Cardiovascular MRI shows that abdominal obesity is linked to harmful changes in heart structure, especially in men, according to a study presented December 1 at the RSNA meeting in Chicago.
The finding is from an analysis of 2,173 subjects in whom researchers explored the effects of obesity on the heart based on waist-to-hip ratio (WHR) and body mass index, noted lead author Jennifer Erley, MD, of the University Medical Center Hamburg-Eppendorf, Germany, in a RSNA release.
“Abdominal obesity according to WHR is associated to concentric remodeling, while a higher body mass is associated with ventricular dilatation,” she said.
While body mass index (BMI) is a measure of general obesity calculated from a person’s weight and height, waist-to-hip ratio (WHR) is a measure of abdominal obesity, the accumulation of visceral fat deep around internal organs. In this study, Erley and colleagues analyzed the effects of these two measures on the heart, based on sex.
Out of the 2,173 subjects (43% female, mean age 64 years old), 80% of whom were obese according to the WHR (≥ 0.85 in females, ≥ 0.90 in males), and 20% were obese based on BMI (BMI ≥ 30). Participants had no known cardiovascular disease.
According to the results, increases in WHRs were associated with a higher left ventricular (LV) mass and lower ventricular volumes, and their association with right ventricular volumes was weaker in females than in males.
Pictogram showing the results of the research. An increase in waist-to-hip ratio (WHR) is associated with a higher left ventricular (LV) mass and lower ventricular volumes. Its association with right ventricular (RV) volumes is weaker in women than in men. An increase in body mass index (BMI) is associated with ventricular dilatation and a higher LV mass, although this relationship is also weaker in women.RSNA
“[Abdominal obesity] appears to lead to a potentially pathological form of cardiac remodeling, concentric hypertrophy, where the heart muscle thickens, but the overall size of the heart doesn’t increase, leading to smaller cardiac volumes. In fact, the inner chambers become smaller, so the heart holds and pumps less blood. This pattern impairs the heart’s ability to relax properly, which eventually can lead to heart failure,” she said.
Regarding sex-specific differences, Erly suggested that male patients may be more vulnerable to the structural effects of obesity on the heart, which is a finding not widely reported in earlier studies. She said that rather than focusing on reducing overall weight, middle-aged adults should focus on preventing abdominal fat accumulation through regular exercise, a balanced diet, and timely medical intervention, if necessary.
From a radiologist's perspective, she added that clinicians typically think of cardiomyopathy, hypertensive heart disease, or some other form of disease when they see this cardiac remodeling pattern, rather than connecting it to obesity in reports.
“This study should alert radiologists and cardiologists to be more aware that this remodeling could be attributed independently to obesity,” Erly said.
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