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  • Thiazolidinediones may...

Thiazolidinediones may prevent dementia in high risk patients of diabetes: BMJ

Written By : Dr. Kamal Kant Kohli Published On 2022-10-13T09:15:43+05:30  |  Updated On 13 Oct 2022 10:13 AM IST
Thiazolidinediones may prevent dementia in high risk patients of diabetes: BMJ
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Glitazones also known as thiazolidinediones or TZDs are older class of type 2 diabetes drugs used for controlling blood sugar effectively. Type 2 diabetes and dementia share some of the same physiological patterns, researchers have started to look at whether diabetes drugs might also help stave off or treat dementia. But to date, the findings have been inconsistent.

Researchers have found in a long term study that Use thiazolidinediones is linked to a 22% reduced risk of dementia. These drugs may effectively prevent dementia in patients at high risk with mild or moderate type 2 diabetes, and therefore it may now be worth prioritising in future clinical studies to see if thiazolidinediones can be repurposed, suggest the researchers.

The results of the study have been published in the open access journal BMJ Open Diabetes Research & Care.

To shed further light on this, the researchers compared dementia risk in older people with type 2 diabetes and treated with either a sulfonylurea or a thiazolidinedione (TZD) with those treated with metformin alone.

They drew on the electronic health records of 559,106 people diagnosed with type 2 diabetes from the national Veteran Affairs (VA) Health System, spanning the period from January 2000 to December 2019.

Only older patients (aged at least 60) and given a first prescription of metformin, or a sulfonylurea (tolbutamide, glimepiride, glipizide, or glyburide), or a TZD (rosiglitazone or pioglitazone) between January 2001 and December 2017 were included (559,106) in the study. Their health was tracked for an average of nearly 8 years.

After at least 1 year of drug treatment, use of a TZD alone was associated with a 22% lower risk of dementia from any cause, compared with the use of metformin alone.

Specifically, it was associated with an 11% lower risk of Alzheimer's disease and a 57% lower risk of vascular dementia. Given that vascular diseases increase the risk of Alzheimer's disease, TZDs may also help to reduce dementia and Alzheimer's disease in part through their favourable effects on the vascular system, say the researchers.

While the risk of dementia from any cause was 11% lower for the use of metformin and TZD combined, it was 12% higher for the use of a sulfonylurea drug alone, prompting the researchers to suggest that supplementing a sulfonylurea with either metformin or a TZD may partially offset these effects.

Further in-depth analysis indicated that those younger than 75 benefited more from a TZD than older patients, highlighting the importance of early prevention for dementia, note the researchers. And these drugs also seemed to be more protective in overweight or obese patients.

This is an observational study, so definitive conclusions can't be drawn about cause and effect. And the researchers acknowledge that certain potentially influential information wasn't available, including kidney function and genetic factors, and that study participants were predominantly male and White.

But they suggest that future studies for repurposing diabetes drugs for dementia prevention might want to consider prioritising TZDs, based on their findings.

And they conclude: "These findings may help inform medication selection for [older] patients with [type 2 diabetes] at high risk of dementia."

Reference :

Tang X, Brinton RD, Chen Z, et alUse of oral diabetes medications and the risk of incident dementia in US veterans aged ≥60 years with type 2 diabetesBMJ Open Diabetes Research and Care 2022;10:e002894. doi: 10.1136/bmjdrc-2022-002894

BMJ Open Diabetes Research & CareType 2 DiabetesDementiaDiabetesAlzheimer’s diseaseGlitazonesMetforminTZDblood sugar
Source : BMJ Open Diabetes Research & Care
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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