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Three Different Protocols of Corneal Collagen Crosslinking in Keratoconus: Conventional, Accelerated and Iontophoresis
Published on: November 12, 2015
Pediatric Crosslinking: Current Protocols and Approach
Júlia Polido1, Maria Emília Dos Xavier Santos Araújo2,3, João G Alexander2
1Department of Ophthalmology, Federal University of São Paulo (UNIFESP), Rua Botucatu, 806, Vila Clementino, São Paulo, SP, CEP 04023-062, Brazil. juliapolido@yahoo.com.br.
Insights
Pediatric keratoconus (KC) requires effective treatments. This review examines various corneal crosslinking (CXL) techniques, including standard, accelerated, and transepithelial methods, to determine the safest and most effective options for children.
Area of Science:
- Ophthalmology
- Corneal Surgery
- Pediatric Eye Care
Background:
- Pediatric keratoconus (KC) often presents more aggressively than in adults, increasing the risk of visual impairment.
- Corneal crosslinking (CXL) is a primary treatment to halt KC progression.
- Numerous CXL variations exist, necessitating a review of their pediatric efficacy and safety.
Purpose of the Study:
- To provide an updated literature review on corneal crosslinking (CXL) techniques for pediatric keratoconus (KC).
- To analyze the safety, efficacy, risks, and cost-effectiveness of current and emerging CXL methods in children.
- To identify the optimal CXL approach for the pediatric KC population.
Main Methods:
- Systematic review of English-language literature indexed in PubMed.
- Analysis of various CXL protocols: Standard CXL (SCXL), Accelerated CXL (ACXL), Transepithelial CXL (TCXL).
- Inclusion of novel techniques like contact lens-assisted CXL (CACXL), epithelial-island CXL (EI-CXL), and the Sub400 protocol, alongside riboflavin carrier variations (dextran-based vs. HPMC-based).
Main Results:
- Standard CXL (Dresden Protocol) demonstrates safety and effectiveness in pediatric KC.
- Accelerated CXL offers similar efficacy with reduced treatment time.
- Transepithelial CXL aims to minimize complications and patient discomfort.
- Emerging techniques address challenges with thinner corneas and offer alternative approaches.
Conclusions:
- While several CXL techniques show promise for pediatric KC, definitive evidence on the safest and most effective method is still evolving.
- Further research is needed to compare the long-term outcomes, safety profiles, and cost-effectiveness of different CXL protocols in pediatric patients.
- Understanding the nuances of each CXL approach is crucial for optimizing treatment strategies in young KC patients.
Abstract:
Keratoconus (KC) is likely to be more aggressive in the pediatric population, with a higher risk of progression and visual loss. Several techniques have been proposed for corneal crosslinking (CXL) so far. The standard CXL (SCXL) technique, or the Dresden Protocol, originally developed by Wollensak et al., has been shown to be safe and effective in the pediatric KC group. With similar efficacy to the conventional method, the accelerated CXL (ACXL) protocols proposed a reduced UVA exposure time by increasing the intensity of UVA irradiation. Transepithelial CXL (TCXL), considered an "epithelium-on" method, emerged as a strategy to improve safety and reduce postoperative complications and discomfort. For thinner corneas, we can highlight the use of hypoosmolar riboflavin and new studies, such as contact lens-assisted CXL (CACXL), the epithelial-island CXL (EI-CXL), and the Sub400 protocol. In addition to the different protocols used, another factor that changes CXL results is the type of carrier used: dextran-based or hydroxypropyl methylcellulose-based (HPMC) riboflavin solutions. There are several ways to perform a CXL surgery, and it is still unclear which method is the safest and most effective in the pediatric group. This review of the literature in English, available in PubMed, provides an update on corneal CXL in the pediatric KC group, exploring the data on the techniques currently used and under investigation, including their advantages, efficacy, safety profiles, risks, and cost analyses.
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