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Erschienen in: International Ophthalmology 12/2019

Open Access 25.05.2019 | Original Paper

Results of pars plana vitrectomy for primary rhegmatogenous retinal detachment with PVR grades A and B in high-myopic eyes

verfasst von: Ladislav Janco, Katarina Tkacova-Villemova, Anna Matisovska, Maria Mesarosova, Marta Ondrejkova, Alexandra Kollarova, Matus Rehak

Erschienen in: International Ophthalmology | Ausgabe 12/2019

Abstract

Purpose

To evaluate the results of pars plana vitrectomy (PPV) without adjuvant buckling procedures for the primary rhegmatogenous retinal detachment (RRD) with PVR grades A and B in high-myopic eyes.

Methods

A retrospective review included 291 eyes treated for primary RRD from 2008 to 2016. The single surgery success rate (SSSR), the total number of surgeries, outcomes and complications were analysed between group of 67 eyes with high axial myopia (group A) and group of 224 eyes without high myopia (group B).

Results

The mean follow-up was 30.6 ± 22.8 months. The SSSR in group A was 82.1% and in group B was 86.2% (p > 0.05). The final reattachment rate and number of required surgeries were in group A 96.3% (3.1 surgeries) and in group B 96.0% (2.8 surgeries). The initial BCVA improved in group A from 1.58 to 0.58 LogMAR at year 3; and in group B from 1.21 to 0.34 LogMAR. In match-pair analysis of macula-off RRD, no significant difference of the CRT between groups A and B was observed within 3 years of follow-up.

Conclusion

The anatomical success of primary PPV for RRD did not differ between high-myopic and non-high-myopic eyes in PVR grades A and B. However, functional results of high-myopic eyes are worse compared to eyes without high axial myopia.
Hinweise

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Introduction

Myopia is a common ocular condition, and it is not just a simple refractive error; however, it is an eyesight-threatening disease. In the year 2000, the prevalence of high myopia was about 2.7% of the world population (163 million people) and it is predicted that by 2050 there will be about 938 million people suffering from high myopia (9.8% of the world population) [1]. High myopia may result in irreversible visual loss due to the retinal detachment, choroidal neovascularization, macular atrophy, glaucoma, cataract and other complications [14].
Although the anatomical success rate of the vitreoretinal surgeries, especially pars plana vitrectomy (PPV), has improved over the past years, the rhegmatogenous retinal detachment (RRD) surgery of high-myopic eyes is still challenging for the vitreoretinal surgeons. Shifting of the primary surgical approach for RD towards PPV has been also observed [5]. The surgery of high-myopic eyes differs from non-high-myopic eyes due to the following facts: the very long axial length, the fragile and thin sclera, the choroidal hemodynamic changes with an increased risk of the subretinal and choroid haemorrhage, the choroidal detachment, the anomalous posterior vitreous detachment with the high prevalence of vitreoschisis, the pathologic vitreoretinal attachments with higher retinal break occurrence, as well as the irregularity of the posterior border of the vitreous base. In comparison with the general population, the anatomical single surgery success rate (SSSR) of retinal detachment surgery in high-myopic eyes was accepted to be lower [6].
The purpose of our study was to compare the long-term anatomical and functional results of 67 eyes with high myopia with 224 non-high-myopic eyes treated with PPV without adjuvant buckling procedures for the primary RRD in our clinic.

Materials and methods

We retrospectively reviewed the charts of 336 consecutive eyes with primary RRD which underwent surgery at the 2nd Eye Clinic of Slovak Medical University, F. D. Roosevelt Hospital, Banská Bystrica, Slovakia, from January 2008 to July 2016.
Eyes were included into the analysis if the following criteria were met: (1) primary RRD with PVR A and B with pre- or intraoperatively detected retinal break was treated with 20 or 23 gauge PPV without adjuvant buckling surgery; (2) duration of RRD less than 2 months; (3) follow-up time ≥ 6 months after primary surgery.
Exclusion criteria for the evaluation were: (1) presence of PVR grade C; (2) any previous intraocular surgical intervention except cataract surgery ≥ 3 months prior to RRD; (3) previous unsuccessful buckling surgery for RRD; (4) terminal glaucoma eye damage; (5) heredodegenerative retinal diseases and/or exsudative age-related macular degeneration (AMD).
The retrospective data analysis was approved by the Institutional Review Board of F. D. Roosevelt Hospital in Banská Bystrica, and it was adherent to the Declaration of Helsinki. All patients gave their informed consent prior to their treatment.
According to the axial length (AXL) measured by ultrasound biometry (Compact Touch, Quantel medical, France), patients were divided into two subgroups. Group A (high-myopic eyes) included patients with AXL ≥ 26.0 mm. Patients with AXL < 26.0 mm were included in group B (non-high-myopic eyes).
At baseline and during the follow-up time (months 3, 6, 9, 12 and years 2, 3, 5), the following ophthalmologic examinations were performed: BCVA, slit-lamp biomicroscopy, fundus examination and postoperative measurements of the central retina thickness CRT using Spectralis OCT (Heidelberg Engineering, Heidelberg, Germany). BCVA values measured in decimal visual acuity were converted into LogMAR using the Freiburger visual acuity conversion chart [7].
The single surgery success rate (SSSR), the total number of required surgeries, visual and morphological outcomes and complications were analysed between both subgroups of patients. In silicone oil-filled eyes, silicone oil removal was performed in 3–6 months after primary surgery. SSSR was defined as reattached retina at least 6 months after silicone oil removal.

