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Immediate changes in intraocular pressure after laser peripheral iridotomy in primary angle-closure suspects
Yuzhen Jiang1, Dolly S Chang, Paul J Foster
1State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China.
Ophthalmology
|November 1, 2011
Summary
Laser peripheral iridotomy can cause temporary intraocular pressure (IOP) spikes in primary angle-closure suspects. Higher laser energy and shallower anterior chambers increase the risk of an IOP rise after the procedure.
Area of Science:
- Ophthalmology
- Laser Surgery
- Glaucoma Research
Background:
- Primary angle-closure suspects are at risk of developing angle-closure glaucoma.
- Laser peripheral iridotomy (LPI) is a common procedure to prevent angle closure.
- Immediate changes in intraocular pressure (IOP) post-LPI require careful monitoring.
Purpose of the Study:
- To evaluate the immediate and short-term changes in intraocular pressure (IOP) following laser peripheral iridotomy (LPI).
- To identify risk factors associated with IOP elevation after LPI in primary angle-closure suspects.
Main Methods:
- Prospective, randomized controlled trial with a split-body design.
- 734 Chinese participants (50-70 years) with primary angle-closure suspects underwent LPI in one eye.
- Intraocular pressure (IOP) measured using Goldmann applanation tonometry pre-treatment, 1 hour, and 2 weeks post-treatment.
Main Results:
- A significant IOP spike (≥8 mmHg elevation) occurred in 9.8% of treated eyes at 1 hour and 0.82% at 2 weeks.
- Only 0.54% of eyes required medical intervention for IOP ≥30 mmHg immediately post-treatment.
- Increased laser energy and shallower central anterior chambers were associated with higher risk of IOP spikes.
Conclusions:
- Laser peripheral iridotomy (LPI) can cause transient IOP elevations in a small percentage of primary angle-closure suspects.
- Risk factors for post-LPI IOP spikes include higher laser energy and shallower anterior chamber depth.
- Close IOP monitoring is recommended in the immediate period following LPI.
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