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Surgical management of retinal detachment and macular holes secondary to ocular toxoplasmosis: a systematic review and meta-analysis

International Journal of Retina and Vitreous volume 10, Article number: 23 (2024) Cite this article

Abstract

Background

Toxoplasma gondii causes ocular toxoplasmosis (OT), involving inflammation, scarring, and retinal complications. The OT complications were retinal detachment (RD), and retinal breakage (RB). Surgical interventions like scleral buckling (SB) and vitrectomy are common. Limited understanding exists of the safety and efficacy of surgical management of RD/RB secondary to OT. Another complication is toxoplasmosis-related macular holes (tMH), with sparse evidence on surgical outcomes. This meta-analysis aims to clarify clinical characteristics, and surgical results, and enhance understanding of RD, RB, and MH secondary to OT.

Methods

PubMed, Cochrane, Embase and Web of Science database were queried for retrospective studies, case series and case reports that provided information on RD, RB and MH associated with OT and reported the outcomes of: (1) Retinal reattachment of RD/RB and tMH closure; (2) Best-corrected visual acuity (BCVA) improvement; and (3) Complications. Heterogeneity was examined with I2 statistics. A random-effects model was used for outcomes with high heterogeneity. Statistical analysis was performed using the software R (version 4.2.3, R Foundation for Statistical Computing, Vienna, Austria).

Results

Fourteen final studies, comprising a total of 96 patients were analyzed, 81 with RD or RB and 15 with tMH. Overall, surgical management was associated with several advantages: a high rate of retinal reattachment of RD/RB of 97% (95% Confidence Interval [CI] 92–100%; I2 = 0%), retinal reattachment of just RD of 96% (95% CI 89–100%; I2 = 30%) and tMH closure 97% (95% CI 87–100; I2 = 12%). There were significant differences in BCVA after surgeries in studies of RD/RB (MD 0.60; 95% CI 0.35–0.65; I2 = 20%) and MH (MD 0.67; 95% CI 0.50–0.84; I2 = 0%). The overall complication rate associated with surgical procedures in RD/RB secondary to OT was confirmed to be 25%.

Conclusions

The systematic review and meta-analysis showed that the treatment approaches currently in use are effective, with a remarkable rate of retinal reattachment of RD/RB, tMH closure, and substantial improvements in visual acuity. More randomized, long-term studies on disease and surgical factors can provide valuable insights into their impact on anatomical and visual outcomes.

Introduction

Toxoplasma gondii is frequently characterized as one of the most prolific parasites; it hosts a wide range of organisms that encompasses humans, as well as domesticated and wild warm-blooded animals [1]. The clinical sequelae ensuing from an infection with T. gondii are medically designated toxoplasmosis. Specifically, when ocular structures are involved, the condition is labeled ocular toxoplasmosis (OT). The modes of infection encompass congenital transmission as well as postnatal acquisition, with empirical research substantiating a predominantly postnatal origin [2]. During the acute phase of infection, the tachyzoites of the parasite infiltrate ocular tissues, precipitating an inflammatory cascade that manifests as inflammation, necrosis, fibrotic scarring, retinal and choroidal atrophy (termed retinochoroiditis), and inflammation affecting the optic nerve head (referred to as papillitis) and the uvea (designated uveitis) [3]. Chronic ocular toxoplasmosis is typified by the presence of parasitic cysts within the retina, ganglion cells, and Muller cells [4].

Some individuals with OT may exhibit retinal lesions [5, 6], including retinal detachment (RD), which refers to the detachment of the anterior sensory retinal layers from the retinal pigment epithelium (RPE), leading to the accumulation of subretinal fluid within the interstitial space separating the retina from the RPE [7]. Notably, in patients marked by substantial scarring and inflammation involving the peripheral retinal regions, the risk of retinal detachment is significantly heightened. The presence of scarring and inflammation resulting from ocular toxoplasmosis can exert tractional forces upon the retina, thus accentuating the likelihood of RD and retinal breakage (RB) [8]. The management of RD typically involves surgical techniques such as scleral buckling (SB), pars plana vitrectomy (PPV), and pneumatic retinopexy (PR) [9, 10]. However, the prevalence and visual consequences of RD in patients with OT have not been fully characterized. There is a significant gap in our understanding of the anatomical and functional outcomes of patients with toxoplasmic RD. Moreover, factors related to the disease and its treatment that influence the incidence of RD and poor visual outcomes are not well understood in the literature.

