[Biomechanics of diabetic vitreopapillary traction syndrome]. / Biomekhanika diabeticheskogo vitreopapillyarnogo traktsionnogo sindroma.

Diabetic vitreopapillary traction syndrome (VPT) is a variant of diabetic retinopathy (DR) that can lead to vision loss in advanced stages. This review reports on the biomechanics of the vitreous in the pathogenesis of proliferative DR, in particular diabetic VPT. The article analyzes and summarizes literature data, presents the views of different authors on this problem, and provides the results of Russian and foreign scientific research on this pathology. It is concluded that further research in this area can lead to a significant improvement in the results of therapy, timely diagnosis, and preservation of vision in patients with DR.

Case of acute retinal necrosis with rapid progression to proliferative vitreoretinopathy: A case report.

RATIONALE: Acute retinal necrosis (ARN) was first reported in 1971 by Urayama et al as an acute uveitis accompanied by retinal arteritis and white retinal lesions in the peripheral retina that can progress to a rhegmatogenous retinal detachment (RRD). We have experienced a case of ARN that, unlike the common developmental course to an RRD associated with ARN, progressed to proliferative vitreoretinopathy (PVR) involving the entire retina in 2 days. The purpose of this report is to present our findings in the case of ARN with an atypical rapid time course. PATIENT CONCERNS: The patient was a 56-year-old woman who was treated for uveitis of unknown origin by her primary care physician. She was referred to our hospital because of a worsening of the fundus findings. DIAGNOSIS: Fundus examination in our hospital revealed vitreous opacities in the right eye, yellowish-white lesions extending around the retina, and some retinal hemorrhages. Because the retinal changes suggested ARN, we performed a polymerase chain reaction of the anterior atrial fluid and detected varicella-zoster virus. Then, the diagnosis of ARN was confirmed, and treatment was begun. At 1 month and a half after beginning the treatment, focal retinal traction was observed in the right fundus. Two days later, a circumferential PVR and a total retinal detachment were detected. INTERVENTIONS: We then performed vitrectomy with an encircling buckle and a silicone oil tamponade. OUTCOMES: Our examination 6 months postoperatively showed that the retina was attached and the BCVA was 20/200. LESSONS: Our findings of a case of ARN showed that the progression from a local vitreous traction to a full circumferential PVR can develop in 2 days.

Vitreous Olink proteomics reveals inflammatory biomarkers for diagnosis and prognosis of traumatic proliferative vitreoretinopathy.

Background: The aim of this study was to identify inflammatory biomarkers in traumatic proliferative vitreoretinopathy (TPVR) patients and further validate the expression curve of particular biomarkers in the rabbit TPVR model. Methods: The Olink Inflammation Panel was used to compare the differentially expressed proteins (DEPs) in the vitreous of TPVR patients 7-14 days after open globe injury (OGI) (N = 19) and macular hole patients (N = 22), followed by correlation analysis between DEPs and clinical signs, protein-protein interaction (PPI) analysis, area under the receiver operating characteristic curve (AUC) analysis, and function enrichment analysis. A TPVR rabbit model was established and expression levels of candidate interleukin family members (IL-6, IL-7, and IL-33) were measured by enzyme-linked immunosorbent assay (ELISA) at 0, 1, 3, 7, 10, 14, and 28 days after OGI. Results: Forty-eight DEPs were detected between the two groups. Correlation analysis showed that CXCL5, EN-RAGE, IL-7, ADA, CD5, CCL25, CASP8, TWEAK, and IL-33 were significantly correlated with clinical signs including ocular wound characteristics, PVR scoring, PVR recurrence, and final visual acuity (R = 0.467-0.699, p < 0.05), and all with optimal AUC values (0.7344-1). Correlations between DEP analysis and PPI analysis further verified that IL-6, IL-7, IL-8, IL-33, HGF, and CXCL5 were highly interactive (combined score: 0.669-0.983). These DEPs were enriched in novel pathways such as cancer signaling pathway (N = 14, p < 0.000). Vitreous levels of IL-6, IL-7, and IL-33 in the rabbit TPVR model displayed consistency with the trend in Olink data, all exhibiting marked differential expression 1 day following the OGI. Conclusion: IL-7, IL-33, EN-RAGE, TWEAK, CXCL5, and CD5 may be potential biomarkers for TPVR pathogenesis and prognosis, and early post-injury may be an ideal time for TPVR intervention targeting interleukin family biomarkers.