Retinal detachment repair

In all eyes, total vitrectomy was performed using the 20 or 23 gauge (Constellation vision system, Alcon1 Laboratories, Inc.) under vitreous visualization with triamcinolone acetonide (40 mg/mL diluted with balanced salt solution) and then was followed by internal subretinal fluid drainage through fluid–air exchange and laser photocoagulation or cryoretinopexy applied around retinal tears. Fluid–gas exchange (air, SF6, C3F8) or fluid–silicon oil exchange was performed in all eyes. The use of silicone oil as primary vitreous tamponade we always consider very carefully. We have considered the general health status, positioning ability, the need to travel and the lens status (e.g. aphakic eyes).
In eyes of RRD with epiretinal membrane, the epiretinal membrane removal and primary peeling of internal limiting membrane after staining with Brilliant Blue G (0.025%, ILM-BLUE®; DORC) were performed. If there was clinically significant lens opacity preoperatively, phacoemulsification and intraocular lens implantation were performed.

Statistical analysis

The qualitative variables are demonstrated using the absolute and relative multiplicity. The difference referring to a qualitative variable was tested by Fisher’s exact test (at the contingency table 2 × 2) or Chi-Quadrate Test of Independence (the contingency table of bigger scale than 2 × 2). The testing using the Chi-Quadrate Test of Independence was performed when the following condition was met: the share of anticipated multiplicities with the value less than 5 is less than 20%. In other cases, the testing was not executed. T test or the scatter analysis (ANOVA) tests the difference referring to a qualitative variable according to the number of the compared groups. All used tests are reciprocal. The value α = 0.05 was chosen to be the significance level.

Results

From a total of 336 screened eyes 291 eyes of 281 patients (137 men (48.8%) and 144 women (51.2%)) were included into the analysis. Sixty-seven eyes (23%) met the criteria of high myopia and were included in the subgroup A; subgroup B included in total 224 (77%) non-high-myopic eyes. The baseline parameters are presented in Table 1.
Table 1
Baseline characteristics of patients in both subgroups
Parameter
All Patients (N = 291)
Group A
High-myopic eyes (N = 67)
Group B
Non-high-myopic eyes (N = 224)
p value
Age (mean ± SD) and range
60.2 ± 12.5
(18–86) years
53.8 ± 14.7
(19–83) years
62.1 ± 11.1
(18–86) years
< 0.001
Women (%)
149 (51.2%)
40 (59.7%)
109 (48.7%)
0.113
Follow-up time (mean ± SD) and range
30.6 ± 22.8
(6–96) months
33.0 ± 23.6
(6–84) months
29.9 ± 22.6
(6–96) months
0.333
Macula status
   
0.008
Macula on RD
65 (22.3%)
7 (10.4%)
58 (25.9%)
 
Macula-off RD
226 (77.7%)
60 (89.6%)
166 (74.1%)
 
Lens status
   
0.007
Phakic
184 (63.2%)
40 (59.7%)
144 (64.3%)
 
Pseudophakic
98 (33.7%)
21 (31.3%)
77 (34.4%)
 
Aphakic
9 (3.1%)
6 (9.0%)
3 (1.3%)
 
Duration of RD prior to surgery
    
In days < 7 days
122 (41.9%)
25 (37.3%)
97 (43.3%)
0.383
≥ 7 days
169 (58.1%)
42 (62.7%)
127 (56.7%)
 
Type of surgery
   
0.167
20 G
130 (44.7%)
25 (37.3%)
105 (46.9%)
 
23 G
161 (55.3%)
42 (62.7%)
119 (53.1%)
 
Primary tamponade
   
0.135
Air
4 (1.4%)
4 (1.8%)
 
SF6
72 (24.7%)
11 (16.4%)
61 (27.2%)
 
