MANNHEIM, GERMANY – – rates that appear to have a substantial impact on these patients’ already increased risk of coronary artery disease, a registry analysis suggests.
Data on almost 36,000 individuals with FH were collated from an international registry, revealing that 55% of adults and 25% of children and adolescents with the homozygous form of FH had overweight or obesity. The figures for heterozygous FH were 52% and 27%, respectively.
Crucially, overweight or obesity was associated with substantially increased rates of coronary artery disease, particularly in persons with heterozygous FH, among whom adults with obesity faced a twofold increased risk, rising to more than sixfold in children and adolescents.
Moreover, “obesity is associated with a worse lipid profile, even from childhood, regardless of whether a patient is on medication,” said study presenter Amany Elshorbagy, DPhil, Cardiovascular Epidemiologist, department of primary care and public health, Imperial College London.
She added that, with the increased risk of coronary artery disease associated with heterozygous FH, the results showed that “together with lipid-lowering medication, weight management is needed.”
The research was presented at the annual meeting of the European Atherosclerosis Society.
Tended to be thin
Alberico L. Catapano, MD, PhD, director of cardiovascular research and of the Lipoproteins and Atherosclerosis Laboratory of IRCCS Multimedica, Milan, and past president of the EAS, said in an interview that, historically, few FH patients were overweight or obese; rather, they tended to be thin.
However, there is now “a trend for people with FH to show more diabetes and obesity,” with the “bottom line” being that, as they are already at increased risk of coronary artery disease, it pushes their risk up even further.
In other words, if a risk factor such as obesity is added “on top of the strongest risk factor, that is LDL cholesterol, it is not one plus one makes two, it is one plus one makes three,” he said.
As such, Dr. Catapano believes that the study is “very interesting,” because it further underlines the importance of weight management for individuals with increased LDL cholesterol, “especially when you have genetic forms, like FH.”
Dr. Catapano’s comments were echoed by session co-chair Ulrike Schatz, MD, leader of the lipidology specialty department at the University Hospital Carl Gustav Carus, Technical University of Dresden (Germany).
Indeed, she told Dr. Elshorbagy before her presentation that she finds “a lot of my FH patients have a tendency towards anorexia.”
In an interview, Dr. Elshorbagy said that that reaction was typical of “most of the clinicians” she had spoken to. Upon seeing her data, especially for homozygous FH patients, they say, “They are on the lean side.”
Consequently, the research team went into the study “with the expectation that they might have a lower prevalence of obesity and overweight than the general population,” but “that’s not what we’re seeing.”
Dr. Elshorbagy noted that it would be helpful to have longitudinal data to determine whether, 50 years ago, patients with HF “were leaner, along with the rest of the population.”
The registry data are cross-sectional, and the team is now reaching out to the respective national lead investigators to submit follow-up data on their patients, with the aim of looking at changes in body weight and the impact on outcomes over time.
Another key question for the researchers is in regard to fat distribution, as body mass index “is not the best predictor of heart disease,” Dr. Elshorbagy said, but is rather central obesity.
Although they have also asked investigators to share waist circumference data, she conceded that it is a measurement that “is a lot harder to standardize across centers and countries; it’s not like putting patients on a scale.”
Overall, Dr. Elshorbagy believes that her findings indicate that clinicians should take a broader, more holistic approach toward their patients – in other words, an approach in which lipid lowering medication is “key but is just one of several things we need to do to make sure the coronary event rate goes down.”