Moreover, another potential retinal complication to consider is the development of a toxoplasmosis-related macular hole (tMH). While relatively rare, there is a belief that inflammatory conditions may instigate the migration and proliferation of the RPE within the retina. This process can result in the shrinkage of the retina and the generation of tangential traction on the macula, potentially contributing to the development of a tMH. However, it is crucial to note that there is a scarcity of evidence on this aspect, with only a limited number of studies specifically investigating surgical outcomes related to tMH.

To enhance our understanding of the pathogenesis and management of toxoplasmosis-related retinal lesions, this meta-analysis aimed to comprehensively assess the clinical characteristics of individuals with RD, RB and MH associated with ocular toxoplasmosis while also examining surgical treatment outcomes for these conditions.

Methods

Protocol, search strategy and data extraction

We systematically searched the PubMed, Cochrane Library, Embase, and Web of Science databases. This study was registered in the International Prospective Register of Systematic Reviews (PROSPERO; CRD42023482369). Our search strategy was carefully crafted to conduct a thorough investigation of the topic utilizing a comprehensive combination of relevant keywords. The specific keywords employed in our search included: "Toxoplasmosis", "Toxoplasmic", "Ocular Toxoplasmoses", "Ocular Toxoplasmosis", “Detachment, Retinal", "Detachments, Retinal", "Retinal Detachments", "Retinal Pigment Epithelial Detachment", "Retinal Perforation", "Holes, Retinal", "Macular Hole", "Macular Holes", "Retinal Break", "Retinal Breaks", "Retinal Dialyses", "Retinal Hole", "Retinal Holes", "Retinal Perforation", "Retinal Tear", "Retinal Tears", "Retinal Detachment". This meticulous approach ensured that we obtained the most pertinent and reliable information, empowering us to present a well-founded and in-depth analysis of the subject matter. Two authors (L.C. and G.M.) independently extracted the data following predefined search criteria.

Eligibility criteria

The inclusion criteria of this study were as follows: (1) Participants: individuals (> 18 years) with RD and/or RB associated with ocular toxoplasmosis and individuals (> 18 years) with tMH (2) Intervention: surgical or clinical therapy; (3) At least one or more clinical outcomes: retinal reattachment, tMH closure, recurrence of RD or RB, development of RD or RB less than 2 years after Retinochoroiditis, best-corrected visual acuity (BCVA) improvement and complications; (4) Type of study: retrospective observational studies, case series, and case reports. The exclusion criteria were as follows: (1) animal studies; (2) abstracts, editorials, letters, and conference proceedings without efficient data; (3) research papers that did not provide clear data. This exclusion was implemented to ensure that only high-quality studies were included in the analysis.

Statistical analysis

This systematic review and meta-analysis were performed per the Cochrane Collaboration and the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) statement guidelines [11]. Relative risk (RR) with 95% confidence intervals (CIs) were used to compare outcome treatment effects. Continuous outcomes were compared with mean difference (MD). I2 statistics were used to assess for heterogeneity; When P < 0.1 for the Q test and I2 > 50%, which was considered as substantial heterogeneity, the random-effect model was used; otherwise, the fixed-effect model was performed. Statistical analysis was performed using the software R (version 4.2.3, R Foundation for Statistical Computing, Vienna, Austria).

Individual patient data meta-analysis

In our comprehensive systematic review and meta-analysis, we categorized studies based on the level of granularity in the patient data they supplied. The individual patient data meta-analysis (IPDMA) group comprised case reports studies that offered individual-level patient data. For our analytical purposes, the IPDMA studies were amalgamated into two distinct groups. The first group, termed IPDMA-RD, encompassed case reports featuring patients with RD and/or RB. The second group, designated IPDMA-MH, included case reports involving patients with tMH.

Results

Study selection

We found 610 articles, 152 in PubMed, 351 in Embase, 105 in the Web of Science, and 2 in the Cochrane Library. A total of 390 nonduplicate citations were screened, and after a thorough review, 23 articles were selected after the abstracts were read for a full-text review. Next, 9 articles were excluded after full-text screening and data extraction. Finally, 14 studies (8 retrospective studies [12,13,14,15,16,17,18,19] + 6 case reports [20,21,22,23,24,25]) were included in the final analysis. This search is described in Fig. 1.