C3F8
170 (58.4%)
42 (62.7%)
128 (57.1%)
 
SO
45 (15.5%)
14 (20.9%)
31 (13.8%)
 
Peripheral retinal degenerations
47 (16.2%)
8 (11.9%)
39 (17.4%)
0.286
Number of retinal breaks and holes
   
0.869
1
137 (47.1%)
33 (49.3%)
104 (46.4%)
 
2
73 (25.1%)
17 (25.4%)
56 (25.0%)
 
3 and more
81 (27.8%)
17 (25.4%)
64 (28.6%)
 
Localization of retinal breaks and holes
   
0.933
Superior
174 (59.8%)
39 (58.2%)
135 (60.3%)
 
Inferior
48 (16.5%)
11 (16.4%)
37 (16.5%)
 
Superior and inferior
69 (23.7%)
17 (25.4%)
52 (23.2%)
 
Number of quadrants of RRD
   
0.089
1
25 (8.6%)
3 (4.5%)
22 (9.8%)
 
2
134 (46.0%)
25 (37.3%)
109 (48.7%)
 
3
78 (26.8%)
22 (32.8%)
56 (25.0%)
 
4
54 (18.6%)
17 (25.4%)
37 (16.5%)
 
Mean age of all patients at the baseline (at time of surgery) was 60.2 ± 12.5 years (range 18–86 years). Most of the patients underwent the primary surgery of RD between 50 and 69 years of age (65.3%), 13.7% of patients were younger than 50, and 21.0% of patients were older than 70. The mean age of women was 61.8 ± 11.8 years, and in men 58.5 ± 13.0 years. The age at baseline differs significantly between groups A and B. As displayed in Table 1, patients with high myopia experienced their first RRD about 10 years earlier than patients without myopia (53.8 ± 14.7 vs. 62.1 ± 11.1 years in group A vs group B, respectively). The mean follow-up time was 30.6 ± 22.8 months (range 6–96 months). The data from follow-up visits at years 1, 2, 3 and 4 were available from 244 (83.8%), 162 (55.7%), 102 (35.1%) and 50 (17.2%) eyes, respectively. The follow-up of 7 years achieved 12 eyes (4.1%) only. Due to the small number of high-myopic eyes (group A) with follow-up at years 5 and 7 (16 and 3 eyes), no statistical analysis for these time points was possible. We have recorded myopia in 144 eyes (49.5%), out of which the high myopia in 67 eyes (23%) was found. The duration of RD at day of first surgery was < 7 days in 25 eyes (37.3%) in group A and 97 eyes (43.3%) in group B.  %). In group A, the presence of macula-off RRD at baseline was significantly higher than in group B [60 of 67 eyes (89.6%) versus 166 of 224 (74.1%) eyes; p = 0.008]. The 20-gauge pars plana vitrectomy was performed in 130 eyes (44.7%), and 23-gauge PPV was preformed in 161 eyes (55.3%). Primary tamponade with air was used in 4 eyes (1.4%), SF6 in 72 eyes (24.7%), C3F8 in 170 eyes (58.4%) and silicone oil in 45 eyes (15.5%). There were no significant differences between groups A and B in the presence of the peripheral retinal degenerations, number and localization of the retinal breaks and holes and number of RRD quadrants (Table 1). The phacoemulsification for the cataract progression after PPV was performed in 35 of 184 primary phakic eyes (19.0%) within 6 months after PPV, in another 86 eyes (46.7%) within 1 year and in 35 eyes (19.0%) within 3 years. In total, 28 eyes (15.2%) had clear lens until the end of follow-up.

Anatomical results

The anatomical SSSR (displayed in Fig. 1) did not differ between both evaluated subgroups and was 82.1%, and 86.2% in eyes with high myopia and non-high-myopic eyes, respectively (p > 0.05). Within 3 years after the initial surgery in total, 3.1 surgeries were required in group A and 2.8 in group B to achieve the anatomic success rates of 96.3% and 96.0%, respectively (see Fig. 1).
The incidence of development of postoperative epiretinal membrane up to the last follow-up visit did not significantly differ (p = 0.541) between the group A in 7 eyes (10.4%) and group B in 32 eyes (14.3%).

Vitreous tamponade

The used primary vitreous tamponade is shown in Fig. 2. The most frequently used tamponade in both evaluated groups of patients was the expansive gas (SF6 or C3F8). The use of silicon oil was higher in eyes with high myopia (group A) but did not differ significantly from group B [14 of 63 (21%) vs. 31 of 224 (14%) eyes; p = 0.178].

