Measurement of Retinal Venous Pressure in Chronic Low-oxygen Environment

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. Identifier: NCT01771770
Recruitment Status : Completed
First Posted : January 18, 2013
Last Update Posted : December 11, 2013
Information provided by (Responsible Party):
University Hospital, Basel, Switzerland

Brief Summary:
The hypothesis is that the pressure in the retinal veins increases from chronic lack of oxygen and leads to decreased blood flow. On the basis of high altitude mountaineering this hypothesis should be verified. At the same time the adaptation capacity of the blood circulation should be analyzed, and a relationship to mountain sickness should be found.

Condition or disease

Detailed Description:
Conduct a field study to describe and quantify the retinal venous pressure (RVP) in healthy volunteers under conditions of controlled chronically reduced ambient pressure and oxygen partial pressure in the mountains. Obtaining indications regarding the adaptation of the retinal vascular system behavior to controlled, long-term hypoxic changes. Comparisons with blood pressure, pulse, oxygen saturation level and the appearance of symptoms of acute mountain sickness are made in order to obtain a better understanding of the development of high altitude illness.

Study Type : Observational
Actual Enrollment : 40 participants
Observational Model: Cohort
Time Perspective: Prospective
Official Title: Measurement of the Retinal Venous Pressure (RVP) Under Conditions of Chronically Reduced Ambient Pressure and Oxygen Partial Pressure (Field Study)
Study Start Date : December 2011
Actual Primary Completion Date : June 2013
Actual Study Completion Date : December 2013

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Oxygen Therapy

Primary Outcome Measures :
  1. Quantify the changes in the retinal venous pressure (RVP). [ Time Frame: 1-2 months ]
    Quantify the changes in the retinal venous pressure (RVP)

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 60 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population
healthy volunteers

Inclusion Criteria:

  • healthy

Exclusion Criteria:

  • eye diseases
  • systemic diseases
  • term medication (except contraceptives)
  • pregnancy
  • allergies to the ingredients Alcain, Tropicamide and Phenylephrine

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 identifier (NCT number): NCT01771770

University of Basel, Dept. of Ophthalmology
Basel, Switzerland, 4031
Sponsors and Collaborators
University Hospital, Basel, Switzerland
Study Director: Josef Flammer, MD University of Basel, Dept. of Ophthalmology

Responsible Party: University Hospital, Basel, Switzerland Identifier: NCT01771770     History of Changes
Other Study ID Numbers: USB-2011-328
First Posted: January 18, 2013    Key Record Dates
Last Update Posted: December 11, 2013
Last Verified: December 2013

Keywords provided by University Hospital, Basel, Switzerland:
retinal venous pressure (RVP)
chronically reduced ambient pressure
oxygen partial pressure
mountain sickness