Longitudinal changes in bleb morphology following the PAUL Glaucoma Implant visualized using ultrasonography

Area of Science:

• Ophthalmology
• Medical Imaging
• Glaucoma Surgery

Background:

• Glaucoma drainage device (GDD) surgery is a common treatment for refractory glaucoma.
• Postoperative bleb morphology assessment is crucial for predicting surgical outcomes.
• Longitudinal evaluation of bleb changes using non-invasive imaging is needed.

Purpose of the Study:

• To longitudinally evaluate bleb morphology using sonography after glaucoma drainage device (GDD) surgery.
• To assess the relationship between bleb characteristics and intraocular pressure (IOP) over time.

Main Methods:

• Prospective observational cohort study.
• 15-MHz ultrasound was used to assess bleb morphology (height, dimensions) up to 12 months postoperatively.
• Forty-eight eyes undergoing PGI implantation were enrolled.

Main Results:

• Mean bleb height increased significantly from postoperative day 14 to month 3, then stabilized.
• Absolute bleb height was significantly associated with higher IOP, independent of time.
• Early bleb enlargement correlated with higher IOP, but later changes did not.

Conclusions:

• Sonography reveals progressive bleb enlargement and remodeling after GDD surgery, stabilizing by 3-6 months.
• Absolute bleb height is a consistent indicator of IOP control post-GDD surgery.
• These findings offer longitudinal sonographic evidence of bleb changes and may inform clinical management.