Functional results

The baseline BCVA was significantly lower in eyes with high myopia (1.58 LogMAR) when compared with 1.21 LogMAR in non-high-myopic eyes (p < 0.001). Figure 3 shows the development of BCVA in both subgroups during the follow-up of 3 years. The differences between group A and group B at month 6; years 1, 2 and 3 were statistically significant (p < 0.001; p < 0.001, p = 0.011; and p = 0.025, respectively).
At baseline, 10.4% high-myopic eyes and 20.5% non-high-myopic eyes presented the BCVA ≤ 0.3 LogMAR (p = 0.071). The prevalence of BCVA ≤ 0.3 LogMAR remained significantly higher in high-myopic eyes during the entire analysed follow-up of 3 years (see Fig. 4).

Central retinal thickness

The mean central retinal thickness (CRT) at month 6 after initial RD surgery was in group A 233 ± 42 µm and in group B 264 ± 75 µm. No significant changes in CRT were observed within each single subgroup during the follow-up period of 3 years (see Fig. 2). The CRT values at each follow-up time point are presented in Fig. 5. At each evaluated visit, significantly lower CRT value was documented in high-myopic eyes when compared with non-high-myopic eyes.
As the prevalence of macula-off RRD differed significantly between eyes with (group A) and without (group B) high myopia and even non-significant, but obvious, difference in the use of silicon oil tamponade was presented, we performed an additional matched-pair analysis of paired eyes from both subgroups to evaluate the changes in BCVA and CRT. Reflecting the fact that in group A most eyes presented with macula-off RRD, we used for this subanalysis the following eyes: (1) macula-off RRD, (2) absence of Aphakia, (3) PPV without primary ILM-peeling (3) primary tamponade with gas (SF6 or C3F8) and (4) the absence or other pathologies affecting the BCVA and CRT (e.g. amblyopia, macular hole, etc.)
The matched pairs were built from all in the database-identified eligible eyes. For each eye with high myopia in group A (in total 67 patients), a matched patient from group B (from total 224 patients) was identified by matching for gender, age (with difference ≤ 5 years) and BCVA (with difference ≤ 0.1 LogMAR). Cases for whom a matched pair could not be appropriately identified were dropped from the subsequent analysis. Whenever multiple matches were possible, the non-myopic eyes with the closest BCVA value to the myopic eye were selected. Data were manually cross-checked after export to SPSS, with random-sampling verification of the matching process.
In total, 20 matched pairs could be created. The changes in BCVA and CRT during the follow-up time over 3 years are shown in Figs. 6 and 7, respectively. Even the non-high-myopic eyes presented better BCVA after the primary surgery, and the CRT in high-myopic eyes tends to decrease stronger than in group B; in both evaluated functional parameters, no significant differences between high-myopic and non-high-myopic eyes could be detected during the entire follow-up time.

