A Review of Surgical Outcomes and Advances for Macular Holes

Petaloid technique and prognostic significance of macular hole shapes by optical coherence tomography for full thickness macular hole

Surgical advancements for full-thickness macular hole (FTMH) treatment include vitrectomy, membrane peeling, and the inverted flap technique (IFT). IFT, which involves inverting the internal limiting membrane (ILM) flap over the macular hole (MH) or into the MH, improves success rates and visual recovery. However, issues like mis-aspiration during flap handling have been problematic. We introduce the petaloid technique, to position the ILM flap under air during FTMH surgery to evaluate its outcomes. This retrospective study included 28 eyes, with a mean minimum linear diameter (MLD) 472.04 ± 199.7 μm and basal diameter (BD) of 834.95 ± 593.54 μm. Primary closure of MH was achieved in 96.42% of patients, with 3.57% showing persistent MH during the 6-month follow-up. The VA improved significantly from preoperative levels at each postoperative stage, with notable increases at 3 months (0.86 ± 0.49 logMAR; p = 0.0132) and 6 months (0.77 ± 0.41 logMAR; p = 0.000081). The new closure patterns showed Type A in 28.6%, B in 14.3%, C in 28.6%, and D in 25%. Among different types of closure patterns, although VA improved in all types, significant improvement in VA was noted for type A and type C, with notable improvements at the 6-month follow-up for Type A (0.60 ± 0.23 logMAR; p = 0.02) and at the 1-month follow-up for Type C (0.62 ± 0.28 logMAR; p = 0.02). For macular hole retinal detachment in 5 eyes, the average preoperative VA was 1.86 ± 0.19 logMAR, while the final mean postoperative VA showed a significant improvement to 1.1 ± 0.40 logMAR (p = 0.021, paired t-tests). Retinal reattachment was achieved in all cases (5/5) without recurrent detachment post-silicone oil removal. For the prognostic significance of MH shapes identified by OCT, it can be concluded that the shape of macular holes significantly influences visual acuity outcomes at 6 months post-surgery (p = 0.037). The shape of macular holes, particularly Flask-shaped, significantly impacts visual acuity compared to other shape. The modified petaloid technique for treating FTMH proved safe and effective, with no significant complications noted.

Assessment of Macular Hole Closure Speed Using Trans-tamponade OCT and 3-Dimensional Macular Hole Segmentation in the DISCOVER Study

Introduction: To explore opportunities for individualized postoperative positioning duration in macular hole (MH) surgery. Methods: This post hoc analysis comprised eyes that had full-thickness MH (FTMH) repair in the prospective DISCOVER intraoperative optical coherence tomography (OCT) study. Preoperative spectral-domain OCT (SD-OCT) and postoperative day 1 (POD1) trans-tamponade OCT were analyzed. Preoperative SD-OCT macular cubes were imported and analyzed using a machine learning-enhanced segmentation platform. Nine preoperative segmentation parameters were analyzed (maximum foveal height, apex area, base area, central foveal area, maximum apex diameter, maximum base diameter, maximum depth, minimum foveal width, volume). In addition, 2 new metrics-the macular hole index and tractional hole index-were calculated. POD1 trans-tamponade OCTs were obtained and evaluated for hole closure. Results: Of the 66 eyes with an FTMH, 16 (24%) had a chronic MH and 5 (8%) were reoperations from FTMH nonclosure after previous surgery. Nine eyes (14%) had an open MH on POD1 trans-tamponade OCT (6 chronic MHs [66%]; 2 reoperations [22%]); the remaining 57 MHs (86%) were closed. Multiple segmentation parameters were significantly associated with POD1 closure. Conclusions: Volumetric MH measurements and trans-tamponade POD1 OCT closure status are important in predicting MH closure speed and the need for postoperative positioning. Individualized positioning duration in MH could lower perioperative morbidity and vastly enhance quality of life.

Factors influencing the reliability of measurements in eyes with full-thickness macular holes: are we measuring incorrectly?

