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Micropulsed Laser in Patients With Macular Oedema in Retinal Dystrophies

Primary Purpose

Macular Edema, Inherited Retinal Dystrophy, Laser Retinopathy

Status
Recruiting
Phase
Not Applicable
Locations
Italy
Study Type
Interventional
Intervention
subthreshold treatment with micropulsed laser
Sponsored by
Fondazione G.B. Bietti, IRCCS
About
Eligibility
Locations
Arms
Outcomes
Full info

About this trial

This is an interventional treatment trial for Macular Edema focused on measuring Visual Acuity, Retinal Function, IRD, Macular Edema

Eligibility Criteria

18 Years - 80 Years (Adult, Older Adult)All SexesDoes not accept healthy volunteers

Inclusion Criteria: Patients with inherited retinal disease Age between 18 and 80 years Conclusive molecular genetic study for IRD Male or female patient Presence of macular oedema assessed by sd-OCT with reduction ≤ 20% after 3 months of diuretics or draining supplements or 4 months after last anti-VEGF or steroid injection Phakic and pseudophakic patients Central Retinal thickness > 320 microns in men and > 305 microns in women Informed consent freely granted and acquired before the start of the study Participant has the ability to understand and willingness to follow study instructions and is likely to complete all required visits and procedures. Exclusion Criteria: Patients with cataract extraction prior to 6 months Patients with IOP ≥ 20 mmHg Patients with a clinical diagnosis of retinal dystrophy of unproven genetic origin Patients with diabetes Patients with central serous chorioretinosis, retinal vein occlusion, age-related degeneration Patients with current or previous vitreo-retinal pathology or with indication for vitreo-retinal surgical therapy (tractional oedema) Patients with a lack of target fixation at 32 cm Pregnant women

Sites / Locations

  • IRCSS Fondazione G:B:BiettiRecruiting

Arms of the Study

Arm 1

Arm Type

Experimental

Arm Label

inherited retinal dystrophies with macular oedema

Arm Description

Laser treatment will be performed in patients with macular edema in IRD (experimental arm) who: underwent treatment with diuretics or nutritional drainage products for 3 months and subsequent 'wash-out' of one month 17,18 and had no reduction in macular oedema, in terms of central retinal thickness, of at least 20% compared with the initial assessment they have had an intravitreal injection of anti-VEGF or steroids, and after 3 months there is no reduction in central retinal thickness (CRT) of at least 20% compared to the initial assessment have after 3 months a thickness reduction <10% compared to baseline assessment, following initial treatment with micropulsed laser, and may be candidates for repeating treatment; are not eligible for diuretic therapy due to the presence of comorbidities.

Outcomes

Primary Outcome Measures

assessment of significative change in retinal oedema compared to baseline
assessment of central retinal thickness by macular SD-OCT

Secondary Outcome Measures

To study changes in visual acuity between before and after treatment
LogMAr visual acuity values
To study the retinal function in the macular area before and after treatment.
response amplitude density, measured in nV/dg2 and analysed using multifocal electroretinogram, assessing the amplitude in 5 concentric rings centred on the fovea.
To study the retinal perfusion of the macular area by OCT-angiography before and after treatment.
vascular density (expressed as Retinal Vessel Density) before and after treatment, using OCT-angiography

Full Information

First Posted
July 19, 2023
Last Updated
September 12, 2023
Sponsor
Fondazione G.B. Bietti, IRCCS
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1. Study Identification

Unique Protocol Identification Number
NCT05976139
Brief Title
Micropulsed Laser in Patients With Macular Oedema in Retinal Dystrophies
Official Title
Treatment of Macular Oedema in Patients With Hereditary Retinal Dystrophies by Applying the Micropulsed Subthreshold Laser
Study Type
Interventional

2. Study Status

Record Verification Date
July 2023
Overall Recruitment Status
Recruiting
Study Start Date
September 6, 2023 (Actual)
Primary Completion Date
July 30, 2025 (Anticipated)
Study Completion Date
July 30, 2025 (Anticipated)

3. Sponsor/Collaborators

Responsible Party, by Official Title
Principal Investigator
Name of the Sponsor
Fondazione G.B. Bietti, IRCCS

4. Oversight

Studies a U.S. FDA-regulated Drug Product
No
Studies a U.S. FDA-regulated Device Product
No