Discussion

In our study, the SSSR in eyes with high myopia was 82.1% and the final reattachment rate after 3 years was 96.3%. The results did not significantly differ from anatomical results in non-high-myopic eyes (SSSR 86.2%; final reattachment rate 96.0%, p > 0.05). Our results are in line with other published studies. Kwok et al. [8] reported the primary anatomical success rate in the amount of 86.1% in the scleral buckle (SB) group and 75% in the PPV group concerning the high-myopic eyes. The final reattachment rate was 97.2% for the SB group and 100% for the PPV group. Cheng et al. [9] reported the anatomical success rate in the amount of 86.5% after the primary vitreoretinal surgery and the final anatomical success rate was 100%. Bernheim et al. [10] showed in their prospective study the final reattachment rate referring to the high myopia in the amount of 96%. The increased use of PPV, already described in association with the other diseases, reduces the operating time, allows better visualization of breaks, increases the single retinal reattachment rate [8, 9] and reduces the refractive changes compared to the scleral buckle surgery [1114]. Due to the anatomical specifics, the RDD surgery of high-myopic eyes is challenging and the SSSR was reported to be lower than that in non-myopic eyes [6]. The need for adjuvant buckle (encircling band) combined with the primary PPV in high-myopic eyes with RDD is still discussed and not finally clarified yet. The results of VIPER Study are reporting success rates of the primary PPV versus PPV combined with encircling band (EB) in pseudophakic eyes [15]. No significant difference was observed among groups treated with 20G PPV with adjuvant EB (79.0%) when compared with eyes treated with 20G without EB (78.7%) and 23/25G without EB (87.7%) [15].
Ripandelli et al. [16] described the benefit form additional buckle with inferior indentation in recurrent retinal detachment in highly myopic eyes. Based on the results of our analysis, there is no need for primary adjuvant buckle (EB) in all myopic eyes.
The postoperative functional outcomes in high-myopic eyes are less satisfactory than the anatomical results. In our study the high-myopic eyes reached 3-years after primary surgery the high-myopic eyes reached the BCVA of 0.58 LogMAR compared to 0.34 LogMAR in non-high-myopic eyes. At this time, point BCVA of ≤ 0.3 was achieved in 40.7% of high-myopic eyes.
Non-high-myopic eyes presented significantly more favourable visual prognosis. This observation correlates with significantly worse baseline (before RRD surgery) BCVA in high-myopic eyes. Further, the worse functional results might be caused also by the observed CRT decrease in this subgroup. It is also important to consider that 60 of 67 myopic eyes (89.6%) presented the macula-off detachment. In group B (non-high-myopic eyes), the macula-off detachment was preoperatively presented in 166 of 224 eyes (74.1%) only. The BCVA of ≤ 0.3 LogMAR reached 65.3% of patients in this subgroup. Kwok et al. [8] reported that 62.5% of the eyes undergoing the primary pars plana vitrectomy reached the visual acuity of 20/60 or better. Cheng et al. [9] demonstrated that 26.3% of eyes achieved the postoperative vision 20/50 or better in the pars plana group and 68.5% of the eyes in the scleral buckling group. The obvious difference in functional result between both groups could be explained by the fact that the vitrectomy was used only in more complicated RD cases. Bernheim et al. [10] reported that 54% of the eyes after the first surgery and 44% of the eyes after the multiple surgeries had the visual acuity 20/40 or better. The good visual prognosis was negatively associated with the presence and duration of macular detachment and the axial length. Rodriguez et al. [17] in his study reported that 65% of the eyes with high myopia had the final visual acuity 20/40 or better after the 6-month follow-up concerning the scleral buckling surgery. Visual recovery after RD surgery is still unclear, and it does not depend on the entity of the RD. Vignolo et al. [18] demonstrate that in biofeedback group, there was a significant recovery in visual performances that still remains evident after 3 months from the baseline.
Further, our study confirmed the knowledge that CRT in high-myopic eyes is significantly lower than that in non-high-myopic eyes. However, after PPV for RD no significant differences in development of CRT were observed between both groups. The analysis of all high-myopic versus non-high-myopic eyes showed the trend to decrease of CRT in high-myopic eyes. However, in the matched-paired analysis, in which the eyes with macula-off RDD myopic eyes presented with lower CRT, no significant decrease during the follow-up of 3 years after the primary surgery was observed when compared with non-high-myopic eyes.
Our study is a retrospective analysis, underlying all limitations of a non-randomized trial. The largest limitation is the small sample size. Furthermore, it could not be excluded that some patients who underwent the primary surgery in our clinic and had further need for repetitive surgeries did not missed their follow-up visit and underwent their surgery elsewhere. Further limitation of the study is the exclusion of eyes with PVR grade C.
In conclusion, the results of our study showed that the anatomical success rate of primary PPV without adjuvant buckle in high-myopic eyes is comparable with the results in eyes without high myopia. However, in the subgroup with high myopia we obtained a significant decrease in the BCVA and CRT on OCT. Similar anatomical results of the pars plana vitrectomy without adjuvant procedures were referred by other authors in eyes without myopia [1922].
Significant advances of the surgical treatment of RRD have been made, and a variety of techniques are now available, with new instruments and modifications constantly being reported. However, further improvements are expected in the future [23, 24].

Compliance with ethical standards

Conflict of interest

Author Ladislav Janco declares that he has no conflict of interest. Author Katarina Tkacova-Villemova declares that she has no conflict of interest. Author Maria Mesarosova declares that she has no conflict of interest. Author Marta Ondrejkova declares that she has no conflict of interest. Author Alexandra Kollarova declares that she has no conflict of interest. Author Matus Rehak declares that he has no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
Informed consent was obtained from all individual participants included in the study.
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://​creativecommons.​org/​licenses/​by/​4.​0/​), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Metadaten
Titel
Results of pars plana vitrectomy for primary rhegmatogenous retinal detachment with PVR grades A and B in high-myopic eyes
verfasst von
Ladislav Janco
Katarina Tkacova-Villemova
Anna Matisovska
Maria Mesarosova
Marta Ondrejkova
Alexandra Kollarova
Matus Rehak
Publikationsdatum
25.05.2019
Verlag
Springer Netherlands
Erschienen in
International Ophthalmology / Ausgabe 12/2019
Print ISSN: 0165-5701
Elektronische ISSN: 1573-2630
DOI
https://doi.org/10.1007/s10792-019-01126-4

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