsigned perfusion asymmetry index (PAI) that included PD and asymmetry (with 1:1 wt) was calculated. Perfusion density and PAI were compared with 10-2 visual field mean deviation and ganglion cell layer (GCL) thickness.
Median (IQR) visual field mean deviation was -1.73 (-3.76, 0.30) dB for the glaucoma group and 0.67 (0.16, 1.18) dB for the control group. The strength of the correlation with mean deviation was stronger for PAI (r=0.47), compared with PD (r=0.35), whereas with GCL thickness they were comparable (r=0.45 and 0.43, respectively). Compared with controls, mean PD was 12% lower in patients with glaucoma (0.27 vs 0.30), while PAI was 17% lower (0.40 vs 0.48). However, diagnostic accuracy of either PD or PAI was worse than GCL thickness.
While PAI yielded better correlation with mean deviation and GCL thickness, and a slightly improved separation between patients with glaucoma and healthy controls, diagnostic accuracy was inferior compared with GCL thickness.
