Effects of Latanoprost on Choroidal Blood Flow Regulation in Human Subjects

Study Overview
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Brief Summary
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Latanoprost is a synthetic prodrug of 17-phenyl-substituted prostaglandin F2α analog. Used at a dose of one drop per day, it has been reported to produce a 30 to 35% reduction in intraocular pressure. Its mechanism of activation involves augmentation of the eye's natural uveoscleral outflow capacity . There is evidence that ocular blood flow plays a role in the clinical course of glaucoma. Glaucoma medication that lowers IOP simultaneously increases ocular blood perfusion pressure, which in turn may increase ocular blood flow. This could well contribute to the partially contradicting results concerning ocular hemodynamic effects of latanoprost. In vitro studies indicate that latanoprost has no effect on ocular vascular tone in therapeutical doses. By contrast, it has been reported in several studies that latanoprost 0.005% increases pulsatile ocular blood flow in patients with primary open angle glaucoma and normal tension glaucoma. This increase in pulsatile ocular blood flow mainly reflects an increase in the choroidal circulation. Little is known about the potential effect of latanoprost on choroidal blood flow regulation in humans. The present study therefore tries to elucidate whether treatment with latanoprost may alter choroidal blood flow regulation during artificial changes in ocular perfusion pressure. In addition, the present study aims to clarify whether the change in choroidal blood flow after latanoprost administration are due to direct vasoactive effects or due to the increase in ocular perfusion pressure. The second alternative may have important implications on our understanding of glaucoma treatment, because reduction of IOP may then per se result in normalization of ocular blood flow regulation.

Official Title
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Effects of Latanoprost on Choroidal Blood Flow Regulation in Human Subjects

Conditions
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Ocular Physiology, Intraocular Pressure, Regional Blood Flow

Intervention / Treatment
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* Drug: Latanoprost 0.005%, Xalatan®
* Drug: Placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Men aged between 19 and 35 years, nonsmokers Body mass index between 15th and 85th percentile (Must et al. 1991) Normal findings in the medical history and physical examination unless the investigator considers an abnormality to be clinically irrelevant Normal ophthalmic findings, ametropia < 3 dpt. Exclusion Criteria: Regular use of medication, abuse of alcoholic beverages, participation in a clinical trial in the 3 weeks preceding the study Treatment in the previous 3 weeks with any drug Symptoms of a clinically relevant illness in the 3 weeks before the first study day History or presence of gastrointestinal, liver or kidney disease, or other conditions known to interfere with distribution, metabolism or excretion of study drugs Blood donation during the previous 3 weeks Ametropia >= 3 dpt Iris bicolor

Ages Eligible for Study
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Minimum Age: 19 Years
Maximum Age: 35 Years

Sexes Eligible for Study
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Male

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Diagnostic
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: 1<br>Latanoprost 0.005%, Xalatan® | Drug: Latanoprost 0.005%, Xalatan®<br>* Substance: Latanoprost 0.005%, Xalatan® (Pharmacia Austria Ges.m.b.H. Oberlaaer Straße 251, 1101 Vienna) Dosage form: topical application in one eye Dosage: 1 drop in the evening for 14 days<br>|
| Placebo Comparator: 2<br>Vehicle to latanoprost (eyedrops containing the same stabilizers as latanoprost, but no active drug) | Drug: Placebo<br>* Substance: Vehicle to latanoprost (eyedrops containing the same stabilizers as latanoprost, but no active drug) Dosage form: topical application in one eye Dosage: 1 drop in the evening for 14 days<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Choroidal pressure-flow relationship |  | in total 4 hours | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Latanoprost, Choroidal Blood Flow, Intraocular Pressure