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Outcomes of Subthreshold Laser Versus Intravitreal Injection of Ranibizumab in Diabetic Macular Edema

Not Applicable
Completed
Conditions
Diabetic Macular Edema
Interventions
Procedure: laser interference,INTRAVITREAL INJECTION
Registration Number
NCT04332133
Lead Sponsor
Minia University
Brief Summary

The aim of this study is To compare the anatomical and functional results of intravitreal( IV) injection of ranibizumab with sub threshold micropulse laser ( SML) in treatment of Diabetic macular edema (DME) both anatomically by spectral domain optical coherence tomography (SD OCT) and functionally by best-corrected visual acuity (BCVA) and multifocal electroretinogram (mfERG).

Detailed Description

Diabetic macular edema (DME) causes significant visual loss in diabetic patients. About 20% and 40% of patients with Type 1 and Type 2 diabetes mellitus (DM), respectively, develop DME. One-third of diabetic patients who have had DM for more than twenty years will develop DME . Early impairment in the function of the middle and inner layers of the retina has been reported in diabetic patients before appearance of vascular complications . A good independent guide of macular function in patients with DME is multifocal electroretinogram (mfERG) readings from the macular area, which strongly associate with morphologic alterations in the macula. Some investigators suggested that temporal characteristic (implicit time) of mfERG waves are more important than amplitudes for evaluation of retinal function in diabetic patients. They concluded that patients with DM show temporal changes indicating delayed neural transmission due to local impairment of blood glucose metabolism. In contrast, others emphasize the importance of both parameters (implicit time and amplitude) in identifying retinal affection in DM.

Intravitreal (IV) injections of anti-vascular endothelial growth factor (VEGF) agents provided good visual outcomes in treatment of DME. However, IV anti-VEGF injections are expensive, need to be repeated many times and have the potential risk of causing endophthalmitis . Subthreshold micropulse laser (SML) treatment of DME has the same effect as conventional laser treatment, nonetheless, there is less damage to adjacent tissues of the burn area in the retinal pigment epithelium (RPE). SML allows laser emission to be divided into bursts of short cyclic pulses that remain for microseconds permitting substantial cooling amid these short pulses .

Recruitment & Eligibility

Status
COMPLETED
Sex
All
Target Recruitment
80
Inclusion Criteria
  • DME with BCVA<0.5 decimal Snellen acuity.
  • Controlled blood glucose (HbA1c) <6.5%.
Exclusion Criteria
  • History of previous intraocular surgery,
  • History of previous laser treatment,
  • History of previous IV injection,
  • Macular disease or ischemia,
  • Proliferative diabetic retinopathy,
  • Vitreoretinal traction,
  • Interruption of external limiting membrane (ELM) or ellipsoid zone (EZ).
  • Dense media opacity,
  • Optic disc pathology
  • History of strokes or ischaemic heart diseases.
  • patients with (CST) > 400 µm on OCT .

Study & Design

Study Type
INTERVENTIONAL
Study Design
PARALLEL
Arm && Interventions
GroupInterventionDescription
group 1laser interference,INTRAVITREAL INJECTIONgroup 1 of DME which treated by SML
group 2laser interference,INTRAVITREAL INJECTIONGroup 2 of DME which treated by intravitreal injection of Ranibizumab
Primary Outcome Measures
NameTimeMethod
p1 amplitude of mfERG6mnths

p1 amplitude of multifocal ERG measured in nv/deg2

central subfield thickness in micrometer6 months

OCT for the macular area with measuring CST in micron

BCVA6 months

BCVA is measured in decimal of Snellen visual acuity

Secondary Outcome Measures
NameTimeMethod
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