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The Antioxidant Effect of Routine Vascular Therapy for Normal Tension Glaucoma Patients

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: NCT00465348
Recruitment Status : Withdrawn (investigator withdrew)
First Posted : April 25, 2007
Last Update Posted : October 25, 2012
Information provided by (Responsible Party):
University Hospital, Basel, Switzerland

Brief Summary:
To quantify oxidative stress in circulating leukocytes of normal tension glaucoma patients, prior to and one month after routine vascular therapy.

Condition or disease
Primary Open Angle Glaucoma

Detailed Description:

There are two accepted medical modalities for glaucoma treatment. The first, is a local application of an intraocular pressure (IOP) lowering drug. The second, is the application of systemic drugs to improve vascular regulation. In the present study we would like to investigate whether this systemic form of treatment, in addition to improving blood flow, also reduces systemic oxidative stress.

Vascular dysregulation is one of the major risk factors for glaucoma, in particular for normal tension glaucoma (NTG). In glaucoma patients blood flow is, on average, reduced not only in the eye but also in various other organs of the body, for example in the fingers. Such a systemic dysregulation leads to disturbed autoregulation and thereby to an unstable oxygen supply in the eye.This, in turn, leads to the formation of reactive oxygen species (ROS). These ROS are capable of damaging cells such as white blood cells; this damage, however, is reversible as nature has provided us with mechanisms to repair this damage. This reversible damage brought about by ROS, which is constantly being repaired in our body, is an indication for oxidative stress. Oxidative stress plays an important role in the pathogenesis of glaucoma.

The indications for oxidative stress can be quantified in our laboratory by the method of comet assay also known as single cell gel electrophoresis.

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Study Type : Observational
Actual Enrollment : 0 participants
Observational Model: Case-Only
Time Perspective: Prospective
Official Title: The Antioxidant Effect of Routine Vascular Therapy for Normal Tension Glaucoma Patients
Study Start Date : June 2009
Actual Primary Completion Date : June 2010
Actual Study Completion Date : June 2010

Resource links provided by the National Library of Medicine

Biospecimen Retention:   None Retained

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 65 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population
primary open-angle glaucoma patients

Inclusion Criteria:

For NTG patients:

  • A mean untreated intraocular pressure consistently equal to or below 21mmHg or median intraocular pressure equal to or below 20mmHg on diurnal testing (at least three measurements) with no single measurement greater than 24mmHg
  • Open drainage angles on gonioscopy
  • Typical optic disc damage with glaucomatous cupping and thinning of neuroretinal rim
  • Visual field defect congruent to glaucomatous disc alteration
  • No other pathological findings upon slit-lamp examination and indirect fundoscopy
  • Vasospastic propensity will be assumed if a clear history of frequent cold hands (answering yes to the questions:" Do you always have cold hands, even during the summer time?" and "Do other people tell you that you have cold hands?") is reported.

For healthy subjects:

  • An intraocular pressure < 20 mmHg
  • No history of ocular or systemic disease
  • No history of chronic or current systemic or topical medication, or of drug or alcohol abuse
  • Normal blood pressure (100-140/60-90mm Hg)
  • Best corrected visual acuity above 20/32 in both eyes
  • No pathological findings upon slit-lamp examination and indirect fundoscopy

Exclusion Criteria:


  • Iridocorneal angle extremely narrow with complete or partial closure as determined by gonioscopy
  • Pigmentary dispersion or pseudoexfoliation
  • Evidence for any secondary cause for a glaucomatous optic neuropathy (trauma, steroids, uveitis)
  • History of chronic or recurrent severe inflammatory eye disease (eg. scleritis, uveitis) or clinically significant or progressive retinal disease (eg. diabetic retinopathy)
  • History of ocular trauma or intraocular surgery within the past 6 months
  • History of systemic infection or inflammation within the past 3 months
  • Need for any concomitant medications that may interfere with the evaluation of leukocytes (eg: steroids, immunosuppressives)
  • Patients with a significant history and /or active alcohol or drug abuse (significant is defined as that which may influence results of the study)

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): NCT00465348

Sponsors and Collaborators
University Hospital, Basel, Switzerland
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Study Director: Selim Orgül, MD University Hospital Basel, Eye Clinic
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Responsible Party: University Hospital, Basel, Switzerland Identifier: NCT00465348    
Other Study ID Numbers: 085-Mom-2007
First Posted: April 25, 2007    Key Record Dates
Last Update Posted: October 25, 2012
Last Verified: October 2012
Keywords provided by University Hospital, Basel, Switzerland:
normal tension glaucoma
vascular dysregulation
Additional relevant MeSH terms:
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Glaucoma, Open-Angle
Low Tension Glaucoma
Ocular Hypertension
Eye Diseases
Optic Nerve Diseases