PURPOSE

The calliper function is used for manual measurements of full thickness macular holes (FTMHs). We aimed to investigate whether a reproducible difference could be detected beyond interobserver variability between two commonly used manufacturers in their manual calliper facility in spectral domain optical coherence tomography (OCT) for metrics related to FTMH.

METHODS

This is a non-interventional, retrospective, observational study. Two independent observers examined 8 eyes (16 OCT) scans and 128 measurements (minimal linear diameter (MLD), basal diameter and hole height on both sides) of FTMHs, taken on Heidelberg Spectralis and Topcon Triton (OCT machines). The interobserver agreement and OCT machine agreement of measurements were analysed by Bland-Altman plots and intraclass correlation coefficient (ICC) analysis. Spectralis and Triton had 125 µm and 50 µm horizontal b-scan spacing, respectively.

RESULTS

Overall, we report high absolute agreement in interobserver (ICC 0.991 (95% CI 0.985 to 0.995, p<0.001)) and OCT machine (ICC 0.993 (95% CI 0.987 to 0.996, p<0.001)) variability. Lower horizontal resolution in Triton compared with Spectralis leads to interobserver variability, in smaller horizontal measurements. Lower horizontal scanning density in Spectralis lead to relatively large interobserver variation if different reference scans were chosen, and consistently smaller MLD measurements than Triton. Vertical measurements without 1:1 scaling lead to inaccurate exaggerated oblique vertical measurements. Calliper function appears otherwise identically calibrated.

CONCLUSIONS

We report excellent interobserver and OCT machine agreement in measurements. However, the paper shows several factors that could influence the reliability of measurements acquired in eyes with FTMHs, such as the dimension of the hole as well as different image resolution, density scanning protocols or vertical scaling of the OCT machines viewing platform.

Analysis of the progression rate of idiopathic macular holes and the optimal cut-off for baseline minimum linear diameter and base diameter

PURPOSE

To determine the cut-off points of minimum linear diameter (MLD) and base diameter (BD) at which the progression rate of idiopathic full-thickness macular holes (MHs) decreases before vitrectomy.

STUDY DESIGN

A retrospective study.

METHODS

We investigated the differences in MLD and BD between baseline and operation days in patients with stages 2, 3, and 4 MHs using optical coherence tomography (OCT). Each difference in OCT parameters was divided by the time interval to calculate the MH progression rates and the cut-off points of MLD and BD.

RESULTS

Overall, 269 patients (282 eyes) were included. It took an average of 36.02 ± 24.69 (7-197) days from baseline to operation. MLD and BD progressed faster in stages 2 and 3 without posterior vitreous detachment (PVD) than in stage 4 with PVD (MLD: p < 0.001 and p = 0.007; BD: p < 0.001 and p = 0.019, respectively). Simple linear regression showed the relationship between baseline MLD and BD, and the progression rate; the progression rate decreased as baseline MLD (p = 0.004) and BD increased ( p < 0.001). For baseline MLD and BD, the cut-off points where the progression rate decreased were 306.0 and 470.0 μm, respectively.

CONCLUSION

The group without PVD progressed faster than the group with PVD. Moreover, the progression rates were faster in MHs with MLD < 306.0 μm and BD < 470.0 μm. In these patients, vitrectomy without delay is expected to improve the visual prognosis.

Prediction of foveal microstructure and visual outcomes following surgery for idiopathic macular hole: An assessment using spectral-domain optical coherence tomography

PURPOSE

To evaluate the efficacy of two novel indices, the hole closure index (HCI) and the hole healing index (HHI), in predicting both the anatomic outcome and postoperative visual acuity following surgical intervention for idiopathic macular holes.

METHODS

A total of 38 patients diagnosed with idiopathic macular hole (IMH) were included. All patients underwent standard surgical treatment, including vitrectomy, internal limiting membrane (ILM) peeling, and gas tamponade. Preoperative and postoperative spectral-domain optical coherence tomography (SD-OCT) was utilized to assess the anatomical status of the macular hole (MH). The maximum distance between the tips of the external limiting membrane (ELM) was designated as the hole size (HS). HHI, calculated as the ratio of hole height to HS, and HCI, calculated as the ratio of hole height to the average of minimum diameter and base diameter, were determined. Postoperative reconstruction of ELM and ellipsoid zone (EZ) was evaluated, along with analysis of best-corrected visual acuity (BCVA) on a logarithm of the minimum angle of resolution (logMAR) scale. Regression analysis was performed to evaluate the relationship between anatomical outcomes, postoperative visual acuity, and optical coherence tomography (OCT) parameters. Receiver operating characteristic (ROC) curves were generated for both HHI and HCI.