ADDITIONAL PNEUMATIC RETINOPEXY IN PATIENTS WITH PERSISTENT RETINAL DETACHMENT AFTER SCLERAL BUCKLING.

PURPOSE: To investigate the efficacy, safety, and indications for additional pneumatic retinopexy (PR) in patients with persistent retinal detachment after scleral buckling. METHODS: This retrospective study included patients who underwent additional PR after scleral buckling for primary rhegmatogenous retinal detachment (n = 78). We defined "inadequate buckle" as retinal detachment persistence because of low buckle height despite accurate buckle placement and "buckle misplacement" as an uncovered tear because of incorrect buckle placement. RESULTS: The anatomical success rate after additional PR was 52.6%. Development of proliferative vitreoretinopathy Grade B (hazard ratio, 5.73; P < 0.001) and inferior retinal tears (hazard ratio, 2.12; P = 0.040) were significant risk factors for anatomical failure. The most common cause of anatomical failure was proliferative vitreoretinopathy (19 of 37; 51.4%), and epiretinal membrane formation was a common complication after additional PR (22 of 78; 28.2%). The anatomical success rate with additional PR was significantly higher in the inadequate buckle group than in the misplacement group (8 of 9 [88.9%] vs. 1228 [42.9%]; P = 0.023). CONCLUSION: Development of proliferative vitreoretinopathy Grade B and inferior retinal tears were significantly associated with anatomical failure after additional PR. Additional PR may benefit patients with superior retinal tears or low buckle height and those without proliferative vitreoretinopathy.

Vitreous Biomarkers for Proliferative Vitreoretinopathy Prognostication in Patients Undergoing Primary Retinal Detachment Repair.

Purpose: To compare baseline levels of exploratory biomarkers in the vitreous fluid of patients with primary retinal detachment who subsequently develop proliferative vitreoretinopathy (PVR) versus those who do not. Methods: In this exploratory case-control study, we evaluated the baseline protein biomarker levels from a biobank containing the vitreous fluid of patients who had undergone primary pars plana vitrectomy (PPV) for rhegmatogenous retinal detachment. Undiluted samples were collected at the time of PPV and stored at -80°C. Samples from 13 patients who developed PVR within 6 months (PVR group) and 13 age- and gender-matched controls who did not develop PVR (control group) were included. Protein abundance levels were evaluated using a proximity extension assay, and a confirmatory enzyme-linked immunosorbent assay (ELISA) was used to measure the concentration of vimentin. Results: Baseline vimentin (Normalized Protein eXpression [NPX], 8.6 vs. 6.4, P < 0.0001) and heme oxygenase 1 (NPX 8.9 vs. 7.0, P < 0.001) levels were found to be elevated in vitreous fluid of patients who subsequently developed PVR compared to those who did not. Confirmatory analysis using ELISA demonstrated mean vimentin concentrations of 7254 vs. 2727 ng/mL in the PVR versus control groups (P = 0.0152). The odds ratio for developing PVR was 14 (confidence interval, 1.4-168; P = 0.03), assuming a baseline vimentin threshold of 7500 ng/mL. Conclusions: Vimentin is an intermediate filament protein expressed by retinal glial cells, and our data combined with prior evidence suggest that it may serve as an early vitreous biomarker for subsequent PVR formation and reactive gliosis. Furthermore, we found, for the first time, elevated baseline levels of heme oxygenase 1, a measurable indicator of oxidative stress. Translational Relevance: Our positive findings could impact clinical care for retinal detachment patients by facilitating risk stratification for targeted interventions or closer monitoring in those at the highest risk of developing PVR.

Prevalence of vitreoschisis-induced vitreous cortex remnants over the peripheral retinal surface in eyes undergoing vitrectomy for primary rhegmatogenous retinal detachment.

