- ICH GCP
- US Clinical Trials Registry
- Klinisk forsøg 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.
Studieoversigt
Status
Betingelser
Intervention / Behandling
Undersøgelsestype
Tilmelding
Fase
- Fase 2
Kontakter og lokationer
Studiesteder
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Vienna, Østrig, 1090
- Department of Clinical Pharmacology, Medical University of Vienna
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Deltagelseskriterier
Berettigelseskriterier
Aldre berettiget til at studere
Tager imod sunde frivillige
Køn, der er berettiget til at studere
Beskrivelse
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
Studieplan
Hvordan er undersøgelsen tilrettelagt?
Design detaljer
- Primært formål: Behandling
- Tildeling: Randomiseret
- Interventionel model: Crossover opgave
- Maskning: Dobbelt
Hvad måler undersøgelsen?
Primære resultatmål
Resultatmål |
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choroidal blood flow
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fundus pulsation amplitude
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Samarbejdspartnere og efterforskere
Sponsor
Datoer for undersøgelser
Studer store datoer
Studiestart
Datoer for studieregistrering
Først indsendt
Først indsendt, der opfyldte QC-kriterier
Først opslået (Skøn)
Opdateringer af undersøgelsesjournaler
Sidste opdatering sendt (Skøn)
Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier
Sidst verificeret
Mere information
Begreber relateret til denne undersøgelse
Yderligere relevante MeSH-vilkår
- Lægemidlers fysiologiske virkninger
- Adrenerge beta-antagonister
- Adrenerge antagonister
- Adrenerge midler
- Neurotransmittermidler
- Molekylære mekanismer for farmakologisk virkning
- Anti-arytmimidler
- Antihypertensive midler
- Vasodilatorer
- Parasympatholytika
- Autonome agenter
- Agenter fra det perifere nervesystem
- Muskarine antagonister
- Kolinerge antagonister
- Kolinerge midler
- Enzymhæmmere
- Beskyttelsesagenter
- Adrenerge alfa-agonister
- Adrenerge agonister
- Kardiotoniske midler
- Adjuvanser, anæstesi
- Bronkodilatatorer
- Anti-astmatiske midler
- Respiratoriske midler
- Sympatomimetika
- Vasokonstriktormidler
- Mydriatics
- Nasale dekongestanter
- Adrenerge alfa-1-receptoragonister
- Propranolol
- Atropin
- Phenylephrin
- Oxymetazolin
- omega-N-methylarginin
Andre undersøgelses-id-numre
- OPHT-180601
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