Fig. 1
figure 1

PRISMA flow diagram of study screening and selection

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In this analysis, a total of 96 patients were analyzed, 81 with RD or RB and 15 with MH. The baseline characteristics of the RD or RB studies are shown in Table 1, while Table 2 displays the tMH studies.

Table 1 Baseline characteristics of the included patients with RD or RB
Full size table
Table 2 Baseline characteristics of the included patients with tMH
Full size table

Retinal reattachment

The rate of retinal reattachment of RDs and RBs was reported in eight studies that included 81 eyes. We observed no methodological heterogeneity among the studies (P = 0.53, I2 = 0%). The pooled retinal reattachment rate was 97% (95% CI, 92 to 100%) in a common-effect model (Fig. 2A). Furthermore, the analysis of retinal reattachment in cases of RD were mildly heterogeneous (P = 0.24, I2 = 24%). The pooled retinal reattachment of RD was 96% (95 CI: 90 to 100%) with a common-effect model (Fig. 2B).

Fig. 2
figure 2

A Retinal reattachment of the retinal detachment and retinal breakage. B Retinal reattachment of retinal detachment forest plot. C Toxoplasmosis-related macular hole closure

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Toxoplasmosis-related macular hole closure

The analysis of tMH closure revealed a rate of 98% (95% CI 87–100%), with a low level of heterogeneity (I2 = 12%; common-effect model), as shown in Fig. 2C.

Development of retinal detachment or retinal breaks less than 1 year after retinochoroiditis

The rate of development of RD or RB in less than 1 year after retinochoroiditis was reported in two studies that included 26 eyes. We observed no methodological heterogeneity among the studies (P = 0.34, I2 = 0%). These pooled analysis rate was 62% (95% CI 44–81%) in a common-effect model (Fig. 3).

Fig. 3
figure 3

Development of retinal detachment or retinal breaks less than 1 year after retinochoroiditis forest plot

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Recurrence of retinal detachment

The analysis of recurrence of RD revealed a rate of 14% (95% CI 5–23%), with a mild level of heterogeneity (I2 = 42%; common-effect model), as shown in Fig. 4.

Fig. 4
figure 4

Recurrence of retinal detachment forest plot

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Best-corrected visual acuity

The mean BCVA before and after RD or RB surgeries was documented in five studies, encompassing a total of 53 eyes. We observed a low level of heterogeneity among the studies (P = 0.29, I2 = 20%). Compared to the preoperative baseline, BCVA significantly improved after the surgical management (MD = 0.60; 95% CI 0.35–0.85; Fig. 5A).

Fig. 5
figure 5

A Best-corrected visual acuity mean difference after RD and RB surgical management forest plot. B Best-corrected visual acuity mean difference after MH surgical management forest plot

Full size image

The mean BCVA before and after MH surgeries encompassed a total of 15 eyes. We observed a low level of heterogeneity among the studies (P = 0.87, I2 = 0%). Compared to the preoperative baseline, BCVA significantly improved after surgical management (MD = 0.67; 95% CI 0.50–0.84; Fig. 5B).

Complications

The rate of complications was reported in four studies that included 51 eyes with RD or RB. We observed no methodological heterogeneity among the studies (P = 0.99, I2 = 0%). This pooled analysis rate was 25% (95% CI 13–37%) in a common-effect model (Fig. 6). The complications reported in RD or RB studies were glaucoma or elevated intraocular pressure, bulbar atrophy, hypotony, cataract, dislocation of lens and final enucleation. In the investigations of surgical interventions for MHs, the sole reported complication was the occurrence of a single cataract.

Fig. 6
figure 6

Complications associated with surgical management of retinal detachment secondary to ocular toxoplasmosis forest plot

Full size image

Discussion

To our knowledge, this meta-analysis represents the inaugural examination of surgical interventions for RD/RB and MH secondary to OT in the literature. Within our meta-analysis, we delineate the study selection and characteristics, encompassing 14 studies that were incorporated into the review, with a collective analysis of 97 eyes. The findings indicate a notable success rate in achieving retinal reattachment of RD/RB and closure of MHs through surgical management. Furthermore, BCVA demonstrated improvement in both RD/RB and MH analyses post-surgery. Importantly, the overall rates of general complications were significantly reduced.

