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This is a prospective, randomized, open label, parallel, 16-week study to explore and evaluate the therapeutic effects of liraglutid, dapagliflozin and acarbose on the cognitive function, olfactory function, and odor-induced brain activation in overweight/obese patients with type 2 diabetes mellitus(T2DM) inadequately controlled with metformin monotherapy.
This is a prospective, randomized, open label, parallel, 16-week study to explore and evaluate the therapeutic effects of liraglutid, dapagliflozin and acarbose on the cognitive function, olfactory function, and odor-induced brain activation in overweight/obese patients with T2DM inadequately controlled with metformin monotherapy.We have 1 principle investigator, 6 sub-investigators and 1 nurse in research centre. The sub-investigators will screen in the outpatient and inpatient departments to enroll 87 patients (29 for each arm) totally with the inclusion and exclusion criteria in 12 months. The patients will be randomized at a 1:1:1 ratio into liraglutid, dapagliflozin and acarbose treatment group with a computer-generated random order. All patients will also continue on their existing dose and regimen of metformin throughout the study. At the baseline, clinical information collection, 100g-steamed bread meal test, biochemical measurement, body composition analysis, cognitive assessment, olfactory test and functional magnetic resonance imaging(fMRI) scan will be conducted for all patients. During the treatment period, visits at 4-week intervals will be performed to evaluate the safety of drugs and adjust the dose of metformin if hypoglycaemia occurs; meanwhile, fasting and 2-hour postprandial plasma glucose assayed by fingerstick, physical examination, and olfactory test will be conducted. At the end of the study, all of the assessments will be performed again for all recruited subjects, including early withdrawal patients.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Liraglutid | Active Comparator | Liraglutid will be titrated from 0.6mg/day to a final dose 1.8mg/day during the first 2 weeks, if well tolerated. Meanwhile, All patients will also continue on their existing dose and regimen of metformin throughout the study. Visits at 4-week intervals will be performed to evaluate the safety of drugs. Metformin dose can be reduced in response to hypoglycaemia, but liraglutid could not be adjusted. If the plasma glucose still not achieve the target at the maximum dose, the maximum dose will be maintained until the completion of the study. |
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| Dapagliflozin | Active Comparator | Dapagliflozin will be initiated and maintained at 10mg/day every morning until the completion of the study. Meanwhile, All patients will also continue on their existing dose and regimen of metformin throughout the study. Visits at 4-week intervals will be performed to evaluate the safety of drugs. Metformin dose can be reduced in response to hypoglycaemia, but dapagliflozin could not be adjusted. If the plasma glucose still not achieve the target at the maximum dose, the maximum dose will be maintained until the completion of the study. |
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| Acarbose | Active Comparator | Acarbose will be initiated at 50mg three times daily for the first week, and then titrated to100mg three times daily if appropriate. Meanwhile, All patients will also continue on their existing dose and regimen of metformin throughout the study. Visits at 4-week intervals will be performed to evaluate the safety of drugs. Metformin dose can be reduced in response to hypoglycaemia, but acarbose could not be adjusted. If the plasma glucose still not achieve the target at the maximum dose, the maximum dose will be maintained until the completion of the study. |
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Liraglutid | Drug | Liraglutid will be titrated from 0.6mg/day to 1.8mg/day during the first 2 weeks, if well tolerated. All patients will also continue on their existing dose and regimen of metformin throughout the study. |
| Measure | Description | Time Frame |
|---|---|---|
