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Choroidal Thickness During Changes in Intraocular Pressure and Arterial Blood Pressure
Age-related macular degeneration (AMD) and glaucoma are among the leading causes of blindness in the western world. Elevated intraocular pressure (IOP) is a well known major risk factor for glaucoma. In addition, there is growing evidence that vascular factors, including arterial hypertension and hypotension, may play a role in the pathogenesis of AMD and glaucoma. To gain more insight into these mechanisms in humans is the primary goal of the present study.
Optical coherence tomography (OCT) delivers three dimensional, volumetric reflectivity information through transparent media in vivo. Moreover, the images show a high choroidal penetration and a resolution comparable to an histologic examination when infrared light sources are used. Because of its non-invasive character, OCT provides an ideal method for diagnosis and monitoring of retinal and choroidal abnormalities.
The present study aims to investigate whether choroidal thickness is temporarily altered by changes in IOP or systemic hemodynamic parameters. IOP will be increased by the use of a suction cup technique, mean arterial blood pressure will be altered by intravenously administered Phenylephrine or Sodium-Nitroprusside.
Studie Overzicht
Toestand
Conditie
Studietype
Inschrijving (Werkelijk)
Fase
- Niet toepasbaar
Contacten en locaties
Studie Locaties
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Vienna, Oostenrijk, 1090
- Department of Clinical Pharmacology, Medical University of Vienna
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Deelname Criteria
Geschiktheidscriteria
Leeftijden die in aanmerking komen voor studie
Accepteert gezonde vrijwilligers
Geslachten die in aanmerking komen voor studie
Beschrijving
Inclusion Criteria:
- Men and women aged between 18 and 35 years, nonsmokers
- Men and women will be included in equal parts
- Normal findings in the medical history and physical examination unless the investigator considers an abnormality to be clinically irrelevant
- Normal findings in the laboratory testings unless the investigator considers an abnormality to be clinically irrelevant
- Normal ophthalmic findings, ametropia less than 1 diopter
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 (except oral contraceptives)
- Symptoms of a clinically relevant illness in the 3 weeks before the first study day
- Blood donation during the previous 3 weeks History of hypersensitivity to the trial drugs 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
- History of migraine
- Pregnancy
Studie plan
Hoe is de studie opgezet?
Ontwerpdetails
- Primair doel: Fundamentele wetenschap
- Toewijzing: Gerandomiseerd
- Interventioneel model: Crossover-opdracht
- Masker: Verdrievoudigen
Wapens en interventies
Deelnemersgroep / Arm |
Interventie / Behandeling |
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Actieve vergelijker: Sodium-Nitroprusside
Nipruss®, Sanol-Schwarz, Monheim, Germany 0, 0.5, 1 and 2 µg/kg/min, each infusion step for 5 minutes, total infusion period of 20 minutes
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Neosynephrine®, Winthrop Breon Laboratories New York, NY, USA 0, 0.5, 1 and 2 μg/kg/min, each infusion step for 5 minutes, total infusion period of 20 minutes
Nipruss®, Sanol-Schwarz, Monheim, Germany 0, 0.5, 1 and 2 µg/kg/min, each infusion step for 5 minutes, total infusion period of 20 minutes
experimental stepwise increase of intraocular pressure while measurement of choroidal thickness suction force of 25, 50, 75, and 100 mmH
intraoculaire drukmetingen
Optical coherence tomography is a widely used non-invasive method to image the retina and choroid.
Using a 1060nm light source coupled to a commercially available OCT system (Heidelberg Engineering, Heidelberg, Germany) allows for the measurement of choroidal thickness
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Actieve vergelijker: Phenylephrine
Neosynephrine®, Winthrop Breon Laboratories New York, NY, USA 0, 0.5, 1 and 2 μg/kg/min, each infusion step for 5 minutes, total infusion period of 20 minutes
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Neosynephrine®, Winthrop Breon Laboratories New York, NY, USA 0, 0.5, 1 and 2 μg/kg/min, each infusion step for 5 minutes, total infusion period of 20 minutes
Nipruss®, Sanol-Schwarz, Monheim, Germany 0, 0.5, 1 and 2 µg/kg/min, each infusion step for 5 minutes, total infusion period of 20 minutes
experimental stepwise increase of intraocular pressure while measurement of choroidal thickness suction force of 25, 50, 75, and 100 mmH
intraoculaire drukmetingen
Optical coherence tomography is a widely used non-invasive method to image the retina and choroid.
Using a 1060nm light source coupled to a commercially available OCT system (Heidelberg Engineering, Heidelberg, Germany) allows for the measurement of choroidal thickness
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Actieve vergelijker: Suction Cup
suction force of 25, 50, 75, and 100 mmHg
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Neosynephrine®, Winthrop Breon Laboratories New York, NY, USA 0, 0.5, 1 and 2 μg/kg/min, each infusion step for 5 minutes, total infusion period of 20 minutes
Nipruss®, Sanol-Schwarz, Monheim, Germany 0, 0.5, 1 and 2 µg/kg/min, each infusion step for 5 minutes, total infusion period of 20 minutes
experimental stepwise increase of intraocular pressure while measurement of choroidal thickness suction force of 25, 50, 75, and 100 mmH
intraoculaire drukmetingen
Optical coherence tomography is a widely used non-invasive method to image the retina and choroid.
Using a 1060nm light source coupled to a commercially available OCT system (Heidelberg Engineering, Heidelberg, Germany) allows for the measurement of choroidal thickness
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Wat meet het onderzoek?
Primaire uitkomstmaten
Uitkomstmaat |
Tijdsspanne |
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Choroidal thickness
Tijdsspanne: 18 months
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18 months
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Secundaire uitkomstmaten
Uitkomstmaat |
Tijdsspanne |
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Systolic/diastolic blood pressure (non-invasive)
Tijdsspanne: 18 months
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18 months
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Intraocular pressure (IOP)
Tijdsspanne: 18 months
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18 months
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Medewerkers en onderzoekers
Sponsor
Onderzoekers
- Hoofdonderzoeker: Gerhard Garhöfer, MD, PD, Department of Clinical Pharmacology, Medical University of Vienna
Studie record data
Bestudeer belangrijke data
Studie start
Primaire voltooiing (Werkelijk)
Studieregistratiedata
Eerst ingediend
Eerst ingediend dat voldeed aan de QC-criteria
Eerst geplaatst (Schatting)
Updates van studierecords
Laatste update geplaatst (Schatting)
Laatste update ingediend die voldeed aan QC-criteria
Laatst geverifieerd
Meer informatie
Termen gerelateerd aan deze studie
Aanvullende relevante MeSH-voorwaarden
- Fysiologische effecten van medicijnen
- Adrenerge middelen
- Neurotransmitter agenten
- Moleculaire mechanismen van farmacologische werking
- Antihypertensiva
- Vaatverwijdende middelen
- Autonome agenten
- Agenten van het perifere zenuwstelsel
- Beschermende middelen
- Adrenerge alfa-agonisten
- Adrenerge agonisten
- Cardiotone middelen
- Agenten van het ademhalingssysteem
- Sympathicomimetica
- Vasoconstrictieve middelen
- Mydriatica
- Stikstofoxidedonoren
- Nasale decongestiva
- Adrenerge alfa-1-receptoragonisten
- Fenylefrine
- Oxymetazoline
- Nitropruszijde
Andere studie-ID-nummers
- OPHT-151010
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