OT is characterized by self-limiting necrotizing retinochoroiditis, vitritis, and inflammation in the anterior segment. Active OT is characterized by focal necrotizing retinochoroiditis that is usually unilateral and may be congenital or acquired [13, 26,27,28,29]. RD and RB, a leading cause of blindness in ocular toxoplasmosis, results from posterior vitreous detachment due to intraocular inflammation, requiring surgical treatment [14, 30].

Earlier investigations have identified various risk factors associated with RD and RB. These factors encompass age, myopia, severe inflammation, positive family history, as well as a history of trauma, cataract surgery, and diabetes [14, 15, 31]. In this meta-analysis, the risk factors identified were myopia and proliferative vitreoretinopathy (Table 1).

Furthermore, as shown in Table 2, the clinical treatment for OT typically involves antimicrobial medications, with or without the addition of corticosteroids in oral, topical, or intravitreal administration. Various drugs have been suggested, including pyrimethamine, sulfadiazine, spiramycin, clindamycin, and trimethoprim-sulfamethoxazole. The use of corticosteroids in ocular toxoplasmosis remains a topic of debate; these medications are primarily employed to mitigate severe inflammatory reactions. However, it is important to note that corticosteroids in OT may potentially impact the development of vitreoretinal traction and preretinal membranes [18, 32]. This influence may contribute to the development of RD or RB.

The analysis revealed that retinal reattachment was successful in 97% of the patients with RD or RB and 96% of the patients with just RD, indicating the effectiveness of the treatments used to address RD and RB associated with OT. Simple operations would demonstrate better outcomes in cases of RD and RB, while combined procedures that were associated with higher risk of poor results could be indicated for more complex cases of RD with risk factors [12]. Prior studies have explored diverse surgical approaches. In the analysis, PPV and/or SB in conjunction with silicon oil infusion or gas infusion were the predominant techniques (Table 1).

Within 1 year of experiencing retinochoroiditis, according to the analysis, approximately 62% of patients develop retinal detachment or breaks. This happens because of T. gondii's ability to access the human retina through various routes, including leukocyte taxis, transmigrating tachyzoites, and infecting endothelial cells [13, 33]. Once within the retina, these tachyzoites can traverse retinal layers and access various retinal host cells [27, 33].

RD is not a common occurrence in OTs, as evidenced by a study conducted in the Netherlands that involved 154 patients and reported a frequency of approximately 6% [28]. However, a meta-analysis has shown that there is a recurrence rate of 14% for retinal detachment after reattachment surgery. Recurrent retinochoroiditis is prevalent in OT, as evidenced by a substantial retrospective case series indicating recurrences in 79% of patients monitored for an average of > 5 years [28, 34]. This underscores a potential association with recurrent RD. These findings emphasize the importance of long-term monitoring and further research to develop interventions that can effectively minimize the likelihood of recurrent detachment in these patients.

The literature suggests that ocular toxoplasmosis often affects the macula, leading to a significant decline in visual acuity. However, the present study showed that surgical treatment can substantially improve BCVA, with an average increase of 0.60 LogMAR. The factors such as patient-specific risk profiles and the surgeon's expertise with different techniques play crucial roles in determining the optimal improvement in BCVA. These considerations guide the selection of surgical treatments in such cases. Evidence supporting this comes from a prior study, where patients retaining their visual potential were found to have attached RBs. This correlation could be explained by the detection of these RBs during ophthalmologic examinations conducted as part of active OT attacks, leading to early intervention and treatment [14, 29].

The overall complication rate of ocular toxoplasmosis has been reported to be 25%. The primary reported complication is postoperative glaucoma or elevated IOP. This observation may be associated with a greater number of intraocular surgeries performed [12, 15]. However, further investigations of the specific nature and clinical significance of these complications are essential to gain a more comprehensive understanding of the challenges faced by individuals undergoing treatment and recovering from ocular toxoplasmosis [33, 35].

