The Role of Complement Factor H Polymorphism in the Regulation of Choroidal Vascular Tone in Young Healthy Subjects

April 6, 2022 updated by: Gerhard Garhofer, Medical University of Vienna
Age related macular degeneration (AMD) is a multifactorial disease with a strong genetic component. Given that it is known that impaired regulation of choroidal vascular tone is present in patients with AMD, the current study seeks to investigate whether genetic polymorphisms in risk alleles for AMD are associated with altered choroidal blood flow regulation in healthy subjects. For this purpose a total of 220 healthy volunteers will be included. Choroidal blood flow regulation will be evaluated by measuring choroidal blood flow during isometric exercise. In addition, flicker induced vasodilatation will be studied and retinal vessel calibers will assessed, as well as retinal thickness and macular pigment optical density.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Anticipated)

220

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

  • Austria
      • Vienna, Austria, 1090
        • Recruiting
        • Department of Clinical Pharmacology, Medical University of Vienna
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 45 years (Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Men and women aged between 18 and 45 years, nonsmokers
  • Normal findings in the medical history and physical examination unless the investigator considers an abnormality to be clinically irrelevant
  • Systolic blood pressure < 160 mmHg, diastolic blood pressure < 90 mmHg
  • Normal ophthalmic findings, ametropia less than 3 diopters

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 hormonal contraceptives)
  • Symptoms of a clinically relevant illness in the 3 weeks before the first study day
  • Blood donation during the previous 3 weeks
  • History or family history of epilepsy
  • Pregnancy, planned pregnancy or lactating

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Other
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Other: Healthy Subjects
Genetic: the polymerase chain reaction (PCR)

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Choroidal blood flow during isometric exercise (LDF)
Time Frame: 1 day
1 day

Secondary Outcome Measures

Outcome Measure
Time Frame
Flicker induced vasodilatation, expressed as percent change to baseline (DVA)
Time Frame: 1 day
1 day
Genotyping (PCR)
Time Frame: 1 day
1 day
Retinal vessel calibers and AV- ratio (DVA)
Time Frame: 1 day
1 day
Laser Speckle Flowmetry (LSFG)
Time Frame: 1 day
1 day

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Medical University of Vienna

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

March 1, 2015

Primary Completion (Anticipated)

September 2, 2023

Study Completion (Anticipated)

September 2, 2023

Study Registration Dates

First Submitted

March 21, 2014

First Submitted That Met QC Criteria

March 31, 2014

First Posted (Estimate)

April 3, 2014

Study Record Updates

Last Update Posted (Actual)

April 7, 2022

Last Update Submitted That Met QC Criteria

April 6, 2022

Last Verified

April 1, 2022

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • OPHT-040214

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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