Micropulse 577 nm Laser Photocoagulation Versus Conventional 532 nm Laser Photocoagulation for Diabetic Macular Oedema

Diabetic Macular Edema Clinical Trial

— UMDMO  

Official title:

A Randomized, Controlled Trial Comparing Micropulse 577 nm Laser Photocoagulation And Conventional 532 nm Laser Photocoagulation for Diabetic Macular Oedema

Clinical Trial Details — Status: Recruiting

Administrative data

• NCT number: NCT01045239
• Other study ID #: UMERC001
• Status: Recruiting
• Phase: Phase 2
• First received: January 7, 2010
• Last updated: January 7, 2010
• Start date: October 2009
• Est. completion date: January 2012

Study information

• Verified date: January 2010
• Source: University of Malaya
• Contact: Linda Ong, MBBS
• Phone: +603-79494422
• Email: lindaong[@]hotmail.com
• Is FDA regulated: No
• Health authority: Malaysia: Ministry of Health
• Study type: Interventional

Clinical Trial Summary

The purpose of this study is to determine whether the new micropulse 577 nm yellow laser is a better treatment option compared to the conventional 532 nm green laser for diabetic macular edema.

Description:

Diabetes mellitus (DM) is a serious debilitating and deadly disease causing significant mortality and morbidity globally. Diabetic macular oedema is the most common cause of visual loss in the working population.

In 1985, the Early Treatment Diabetic Retinopathy Study (ETDRS) demonstrated that focal (direct/grid) laser photocoagulation reduces moderate vision loss from diabetic macular oedema (DMO) by 50% or more. However, further studies have shown that photocoagulation can eventually result in complications leading to loss of central vision and decreased colour vision. Thus, many newer laser machines that claim to reduce the rate of complications have been developed over the years.

In this project, we plan to evaluate the usage of the micropulse 577 nm laser, which is a yellow light laser, and compare it to the conventional 532 nm green laser that is widely used. The 577 nm laser has a high affinity for oxyhemoglobin, a slightly lower affinity for melanin and almost no affinity for macular xanthophylls, as shown in the graph below.22,23,24,25 The yellow 577 nm light also scatters very little and does not cause photochemical reactions in the tissues.

The theoretical advantage of using the micropulse 577 nm yellow laser would be the reduced energy requirement to obtain the same results as with green 532 nm. This leads to less retinal toxicity and damage due to reduced absorption by the xanthophylls. Our aim in this project is to observe whether the theoretical advantage translates to a more effective treatment in reality.

Recruitment information / eligibility

• Status: Recruiting
• Enrollment: 100
• Est. completion date: January 2012
• Est. primary completion date: October 2011
• Accepts healthy volunteers: No
• Gender: Both
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

• Diabetes mellitus (type 1 or 2)

• Diabetic macular edema in study eye associated to diabetic retinopathy

• Diffuse macular edema defined as macular thickening determined by biomicroscopy, OCT and/or fluorescein angiography.

• Best corrected visual acuity between 34 (20/200) and 68 letters (20/50).

• Macular thickness greater than 300 mcm on OCT.

Exclusion Criteria:

• Significant renal disease, defined as a history of chronic renal failure requiring dialysis or kidney transplant.

• A condition that, in the opinion of the investigator, would preclude participation in the study (e.g., unstable medical status including blood pressure, cardiovascular disease, and glycemic control).

• Blood pressure > 180/110 (systolic above 180 OR diastolic above 110).

• Subject is expecting to move out of the area of the clinical center to an area not covered by another clinical center during the next 6 months.

The following exclusions apply to the study eye only (i.e., they may be present for the nonstudy eye):

• Macular edema is considered to be due to a cause other than diabetic macular edema.

• Presence of vitreomacular traction.

• Concurrent proliferative diabetic retinopathy.

• An ocular condition is present such that, in the opinion of the investigator, visual acuity loss would not improve from resolution of macular edema (e.g., foveal atrophy, pigment abnormalities, dense subfoveal hard exudates, significant macular ischemia, nonretinal condition).

• An ocular condition is present (other than diabetes) that, in the opinion of the investigator, might affect macular edema or alter visual acuity during the course of the study (e.g., vein occlusion, uveitis epiretinal membrane, or other ocular inflammatory disease, neovascular glaucoma, etc.).

• Substantial cataract that, in the opinion of the investigator, is likely to be decreasing visual acuity by 3 lines or more (i.e., cataract would be reducing acuity to 20/40 or worse if eye was otherwise normal).

• History of treatment for DME at any time in the past 4 months (such as focal/grid macular photocoagulation, intravitreal or peribulbar corticosteroids, anti-VEGF drugs, or any other treatment).

• History of panretinal (scatter) photocoagulation (PRP) prior to enrollment or anticipated to be performed within next 6 months.

• History of major ocular surgery (including vitrectomy, cataract extraction, scleral buckle, any intraocular surgery, etc.) within prior 12 months or anticipated within the next 6 months.

• History of YAG capsulotomy performed within 2 months prior to enrollment.

Study Design

Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Investigator, Outcomes Assessor), Primary Purpose: Treatment

Related Conditions & MeSH terms

• Diabetic Macular Edema
• Edema
• Macular Edema

Intervention

Device:
• Micropulse 577 nm yellow diode laser
Laser administered at beginning of study and may be repeated at 16 weeks if needed
• 532 nm green diode laser
Laser administered at beginning of study and may be repeated at 16 weeks if needed

Locations

Country	Name	City	State
Malaysia	University Malaya Eye Research Centre	Kuala Lumpur

Sponsors (1)

Lead Sponsor	Collaborator
University of Malaya

Country where clinical trial is conducted

Malaysia, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Best corrected visual acuity by logarithm of the minimum angle of resolution (LogMAR)		1 year	No
Secondary	Macular thickness measured by optical coherence tomography (OCT)		12 months	No
Secondary	Photocoagulation scars on fundus photograph		12 months	Yes