RESULTS

Regression analyses revealed significant correlations between HCI and the restoration of ELM and EZ at 6 months after surgery (P = 0.002 and P = 0.014, respectively). In addition, a significant correlation was found between HHI and postoperative BCVA better than logMAR 0.52 also at 6 months after surgery (P = 0.033). The area under the ROC curve (AUC) for HCI based on ELM and EZ reconstruction was high, with values of 0.942 and 0.842, respectively. AUC for HHI, determined by ROC curve analysis of postoperative BCVA, was 0.704.

CONCLUSIONS

In conclusion, our findings indicate that HCI may be the most accurate predictor of type 1 closure, while HHI could be considered a potential predictor of postoperative visual acuity.

THE LONG-TERM FOLLOW-UP OF AUTOLOGOUS BLOOD CLOT-ASSISTED LYOPHILIZED HUMAN AMNIOTIC MEMBRANE COVERING TREATMENT UNCLOSED MACULAR HOLE

PURPOSE

The objectives were to assess the long-term morphologic and functional outcome of eyes with unclosed macular hole (MH) in which the internal limiting membrane has been peeled in previous vitrectomy with autologous blood clot-assisted lyophilized human amniotic membrane (LhAM) graft covering.

METHODS

Twelve eyes with MH unclosed in previous surgery were selected and studied. Autologous blood clot-assisted LhAM graft was used to cover the MH in vitrectomy. The main clinical outcomes including best-corrected visual acuity, closure of MH, and the outcome of LhAM graft were recorded.

RESULTS

The mean minimum diameter of the MH was 641.7 ± 245.9 µ m and the mean axial length was 27.3 ± 3.50 mm. The LhAM graft was maintained in the former position and all the MH closed in 10 eyes, whereas the graft slipped and the MH unclosed in two eyes. The MH closure rate was 83.3% and the mean best-corrected visual acuity improved significantly from 1.47 ± 0.58 logMAR (Snellen 20/590) preoperatively to 1.17 ± 0.60 logMAR (Snellen 20/296) postoperatively. During 18 to 36 months follow-up, LhAM grafts were attached to the retinal surface in nine eyes, detached from the retinal surface in one eye, dislocated from the fovea in one eye, and inserted into the retina in one eye; and macular atrophy occurred in one eye.

CONCLUSION

Autologous blood clot-assisted LhAM graft covering provided a simple and effective treatment option for unclosed MH and reduce surgical trauma. Although the graft remained on the macular surface for a long time, it did not affect the recovery of MH and postoperative vision.

Role of Positioning after Full-Thickness Macular Hole Surgery: A Systematic Review and Meta-Analysis

TOPIC

The importance of postoperative face-down positioning (FDP) to achieve anatomic and functional success after full-thickness macular hole (FTMH) surgery is explored in this meta-analysis of randomized controlled trials (RCTs).

CLINICAL RELEVANCE

There is considerable variability in clinical practices regarding the need and length of FDP recommended to patients after FTMH surgery. There is also a lack of robust clinical guidelines on the topic. As such, an updated estimate of the effect size of FDP on clinically important outcomes is critical to inform practice.

METHODS

Ovid MEDLINE, EMBASE, CENTRAL, and SCOPUS databases were searched from inception to October 3, 2021, for RCTs evaluating FDP versus non-FDP (nFDP). Data were collected for 7 clinically important outcomes after macular hole surgery: closure rate, visual acuity (VA) improvement, recurrence of FTMH, visual function, quality of life, patient satisfaction, and complication rates. We used the Cochrane risk-of-bias tool for randomized trials (RoB 2) to assess the risk of bias and followed the Grade of Recommendations, Assessment, Development, and Evaluation (GRADE) approach to assess the certainty in the evidence across outcomes. We conducted meta-analyses using random-effects modeling. Subgroup analyses were carried out based on hole size, type of gas, and duration of FDP.