PURPOSE: Unremoved vitreoschisis-induced vitreous cortex remnants over the peripheral retinal surface posterior to the vitreous base (pVCR) may increase the risk of surgical failure after primary rhegmatogenous retinal detachment (RRD) repair. The purpose of this study was to validate our previous findings on pVCR prevalence during vitrectomy for RRD and to examine their association with proliferative vitreoretinopathy (PVR) and surgical failure. METHODS: Prospective observational multisurgeon study of 100 eyes of 100 consecutive patients who underwent vitrectomy for RRD by one of four vitreoretinal surgeons. Collected data included detected pVCR and known PVR risk factors. Pooled analysis with our previous retrospective study (251 eyes of 251 patients) was also performed. RESULTS: Initial PVR (≥C) was present and removed in 6/100 (6%) patients, pVCR were detected in 36/100 (36%) patients, pVCR were removed in 30/36 (83%) patients with pVCR, and 4/36 (11%) patients with pVCR were high myopes (≤-6D). Six per cent (6/100) developed a retinal redetachment, of which 3/6 (50%) had initial PVR (≥C). Surgical failure rates in eyes with and without pVCR were 17% (6/36) and 0% (0/64), respectively. In eyes with pVCR and surgical failure, pVCR were not or not completely removed during the first surgery. Overall analysis showed that pVCR were statistically significantly associated with PVR. CONCLUSIONS: This study confirms our previous findings: a pVCR prevalence of around 35% and an association between pVCR, PVR formation and surgical failure in patients undergoing vitrectomy for RRD. More research is needed to determine which patients would benefit most from pVCR removal.

Proliferative vitreoretinopathy: an update on the current and emerging treatment options.

Proliferative vitreoretinopathy (PVR) remains the main cause of failure in retinal detachment (RD) surgery and a demanding challenge for vitreoretinal surgeons. Despite the large improvements in surgical techniques and a better understanding of PVR pathogenesis in the last years, satisfactory anatomical and visual outcomes have not been provided yet. For this reason, several different adjunctive pharmacological agents have been investigated in combination with surgery. In this review, we analyze the current and emerging adjunctive treatment options for the management of PVR and we discuss their possible clinical application and beneficial role in this subgroup of patients.

Autosomal dominant neovascular inflammatory vitreoretinopathy with CAPN5 c.731T > C gene mutation; clinical management of a family cohort and review of the literature.

BACKGROUND: To report a cohort of patients with clinically and genetically diagnosed autosomal dominant neovascular inflammatory vitreoretinopathy (ADNIV) and showcase the spectrum of the disease utilizing multimodal imaging and genetic testing. Additionally, the utility of multimodal imaging in guiding treatment will also be illustrated. MATERIALS/METHODS: Five patients from a single-family pedigree in Ohio with clinical signs of ADNIV were evaluated. Medical history, family history, and complete ocular examinations were obtained during regular clinic visits. Multimodal imaging including ocular coherence tomography, fluorescein angiography, wide-field fundus photographs, and Humphrey visual field testing was obtained for all five patients. Additionally, genetic testing for the Calpain-5 (CAPN5) gene was conducted on all patients. RESULTS: All five patients were noted to have a CAPN5 c.731T > C (p.L244P) mutation on genetic testing. Using multimodal imaging to supplement the clinical examination, pathologic changes such as retinal vascular inflammation, macular edema, and tractional retinal membranes were well illustrated and monitored over time. This allowed for earlier intervention when appropriate such as with intraocular steroid or systemic anti-inflammatory treatments. CONCLUSION: Phenotypic presentation varied among patients in this series, but is consistent with the spectrum of pathologic changes previously described in patients with other CAPN5 gene mutations. Monitoring of patients with ADNIV utilizing multimodal imaging can help better assess progression of this disease and guide treatment decisions. Additionally, increased genetic testing in patients with inherited retinal diseases may reveal novel gene mutations that could serve as potential targets for future genetic treatment regimens.

Intravitreal Injection of Bevacizumab for the Prevention of Postoperative Proliferative Vitreoretinopathy in High-Risk Patients Selected by Laser Flare Photometry.