| Change of olfactory brain activation by fMRI | Compare the change of olfactory brain activation by fMRI from baseline to 16 weeks' follow-up | from baseline to 16 weeks' follow-up. |
| Measure | Description | Time Frame |
|---|---|---|
| Change of cognitive function | Compare the change of Montreal Cognitive Assessment (MoCA, beijing version) from baseline to 16 weeks' follow-up. MoCA score(ranging from 0 to 30)<26 is considered cognitive impairment and when the score is lower, the cognitive impairment is more serious. MoCA score ≥26 is considered normal cognition. | from baseline to 16 weeks' follow-up. |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| Da long Zhu, MD, PhD | Contact | 86-25-83-105302 | zhudldr@gmail.com | |
| Yan Bi, MD, PhD | Contact | 86-25-83-105302 | biyan@nju.edu.cn |
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| at Division of Endocrinology, the Affiliated Drum Tower Hospital of Nanjing University | Recruiting | Nanjing | Jiangsu | 210008 | China |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 35263425 | Derived | Cheng H, Zhang Z, Zhang B, Zhang W, Wang J, Ni W, Miao Y, Liu J, Bi Y. Enhancement of Impaired Olfactory Neural Activation and Cognitive Capacity by Liraglutide, but Not Dapagliflozin or Acarbose, in Patients With Type 2 Diabetes: A 16-Week Randomized Parallel Comparative Study. Diabetes Care. 2022 May 1;45(5):1201-1210. doi: 10.2337/dc21-2064. |
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| Dapagliflozin | Drug | Dapagliflozin will be initiated and maintained at 10mg/day every morning until the completion of the study. All patients will also continue on their existing dose and regimen of metformin throughout the study. |
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| Acarbose | Drug | Acarbose will be initiated at 50mg three times daily for the first week, and then titrated to 100mg three times daily if appropriate.All patients will also continue on their existing dose and regimen of metformin throughout the study. |
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| Proportion of patients whose MoCA<26 scores | Compare the proportion of patients whose MoCA<26 scores at baseline and at 16 weeks' follow-up. | at baseline and at 16 weeks' follow-up. |
| Change of blood glycaemic control | Compare the change of glycosylated hemoglobin(HbA1c) from baseline to 16 weeks' follow-up | from baseline to 16 weeks' follow-up |
| Proportion of patients whose HbA1c<7% | Analyze the proportion of patients whose HbA1c<7% at 16 weeks' follow-up. | at 16 weeks' follow-up. |
| Proportion of patients whose weight loss>3% and >5% | Analyze the proportion of patients whose weight loss>3% and >5% | from baseline to 16 weeks' follow-up. |
| Olfactory threshold test | The olfactory threshold test (score range 1-13.5) is determined based on a series of binary dilutions of the N-butanol solution in light mineral oil. The higher the score is, the more sensitive the participant is in detecting an odor. Scores of 8-10 were considered normal olfactory sensitivity, whereas scores of 1-3 signified olfactory dysfunction or anosmia, and scores of ≥10 indicate better olfactory sensitivity. | from baseline to 16 weeks' follow-up. |
| ID | Term |
|---|---|
| D003924 | Diabetes Mellitus, Type 2 |
| D009765 | Obesity |
| D060825 | Cognitive Dysfunction |
| ID | Term |
|---|---|
| D003920 | Diabetes Mellitus |
| D044882 | Glucose Metabolism Disorders |
| D008659 | Metabolic Diseases |
| D009750 | Nutritional and Metabolic Diseases |
| D004700 | Endocrine System Diseases |
| D050177 | Overweight |
| D044343 | Overnutrition |
| D009748 | Nutrition Disorders |
| D001835 | Body Weight |
| D012816 | Signs and Symptoms |
| D013568 | Pathological Conditions, Signs and Symptoms |
| D003072 | Cognition Disorders |
| D019965 | Neurocognitive Disorders |
| D001523 | Mental Disorders |
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| ID | Term |
|---|---|
| D008687 | Metformin |
| C529054 | dapagliflozin |
| D020909 | Acarbose |
| ID | Term |
|---|---|
| D001645 | Biguanides |
| D006146 | Guanidines |
| D000578 | Amidines |
| D009930 | Organic Chemicals |
| D014312 | Trisaccharides |
| D009844 | Oligosaccharides |
| D011134 | Polysaccharides |
| D002241 | Carbohydrates |
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