- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00431392
Mechanisms of Choroidal Blood Flow Changes During Dark/Light Transitions
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 short lasting reduction in choroidal blood flow. We have shown that during unilateral dark/light transition both eyes react with choroidal vasoconstriction strongly indicating a neural mechanism.
The present studies investigate this possibility by using pharmacological interventions. The pharmacological agents tested include a nitric oxide synthase inhibitor, an alpha-receptor agonist (as a control substance for the blood pressure increasing nitric oxide synthase inhibitor), a muscarinic receptor blocker, and a non-specific beta-blocker. These drugs were chosen on the basis of previous animal experiments, as the systems, which are specifically influenced by these substances, are likely involved in neural control of choroidal blood flow.
Study Overview
Status
Conditions
Intervention / Treatment
Study Type
Enrollment
Phase
- Phase 2
Contacts and Locations
Study Locations
-
-
-
Vienna, Austria, 1090
- Department of Clinical Pharmacology, Medical University of Vienna
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
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 laboratory values unless the investigator considers an abnormality to be clinically irrelevant
- Normal ophthalmic findings, ametropy < 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 of hypersensitivity to the trial drug or to drugs with a similar chemical structure
- 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
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: Randomized
- Interventional Model: Crossover Assignment
- Masking: Double
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
---|
choroidal blood flow
|
fundus pulsation amplitude
|
Collaborators and Investigators
Sponsor
Study record dates
Study Major Dates
Study Start
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Estimate)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
- Physiological Effects of Drugs
- Adrenergic beta-Antagonists
- Adrenergic Antagonists
- Adrenergic Agents
- Neurotransmitter Agents
- Molecular Mechanisms of Pharmacological Action
- Anti-Arrhythmia Agents
- Antihypertensive Agents
- Vasodilator Agents
- Parasympatholytics
- Autonomic Agents
- Peripheral Nervous System Agents
- Muscarinic Antagonists
- Cholinergic Antagonists
- Cholinergic Agents
- Enzyme Inhibitors
- Protective Agents
- Adrenergic alpha-Agonists
- Adrenergic Agonists
- Cardiotonic Agents
- Adjuvants, Anesthesia
- Bronchodilator Agents
- Anti-Asthmatic Agents
- Respiratory System Agents
- Sympathomimetics
- Vasoconstrictor Agents
- Mydriatics
- Nasal Decongestants
- Adrenergic alpha-1 Receptor Agonists
- Propranolol
- Atropine
- Phenylephrine
- Oxymetazoline
- omega-N-Methylarginine
Other Study ID Numbers
- OPHT-180601
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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