Primary Open Angle Glaucoma
Conditions
Keywords
normal tension glaucoma, vascular dysregulation
Brief summary
To quantify oxidative stress in circulating leukocytes of normal tension glaucoma patients, prior to and one month after routine vascular therapy.
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.
Interventions
None listed
Sponsors
University Hospital, Basel, Switzerland
Study design
Observational model
CASE_ONLY
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to 65 Years
Healthy volunteers
Yes
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
Outcome results
None listed