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The Correlation Between Aqueous Humor Flow and IOP Before and After Trabectome: Developing a Grading System to
Toshihiko Ueda1, Hirotaka Suzumura2, Murray Johnstone3
1Nihonmatsu Eye Hospital, Tokyo, Japan. ueda@nihonmatsu.net.
Ophthalmology and Therapy
|April 12, 2018
Summary
A new grading system for aqueous humor outflow (AHO) objectively quantifies flow, correlating higher scores with lower intraocular pressure (IOP) in glaucoma patients. This method aids in evaluating glaucoma treatment effectiveness.
Area of Science:
- Ophthalmology
- Glaucoma Research
- Medical Imaging Analysis
Background:
- Developing objective methods to quantify aqueous humor outflow (AHO) is crucial for glaucoma management.
- Current assessment options for glaucoma treatment efficacy require enhancement with objective data.
Purpose of the Study:
- To develop and validate a novel grading system for objective quantification of AHO.
- To assess the correlation between the developed AHO grading system and intraocular pressure (IOP).
Main Methods:
- Retrospective observational study of 73 primary open-angle glaucoma patients undergoing Trabectome procedures.
- A four-level grading system (G0-G3) was applied to three regions of the nasal hemisphere based on video examinations.
- Composite AHO scores were calculated and correlated with IOP; red blood cell (RBC) cluster speed in episcleral veins (ESV) was also analyzed.
Main Results:
- A high composite AHO score significantly correlated with lowered IOP at 3 months post-procedure (average IOP decreased from 26 to 15 mmHg).
- An AHO grade of ≥G2 in any region predicted IOP < 20 mmHg.
- RBC cluster speed in ESVs showed a significant range across grades (G1: 0.68 mm/s, G2: 1.8 mm/s, G3: 6.8 mm/s).
Conclusions:
- The developed AHO grading system demonstrates a significant correlation with reduced IOP.
- The system provides a reliable and objective measure of aqueous humor outflow.
- Findings support the utility of this grading system as an additional assessment tool for glaucoma treatment.
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