Management of Retinitis Pigmentosa Via Electromagnetic Stimulation and Platelet Rich Plasma (rEMS)

February 1, 2020 updated by: Umut Arslan, Ankara Universitesi Teknokent

Management of Retinitis Pigmentosa Via Repetitive Electromagnetic Stimulation and Autologous Platelet Rich Plasma

The aim of this study is to investigate whether natural progression rate can be slowed down with subtenon PRP or PRP application combined with rEMS in retinitis pigmentosa cases.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

Retinitis pigmentosa (RP) is a progressive external retinal degeneration resulting from mutation in any of the 260 genes found in the retinal pigment epithelium (RPE). The progression rate and findings of the disease are heterogeneous according to genetic mutation and heredity type. The initial symptom of the disease is usually night blindness (nyctalopia) beginning in childhood or adolescent period. Narrowing in the visual field and legal blindness develops as the disease progresses. If low grade inflammation is added, the disease is complicated by cataracts, epiretinal membrane and macular edema. In the fundus examination, the appearance of midperiferal bone spicule pigmentation is usually sufficient to diagnosis. Developments in optical coherence tomography (OCT) technology enable detailed imaging of the sensorial retina and the ellipsoid zone. The ellipsoid zone (EZ) is an image of the inner and outer segments of photoreceptor cells. Loss of EZ is considered the gold standard in the diagnosis and follow-up of RP. Visual field monitoring and electroretinography (ERG) are indirect signs of EZ loss and correlated with EZ width. Mutations in RPE disrupt the synthesis of some vital peptide and growth factors for photoreceptors.

Platelet-rich plasma (PRP) is a good source of growth factors. Platelets have more than 30 growth factors and cytokines in α-granules such as neurotrophic growth factor (NGF), neural factor (NF), brain derived neurotrophic factor (BDNF), basic fibroblast growth factor (bFGF), insulin-like growth factor (IGF), transforming growth factor (TGF-β), vascular endothelial growth factor (VEGF), platelet derived growth factor (PDGF) etc. These peptides regulate the energy cycle at the cellular level, local capillary blood flow, neurogenesis and cellular metabolism. Anti-inflammatory effects of PRP are also associated with soluble cytokines.

Repetitive electromagnetic stimulation (rEMS), increases binding affinity and the synthesis of growth factor receptors on neural tissues. It provides electromagnetic iontophoresis by changing the electrical charges of tyrosine kinase receptors (Trk). rEMS forms hyperpolarization-depolarization waves in neurons, thereby increasing neurotransmission and capillary blood flow. Trk receptors are commonly found around limbus, extraocular muscle insertions and the optic nerve. Molecules smaller than 75 kD can pass from the sclera passively to the suprachoroidal space. Electrical or electromagnetic iontophoresis is required for molecules larger than 75kD such as BDNF and IGF to pass through the sclera.

The aim of this study is to investigate whether natural progression rate can be slowed down with subtenon PRP or PRP application combined with rEMS in retinitis pigmentosa cases.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
60

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Not Applicable

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

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years to 60 years (Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • RP patients in any phenotype with vision over 50 letters

Exclusion Criteria:

  • Media opacity and nystagmus presence to prevent EZW imaging in OCT

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

  • Primary Purpose: Treatment
  • Allocation: Non-Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Active Comparator: Repetitive electromagnetic stimulation
Group 1 consists of 20 RP patients (40 eyes) who received combined rEMS with PRP. In this group, patients received rEMS for 30 minutes before subtenon PRP injections. In this group, 3 loading doses were applied at 3-week intervals. Then 2 booster dose were applied at 6-month intervals.
Combination product: PRP combined Magnovision
The rEMS helmet is used to stimulate the retina and visual pathways. (MagnovisionTM) combined with subtenon platelet rich plasma injection
Biological: PRP
Fresh autologous platelet rich plasma, injected subtenon space.
Active Comparator: Platelet rich plasma
Group 2 consists of 20 RP patients (40 eyes). In this group, patients received only subtenon PRP injections. In this group, 3 loading doses were applied at 3-week intervals. Then 2 booster dose were applied at 6-month intervals.
Biological: PRP
Fresh autologous platelet rich plasma, injected subtenon space.
No Intervention: Natural course
Group 3 consists of 20 RP patients (40 eyes). Patients in this group did not accept any interventional application and were only followed up. The

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Ellipsoid zone width (EZW)
Time Frame: Change from baseline EZW at 12 months
The ellipsoid zone (EZ) is an image of the inner and outer segments of photoreceptor cells on OCT view
Change from baseline EZW at 12 months

Collaborators and Investigators

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

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Ankara Universitesi Teknokent

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Umut Arslan, MD, Ankara Universitesi Teknokent

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 (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
January 1, 2017

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
December 30, 2019

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
December 30, 2019

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
January 31, 2020

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
January 31, 2020

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
February 5, 2020

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
February 5, 2020

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
February 1, 2020

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
February 1, 2020

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 19-1293-18

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

No

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

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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