RESULTS

Eight RCTs of 709 eyes were included. The relative risk (RR) of FTMH closure rate comparing FDP versus nFDP was RR 1.05 (95% confidence interval [CI]: 0.99, 1.12, P = 0.09, I² = 44%, GRADE rating: LOW). The mean difference (MD) regarding VA improvement comparing FDP and nFDP was MD -0.07 (95% CI: -0.12 to 0.01, P = 0.03, I² = 16%, GRADE rating: LOW).

CONCLUSION

The current review did not demonstrate a difference between FDP and nFDP with respect to FTMH closure, although the CIs were wide. There was a visual benefit to FDP; however, the CIs included values of trivial clinical significance. Subgroup analyses demonstrated that the VA benefit observed was driven by large holes. Limited data precluded analysis regarding the rate of FTMH recurrence, measures of visual function, quality of life measures, and patient satisfaction metrics. Further prospective trials are required to assess the gaps in the literature and improve the certainty of evidence for the outcomes examined.

Internal limiting membrane peeling in macular hole surgery

Since the era when macular hole was considered untreatable, macular hole surgery has come a long way to being one of the most successful surgeries. Internal limiting membrane (ILM) peeling has been an essential step of macular hole surgery since the establishment of the role of ILM in the aetiopathogenesis and progression of macular hole. However, the novel technique was not all virtuous. It had some vices which were not evident immediately. With the advent of spectral domain optical coherence tomography, short- and long-term effects of ILM peeling on macular structures were known; and with microperimetry, its effect on the function of macula could be evaluated. The technique has evolved with time from total peeling to inverted flap to just temporal peeling and temporal flap in an attempt to mitigate its adverse effects and to improve its surgical outcome. ILM abrasion technique and Ocriplasmin may eliminate the need of ILM peeling in selected cases, but they have their own limitations. We here discuss the role of ILM in the pathogenesis of macular hole, the benefits and adverse effects of ILM peeling, and the various modifications of the procedure, to then explore the alternatives.

Proof-of-Concept Analysis of a Deep Learning Model to Conduct Automated Segmentation of OCT Images for Macular Hole Volume

BACKGROUND AND OBJECTIVE

To determine whether an automated artificial intelligence (AI) model could assess macular hole (MH) volume on swept-source optical coherence tomography (OCT) images.

PATIENTS AND METHODS

This was a proof-of-concept consecutive case series. Patients with an idiopathic full-thickness MH undergoing pars plana vitrectomy surgery with 1 year of follow-up were considered for inclusion. MHs were manually graded by a vitreoretinal surgeon from preoperative OCT images to delineate MH volume. This information was used to train a fully three-dimensional convolutional neural network for automatic segmentation. The main outcome was the correlation of manual MH volume to automated volume segmentation.

RESULTS

The correlation between manual and automated MH volume was R² = 0.94 (n = 24). Automated MH volume demonstrated a higher correlation to change in visual acuity from preoperative to the postoperative 1-year time point compared with the minimum linear diameter (volume: R² = 0.53; minimum linear diameter: R² = 0.39).

CONCLUSION

MH automated volume segmentation on OCT imaging demonstrated high correlation to manual MH volume measurements. [Ophthalmic Surg Lasers Imaging Retina. 2022;53(4):208-214.].

AUTOLOGOUS NEUROSENSORY RETINAL TRANSPLANTATION: Bridging the Gap

PURPOSE

To review the autologous retinal transplantation surgical technique, indications, rationale, and current outcomes of data published to date.

METHODS

Review of surgical technique, preoperative and postoperative best-corrected visual acuity, and macular hole (MH) closure rate in studies with at least five eyes.

