A New View of Normal Tension Glaucoma: Autoregulation and Systemic Blood Pressure

The recruitment status of this study is unknown because the information has not been verified recently.
Verified January 2011 by Weill Medical College of Cornell University.
Recruitment status was  Recruiting
Sponsor:
Information provided by:
Weill Medical College of Cornell University
ClinicalTrials.gov Identifier:
NCT00706056
First received: June 25, 2008
Last updated: January 3, 2011
Last verified: January 2011
  Purpose

Glaucoma is an eye disease that leads to damage of the optic nerve, visual field loss and can progress to blindness. Traditionally, glaucoma and its treatment have been closely linked to intraocular pressures. In normal tension glaucoma, damage to the optic nerve occurs without any increase in intraocular pressure. Normal tension glaucoma most often occurs in the elderly and can lead to loss of sight and significant disability. Subjects with progressive visual field loss are often a highly motivated group of subjects, ready to take an active part in the treatment of their condition. Investigating the risk factors that contribute to the development of normal-tension glaucoma may shed light on the progression of the disease.

The objective of this study is to determine whether systemic blood pressure in the body is related to the development and progression of normal tension glaucoma in the eye. The study aims to clarify whether subjects with episodes of hypotension (low blood pressure) at night are at increased risk for sight loss and the development of normal tension glaucoma.

Subjects with normal tension glaucoma will have their demographic and clinical characteristics recorded and their eyes examined at baseline, 6-months and 12 months. Subjects will wear an external blood pressure cuff for 48 hours that will record blood pressure every 30 minutes. This same blood pressure recording procedure will be performed at baseline, at 6 months, and at 12 months. At these same time intervals, visual fields will also be measured, as per routine clinical care, by the treating ophthalmologist. The results of the visual field testing will be recorded. The primary outcome of the study will be visual field abnormalities and their relationship to dips in systemic blood pressure. Results will be published and will be used as a base for future projects that may impact treatment and the understanding of risk factors of normal tension glaucoma.


Condition
Normal Tension Glaucoma

Study Type: Observational
Study Design: Observational Model: Cohort
Time Perspective: Prospective
Official Title: A New View of Normal Tension Glaucoma: Autoregulation and Systemic Blood Pressure

Resource links provided by NLM:


Further study details as provided by Weill Medical College of Cornell University:

Primary Outcome Measures:
  • The primary outcome of the study will be visual field abnormalities and their relationship to dips in systemic blood pressure. [ Time Frame: baseline, 6-months and 12-months ] [ Designated as safety issue: No ]

Estimated Enrollment: 85
Study Start Date: September 2008
Estimated Study Completion Date: January 2011
Groups/Cohorts
1
Patients with Normal-Tension Glaucoma

  Eligibility

Ages Eligible for Study:   21 Years and older
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population

Patients with Normal Tension Glaucoma

Criteria

Inclusion Criteria:

  1. The IOP must be less than or equal to 21 mmHg without treatment and must have never been higher than 24 mmHg, without treatment.
  2. Gonioscopically open angles.
  3. Typical glaucomatous optic disc changes, including: rim thinning, cupping, rim notching, disc hemorrhage, nerve fiber layer defect, vertical cup/disc asymmetry ≥0.2.
  4. A reproducible visual field defect must have been demonstrated on at least three prior visual fields, as observed using standard automated perimetry with Swedish Interactive Threshold Algorithm (SITA-STANDARD) from the Humphrey Visual Field Analyzer using the 24-2 test pattern.
  5. There must have been progression of glaucomatous loss with the past 36 months, specifically, two or more adjacent non-peripheral points changed by 10dB relative to the average baseline value for the points, confirmed by two subsequent fields.

Exclusion Criteria:

  1. Subjects with a visual field defect attributable to conditions other than glaucoma, such as a history of intra-cranial or ENT mass lesion.
  2. Occludable narrow angles.
  3. Subjects with intermittent elevation of intraocular pressure associated with another form of glaucoma, including intermittent angle closure, inflammatory glaucoma, old pigmentary glaucoma, psedoexfoliation or uveitis.
  4. Subjects who cannot complete follow-up testing every six months for any reason.
  5. Subjects who are unable to provide informed consent or who refuse or whose physicians do not wish for the subjects to participate for any reason.
  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: NCT00706056

Contacts
Contact: Kathryn A Boschert, MS 212-746-1607 kab2021@med.cornell.edu

Locations
United States, New York
Glaucoma Associates of New York/New York Eye and Ear Infirmary Recruiting
New York, New York, United States, 10003
Principal Investigator: Robert Ritch, MD         
Principal Investigator: Jeffrey Liebmann, MD         
The New York Presbyterian Hospital-Weill Medical Center Enrolling by invitation
New York, New York, United States, 10065
Sponsors and Collaborators
Weill Medical College of Cornell University
Investigators
Principal Investigator: Mary E. Charlson, MD Weill Medical College of Cornell University
  More Information

No publications provided

Responsible Party: Mary E. Charlson, MD, Weill Cornell Medical College
ClinicalTrials.gov Identifier: NCT00706056     History of Changes
Other Study ID Numbers: 0712009565
Study First Received: June 25, 2008
Last Updated: January 3, 2011
Health Authority: United States: Federal Government
United States: Institutional Review Board

Additional relevant MeSH terms:
Glaucoma
Low Tension Glaucoma
Ocular Hypertension
Eye Diseases
Optic Nerve Diseases

ClinicalTrials.gov processed this record on September 15, 2014