As depicted in Table 2, PPV with internal limiting membrane peeling is considered a potentially effective treatment for MHs in the context of uveitis [36]. This approach aims to relieve forces contributing to MH development [16]. Despite limited published literature, MH associated with uveitis often involves a more fragile retina due to prior inflammation, potentially influencing functional outcomes. This meta-analysis demonstrated a high success rate in MH closure achieved in 98% of patients. BCVA improved by a mean difference of 0.67 after surgeries, indicating the effectiveness of treatments for MH secondary to OT. Sousa et al. propose that the success rate may be attributed to factors such as patient selection and the surgical procedure. Specifically, patients with MH characterized by elevated borders and a visibly thick nonatrophic fovea had a higher probability of closure and improved vision potential following PPV and internal limiting membrane peeling. Additionally, the limited occurrence of large macular holes may have contributed to the overall success rate. Another favorable factor was the relatively short period between symptom onset and surgery [16].

Limitations

Although the results yielded significant insights into the safety and efficacy of surgical management for RD/RB and MH secondary to OT, it is crucial to take into consideration the limitations of this study. These studies were limited by several factors, including their retrospective nature and the variability of baseline patient features and treatment regimens. There are a relatively small number of patients, and the different types of RD and MH varies greatly among studies, the RD/RB and MH severity may be more advanced in some patients than another, potentially affecting the baseline characteristics. Other limitation of the present studies was the absence of information on various risk factors RD/RB and MH that could have confounded the severity of patients' prognoses. Many studies included in this analysis reported follow-up periods ≥ 1 month. However, long-term outcomes (≥ 12 months) beyond the follow-up period were assessed in just a few studies. It is crucial to assess the long-term stability of surgical effects.

Conclusions

In conclusion, this meta-analysis provides significant insights into the management RD/RB and MH secondary to OT. The study showed that the treatment approaches currently in use are effective, with a remarkable rate of retinal reattachment, MH closure and substantial improvements in visual acuity. However, the risk of complications and recurrence of RD highlights the importance of continuing research and refining treatment strategies to enhance the overall quality of care for people affected by ocular toxoplasmosis. Further randomized and long-term studies with evaluation of factors related to the disease and its surgical treatment and their influence on both anatomical and visual outcomes could provide valuable insights.

Availability of data and materials

The datasets used and analyzed during the current study are available from the corresponding author upon reasonable request.

Abbreviations

RD:

Retinal detachment

RPE:

Retinal pigment epithelium

RB:

Retinal break

SB:

Scleral buckling

PPV:

Pars plana vitrectomy

PR:

Pneumatic retinopexy

OT:

Ocular toxoplasmosis

RR:

Relative risk

MD:

Mean difference

IPDMA:

Individual patient data meta-analysis

BCVA:

Best-corrected visual acuity

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Acknowledgements

The authors received no financial support for this study

Funding

Not applicable.

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Authors and Affiliations

  1. Faculdade de Medicina, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil

    Dillan Cunha Amaral, Eduardo Henrique Cassins Aguiar, Guilherme Nunes Marques, Márcio Penha Morterá Rodrigues, José Eduardo Ferreira Manso & Ricardo Noguera Louzada

  2. Moorfields Eye Hospital, London, UK

    Mark Lane

  3. Faculdade de Medicina, Centro Universitário Max Planck, Indaiatuba, Brazil

    Luiza Visentin Cavassani

  4. Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil

    Milton Ruiz Alves, Mário Luiz Ribeiro Monteiro & Ricardo Noguera Louzada

  5. Instituto de Olhos São Sebastião, Largo Do Machado 54, 1208, Rio de Janeiro, 22221-020, Brazil

    Ricardo Noguera Louzada

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The study was conceptualized and designed by DA, RL and EA, who developed the overall framework and research questions. The data were independently extracted by GM and LC, and the statistical analyses were performed by DA using the software R. Authors MM, JM, MR, MA, and RL provided supervision throughout the research process, offering guidance in the interpretation of the results and ensuring methodological rigor. The main manuscript text was written by DA, EA, LC, GM, and ML. All the authors participated in reviewing and revising the manuscript for content, scientific rigor, and adherence to ethical standards.

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Correspondence to Ricardo Noguera Louzada.

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Amaral, D.C., Lane, M., Aguiar, E.H.C. et al. Surgical management of retinal detachment and macular holes secondary to ocular toxoplasmosis: a systematic review and meta-analysis. Int J Retin Vitr 10, 23 (2024). https://doi.org/10.1186/s40942-024-00540-w

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  • DOI: https://doi.org/10.1186/s40942-024-00540-w

Keywords

International Journal of Retina and Vitreous

ISSN: 2056-9920

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