INTRODUCTION: To evaluate the effect of an intravitreal injection of bevacizumab at the time of rhegmatogenous retinal detachment (RRD) surgery, on postoperative proliferative vitreoretinopathy (PVR) in high-risk patients selected by laser flare photometry. METHODS: This single-center observational retrospective cohort study included 137 consecutive patients who underwent pars plana vitrectomy and gas tamponade for primary RRD with increased aqueous flare between July 2016 and June 2021. From June 2019, an intravitreal injection of bevacizumab was administered as an adjunct to RRD repair. Patients who underwent surgery before this time and who did not receive intravitreal bevacizumab served as controls. The main outcome was the rate of retinal redetachment due to PVR. RESULTS: The median flare value was 22.0 (16.5-36.5) pc/ms in the control group and 28.2 (19.7-41.0) pc/ms in the bevacizumab group (p = 0.063). Eyes treated with bevacizumab were more likely to have macula-off RRD (p = 0.003), grade B PVR (p = 0.038), and worse visual acuity (p = 0.004) than controls. The rate of PVR redetachment was significantly lower in the bevacizumab group (11.1%) than in the control (30.1%) (p = 0.012). This difference was more pronounced after adjusting for potential confounding factors (p = 0.005); the risk of developing PVR was 4.5-fold higher in controls (95% CI, 1.6-12.8). After adjustment, the final median visual acuity was also significantly higher in eyes treated with bevacizumab (p = 0.025). CONCLUSION: This pilot study provides preliminary evidence that bevacizumab may reduce the risk of PVR-related recurrent RRD and improve visual outcomes in high-risk patients selected by laser flare photometry.

UTILIZATION OF PREOPERATIVE MIDPERIPHERAL OPTICAL COHERENCE TOMOGRAPHY FOR TAILORED SURGICAL MANAGEMENT OF PROLIFERATIVE VITREORETINOPATHY.

PURPOSE: The purpose of this study was to report on the use of preoperative spectral domain optical coherence tomography to assess retinal pathology and guide the surgical approach to proliferative vitreoretinopathy. METHODS: A case report was discussed. RESULTS: A 70-year-old man developed proliferative vitreoretinopathy after surgical repair of a macula-off rhegmatogenous retinal detachment. In preparation for further surgery, inferior preretinal fibrosis and membranes were identified on preoperative optical coherence tomography. The patient underwent successful vitrectomy with peeling of the membranes resulting in markedly improved visual acuity. CONCLUSION: Widely available spectral domain optical coherence tomography can be used preoperatively to image the midperipheral retina and guide surgical decision-making in the management of proliferative vitreoretinopathy.

Primary Retinal Detachment Repair in Eyes Deemed High Risk for Proliferative Vitreoretinopathy: Surgical Outcomes in 389 Eyes.

PURPOSE: To evaluate surgical outcomes in eyes with primary rhegmatogenous retinal detachment (RRD) deemed at high risk for postoperative proliferative vitreoretinopathy (PVR). DESIGN: Retrospective, consecutive case cohort study. PARTICIPANTS: Eyes undergoing primary RRD repair with pars plana vitrectomy (PPV) or combined PPV with scleral buckling (PPV/SB) between January 1, 2016, and December 30, 2017, at Wills Eye Hospital. METHODS: Eyes were defined as "high risk" if ≥ 1 of the following risk factors for PVR was present on preoperative examination: preoperative PVR grade A or B, vitreous hemorrhage, RRD involving ≥ 50% of retinal area, presence of ≥ 3 retinal breaks, history of prior cryotherapy, presence of choroidal detachment, or duration of RRD > 2 weeks. Surgical failure was defined as an additional intervention required for the retinal reattachment. MAIN OUTCOMES MEASURES: Single surgery attachment success (SSAS) rate 3 months after first surgical intervention for primary RRD. RESULTS: Of 2053 reviewed charts, a total of 389 eyes (18.9%) met the definition of high risk and were included in the analysis. Mean patient age was 63.5 years. PPV/SB was performed in 125 (32.1%) eyes and PPV alone in 264 (67.9%) eyes. SSAS rate of the overall cohort was 71.5% at 3 months. SSAS rate was significantly higher in eyes treated with PPV/SB compared with PPV (80.8% vs. 67%, respectively, P = 0.006). On multivariate analysis, use of PPV/SB was the only feature associated with SSAS (odds ratio, 2.04; 95% confidence interval, 1.12-3.69, P = 0.019). CONCLUSION: In eyes with primary RRD and risk factors for PVR, overall SSAS was 71.5% after primary repair. In this cohort, use of PPV/SB was associated with a significantly higher SSAS compared with PPV alone. FINANCIAL DISCLOSURE(S): Proprietary or commercial disclosure may be found in the Footnotes and Disclosures at the end of this article.

