Retinal Nerve Fiber Layer Thickness Changes in Parkinson Disease: A Meta-analysis

July 16, 2014 updated by: Yifan Feng
Optical coherence tomography (OCT) is a non-invasive retinal imaging technology that can provide high-resolution cross-sectional images of the peripapillary retinal nerve fiber layer (RNFL) and measure its thickness. A reduction of the RNFL thickness has been detected in several neurodegenerative diseases, such as multiple sclerosis, CADASIL and Alzheimer's disease. Different studies have reported RNFL changes also in Parkinson's disease (PD),a common neurodegenerative disease characterized by motor dysfunctions, originally described by James Parkinson in 1817. PD is characterized by selective dopaminergic neuronal cells loss, which may correlate with RNFL thinning. Previous studies on this subject, however, reported contradicting results. Some investigations reported reductions of the RNFL thickness while others did not. In the present study, in order to determine whether RNFL thickness is reduced in PD patients, we performed a meta-analysis and systematically evaluated RNFL thickness measurements with OCT in a series of PD patients and in the healthy control groups.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Observational

Enrollment (Actual)

500

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

  • China
    • Zhejiang
      • Wenzhou, Zhejiang, China, 325000
        • Wenzhou Medical College

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 to 80 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Sampling Method

Probability Sample

Study Population

PD patients and healthy subjects were included and underwent OCT examinations

Description

Inclusion Criteria:

  1. case-control studies;
  2. patients with PD were compared with healthy controls;
  3. all subjects underwent RNFL thickness measurement by OCT;
  4. studies should provide the data of peripapillary RNFL thickness;
  5. sample size ≥10 in each group.

Exclusion Criteria:

  1. authors did not make RNFL measurements;
  2. study without healthy control group;
  3. the outcome values can not be used for meta-analysis;
  4. duplicated articles.

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

  • Observational Models: Case-Control
  • Time Perspectives: Retrospective

Cohorts and Interventions

Group / Cohort
Intervention / Treatment
healthy control
Sex- and agematched healthy subjects
Device: Optical coherence tomography
Parkinson group
Patients with Parkinson's disease
Device: Optical coherence tomography

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Retinal Nerve Fiber Layer Thickness
Time Frame: Baseline
Retinal nerve fiber layer thickness included average thickness (360° measurement), temporal quadrant thickness (316-45°), superior quadrant thickness (46-135°), nasal quadrant thickness (136-225°) and inferior quadrant thickness (226-315°)was measured by OCT.
Baseline

Collaborators and Investigators

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

Sponsor

Yifan Feng

Collaborators

Wenzhou Medical University

Investigators

  • Principal Investigator: Yifan Feng, PhD, Wenzhou Medical University

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

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

August 1, 2013

Primary Completion (Actual)

January 1, 2014

Study Completion (Actual)

May 1, 2014

Study Registration Dates

First Submitted

August 20, 2013

First Submitted That Met QC Criteria

August 22, 2013

First Posted (Estimate)

August 23, 2013

Study Record Updates

Last Update Posted (Estimate)

July 18, 2014

Last Update Submitted That Met QC Criteria

July 16, 2014

Last Verified

July 1, 2014

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • FYF20130820

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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