Indications & patient selection

• Mild–moderate primary open-angle glaucoma (POAG), juvenile glaucoma, some secondary open-angle glaucomas. (PMC)
• Good angle anatomy (open anterior chamber angle, limited extensive PAS). (Dove Medical Press)
• Can be combined with phacoemulsification or done standalone (choose combined if cataract present). (BioMed Central)

Contraindications / caution: heavily scarred or synechial angles (extensive PAS), neovascular glaucoma, or where canal cannot be cannulated. (BioMed Central)

Outcomes & safety (summary)

• Multiple series and systematic reviews report meaningful IOP reduction and medication reduction after GATT with an acceptable safety profile; hyphema is the most frequent complication and commonly self-resolves. Long-term predictors of success include less PAS and less distal outflow resistance. (PMC)

Recommended learning resources (articles, texts, videos)

(watch several technique videos before attempting first cases — then begin with supervised/hands-on training if possible)

Key reviews & articles

• “The Efficacy and Safety of the GATT Procedure in Open-Angle Glaucoma — 6-month results.” Ćwiklińska-Haszcz et al., 2023 (open access). (PMC)
• GATT technique & case series review (Lehmann-Clarke et al., 2020) — detailed technique and pediatric examples. (PMC)
• Review of Ophthalmology — Getting Started With GATT (practical tips for first cases). (com)
• OMNI/Device IFU (TRAB360/OMNI) — device indications, IFU and instructions if you plan to use these systems. (United States)

High-quality teaching videos (watch repeatedly)

• “HD Didactic: GATT Surgery — 3-Minute Step-by-Step” — concise step video. (YouTube)
• “GATT Surgery Step by Step” — Dr. Jaime Martins (YouTube). (YouTube)
• “Passing the Right Way — Decoding Suture” — detailed suture GATT technique. (YouTube)
• Multiple operative demonstrations (Peter Chang, Sirisha Senthil, etc.) — helpful to observe variations and manage resistance. (YouTube)

Collections & technique compendia

• GATTWorld — technique chapter & curated materials (practical step sequences). (com)

Practical tips before your first case

1. Practice gonio visualization — tilt/microscope orientation and gonioprism handling at the wet lab before live cases. (com)
2. Start combined cases (GATT + phaco) if you are comfortable with cataract steps — a single anesthesia session and clearer AC helps orientation. (BioMed Central)
3. Have backup equipment (alternate suture or microcatheter, viscoelastic, AC maintainer) and a plan for managing hyphema or failed cannulation. (com)
4. Observe/assist an experienced surgeon for 1–3 cases. Review multiple videos beforehand. (YouTube)

Selected citations / quick links (open resources)

• GATT technique & series (Lehmann-Clarke et al., 2020). (PMC)
• Efficacy & safety systematic 6-month review (Ćwiklińska-Haszcz et al., 2023). (PMC)
• Review of Ophthalmology — Getting Started With GATT (practical tips). (com)
• OMNI / TRAB360 product / IFU information (device guidance). (United States)
• Short didactic procedural video (HD Didactic GATT). (YouTube)
• YouTube surgical demonstrations and technique variations (search: “GATT surgery”, “suture GATT”, “illuminated microcatheter GATT”). (YouTube)