Effects of internal limiting membrane peeling on anatomical and functional outcomes in macula-off rhegmatogenous retinal detachment complicated by proliferative vitreoretinopathy: Japan-Retinal Detachment Registry.

PURPOSE: To investigate the effects of internal limiting membrane (ILM) peeling on retinal attachment after a single surgery, and on postoperative visual acuity (VA) at 6 months, in eyes with macula-off rhegmatogenous retinal detachment (RRD) complicated by proliferative vitreoretinopathy (PVR). STUDY DESIGN: Nationwide, multicenter retrospective cohort study. METHODS: The Japan-RD Registry database was used for analysis of patients who had undergone vitrectomy for macula-off RRD complicated by PVR. Multivariate analysis was performed to detect prognostic factors for retinal attachment after a single surgery and for VA at 6 months postoperatively. Retinal attachment after a single surgery or VA at 6 months postoperatively was the objective variable; ILM peeling, preoperative VA, PVR grade, age, and intraocular pressure were explanatory variables. RESULTS: Eighty-nine eyes met the inclusion criteria; ILM peeling was performed in 25 eyes (28%). Preoperative VA was significantly associated with retinal attachment, but ILM peeling did not (odds ratios = 2.1 and 1.3, respectively; p = 0.009 and 0.67, respectively). Poor preoperative VA and younger patient age were significantly associated with poor postoperative VA, but ILM peeling was not (ß-values = 0.37, -0.008, and 0.15, respectively; p < 0.001, p = 0.02, and p = 0.15, respectively. CONCLUSIONS: Preoperative VA was a risk factor associated with retinal attachment. Preoperative VA and patient age were risk factors associated with postoperative poor VA. In eyes with macula-off RRD complicated by PVR, ILM peeling did not have a clear beneficial effect on anatomical and functional outcomes, suggesting that it may be unnecessary for eyes with this condition.

Use of Heavy Silicon Oil as Intraocular Tamponade for Inferior Retinal Detachment Complicated by Proliferative Vitreoretinopathy: A Multicentric Experience.

INTRODUCTION: This is a multicentric study on the use of heavy silicon oil (HSO) as an intraocular tamponade for inferior retinal detachment (RD) complicated by proliferative vitreoretinopathy (PVR). METHODS: 139 eyes treated for RD with PVR were included in the study. 10 (7.2%) were affected by primary RD with inferior PVR, while 129 (92.8%) were affected by recurrent RD with inferior PVR. 102 eyes (73.9%) had received a silicon oil (SO) tamponade in a previous intervention prior to receiving HSO. Mean follow-up was 36.5 (standard deviation = 32.3) months. RESULTS: The median interval between HSO injection and removal was 4 months (interquartile range: 3). At the time of HSO removal, the retina was attached in 120 eyes (87.6%), whereas in 17 eyes (12.4%), it had re-detached while the HSO was in situ. 32 eyes (23.2%) showed recurrent RD. A subsequent RD relapse was observed in 14.2% of cases with no RD at the time of HSO removal, and in 88.2% if an RD was present at the time of HSO removal. Advancing age showed a positive association with retinal attachment at the end of follow-up, while the risk of RD relapse at the end of the follow-up showed a significant negative association with HSO tamponade duration and with the use of SO rather than air or gas as post-HSO tamponade materials. Mean best corrected visual acuity was 1.1 logarithm of minimum angle of resolution at all follow-up time points. 56 cases (40.3%) needed treatment for elevated intraocular pressure (IOP), with which no clinically relevant variables were associated during follow-up. CONCLUSION: HSO represents a safe and effective tamponade in cases of inferior RD with PVR. The presence of RD at the time of HSO removal is a negative prognostic factor for the development of a subsequent RD relapse. According to our findings, in cases of RD at the time of HSO removal, a short-term tamponade should definitely be avoided, in favor of SO. Special attention must be paid to the risk of IOP elevation, and patients should be closely monitored.