RESULTS

The weighted average macular hole closure rate is 88%, with a MH closure rate ranging from 66.7% to 100%. The weighted average best-corrected visual acuity improved from mean logarithm of the minimum angle of resolution 1.35 (Snellen equivalent of 20/450) preoperatively to mean logarithm of the minimum angle of resolution 1.02 (Snellen equivalent of 20/210) postoperatively. From the largest autologous retinal transplantation case series, 37% of patients gained 3 or more lines of visual acuity after autologous retinal transplantation for primary or refractory MHs and 74% gained 3 or more lines of visual acuity after autologous retinal transplantation for MH-retinal detachments. Functional improvement including negative Watzke-Allen sign and conversion from positive to negative scotoma was reported in large case series.

CONCLUSION

Autologous retinal transplantation is a promising technique for closure of large and refractory MHs otherwise difficult to repair with conventional techniques. This technique may allow for replacement of neural tissue in the macula through cell rehabilitation and regeneration through presumed ectopic synaptogenesis, retinal progenitor cell differentiation and integration, and/or retinal progenitor cell material transfer to host neurons.

FULL-THICKNESS MACULAR HOLE IN AGE-RELATED MACULAR DEGENERATION PATIENTS WITH TWO DISTINCT ENTITIES: A Multicenter Study

PURPOSE

To describe optical coherence tomography characteristics of full-thickness macular holes (FTMHs) in age-related macular degeneration patients.

METHODS

A multicenter, retrospective, observational case series of patients diagnosed with age-related macular degeneration and FTMHs seen between January 1, 2009, and January 3, 2020. Clinical charts and spectral-domain optical coherence tomography images were reviewed. Optical coherence tomography findings included FTMH-inverted trapezoid or hourglass appearance, central macular thickness (CMT), complete retinal pigment epithelium and complete retinal outer retinal atrophy, and presence of pigment epithelium detachment and epiretinal membrane. The mean outcome was the morphologic and functional characterization of different subtypes of FTMHs.

RESULTS

A total of 86 eyes of 85 consecutive patients, with mean age of 80.31 ± 8.06 and mean best-corrected visual acuity of 1.17 ± 0.58 logarithm of the minimal angle of resolution. Two different subtypes of FTMHs were identified: tractional and degenerative. Fifty (58%) degenerative FTMHs characterized with inverted trapezoid appearance and 36 (42%) tractional FTMHs characterized with hourglass appearance. Degenerative FTMHs presented with 66% of CMT < 240 µm, 14% of CMT > 320, and 70% of complete retinal outer retinal atrophy, in comparison with 41% of CMT < 240 µm, 42.9% of CMT > 320%, and 20% of complete retinal outer retinal atrophy in the tractional FTMH group (P = 0.002, 0.003, <0.001, respectively). The presence of epiretinal membrane and pigment epithelium detachment where significantly higher in tractional FTMHs (P = 0.02, 0.03, respectively).

CONCLUSION

Degenerative and tractional FTMHs may be two distinct clinical entities. Discerning degenerative from tractional FTMHs is possible by using optical coherence tomography features including shape of the FTMHs, CMT, internal-external ratio of FTMHs, and presence of complete retinal outer retinal atrophy, pigment epithelium detachment, and epiretinal membrane.

MACULAR HOLE ASSOCIATED WITH AGE-RELATED MACULAR DEGENERATION: Pathogenesis and Surgical Outcomes

PURPOSE

To ascertain the pathogenesis of macular hole (MH) associated with age-related macular degeneration (AMD) and its surgical outcomes.

METHODS

Patients with full-thickness MH associated with AMD (higher grades than intermediate) were enrolled. The mechanism of MH formation and closure rate after vitrectomy (surgical outcome) were determined using optical coherence tomography imaging.

RESULTS

The mechanism of MH formation (35 eyes) associated with AMD was classified into four types: vitreomacular traction (42.9%), gradual retinal thinning caused by subretinal drusen or pigment epithelial detachment (22.9%), massive subretinal hemorrhage (20.0%), and combined (14.3%). In the 41 eyes that underwent vitrectomy, the logarithm of the minimum angle of resolution best-corrected visual acuity improved from 0.82 (0.10-2.30) preoperative to 0.69 (0.10-2.30) postoperative (P = 0.001). Successful closure of the MH was achieved in 33 eyes (80.5%) after vitrectomy. No significant association was observed between the closure rate of MH after vitrectomy and mechanism of MH formation (P = 0.083).

