Effect of Needle Gauge Size on Pain During Intravitreal Anti-VEGF Injection: A Systematic Review and Network Meta-Analysis

• Published in: Ophthalmology and therapy Vol. 13; no. 3; pp. 801 - 817
• Main Authors: Butler, Emilie T. S., Bjerager, Jakob, Eriksen, Nathalie S., Hajari, Javad N., Schneider, Miklos, Faber, Carsten, Subhi, Yousif
• Format: Journal Article
• Language: English
• Published: Cheshire Springer Healthcare 01.03.2024; Adis, Springer Healthcare
• Subjects: Anti-VEGF; Internal Medicine; Intravitreal injection; Medicine; Medicine & Public Health; Network meta-analysis; Ophthalmology; Original Research; Pain; Systematic review; Systematic review; Network meta-analysis; Anti-VEGF; Pain; Intravitreal injection
• ISSN: 2193-8245; 2193-6528
• DOI: 10.1007/s40123-023-00879-7

Introduction Concerns related to pain from intravitreal injections are one of the key factors mentioned by patients when asked about therapy. In this systematic review and network meta-analysis, we evaluate the literature of comparative clinical trials on the relationship between needle gauge size and pain experience during intravitreal anti-vascular endothelial growth factor (anti-VEGF) therapy. Methods We searched 12 literature databases on 14 October 2023 for comparative studies of gauge sizes for intravitreal anti-VEGF injections. The primary outcome of interest was the reported pain experience immediately after the injection. All outcomes of pain were transformed into standardized effect sizes using Cohen’s d . Using a network meta-analysis approach, we were able to compare all gauge sizes and rank them according to the reported pain experience. Results We identified nine eligible studies with data on a total of 998 patients and 1004 eyes. Needle sizes studied were 26-gauge, 27-gauge, 29-gauge, 30-gauge, 32-gauge, 33-gauge, and 34-gauge. A complete network was present, which allowed for a network meta-analysis. We used the thickest (26-gauge) needle as the reference group and observed a clear trend of lower pain experience with thinner gauge sizes ( d : −0.4, d : −2.7, d : −3.8, d : −4.8, d : −4.5, and d : −5.3; respectively, for 27-gauge, 29-gauge, 30-gauge, 32-gauge, 33-gauge, and 34-gauge). Conclusion A gauge size of 30 or thinner may minimize patient discomfort related to intravitreal anti-VEGF therapy.