Bilateral Proliferative Retinopathy as the Initial Presentation of Atypical Hemolytic Uremic Syndrome: A Case Report.

In this case report, we describe a 34-year-old male patient who presented with vision loss and was found to have profound occlusive retinal vasculopathy. His initial laboratory studies were unremarkable, but five weeks after his ocular symptoms began, he developed acute multi-organ failure and was ultimately diagnosed with atypical hemolytic uremic syndrome (aHUS). His course was complicated by a stroke, respiratory distress requiring intubation, long-term hemodialysis, and eventually death. Occlusive retinal vasculopathy may be the presenting finding in aHUS, although thrombotic microangiopathy syndromes typically present with acute kidney injury and or failure, hemolytic anemia, and thrombocytopenia. [Ophthalmic Surg Lasers Imaging Retina 2023;54:297-300.].

Proliferative Vitreoretinopathy Following Transscleral Diode Cyclophotocoagulation.

PRCIS: Transscleral diode laser cyclophotocoagulation may trigger the development of proliferative vitreoretinopathy. Our article demonstrates one such case leading to tractional macula-off retinal detachment in a child with aphakic glaucoma. PURPOSE: The purpose of this article is to describe a case of proliferative vitreoretinopathy (PVR) developing subsequent to transscleral diode laser cyclophotocoagulation (cyclodiode) in a pediatric patient with aphakic glaucoma. PVR most commonly occurs following rhegmatogenous retinal detachment repair; however, to the best of our knowledge, it has never been reported to appear after cyclodiode. METHODS: Retrospective evaluation of case presentation and intraoperative findings. RESULTS: A 13-year-old girl with aphakic glaucoma presented 4 months after cyclodiode of the right eye with a retrolental fibrovascular membrane and anterior PVR. The PVR extended posteriorly over the next month, after which the patient developed a tractional macula-off retinal detachment. Pars Plana vitrectomy was performed, confirming dense anterior and posterior PVR. A review of the literature suggests that an inflammatory cascade, similar to that seen in PVR development following rhegmatogenous retinal detachment, may occur from the destruction of the ciliary body by cyclodiode. As a result, fibrous transformation may occur, likely accounting for the cause of PVR development in this case. CONCLUSION: The pathophysiology of PVR development remains unclear. This case demonstrates that PVR may occur following cyclodiode and should be considered during postoperative monitoring after this procedure.

Low-Dose Intravitreal Methotrexate for Proliferative Vitreoretinopathy.

BACKGROUND AND OBJECTIVE: Proliferative vitreoretinopathy (PVR) has been mitigated by intravitreal methotrexate (MTX) 400 µg/0.1 mL in several studies. Here, we evaluate the results from a lower dose of MTX, 200 µg/0.05 mL. MATERIALS AND METHODS: We identified and reviewed records of patients with grade ≥C1 PVR who were treated with 200 µg/0.05 mL MTX injections: during PVR surgery and every 2 weeks thereafter. RESULTS: Twenty-four eyes met inclusion criteria with a mean of 5.6 injections and follow-up ranging 6 to 56 months. The retina was reattached in 19 of 24 eyes (79%) after a single surgery and in 5 of 24 eyes (21%) after one additional PVR surgery. Visual acuity improved from baseline logMAR 1.63 to 0.97 at 12 months (P < .001), with 5 of 20 achieving 20/60 or better and 16 of 20 achieving 20/200 or better. One eye developed a transient corneal abrasion that resolved within 1 week. CONCLUSION: Low-dose MTX (200 µg/0.05 mL) during and after PVR surgery resulted in good rates of retinal reattachment and visual acuity recovery. [Ophthalmic Surg Lasers Imaging Retina 2023;54(3):139-146.].

Risk of Tertiary, Quaternary, and Quinary Proliferative Vitreoretinopathy: Analysis of a Nationwide Database (2010-2017).

