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Anterior Chamber Angle and Intraocular Pressure Control After Phacoemulsification in Primary Angle Closure With
Woo Keun Song1, Kyung Rim Sung, Ko Eun Kim
1Department of Ophthalmology, College of Medicine, Asan Medical Center, University of Ulsan, Seoul, Korea.
Journal of Glaucoma
|June 27, 2024
Summary
Understanding primary angle closure disease (PACD) mechanisms is key for managing intraocular pressure (IOP) after phacoemulsification. Different angle closure types show distinct IOP control patterns post-surgery, influencing glaucoma progression.
Area of Science:
- Ophthalmology
- Glaucoma Research
- Anterior Segment Imaging
Background:
- Primary angle closure disease (PACD) poses a significant risk for glaucoma due to elevated intraocular pressure (IOP).
- Phacoemulsification is a common treatment, but its effectiveness in IOP control varies based on the underlying angle closure mechanism.
- Accurate characterization of anterior chamber angle (ACA) features is crucial for predicting surgical outcomes.
Purpose of the Study:
- To investigate the relationship between ACA characteristics, measured by swept-source anterior segment optical coherence tomography (SS AS-OCT), and IOP control after phacoemulsification in PACD eyes.
- To differentiate IOP control based on distinct angle closure mechanisms: pupillary block (PB), plateau iris configuration (PIC), and exaggerated lens vault (ELV).
Main Methods:
- Retrospective cohort study of 85 PACD patients, classified into PB (34 eyes), PIC (23 eyes), and ELV (28 eyes) groups.
- Preoperative and 1-month postoperative ACA parameters measured using SS AS-OCT.
- IOP monitored preoperatively and for 6 months postoperatively; IOP reduction and fluctuation analyzed.
Main Results:
- The PIC group exhibited the least postoperative IOP reduction (P=0.023).
- Preoperative ACA measurements correlated with IOP reduction in ELV and PB groups; postoperative measurements were relevant for the PIC group.
- Iridotrabecular contact (ITC) index and area changes correlated with IOP reduction in PB and ELV groups, but not PIC. Postoperative ITC parameters correlated with IOP fluctuation solely in the PIC group.
Conclusions:
- Different angle closure mechanisms influence IOP control post-phacoemulsification distinctly.
- SS AS-OCT parameters, including ITC index and area, demonstrate varied associations with postoperative IOP control.
- Classification of angle closure mechanisms is essential for optimizing IOP management and preventing glaucoma progression in PACD patients.
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