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Micropulse 810 Nanomolar (nm), Diode Laser for Diffuse Diabetic Macular Edema

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified May 2008 by Federal University of São Paulo.
Recruitment status was:  Recruiting
Information provided by:
Federal University of São Paulo Identifier:
First received: October 31, 2007
Last updated: May 6, 2008
Last verified: May 2008

Objective: To compare micropulse 810nm diode laser photocoagulation versus argon laser photocoagulation for treatment of diabetic macular edema. Micropulse laser technique will be determined by an initial clinical trial comparing single versus double density laser photocoagulation techniques for treatment of diabetic macular edema.The single density is based on the Early Treatment Diabetic Retinopathy Study (ETDRS) grid photocoagulation technique and the double density increases the number of spots.

Methods: Patients with diabetic macular edema will be assigned to receive either micropulse 810nm diode laser photocoagulation or argon laser photocoagulation therapy. First, in a smaller clinical trial, patients will be assigned to single or double density micropulse 810nm diode laser to determine best strategy for this therapy. Visual acuity, fundus photographs and fluorescein angiography, and optical coherence tomography measurements , autofluorescence and mfERG were obtained at baseline and at 1, 3 and 6 months and 12 months.

Condition Intervention Phase
Diabetic Macular Edema
Device: Laser photocoagulation
Phase 2

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single Blind (Participant)
Primary Purpose: Treatment
Official Title: Phase 2 Study of Micropulse 810nm Diode Laser Photocoagulation for Treatment of Diffuse Diabetic Macular Edema

Resource links provided by NLM:

Further study details as provided by Federal University of São Paulo:

Primary Outcome Measures:
  • Macular thickness measured by optical coherence tomography (OCT) [ Time Frame: 12 months ]

Secondary Outcome Measures:
  • Safety profile [ Time Frame: 12 months ]
  • Selectivity of laser therapy (autofluorescence and mfERG) [ Time Frame: 12 months ]

Estimated Enrollment: 50
Study Start Date: March 2007
Estimated Study Completion Date: November 2008
Estimated Primary Completion Date: November 2008 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: 1
Micropulse 810nm diode laser
Device: Laser photocoagulation
Laser therapy is applied using a slit lamp and specific laser contact lens.
Active Comparator: 2
Argon laser photocoagulation
Device: Laser photocoagulation
Laser therapy is applied using a slit lamp and specific laser contact lens.


Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

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 and 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:

  • Uncontrolled systemic disease
  • Start of medical therapy for diabetes or change in treatment from oral to insulin four months before initial visit.
  • HbA1c levels greater than 10%
  • Presence of retinal venous occlusion, cystoid macular edema,or other condition that would contribute to macular edema.
  • Presence of epiretinal membrane
  • Presence of vitreomacular traction in the study eye.
  • Neovascularization of disc or elsewhere in the study eye.
  • History or presence of choroidal neovascularization in the study eye.
  • Presence of rubeosis irides in the study eye.
  • Eye opacity that interfere with clinical documentation and photography.
  • Intra-ocular surgery 90 days before initial visit.
  • Scheduled surgery for study eye.
  • Patients with known allergies to fluorescein.
  Contacts and Locations
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Please refer to this study by its identifier: NCT00552435

Contact: Daniel Lavinsky 55-11-7658-8669
Contact: Jose A Cardillo 55-16-8115-1000

Vision Institute, Federal University of Sao Paulo Recruiting
Sao Paulo, SP, Brazil
Contact: Daniel Lavinsky, MD    55-11-7658-8669      
Principal Investigator: Jose A Cardillo         
Principal Investigator: Michel E Farah         
Sub-Investigator: Paulo Hilarião         
Sub-Investigator: Leonardo Castro         
Sub-Investigator: Daniel Lavinsky         
Sponsors and Collaborators
Federal University of São Paulo
Principal Investigator: Jose A Cardillo Federal University of Sao Paulo- Department of Ophthalmology
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Federal University of Sao Paulo, Vision Institute Department of Ophthalmology Identifier: NCT00552435     History of Changes
Other Study ID Numbers: MP-001
Study First Received: October 31, 2007
Last Updated: May 6, 2008

Additional relevant MeSH terms:
Macular Edema
Signs and Symptoms
Macular Degeneration
Retinal Degeneration
Retinal Diseases
Eye Diseases processed this record on April 28, 2017