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The Validity of Retinal Blood Flow Measurements During Hyperoxia in Humans Using Fourier Domain Color Doppler Optical Coherence Tomography (CDOCT)

This study has been completed.
Sponsor:
ClinicalTrials.gov Identifier:
NCT00431600
First Posted: February 6, 2007
Last Update Posted: September 21, 2012
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Information provided by:
Medical University of Vienna
  Purpose

Noninvasive monitoring of blood flow in retinal circulation may elucidate the progression and treatment of ocular disorders, including diabetic retinopathy, age-related macular degeneration and glaucoma.

Laser Doppler velocimetry (LDV), a noninvasive optical method combined with vessel size determination has been used extensively as a valuable research tool to examine blood flow dynamics in the human retina. However, no information on the velocity profile within the vessel is available. Ophthalmic color Doppler optical coherence tomography (CDOCT) provides laser Doppler information in addition to conventional optical coherence tomography, allowing the observation of blood flow dynamics simultaneously to imaging retinal structure.

We have recently demonstrated the feasibility of Fourier domain CDOCT to assess velocity profiles in human retinal vessels in vivo.

In the present study the validity of Fourier domain CDOCT for retinal blood flow measurements will be tested at baseline and during hyperoxia-induced vasoconstriction in humans by comparison with retinal blood flow measurements using a commercially available LDV system and the Zeiss retinal vessel analyzer (RVA)


Condition Intervention
Healthy Other: 100% Oxygen

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Diagnostic
Official Title: The Validity of Retinal Blood Flow Measurements During Hyperoxia in Humans Using Fourier Domain CDOCT

Further study details as provided by Medical University of Vienna:

Primary Outcome Measures:
  • Retinal blood flow (LDV, RVA) [ Time Frame: 15 minutes ]

Secondary Outcome Measures:
  • Retinal venous diameters (Zeiss retinal vessel analyzer) [ Time Frame: 5 minutes ]
  • Retinal blood velocity (laser Doppler velocimetry) [ Time Frame: 10 minutes ]

Enrollment: 12
Study Start Date: September 2010
Study Completion Date: January 2012
Primary Completion Date: December 2011 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: 1
12 healthy male subjects
Other: 100% Oxygen
100% Oxygen- breathing over 30 minutes

  Eligibility

Information from the National Library of Medicine

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Ages Eligible for Study:   19 Years to 35 Years   (Adult)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   Yes
Criteria

Inclusion Criteria:

  • Men aged between 19 and 35 years, nonsmokers
  • Normal findings in the medical history and physical examination unless the investigator considers an abnormality to be clinically irrelevant
  • Normal ophthalmic findings, ametropia < 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 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
  • Ametropia equal or over 3 dpt
  Contacts and Locations
Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00431600


Locations
Austria
Department of Clinical Pharmacology
Vienna, Austria, 1090
Sponsors and Collaborators
Medical University of Vienna
Investigators
Principal Investigator: Gerhard Garhoefer, MD Department of Clinical Pharmacology Medical University of Vienna
  More Information

Responsible Party: Gabriele Fuchsjaeger-Mayrl, MD, Department of Clinical Pharmacology, Medical University of Vienna
ClinicalTrials.gov Identifier: NCT00431600     History of Changes
Other Study ID Numbers: OPHT-121103
First Submitted: February 5, 2007
First Posted: February 6, 2007
Last Update Posted: September 21, 2012
Last Verified: July 2008

Keywords provided by Medical University of Vienna:
Regional Blood Flow
Color Doppler Optical Coherence Tomography
CDOCT
Retinal Blood Flow
Hyperoxia
Vasoconstriction
Laser Doppler Velocimetry
Retinal Vessel Analyzer

Additional relevant MeSH terms:
Hyperoxia
Signs and Symptoms, Respiratory
Signs and Symptoms