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Doppler Optical Coherence Tomography of Retinal Circulation
Published on: September 18, 2012
Color Doppler imaging study in patients with primary open-angle glaucoma treated with timolol 0.5% and carteolol 2%
P Montanari1, P Marangoni, A Oldani
1Eye Clinic of the University of Milano, Italy. roberto.ratiglia@unimi.it
European Journal of Ophthalmology
|October 30, 2001
Summary
Carteolol 2%, a beta-blocker with intrinsic sympathomimetic activity, improved visual field indexes in primary open-angle glaucoma patients. This medication significantly reduced resistance in short posterior ciliary arteries, suggesting improved optic nerve head perfusion.
Area of Science:
- Ophthalmology
- Cardiovascular Research
- Pharmacology
Background:
- Primary open-angle glaucoma (POAG) is a leading cause of irreversible blindness.
- Ocular hemodynamics play a crucial role in glaucoma progression.
- Beta-blockers are a cornerstone of POAG management, but their effects on ocular blood flow vary.
Purpose of the Study:
- To compare the hemodynamic effects of carteolol 2% (with intrinsic sympathomimetic activity) versus timolol maleate 0.5% (without) in POAG patients.
- To evaluate changes in ocular vascular resistance using color Doppler imaging (CDI).
- To assess the impact on visual field parameters.
Main Methods:
- 20 POAG patients on timolol maleate underwent visual field testing and CDI of ocular arteries.
- Patients were switched to carteolol 2% for six months.
- Examinations were repeated, and data analyzed using Student's t-test.
Main Results:
- Intraocular pressure remained stable between treatments.
- Carteolol 2% significantly improved visual field mean sensitivity (MS) and reduced mean defect (MD).
- A significant decrease in the resistance index of short posterior ciliary arteries (SPCA) was observed with carteolol, while other vessels showed no significant change.
Conclusions:
- Carteolol 2% demonstrated a beneficial effect on visual function in POAG patients.
- The reduction in SPCA resistance suggests improved optic nerve head perfusion due to carteolol's intrinsic sympathomimetic activity.
- This may offer a protective effect on visual function in glaucoma.
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