CONCLUSION

The mechanism of MH formation associated with AMD was classified into four types and was not related to its surgical outcome. Considering visual improvement and surgical outcome after vitrectomy in our study, active surgical treatment can be considered for MH associated with AMD.

iOCT-assisted macular hole surgery: outcomes and utility from the DISCOVER study

BACKGROUND/AIMS

This study aimed to characterise the clinical outcomes and utility of intraoperative optical coherence tomography (iOCT)-assisted macular hole (MH) repair.

METHODS

This was a post hoc analysis of eyes in the D etermination of feasibility of I ntraoperative S pectral domain microscope C ombined/integrated O CT V isualization during E n face R etinal and ophthalmic surgery (DISCOVER) study undergoing surgical MH repair with use of iOCT. Functional and surgical outcome data were collected through 12 months postoperatively. MH closure rate, postoperative visual acuity (VA), percentage of cases in which iOCT provided valuable feedback and altered surgical decision making were measured.

RESULTS

Eighty-four eyes were included in this study. The mean preoperative VA measured 20/114. The mean postoperative VA improved to 20/68 (p<0.001) at month 1, 20/48 (p<0.001) at month 3 and 20/45 (p<0.001) at month 12 or later. In 43 cases (51%), surgeons reported that iOCT provided valuable information (eg, confirming release of vitreomacular traction and identification of occult residual membranes). In 10 cases (12%), iOCT data specifically altered surgical decision making. Postoperative day 1 transtamponade OCT confirmed tissue apposition and apparent hole closure in 74% of eyes (21/26). All five open holes on postoperative day 1 closed following positioning. Single-surgery MH closure was achieved in 97.6% of cases. One persistent MH was successfully closed with a subsequent surgical repair for a final overall closure rate of 98.8%. Due to chronicity and MH size, additional repair was not recommended for the single remaining persistent MH.

CONCLUSION

This study suggests that iOCT may have important utility in MH surgery, including impacting surgical decision making. iOCT-assisted MH surgery resulted in significant improvement in VA and high single-surgery success rate.

Comparative study of 1 DD and 2 DD radius conventional internal limiting membrane peeling in large idiopathic full-thickness macular holes: a randomized controlled trial

OBJECTIVE

To compare the surgical outcomes of 1-disc diameter (DD) and 2-DD conventional internal limiting membrane peeling (C-ILMP) in large full-thickness macular holes (FTMHs).

MATERIALS AND METHODS

A prospective randomized controlled trial. One hundred patients with large idiopathic full-thickness macular hole (FTMH) were randomized into C-ILMP and extended C-ILMP (EC-ILMP) groups. The primary outcome was closure rate at 6 months after surgery. Secondary outcomes were visual acuity (VA), closure type, consequence of ILMP and complications.

RESULTS

The mean symptom duration was 12.19 ± 9.64 months. Mean preoperative VA was 1.25 ± 0.37 logMAR. The average minimum linear diameter was 633.05 ± 129.82 µm and basal linear dimension was 1158.49 ± 249.07 µm. The two groups did not differ in term of demographic data. Closure rate was significantly higher in the EC-ILMP group (76.47% vs. 51.02%, 95% CI 7.24-43.66; p = 0.008). There were also no significant differences in closure type, central foveal thickness, dissociated optic nerve fibre layer detection, or change in fovea-to-disc distance. There were also no significant differences in postoperative VA (p = 0.069) or visual improvement (mean 0.39 ± 0.43 logMAR; p = 0.286). According to subgroup analysis, EC-ILMP resulted in a higher closure rate in patients with chronic FTMH for >6 months, (p = 0.008). Furthermore, EC-ILMP resulted in better anatomical closure and visual result in patients with FTMH with macular hole closure index ≤0.5, p = 0.003 and p = 0.010, respectively.

CONCLUSION

Extended C-ILMP yielded a significantly higher closure rate in large FTMHs, but visual outcome did not differ significantly. According to subgroup analysis, extended C-ILMP was more effective in chronic large FTMH with MHCI ≤ 0.5.

