Impact of Oral Versatile Antioxidants on Glaucoma Progression - Full Text View

Purpose

Background: The significance of retinal ganglion cell protection in the glaucoma led the view that, glaucomatous optical neuropathy can also be considered as a pathology of central nervous system. It is known that α−tocopherol and Gingko Biloba have specific neuroprotective and vasoregulatory activities, in addition to antioxidant effects. In this study, the investigators compared early neuroprotective effects of α−tocopherol and GB with each other as well as control and a strong antioxidant formulation in patients with glaucoma.

Methods: In this non-randomized control trial, 120 eyes of 60 patients with glaucoma were enrolled into the study and divided into 4 groups, each consisting of 30 eyes. Unlike the controls, patients in the 3 antioxidant groups received α−tocopherol, Gingko Biloba and a strong antioxidant formula for 3 months. Central vision field and MD, PSD and OCT as well as thickness of retinal nerve fiber layer, ganglion cell counts and c/d ratios were recorded. The data were compared statistically.

Condition	Intervention	Phase
Glaucoma	Drug: Gingko Biloba Drug: α−tocopherol Drug: Placebo Drug: Antioxidant formula	Phase 3


Study Type:	Interventional
Study Design:	Allocation: Randomized Endpoint Classification: Efficacy Study Intervention Model: Parallel Assignment Masking: Single Blind (Investigator) Primary Purpose: Prevention
Official Title:	Impact of Oral Versatile Antioxidants on Glaucoma Progression:Comparative Early Results

Resource links provided by NLM:

Genetics Home Reference related topics: early-onset glaucoma

MedlinePlus related topics: Antioxidants Glaucoma Vitamin E

Drug Information available for: alpha-Tocopherol Tocopherol alpha-Tocopherol succinate Tocopherol acetate dl-alpha-Tocopherol Ginkgo biloba

U.S. FDA Resources

Further study details as provided by Bagcilar Training and Research Hospital:

Primary Outcome Measures:

Retinal nerve fiber layer thickness [ Time Frame: 3 months ] [ Designated as safety issue: No ]


Enrollment:	60
Study Start Date:	April 2008
Study Completion Date:	February 2012
Primary Completion Date:	November 2009 (Final data collection date for primary outcome measure)

Arms	Assigned Interventions
Active Comparator: retinal nerve fiber thickness	Drug: Gingko Biloba 2x60 mg Gingko Biloba (Vega Natural, Konya, Turkey) Other Name: Gingko Biloba (Vega Natural, Konya, Turkey) Drug: α−tocopherol 2x300 mg α−tocopherol Other Name: α−tocopherol (Roche Pharma, Istanbul, Turkey) Drug: Placebo control group did not receive oral neuroprotective agent Drug: Antioxidant formula 2x1 tablet AOF Other Name: AOF (Vega Natural, Konya, Turkey)
Active Comparator: Mean Deviation	Drug: Gingko Biloba 2x60 mg Gingko Biloba (Vega Natural, Konya, Turkey) Other Name: Gingko Biloba (Vega Natural, Konya, Turkey) Drug: α−tocopherol 2x300 mg α−tocopherol Other Name: α−tocopherol (Roche Pharma, Istanbul, Turkey) Drug: Placebo control group did not receive oral neuroprotective agent Drug: Antioxidant formula 2x1 tablet AOF Other Name: AOF (Vega Natural, Konya, Turkey)
Active Comparator: Pattern Standard Deviation	Drug: Gingko Biloba 2x60 mg Gingko Biloba (Vega Natural, Konya, Turkey) Other Name: Gingko Biloba (Vega Natural, Konya, Turkey) Drug: α−tocopherol 2x300 mg α−tocopherol Other Name: α−tocopherol (Roche Pharma, Istanbul, Turkey) Drug: Placebo control group did not receive oral neuroprotective agent Drug: Antioxidant formula 2x1 tablet AOF Other Name: AOF (Vega Natural, Konya, Turkey)
Active Comparator: ganglion cell count	Drug: Gingko Biloba 2x60 mg Gingko Biloba (Vega Natural, Konya, Turkey) Other Name: Gingko Biloba (Vega Natural, Konya, Turkey) Drug: α−tocopherol 2x300 mg α−tocopherol Other Name: α−tocopherol (Roche Pharma, Istanbul, Turkey) Drug: Placebo control group did not receive oral neuroprotective agent Drug: Antioxidant formula 2x1 tablet AOF Other Name: AOF (Vega Natural, Konya, Turkey)
Active Comparator: c/d ratios	Drug: Gingko Biloba 2x60 mg Gingko Biloba (Vega Natural, Konya, Turkey) Other Name: Gingko Biloba (Vega Natural, Konya, Turkey) Drug: α−tocopherol 2x300 mg α−tocopherol Other Name: α−tocopherol (Roche Pharma, Istanbul, Turkey) Drug: Placebo control group did not receive oral neuroprotective agent Drug: Antioxidant formula 2x1 tablet AOF Other Name: AOF (Vega Natural, Konya, Turkey)

