Different lasers and techniques for proliferative diabetic retinopathy.

Area of Science:

• Ophthalmology
• Medical Technology
• Retinal Diseases

Background:

• Diabetic retinopathy (DR) is a progressive complication of diabetes affecting retinal microvasculature.
• Proliferative DR (PDR) is a severe form of DR that can lead to vision loss.
• Argon laser photocoagulation, guided by the Early Treatment of Diabetic Retinopathy Study (ETDRS), has been the standard PDR treatment.

Purpose of the Study:

• To evaluate the effectiveness and safety of non-argon laser types and modified laser protocols for PDR treatment.
• To compare alternative laser wavelengths, power settings, pulse durations, and burn patterns against standard ETDRS-specified argon laser pan-retinal photocoagulation (PRP).

Main Methods:

• Systematic review of randomized controlled trials (RCTs) comparing alternative laser modalities or protocols to standard argon laser PRP for PDR.
• Searched multiple databases including Cochrane Central Register of Controlled Trials, MEDLINE, Embase, LILACS, ISRCTN, ClinicalTrials.gov, and ICTRP.
• Included studies using GRADE approach for certainty of evidence assessment.

Main Results:

• Eleven studies were included, comparing Nd:YAG or diode lasers, and various argon laser modifications against standard argon laser PRP.
• Evidence for Nd:YAG versus argon laser was of very low certainty for most outcomes.
• Diode laser showed moderate-certainty evidence of being more painful than argon laser, with very low-certainty evidence for other outcomes.
• Several modified argon laser protocols (e.g., different exposure durations, patterns) showed low to very low-certainty evidence for efficacy and safety, often with imprecise estimates.

Conclusions:

• Limited evidence exists regarding the efficacy and safety of alternative laser systems and strategies for PDR compared to standard argon laser photocoagulation.
• Further high-quality research is necessary to establish the benefits of newer laser techniques and protocols in managing PDR.