Trabeculectomy Bleb Characteristics in Relation to Bleb Success Using Anterior Segment Optical Coherence Tomography-A...

Area of Science:

• Ophthalmology
• Glaucoma Surgery
• Medical Imaging

Background:

• Trabeculectomy is a common surgical procedure for glaucoma management.
• Postoperative monitoring of bleb morphology is crucial for predicting surgical success.
• Anterior segment optical coherence tomography (ASOCT) offers high-resolution imaging of the bleb.

Purpose of the Study:

• To evaluate and quantify the relationship between bleb characteristics visualized by ASOCT and the outcomes of trabeculectomy surgery.
• To determine if specific ASOCT-derived bleb features can predict surgical success.

Main Methods:

• A comprehensive literature search was performed across major databases (Medline, Embase, Cochrane, Scopus) for studies published within the last 20 years.
• Included studies focused on glaucoma, trabeculectomy, and ASOCT, collecting data on patient characteristics, bleb success definitions, clinical outcomes, and ASOCT bleb features.
• A meta-analysis was conducted on eligible studies, with a narrative synthesis for studies not suitable for meta-analysis.

Main Results:

• Eleven studies involving 528 eyes were included in the meta-analysis.
• Successful blebs exhibited significantly greater mean height (MD: 0.38 mm), thicker walls (MD: 0.21 mm), and lower reflectivity (MD: -48.9%) compared to failed blebs.
• Early ASOCT bleb parameters were significant predictors of success up to 12 months postoperatively.

Conclusions:

• ASOCT features such as increased bleb height, thicker bleb walls, and reduced reflectivity are strongly associated with successful trabeculectomy outcomes.
• ASOCT is a valuable tool for monitoring post-surgical blebs and predicting the likelihood of long-term success.
• Standardized ASOCT imaging protocols can guide timely interventions to optimize surgical outcomes.