5. Study Description

Brief Summary
The purpose of this study is to investigate whether subthreshold treatment with micropulsed laser can be effective in resolving macular edema in patients with inherited retinal dystrophy. Visits will be performed after 1, 3, 6, 9, 12, 18, and 24 months after treatment. Laser treatment will be performed on the day of the first visit, and its repetition at subsequent visits between months 3 and 12 will be evaluated. Evaluations of treatment effects will include: comprehensive ophthalmologic examination multifocal electroretinogram OCT examination OCT-angiography examination retinography Primary endpoint. - central retinal thickness, measured by OCT
Detailed Description
BACKGROUND: Degenerative diseases of the visual system classified as rare and, in particular, those affecting the retina (known as Inherited retinal dystrophies, IRDs) cause very severe functional deficits. Their onset is in many cases particularly early with a consequent visual impact of extreme severity. They constitute a heterogeneous group from a clinical point of view, but in all of them the loss of photoreceptors causes progressive vision loss that can result in complete blindness. These pathologies can be complicated by the presence of cataracts, epiretinal membrane and macular oedema (10-50%), resulting in a worsening of visual acuity. While surgical treatment is applicable for the first two complications, the treatment of macular oedema can make use of several options. Oral or topical diuretics (Acetazolamide) are still the first therapeutic approach and, if oedema persists despite treatment, intravitreal corticosteroid injection has been used in various reports. The injection of anti-Vascular Endothelial Growth Factor (VEGF) drugs and vitrectomy have also been proposed but with conflicting results. The use of topical non-steroidal drugs has been studied and proven to be valuable, although inferior to diuretic treatment in terms of visual recovery. The use of intravitreal corticosteroids is also not without possible further complications such as ocular hypertension and early onset of cataracts. Despite some improvement in retinal oedema by taking the above-mentioned diuretics, relapses can be observed at the end of therapy, reason for taking longer periods (>12 weeks) of therapy. However, the same chronic continuation of diuretic therapy is not always desirable considering its possible adverse events such as tingling sensation, malaise, altered taste sensation and gastrointestinal disorders. RATIONALE: The application of the micropulsed subthreshold retinal laser to reduce retinal oedema in various diseases (diabetic oedema, central serous chorioretinopathy, age-related macular degeneration and retinal vein occlusion) has recently gained wide acceptance. Retinal threshold refers to the tendency of the laser to cause tissue bleaching resulting in retinal cell death, the term sub-threshold implies that the laser uses such a small amount of energy that it does not cause irreversible damage to retinal structures. The term 'micropulsed' derives from the fact that the laser does not use a continuous wave but has a sub-100% duty cycle and the use of 'off' times is what distinguishes this type of laser from conventional lasers and allows the tissue to cool down, preventing laser-induced retinal damage. The main characteristics of this type of laser are therefore that it does not cause visible retinal damage and that it has therapeutic effects. One theory of how this type of laser works is through the action of the molecular protective mechanisms of the Heat Shock Protein (Hsp) family in the retina, including protein chaperone activity, stabilisation of the cytoskeleton and prevention of apoptosis mainly through inhibition of cytochrome C release through the phenomenon of 'resetting'. Another theory hypothesized the activation of leucocyte recruitment or remodeling of the extracellular matrix in the choroid and retina. Possible mechanisms of increased trophic factors (CNTF and FGF-2)14 and up-regulation of other factors (MMP-2, MMP-3, TNFα and Nos2) are covered. TRIAL DESIGN: Prospective, interventional, single-centre, open-label study involving consecutive enrolment (see sample size in section "Statistics") of patients with macular oedema in retinal dystrophies. Each patient referred to the Outpatient Clinical and Research Center of Neuro-ophthalmology and Genetic and Rare Diseases with IRD and macular oedema treated for 3 months with diuretics and draining food supplements and without improvement of macular oedema or increase of the same (reduction of post-therapy CRT ≤20% compared to pre-therapy CRT) will be duly informed about the therapeutic option of this study protocol. After verification of the criteria for inclusion in the study and after signing of the informed consent, the patient will be considered eligible for treatment with micropulsed laser by the physicians of the Clinical and Research Center of Neuro-ophthalmology and Genetic and Rare Diseases and Medical Retina. The patient enrolled in the study will be clinically analysed with the instrumentation indicated below at regular intervals (screening/baseline, follow-up 1 [FU1] (1 month), FU2 (3 months), FU3 (6 months), FU4 (9 months), FU5 (12 months), FU6 (18 months) and FU7 (24 months).

6. Conditions and Keywords

Primary Disease or Condition Being Studied in the Trial, or the Focus of the Study
Macular Edema, Inherited Retinal Dystrophy, Laser Retinopathy
Keywords
Visual Acuity, Retinal Function, IRD, Macular Edema

7. Study Design

Primary Purpose
Treatment
Study Phase
Not Applicable
Interventional Study Model
Sequential Assignment
Masking
None (Open Label)
Masking Description
no masking
Allocation
N/A
Enrollment
10 (Anticipated)