A Human Amniotic Membrane Plug to Treat Persistent Macular Hole

The human amniotic membrane (hAM) has lately demonstrated interesting potential in its retinal applications. Nowadays, the treatment of persistent macular holes is still a challenge. In this paper, we present a case of a hAM plug used to treat a persistent macular hole, with the purpose of highlighting the critical issues of this new surgical procedure. We performed a 23-G pars plana vitrectomy and inserted a hAM plug (diameter of 1.5 mm) under the neuroretinal margins of the hole (diameter of 657 μm). A complete ophthalmic examination with the assessment of best-corrected visual acuity (logMAR units, ETDRS letter score) and optical coherence tomography (OCT) scans were collected at 1, 4, 6, and 10 weeks after surgery. Visual acuity changed from logMAR 1.0 (1) preoperatively to logMAR 1.0 (2), 1.0 (4), 0.9 (9), and 0.9 (10) at 1, 4, 6, and 10 weeks of follow-up, respectively. The 1 week postoperative OCT did not show neuroretinal adhesion over the plug, but the following visits showed reattachment of the margins with partial neuroretinal ingrowth. These findings suggest that the correct adaptation of the size of the hAM plug to the macular hole is essential to allow the anatomical closure of the hole and potential functional results.

Novel Applications of Mesenchymal Stem Cell-derived Exosomes for Myocardial Infarction Therapeutics

Cardiovascular diseases (CVDs) are the leading cause of mortality and morbidity globally, representing approximately a third of all deaths every year. The greater part of these cases is represented by myocardial infarction (MI), or heart attack as it is better known, which occurs when declining blood flow to the heart causes injury to cardiac tissue. Mesenchymal stem cells (MSCs) are multipotent stem cells that represent a promising vector for cell therapies that aim to treat MI due to their potent regenerative effects. However, it remains unclear the extent to which MSC-based therapies are able to induce regeneration in the heart and even less clear the degree to which clinical outcomes could be improved. Exosomes, which are small extracellular vesicles (EVs) known to have implications in intracellular communication, derived from MSCs (MSC-Exos), have recently emerged as a novel cell-free vector that is capable of conferring cardio-protection and regeneration in target cardiac cells. In this review, we assess the current state of research of MSC-Exos in the context of MI. In particular, we place emphasis on the mechanisms of action by which MSC-Exos accomplish their therapeutic effects, along with commentary on the current difficulties faced with exosome research and the ongoing clinical applications of stem-cell derived exosomes in different medical contexts.

Outcomes of 4 surgical adjuvants used for internal limiting membrane peeling in macular hole surgery: a systematic review and network Meta-analysis

AIM

To compare the outcomes of four adjuvants used for internal limiting membrane (ILM) peeling in macular hole surgery, including indocyanine green (ICG), brilliant blue G (BBG), triamcinolone (TA) and trypan blue (TB), through systematic review and random-effects Bayesian network Meta-analysis.

METHODS

PubMed, Cochrane library databases and Web of Science were searched until August 2018 for clinical trials comparing the above four adjuvants. ORs for postoperative best corrected visual acuity (BCVA) improvement and primary macular hole closure rates were compared between the different adjuvants.

RESULTS

Twenty-seven eligible articles were included. For postoperative BCVA improvement, results of BBG-assisted peeling were significantly more favorable than those of ICG (WMD 0.08, 95% credible interval 0.01-0.16) and TA ranked highest. No significant differences were found between any other two groups in postoperative BCVA improvement. For postoperative primary macular hole closure rates, BBG ranked highest. However, no significant differences were shown between any two groups.

CONCLUSION

TA and BBG are the optimum adjuvants for achieving postoperative BCVA improvement macular hole surgery with adjuvant-assisted ILM peeling. Among all adjuvants, the use of BBG is associated with the highest postoperative macular hole closure rate.

Internal limiting membrane peeling with different dyes in the surgery of idiopathic macular hole: a systematic review of literature and network Meta-analysis

AIM

To evaluate the effect of internal limiting membrane (ILM) peeling with indocyanine green (ICG), brilliant blue G (BBG), triamcinolone acetonide (TA), trypan blue (TB), or without dye for the treatment of idiopathic macular hole (IMH).

