[Preliminary findings on 2 groups of diabetics with regard to platelet aggregation in relation to retinopathy and ultimate relation to antidiabetic therapy].

Platelet clumping was examined in untreated insulin-dependent and insulin-independent diabetics, with and without retinopathy. Hyperaggregation was noted, particularly in subjects with retinopathy and longstanding diabetes. Metformin normalised clumping in the course of mild diabetes.