8. Arms, Groups, and Interventions

Arm Title
inherited retinal dystrophies with macular oedema
Arm Type
Experimental
Arm Description
Laser treatment will be performed in patients with macular edema in IRD (experimental arm) who: underwent treatment with diuretics or nutritional drainage products for 3 months and subsequent 'wash-out' of one month 17,18 and had no reduction in macular oedema, in terms of central retinal thickness, of at least 20% compared with the initial assessment they have had an intravitreal injection of anti-VEGF or steroids, and after 3 months there is no reduction in central retinal thickness (CRT) of at least 20% compared to the initial assessment have after 3 months a thickness reduction <10% compared to baseline assessment, following initial treatment with micropulsed laser, and may be candidates for repeating treatment; are not eligible for diuretic therapy due to the presence of comorbidities.
Intervention Type
Device
Intervention Name(s)
subthreshold treatment with micropulsed laser
Intervention Description
The laser instrument used is the Q 577® Laser System, Iridex, wavelength 577 yellow. The standard pattern used is: Power: 5% Duty Cycle Power 250 mw Pulse duration 200 ms Spot size 100 micron Pattern spacing 0.0 confluente, griglie 7x7
Primary Outcome Measure Information:
Title
assessment of significative change in retinal oedema compared to baseline
Description
assessment of central retinal thickness by macular SD-OCT
Time Frame
up to 24 months
Secondary Outcome Measure Information:
Title
To study changes in visual acuity between before and after treatment
Description
LogMAr visual acuity values
Time Frame
up to 24 months
Title
To study the retinal function in the macular area before and after treatment.
Description
response amplitude density, measured in nV/dg2 and analysed using multifocal electroretinogram, assessing the amplitude in 5 concentric rings centred on the fovea.
Time Frame
up to 24 months
Title
To study the retinal perfusion of the macular area by OCT-angiography before and after treatment.
Description
vascular density (expressed as Retinal Vessel Density) before and after treatment, using OCT-angiography
Time Frame
up to 24 months

10. Eligibility

Sex
All
Minimum Age & Unit of Time
18 Years
Maximum Age & Unit of Time
80 Years
Accepts Healthy Volunteers
No
Eligibility Criteria
Inclusion Criteria: Patients with inherited retinal disease Age between 18 and 80 years Conclusive molecular genetic study for IRD Male or female patient Presence of macular oedema assessed by sd-OCT with reduction ≤ 20% after 3 months of diuretics or draining supplements or 4 months after last anti-VEGF or steroid injection Phakic and pseudophakic patients Central Retinal thickness > 320 microns in men and > 305 microns in women Informed consent freely granted and acquired before the start of the study Participant has the ability to understand and willingness to follow study instructions and is likely to complete all required visits and procedures. Exclusion Criteria: Patients with cataract extraction prior to 6 months Patients with IOP ≥ 20 mmHg Patients with a clinical diagnosis of retinal dystrophy of unproven genetic origin Patients with diabetes Patients with central serous chorioretinosis, retinal vein occlusion, age-related degeneration Patients with current or previous vitreo-retinal pathology or with indication for vitreo-retinal surgical therapy (tractional oedema) Patients with a lack of target fixation at 32 cm Pregnant women
Central Contact Person:
First Name & Middle Initial & Last Name or Official Title & Degree
Lucia Ziccardi, MD, PhD
Phone
+390684009486
Email
neuger@fondazionebietti.it
First Name & Middle Initial & Last Name or Official Title & Degree
Federica Petrocchi, Orthoptist
Phone
+390684009486
Email
neuger@fondazionebietti.it
Overall Study Officials:
First Name & Middle Initial & Last Name & Degree
Lucia Ziccardi, MD, PhD
Organizational Affiliation
IRCCS Fondazione G.B. Bietti
Official's Role
Principal Investigator
Facility Information:
Facility Name
IRCSS Fondazione G:B:Bietti
City
Rome
State/Province
RM
ZIP/Postal Code
00194
Country
Italy
Individual Site Status
Recruiting
Facility Contact:
First Name & Middle Initial & Last Name & Degree
Lucia Ziccardi, MD, PhD
Phone
+390684009486
Email
neuger@fondazionebietti.it
First Name & Middle Initial & Last Name & Degree
Federica Petrocchi, Orthoptist
Phone
+390684009486
Email
neuger@fondazionebietti.it
First Name & Middle Initial & Last Name & Degree
Lucilla Barbano
First Name & Middle Initial & Last Name & Degree
Mariacristina Parravano
First Name & Middle Initial & Last Name & Degree
Lucia Ziccardi

12. IPD Sharing Statement

Plan to Share IPD
Yes
IPD Sharing Plan Description
At the end of the research, within 6 months after the end of the study, a Final Clinical Report of the study containing clinical comments based on the data generated by the statistical processing will be prepared by the Investigator and/or delegated person. This report will be structured as an &#34;integrated statistical clinical report&#34; containing the clinical comments based on the data generated by the statistical report.
IPD Sharing Time Frame
Six months after the end of the study
IPD Sharing Access Criteria
On demand
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Links:
URL
https://www.retinalphysician.com/issues/2017/october-2017/hereditary-retinal-degenerations-and-cystoid-macul
Description
Hereditary Retinal Degenerations and Cystoid Macular Edema
URL
https://pubmed.ncbi.nlm.nih.gov/26697211/
Description
Photothermal Stimulation with a Micropulse Laser
URL
https://www.ncbi.nlm.nih.gov/books/NBK564379/
Description
Retinal Distrophies

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Micropulsed Laser in Patients With Macular Oedema in Retinal Dystrophies

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