Coeliac disease patients at greater risk of developing CVD despite fewer CV risk factors: BMJ

UK: Patients with coeliac disease have fewer known risk factors for cardiovascular disease (CVD); however, they are at a higher risk of developing CVD than those without celiac disease, a recent study published in BMJ Medicine has shown. 

The findings imply that CV risk scores used in clinical practice might not appropriately capture the excess CVD risk in patients with coeliac disease. Researchers suggest clinicians should be aware of the need to optimize CV heath in this population. 

It’s unclear what the reasons for this might be, and further research is needed to unearth the drivers behind these associations. According to the study authors, this includes the role of a gluten-free diet, which those affected are required to follow to ease symptoms.

Around 1% of the UK population has coeliac disease-an autoimmune condition caused by an exaggerated reaction to gluten, a dietary protein found in wheat, barley, and rye.

The condition is more common in women and is typically diagnosed in childhood and adolescence or between the ages of 40 and 60, say the researchers.

The published evidence on whether coeliac disease is associated with a heightened risk of cardiovascular disease is mixed. Previous studies have tended not to investigate the potential role of traditional cardiovascular risk factors, such as blood pressure or cholesterol.

To determine whether traditional cardiovascular risk factors might contribute to the link between coeliac disease and a heightened risk of cardiovascular disease (ischaemic heart disease, heart attack, and stroke), the researchers drew on medical data supplied by UK Biobank participants.

The UK Biobank is a population-based study that recruited around half a million 40-69 year olds from England, Scotland, and Wales between 2006 and 2010.

Of these, 2083 had coeliac disease but no cardiovascular disease, when recruited. Their cardiovascular health was monitored, using linked hospital records and death certificates, for an average of just over 12 years.

Those with coeliac disease were more likely to be women-56% vs 71.5%-and of white ethnicity-95% vs 99%-than those who didn’t have the condition.

During the monitoring period, 40,687 diagnoses of cardiovascular disease were recorded among all the surviving UK Biobank participants.

Some 218 of these incidents were in people with coeliac disease, equivalent to an annual rate of 9 in every 1000 people compared with an annual rate of 7.4/1000 in those without the condition.

This translates into a 27% heightened risk of cardiovascular disease for people with coeliac disease compared with those who didn’t have it, after accounting for a wide range of potentially influential lifestyle, medical, and cardiovascular disease factors.

Risk seemed to increase the longer a person had been living with their condition - to a 30% increased risk among those who had had coeliac disease for less than 10 years, rising to an increased risk of 34% among those who had had it for ten or more years.

Yet people with coeliac disease had fewer known risk factors for cardiovascular disease (including overweight or obesity; high systolic blood pressure; a history of smoking; and high cholesterol) being more likely to have a lower BMI and lower systolic blood pressure.

And they were more likely to have a so-called ideal cardiovascular risk score (23% vs 14%), and less likely to have a poor risk score (5% vs 9%) than people with coeliac disease.

When the researchers explored the potential joint effects of coeliac disease and cardiovascular risk score on incident cardiovascular disease, the risk increased by more than 60% in people with coeliac disease plus an ideal cardiovascular disease risk score compared with those with an ideal risk score but no coeliac disease.

This is an observational study, and as such, can’t establish cause and effect. And the researchers acknowledge various limitations to their findings, including that cardiovascular disease risk factors were measured at one point in time only.

But a number of autoimmune conditions are associated with a heightened risk of cardiovascular disease due to systemic inflammation; they point out.

The researchers didn’t look into dietary factors. Still, some previously published research suggests that a gluten-free diet might reduce inflammation and cardiovascular disease risk, while other studies indicate that this diet might boost the risk.

“This study highlights the importance of cardiovascular disease as a potential complication of coeliac disease. Further research into the drivers and mechanistic pathways of this association is warranted.

“In addition, an investigation is warranted into the extent to which any risk reduction is reported by adherence to a gluten-free diet in people with coeliac disease, or whether a gluten-free diet itself contributes to the increased risk identified,” they write

And they conclude: “Given the increased rates of the cardiovascular disease reported in people with coeliac disease who have an ideal and moderate cardiovascular disease risk score, clinicians should make patients with coeliac disease aware of their elevated risk and work with their patients to optimise their cardiovascular health.”

Reference:

Conroy M, Allen N, Lacey B, et alAssociation between coeliac disease and cardiovascular disease: prospective analysis of UK Biobank dataBMJ Medicine 2023;2:e000371. doi: 10.1136/bmjmed-2022-000371