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To determine the effects of intravitreal injections of erythropoietin in eyes with severe, chronic diabetic macular edema, 5 eyes of 5 patients underwent injections of rHuEPO alpha (EPO).
All eyes had progressive vision loss and persistent or worsening edema with prior multi-modal treatment. EPO (5U/50 microL) was injected intravitreally every 6 weeks for three doses and followed for an additional 6 weeks with complete ocular examinations, fluorescein angiography, optical coherence tomography (OCT), and central field acuity perimetry.
Visual acuity of all patients was subjectively improved by 3 or more lines in 3 eyes and 1 line in 2 eyes. Visual acuity improved to a larger extent than anatomic improvement by OCT. Clearing of hard exudates but only minor improvement in leakage on fluorescein angiography was observed. Improvement in vision occurred within 1 week after the first injection and was maintained until the end point of the current case series (at 18 weeks after the first injection).
This case series seems to show a short-term positive response to EPO for a specific group of patients with chronic diabetic macular edema who were unresponsive to currently available therapies.