Type 2 Diabetes Mellitus Clinical Trial
Official title:
A Cross-sectional and Longitudinal Study to Establish Diagnostic Models Based on Olfactory Function and Odor-induced Brain Activation for Diabetes-Related Cognitive Impairment
This is a cross-sectional and longitudinal study to establish diagnostic models based on olfactory function assessments and odor-induced brain activation for cognitive impairment in patients with type 2 diabetes mellitus.
Patients with diabetes have increased risks of cognitive impairment and dementia, which affecting the quality of life and diabetes management. Therefore, it is an urgent challenge to identify non-invasive biomarkers for early diagnosis and prognosis of the cognitive decline in patients with diabetes. Previous research has shown that both olfactory dysfunction and decreased odor-induced brain activation are present before clinically measurable cognitive decrements in type 2 diabetes. This is a cross-sectional and longitudinal study to establish diagnostic models based on olfactory function assessments and odor-induced brain activation for cognitive impairment in patients with type 2 diabetes mellitus. The investigators will recruit 200 patients with type 2 diabetes in the outpatient and inpatient departments. Health controls will be recruited from the community. At the baseline, clinical information collection, 100g-steamed bread meal test, biochemical measurement, cognitive assessments, olfactory test and functional magnetic resonance imaging(fMRI) scan will be conducted for all participants. Study duration was 3 years with a follow-up every 18 months. In the longitudinal study, all of the assessments will be repeated to evaluate changes of observational parameters. ;
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