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Sponsored by: |
Medical University of Vienna |
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Information provided by: | Medical University of Vienna |
ClinicalTrials.gov Identifier: | NCT00280501 |
There is evidence from a variety of animal studies that choroidal blood flow is under neural control. By contrast, only little information is available from human studies. Recent results indicate that a light/dark transition is associated with a reduction in choroidal blood flow due to an unknown mechanism. We have shown that during unilateral dark/light transitions both eyes react with choroidal vasoconstriction strongly indicating a neural mechanism responsible for the blood flow changes.
Dopamine has been discussed as a chemical messenger for light adaptation. However, dopaminergic effects in the eye are not restricted to synaptic sites of release, but dopamine also diffuses to the outer retinal layers and pigment epithelium. Accordingly, dopaminergic effects also include a modulatory role on retinal vessel diameter and animal studies provide evidence for vasodilatory effects in the choroid. There is evidence that during darkness retinal and choroidal dopamine levels decrease. Accordingly, dopamine could provide a modulatory input to the light/dark transition induced changes of choroidal circulation. The aim of the present study is to test this hypothesis.
Condition | Intervention |
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Regional Blood Flow Ocular Physiology |
Drug: Quetiapine (drug) Drug: Sulpiride (drug) Drug: Placebo |
Study Type: | Interventional |
Study Design: | Treatment, Randomized, Double Blind (Subject, Investigator), Placebo Control, Crossover Assignment, Safety/Efficacy Study |
Official Title: | Dopaminergic Modulation of Choroidal Blood Flow Changes During Dark/Light Transitions |
Enrollment: | 21 |
Study Start Date: | August 2005 |
Study Completion Date: | August 2006 |
Primary Completion Date: | August 2006 (Final data collection date for primary outcome measure) |
Arms | Assigned Interventions |
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1: Active Comparator
Quetiapine
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Drug: Quetiapine (drug)
Quetiapine (Seroquel 100mg-film-coated tablet, AstraZeneca Vienna, Austria) Dose: 100 mg tablet oral single dose
Drug: Sulpiride (drug)
Sulpiride (Dogmatil 200mg-tablet, Synthélabo Groupe, Le Plessis Robinson, France) Dose: one half of 200 mg tablet oral single dose
Drug: Placebo
Placebo
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2: Active Comparator
Sulpiride
|
Drug: Quetiapine (drug)
Quetiapine (Seroquel 100mg-film-coated tablet, AstraZeneca Vienna, Austria) Dose: 100 mg tablet oral single dose
Drug: Sulpiride (drug)
Sulpiride (Dogmatil 200mg-tablet, Synthélabo Groupe, Le Plessis Robinson, France) Dose: one half of 200 mg tablet oral single dose
Drug: Placebo
Placebo
|
3: Placebo Comparator
Placebo
|
Drug: Quetiapine (drug)
Quetiapine (Seroquel 100mg-film-coated tablet, AstraZeneca Vienna, Austria) Dose: 100 mg tablet oral single dose
Drug: Sulpiride (drug)
Sulpiride (Dogmatil 200mg-tablet, Synthélabo Groupe, Le Plessis Robinson, France) Dose: one half of 200 mg tablet oral single dose
Drug: Placebo
Placebo
|
Ages Eligible for Study: | 18 Years to 35 Years |
Genders Eligible for Study: | Male |
Accepts Healthy Volunteers: | Yes |
Inclusion Criteria:
Exclusion Criteria:
Austria | |
Department of Clinical Pharmacology | |
Vienna, Austria, 1090 |
Principal Investigator: | Gabriele Fuchsjaeger-Mayrl, MD | Department of Clinical Pharmacology |
Responsible Party: | Department of Clinical Pharmacology, Medical University of Vienna ( Gabriele Fuchsjaeger-Mayrl, MD ) |
Study ID Numbers: | OPHT-160905 |
Study First Received: | January 19, 2006 |
Last Updated: | July 8, 2008 |
ClinicalTrials.gov Identifier: | NCT00280501 |
Health Authority: | Austria: Federal Ministry for Health and Women |
Sulpiride Quetiapine Light/dark transition Choroidal blood flow |
Sulpiride Quetiapine Dopamine |
Neurotransmitter Agents Tranquilizing Agents Molecular Mechanisms of Pharmacological Action Physiological Effects of Drugs Psychotropic Drugs Central Nervous System Depressants Dopamine Antagonists |
Antipsychotic Agents Pharmacologic Actions Therapeutic Uses Dopamine Agents Antidepressive Agents, Second-Generation Central Nervous System Agents Antidepressive Agents |