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  • Aortic stenosis linked...

Aortic stenosis linked to insulin resistance in large national study

Dr. Kamal Kant KohliWritten by Dr. Kamal Kant Kohli Published On 2024-12-03T06:45:25+05:30  |  Updated On 3 Dec 2024 12:13 PM IST
Aortic stenosis linked to insulin resistance in large national study
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A large new population study of men over 45 indicates insulin resistance may be an important risk factor for the development of the world's most common heart valve disease – aortic stenosis (AS).

Published today in the peer-reviewed journal Annals of Medicine, the findings are believed to be the first to highlight this previously unrecognised risk factor for the disease.

It is hoped that by demonstrating this link between AS and insulin resistance-when cells fail to respond effectively to insulin and the body makes more than necessary to maintain normal glucose levels – new avenues for the prevention of the disease could open.

Aortic stenosis is a debilitating heart condition. It causes a narrowing of the aortic valve, restricting blood flow out of the heart. Over time, the valve thickens and stiffens, making the heart work harder to pump blood effectively around the body. If not addressed, this can gradually cause damage that can lead to life-threatening complications, such as heart failure.

People living with AS can take years to develop symptoms, which include chest pain, tiredness, shortness of breath and heart palpitations. Some may never experience symptoms, but may still be at risk of heart failure and death. Previously identified risk factors for AS include age, male sex, high blood pressure, smoking and diabetes.

Insulin resistance, which often develops years before the onset of type 2 diabetes, occurs when cells fail to respond effectively to insulin, the hormone responsible for regulating blood glucose levels. In response, the body makes more insulin to maintain normal glucose levels – leading to elevated blood insulin levels (hyperinsulinemia).

In the current study, researchers analysed data from 10,144 Finnish men aged 45 to 73 years old, all initially free of AS, participating in the Metabolic Syndrome in Men (METSIM) Study. At the start of the study, the researchers measured several biomarkers, including those related to hyperinsulinemia and/or insulin resistance. After an average follow-up period of 10.8 years, 116 men (1.1%) were diagnosed with AS.

The team identified several biomarkers related to insulin resistance – such as fasting insulin, insulin at 30 minutes and 120 minutes, proinsulin, and serum C-peptide – that were associated with increased AS risk. These biomarkers remained significant predictors of AS, even after adjusting for other known risk factors, such as body mass index (BMI) and high blood pressure, or excluding participants with diabetes or an aortic valve malformation.

The researchers then used advanced statistical techniques to isolate key biomarker profiles, identifying two distinct patterns that indicate insulin resistance as a predictor of AS, independent of other cardiovascular risk factors, such as age, blood pressure, diabetes, and obesity.

“This novel finding highlights that insulin resistance may be a significant and modifiable risk factor for AS,” says lead author Dr Johanna Kuusisto, from the Kuopio University Hospital, in Finland.

“As insulin resistance is common in Western populations, managing metabolic health could be a new approach to reduce the risk of AS and improve cardiovascular health in aging populations. Future studies are now warranted to determine whether improving insulin sensitivity through measures such as weight control and exercise can help prevent the condition.”

The major strengths of this study include its large population-based cohort and long follow-up period. However, its limitations include the sole focus on male subjects and the relatively small number of AS cases, which may limit the generalisability of the findings to other populations.

Reference:

Maija Sohlman, Raimo Jauhiainen, Biomarkers reflecting insulin resistance increase the risk of aortic stenosis in a population-based study of 10,144 Finnish men, Annals of Medicine, https://doi.org/10.1080/07853890.2024.2419996

Annals of Medicineheart valve diseaseInsulinAortic Stenosisheart failure
Source : Annals of Medicine
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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