Effects of intensified metabolic control on CNS function in type 2 diabetes

Psychoneuroendocrinology
Gerald K CoorayTom Brismar

Abstract

The mild cognitive decline associated with type 2 diabetes (T2DM) has been suggested to be reversible with improved glycemic control. In order to characterise this cognitive decline and study the effects of improved glycemic control we have studied patients with T2DM (N=28) and healthy control subjects (N=21). One group of patients with diabetes (N=15) were given a 2-month treatment of intensified glycemic control, whereas the other group (N=13) maintained their regular treatment. Cognitive function in four different domains, auditory event-related potentials (ERPs) and resting EEG power spectrum were studied in the two groups of patients and in healthy control subjects before and after the 2-month trial period. There were significant differences at baseline (p<0.02) between patients with T2DM and controls. Patients had lower scores in two cognitive domains: verbal fluency (p<0.01) and visuospatial ability (p<0.03). T2DM also affected ERP with a decrease in N100 amplitude (p<0.04) and an increase in P300 latency (p<0.03). Furthermore, resting EEG activity in the beta band (13-30Hz) was reduced (p<0.04). The change between 1st and 2nd investigation was significantly different in the three groups of patients/subjects (p<0.03). Pa...Continue Reading

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