METHODS

A search was conducted using PubMed, EMBASE, and CENTRAL (Cochrane Central Register of Controlled Trials) for related studies published before October 2018.

RESULTS

A total of 29 studies and 2514 eyes were included in this network Meta-analysis. For IMH closure, the rank from the best to the worse treatment was: BBG, TB, TA, ICG, and no dye. There was a significant difference in postoperative IMH closure rate between BBG and no dye. The rank of the best to the worse treatment to improve visual acuity was: BBG, TB, no dye, TA, and ICG. The improvement rate of visual acuity after using BBG was significantly higher than ICG. The improvement rate of visual acuity was more favorable with TB than ICG, TA, and no dye.

CONCLUSION

BBG can contribute to better anatomical and functional outcomes compared to other dyes for ILM peeling in patients with IMH. The results show that the best treatment of ILM peeling with dyes is BBG.

An Internal Limiting Membrane Plug and Gas Endotamponade for Recurrent or Persistent Macular Hole

Introduction

Recurrent or persistent macular holes (MHs) are rare today due to the tendency to carefully peel the internal limiting membrane. Conversely, their treatment is still a challenge for a vitreoretinal surgeon.

Materials and Methods

This is a retrospective, consecutive, and nonrandomized study of patients affected by recurrent or persistent MHs treated using small-gauge pars plana vitrectomy (25- or 23-gauge) and an autologous ILM plug, at the Eye Clinic of Azienda Ospedaliera Universitaria Careggi (Florence, Italy) between January 2016 and May 2018. We included 8 eyes of 8 patients in the study. Five patients had a recurrent MH while 3 had a persistent MH. The case series includes patients with myopic eyes and with large macular holes (>400 μ). Patients were followed up with ophthalmoscopic examinations and swept-source optical coherence tomography (SS-OCT).

Results

The mean age of the patients was 74 years (±4.81 standard deviation (SD)), 3 patients were men and 5 women. The average axial length was 26.28 mm (±2.84 SD). Four patients had an AL ≧ 26 mm. The mean MH diameter was 436.5 (±49.82 SD). Average preoperative best-corrected visual acuity (BCVA) was 0.81 logMAR (±0.16 SD) and 20/125 Snellen. The ILM plug has been found integrated in the MH in all the follow-ups.

Conclusion

In our study, an ILM autologous macular transplant was used successfully in 5 cases of macular hole recurrence and 3 cases of macular hole persistence. The anatomical success was achieved in all the cases; 4 patients improved their BCVA, and 4 patients maintained it. No macular alterations such as RPE or retinal atrophy/dystrophy were observed after 6 months.

A Double Inverted Flap Surgical Technique for the Treatment of Idiopathic Lamellar Macular Hole Associated with Atypical Epiretinal Membrane

OBJECTIVES

To propose a new technique of a double inverted epiretinal membrane (ERM) and internal limiting membrane (ILM) flap (double flap group) for the treatment of idiopathic lamellar macular hole (LMH) with atypical ERM (AERM) and to compare surgical outcomes to those of the standard technique of ERM and ILM peeling of the fovea including LMH (control group).

METHODS

AERM was tomographically defined as a medium reflective thickened membrane above the retinal fiber layers without retinal traction signs. A series of patients affected by LMH with AERM were recruited. Preoperative parameters were: intraretinal cysts (IRC), intraretinal splitting diameter, residual foveal thickness, and ellipsoid zone integrity. Postoperative findings were: full-thickness macular hole (FTMH) development, and persistence or new appearance of IRC. Best-corrected visual acuity (BCVA) at baseline, first, third, and sixth postoperative month was evaluated.

RESULTS

A total of 48 eyes of 48 patients were included in this study. In the double flap group (30 eyes), a clear improvement of BCVA was noted (p = 0.004), and there were no complications. In the control group (18 eyes), BCVA did not improve and 3 patients developed postoperative FTMH.

CONCLUSIONS

The double inverted flap technique is associated with better functional recovery compared to the standard technique and reduces the risk of postoperative FTMH development.