Detailed Description:

A significant difference was observed between MD, PSD, s-RNFL and m-RNFL levels of groups (p<0.05) (Table 3), but when compared with Groups of Vit E and AOF, MD and s-RNFL levels of the Group GB were significantly low and PSD level was significantly high in the same group. m-RNFL level of the Vit E group was significantly higher than m-RNFL levels of GB, AOF and Control groups (p<0.05, p<0.01). In the comparison of Vitamin E with GB, MD values were found significantly higher and PSD values were significantly low (p<0.05). No statistically significant difference was present between I-RNFL levels of groups (p>0.05). While the difference between c/d levels of groups were highly significant (p<0.01) (Table 3), c/d levels of Vit E and GB groups were found significantly lower than c/d levels of AOF and Control groups (p<0.01). c/d level of the Vit E group is significantly lower than c/d levels of AOF and Control groups (p<0.01). No statistically significant difference was found between c/d levels of other groups (p>0.05).

No statistically significant difference was present between s-GCC and i-GCC levels of groups (p>0.05). A high statistically significant difference was found between m-GCC levels of groups (p<0.01). While highly 201 significant and significant difference were present between m-GCC level of the Vit E Group and m-GCC levels of AOF and Control Groups, respectively, (p<0.01, p<0.05), m-GCC level of the Group GB was significantly higher than that of Group AOF (p<0.05). No statistically significant difference was observed between m-GCC levels of other groups (p>0.05).

Eligibility


Ages Eligible for Study:	18 Years to 67 Years (Adult, Senior)
Genders Eligible for Study:	Both
Accepts Healthy Volunteers:	No

Criteria

Inclusion Criteria:

Patients who received follow-up in our glaucoma polyclinics

Exclusion Criteria:

Known ocular or systemic concomitant disorders
Previous glaucoma surgeries
Antioxidant usage

Contacts and Locations

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT01544192

Locations


Turkey
Bakırköy Şadi Konuk Training and Research Hospital
Istanbul, Turkey, 34147

Sponsors and Collaborators

Bagcilar Training and Research Hospital

Investigators


Study Director:	Kaya N Engin, MD,PhD	Bagcilar TRH

More Information


Responsible Party:	Bagcilar Training and Research Hospital
ClinicalTrials.gov Identifier:	NCT01544192 History of Changes
Other Study ID Numbers:	BEAH-Ophthalmol-1
Study First Received:	October 19, 2011
Last Updated:	March 2, 2012
Health Authority:	Turkey: Ministry of Health

Keywords provided by Bagcilar Training and Research Hospital:


Antioxidant α−tocopherol Vitamin E Gingko Biloba	Glaucoma Neuroprotection Retina

Additional relevant MeSH terms:


Glaucoma Ocular Hypertension Eye Diseases Antioxidants Tocopherols Vitamin E Tocotrienols	Alpha-Tocopherol Molecular Mechanisms of Pharmacological Action Protective Agents Physiological Effects of Drugs Vitamins Micronutrients Growth Substances

ClinicalTrials.gov processed this record on September 23, 2016