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Retinal Venous Pressure and ET-1 in Patients With Diabetes Mellitus

This study has been completed.
Information provided by (Responsible Party):
University Hospital, Basel, Switzerland Identifier:
First received: October 24, 2012
Last updated: January 16, 2013
Last verified: January 2013
Measurement of the circulation in patients with diabetes mellitus and establish a link between retinal venous pressure (RVP) and endothelin (ET-1)levels.

Diabetes Mellitus

Study Type: Observational
Study Design: Observational Model: Cohort
Time Perspective: Prospective
Official Title: Measurement of Retinal Venous Pressure and Endothelin-1 in Patients With Diabetes Mellitus

Further study details as provided by University Hospital, Basel, Switzerland:

Primary Outcome Measures:
  • Quantification of retinal venous pressure (RVP) [ Time Frame: 30 minutes ]

Secondary Outcome Measures:
  • Quantification of ET-1 in correlation with RVP [ Time Frame: 30 minutes ]

Enrollment: 20
Study Start Date: August 2011
Study Completion Date: November 2012
Primary Completion Date: September 2012 (Final data collection date for primary outcome measure)
Diabetes patients
Patients with diabetes mellitus type I + II, without diabetic retinopathy

Detailed Description:

Diabetic retinopathy and maculopathy are the main causes of visual loss. Hyperglycemia as the main risk factor of diabetic retinopathy induced damage to retinal capillaries. These in turn lead to hypoxia in the tissue and promote the release of VEGF (vascular endothelial growth factor) , which in turn increases the vascular pathology. Simultaneously, there is an increased expression of endothelin (ET-1). Endothelin increases vascular tone and regulates the micro-and macro-vascular remodeling.

In ocular blood flow perfusion pressure plays an important role. While in healthy eyes a spontaneous retinal venous pulsation is frequently observed, this is significantly less frequent in diseased eyes. An increased venous pressure lowers the ocular perfusion pressure, and increases the transmural pressure. A measurement of the retinal venous pressure and the hormone ET-1 in the blood will give us a better knowledge of the circulatory changes and their relationship to diabetes.


Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
Patients with diabets mellitus type I or II, without diabetic retinopathy

Inclusion Criteria:

  • diabetes mellitus type I or II
  • no diabetic retinopathy

Exclusion Criteria:

  • known diabetic retinopathy
  • acute or chronic inflammation of the eyes
  • narrow angle glaucoma
  • minority
  Contacts and Locations
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Please refer to this study by its identifier: NCT01771835

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
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: University Hospital, Basel, Switzerland Identifier: NCT01771835     History of Changes
Other Study ID Numbers: 089-CYA-2012
Study First Received: October 24, 2012
Last Updated: January 16, 2013

Keywords provided by University Hospital, Basel, Switzerland:
diabetes mellitus
retinal venous pressure

Additional relevant MeSH terms:
Diabetes Mellitus
Glucose Metabolism Disorders
Metabolic Diseases
Endocrine System Diseases processed this record on August 21, 2017