The presence of cerebral white matter lesions and lower skin microvascular perfusion predict lower cognitive performance in type 1 diabetes patients with retinopathy but not in healthy controls - a longitudinal study.

OBJECTIVE: Cognitive impairments in type 1 diabetes may result from hyperglycemia-associated cerebral microangiopathy. We aimed to identify cerebral microangiopathy and skin microvascular dysfunction - as surrogate marker for generalized microvascular function - as predictors of cognitive performance over time.

METHODS: In this prospective cohort study, 25 type 1 diabetes patients with proliferative retinopathy and 25 matched healthy controls underwent neurocognitive testing at baseline and after follow-up (3.8±0.8 years). At baseline, 1.5 T cerebral magnetic resonance imaging was used to detect white matter lesions (WML) and cerebral microbleeds. Skin capillary perfusion was assessed by means of capillary microscopy.

RESULTS: In type 1 diabetes patients, but not in healthy controls, the presence of WML (ß=-0.419;p=0.037) as well as lower skin capillary perfusion (baseline: ß=0.753;p<0.001; peak hyperemia: ß=0.743;p=0.001; venous occlusion: ß=0.675;p=0.003; capillary recruitment: ß=0.549;p=0.022) at baseline were associated with lower cognitive performance over time, independent of age, sex, HbA1c and severe hypoglycemia. The relationship between WML and lower cognitive performance was significantly reduced after adjusting for capillary perfusion.

CONCLUSIONS: These data fit the hypothesis that cerebral microangiopathy is a manifestation of generalized microvascular dysfunction, leading to lower cognitive performance. This article is protected by copyright. All rights reserved.