OBJECTIVE: Primary proliferative vitreoretinopathy (PVR) is established as an important cause of the failed repair of a fresh retinal detachment (RD) and the consequent need for secondary repair. However, the burden of multiple repairs beyond the initial failure has not been studied in detail. We aimed to determine the association between primary PVR and the occurrence of tertiary, quaternary, and quinary RD repairs, using a nationwide database. DESIGN: Retrospective cohort study of insurance claims. SUBJECTS: Cases of rhegmatogenous RD that underwent primary surgical repair. METHODS: Cases of primary RD repair from 2010 to 2017 were categorized based on the absence (P0 group) or presence (P1 group) of primary PVR. In each group, we analyzed the frequency of subsequent RD repair procedures with concurrent PVR. MAIN OUTCOME MEASURE: The risk of secondary and higher multiples of PVR-associated RD repair. RESULTS: A total of 27 137 cases were included, with 24 500 (90.3%) in the P0 group and 2637 (9.7%) in the P1 group. The frequency (%) of cases ultimately requiring secondary, tertiary, quaternary, and quinary repair in P0 versus P1 was 1.88 versus 10.24 (P < 0.001), 0.26 versus 2.50 (P < 0.001), 0.07 versus 0.64 (P < 0.001), and 0.03 versus 0.08 (P = 0.272), respectively. The risk of undergoing secondary repair was higher in the P1 than in the P0 group (hazard ratio [HR], 6.02; 95% confidence interval [CI], 5.24-6.92; P < 0.001). The risk of undergoing tertiary repair was also higher in the P1 than in the P0 group (HR, 1.67; CI, 1.23-2.28; P = 0.001). There was no difference in the risk of undergoing quaternary repair between the groups (HR, 0.76; CI, 0.41-1.40; P = 0.37). Senary repairs were not detected in this dataset. CONCLUSIONS: Primary PVR may increase the risk of requiring multiple sequential retinal reattachment surgeries beyond the initial repair failure. Retinal detachment cases with primary PVR at the initial presentation of RD were more likely to undergo secondary and tertiary repairs than cases without primary PVR. Health care claims analysis may be a useful tool to study population-based estimates for multiple recurrences of RD in cases with PVR. FINANCIAL DISCLOSURE(S): Proprietary or commercial disclosure may be found after the references.

Risk factors for epiretinal membrane in eyes with primary rhegmatogenous retinal detachment that received silicone oil tamponade.

BACKGROUND/AIMS: This study investigated the risk factors for epiretinal membrane (ERM) in eyes with primary rhegmatogenous retinal detachment (RRD) that received silicone oil (SO) tamponade. METHODS: This retrospective analysis included 1140 patients (1140 eyes) with RRD who underwent primary vitrectomy and SO tamponade. The prevalence of ERM was estimated and possible risk factors (eg, type 2 diabetes, proliferative vitreoretinopathy (PVR), SO tamponade time (SOTT), photocoagulation, vitreous haemorrhage, choroidal detachment, cryotherapy and retinal tear size) were analysed via multiple logistic regression. RESULTS: The prevalence of ERM was 12.3% (140/1140), and the accuracy of preoperative ERM diagnosis was 40.5%. Multivariate logistic regression analysis showed that risk factors for ERM in eyes with SO tamponade included preoperative PVR (OR=4.336, 95% CI 2.533 to 7.424, p<0.001), type 2 diabetes (OR=3.996, 95% CI 2.013 to 7.932, p<0.001), photocoagulation energy (OR=1.785, 95% CI 1.306 to 2.439, p<0.001) and SOTT (OR=1.523, 95% CI 1.261 to 1.840, p<0.001). No statistically significant associations were observed between the incidence of ERM and other risk factors. Preoperative PVR showed the strongest association with risk of ERM. The risk of ERM was positively associated with SOTT, photocoagulation energy and preoperative PVR grade. CONCLUSION: In eyes with RRD that received SO tamponade, the prevalence of ERM was 12.3%, while the accuracy of preoperative ERM diagnosis was low. Preoperative PVR, type 2 diabetes, photocoagulation energy and SOTT were the main risk factors for ERM.