Clinical Study of the Effect of Intravenous Galactose on Diabetic Macular Oedema

June 25, 2007 updated by: Glostrup University Hospital, Copenhagen

Diabetic Macular Oedema: Quantification of the Effect of Rising the Intracapillary Osmotic Pressure With Intravenous Galactose on the Retinal Thickness

The purpose of the present study is to examine, if retinal swelling in diabetic patients can be reduced by an intravenous injection of galactose.

Study Overview

Status

Terminated

Conditions

Intervention / Treatment

Detailed Description

Macular oedema (swelling of the retina) is a leading cause of severe visual loss and blindness in patients with diabetes. The oedema is caused by fluid accumulation in the retinal tissue from leaking capillaries and leads to an increase in the retinal thickness. Optical Coherence Tomography (OCT) has become the primary technique to estimate the retinal thickness objectively, and the scans can be performed without any discomfort to the patient after dilation of the pupils.

According to the Starling equation, a general basic physiologic rule, specific factors influence the fluid transport between the capillaries and the surrounding tissue. One of these factors is the balance between the large molecules within the vessel lumen and the surrounding tissue, e.g. the osmotic pressure balance. By changing the osmotic balance some drugs can reduce the fluid content in the tissue by extracting water from the tissue to the vessel lumen. Such a drug is galactose.

In the present study we examine, if treatment with intravenous galactose can reduce the retinal thickness in diabetic macular oedema evaluated by OCT during a three-hour monitoring. Galactose (0.5 mg/mL) is administered as 1 mL galactose per kg body weight + 10% with a maximum of 80 mL, and injection time is 5 min. If reduction of the thickness with galactose is found, it then confirms the application of the Starling osmotic forces on diabetic macular oedema. In the same time span series of venous blood samples are taken for analysis of plasma osmolarity and electrolytes. The systemic blood pressure is also monitored as well as the capillary glucose level.

As diurnal variations in the retinal thickness estimates potentially can influence the results, the OCT measurements and blood samples are repeated on a second day for each participant, without treatment with galactose for comparison. The order of two visits is given by randomisation.

Interim analysis will take place after inclusion of 15 to 20 patients to evaluate the need for inclusion of 45 patients.

Study Type

Interventional

Enrollment (Actual)

1

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 Locations

  • Denmark
      • Glostrup, Denmark, DK-2600
        • Department of Ophthalmology, Glostrup Hospital, University of Copenhagen, Nordre Ringvej 57,

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 and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Type 1 or type 2 diabetes
  • clinically significant macular oedema
  • visual acuity of minimum 40 letters by the ETDRS procedure
  • retinal thickness of at least 250 microns in the foveal region on three retinal maps of the fast protocol of the StratusOCT at baseline or at least 300 microns outside the foveal region
  • 1 disc area of oedema within 3000 microns from the foveal center on three retinal maps of the fast protocol of the StratusOCT at baseline
  • maximal blood pressure 160/90 mmHg (mean of three measurements)
  • informed consent

Exclusion Criteria:

  • other ocular diseases or treatments, that can cause or influence the macular oedema, including prior laser photocoagulation. Traction oedema is allowed.
  • glaucoma
  • media opacities that significantly impairs the light reflection while scanning
  • Pregnancy
  • severe heart, lung and/or renal insufficiency (judged by the primary investigator)

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: Treatment
  • Allocation: Randomized
  • Interventional Model: Crossover Assignment
  • Masking: None (Open Label)

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Retinal thickness estimated by the fast protocol of the StratusOCT (0, 2, 4, 8, 10, 15, 20, 30, 60, 90, 120 and 180 min).
Time Frame: three hours
three hours

Secondary Outcome Measures

Outcome Measure
Time Frame
Side effects during the three-hour examination period, to evaluate if caused by galactose per se or by an increase in intracapillary osmotic pressure.
Time Frame: Three hours
Three hours

Collaborators and Investigators

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

Sponsor

Glostrup University Hospital, Copenhagen

Investigators

  • Principal Investigator: Dorte Nellemann Thornit, MD, Department of Ophthalmology, Glostrup Hospital, University of Copenhagen, Nordre Ringvej 57, DK-2600 Glostrup, Denmark

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

January 1, 2007

Study Completion (Actual)

March 1, 2007

Study Registration Dates

First Submitted

January 25, 2007

First Submitted That Met QC Criteria

January 25, 2007

First Posted (Estimate)

January 29, 2007

Study Record Updates

Last Update Posted (Estimate)

June 26, 2007

Last Update Submitted That Met QC Criteria

June 25, 2007

Last Verified

June 1, 2007

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • Dorte Nellemann, galactose

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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