Gastric embolization leads to loss of muscle as well as fat

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Doctors performing gastric artery embolization

Left gastric artery embolization leads to the loss of both fat and muscle, according to a new study presented at the annual meeting of the Radiological Society of North America (RSNA; 25–30 November, Chicago, USA). Researchers said the loss of muscle mass is concerning, and underscores the importance of proper nutritional counselling after the procedure.

Obesity is a major health issue worldwide, linked with several serious conditions such as heart disease, cancer and diabetes. First-line treatments such as diet and exercise often do not work, leading many patients to opt for gastric bypass surgery. The surgery, which reduces the size of the stomach, has been effective in treating obesity, but carries with it significant costs and potential complications.

Currently under investigation in clinical trials, left gastric artery embolization is a less invasive option to surgery. By blocking blood flow to the stomach, the embolic agents reduce the production of ghrelin, a hormone that stimulates hunger. Early studies have shown that embolization is effective in helping people lose weight, but information is lacking on how it might change a patient’s composition of muscle and fat.

“There has been lots of research focused on the efficacy of gastric artery embolization for weight loss,” said the lead author of the study, Edwin A Takahashi, vascular and interventional radiology fellow at the Mayo Clinic (Rochester, USA). “However, there has been no data on what is contributing to the weight loss, whether the patients are losing fat, as desired, or muscle mass, or some combination of the two.”

To learn more, Takahashi and colleagues studied CT scans of 16 overweight or obese patients who had undergone left gastric artery embolization to treat gastrointestinal bleeding. The scans were done before and approximately one and a half months after the procedure. The results were compared to those of a control group of 16 outpatients who did not undergo left gastric artery embolization but had CT scans at two different time periods for nonspecific abdominal pain. The investigators used the CT scans to measure body composition based on the differing densities of fat and muscle.

All 16 individuals experienced significant weight loss after the embolization procedure, losing an average of 6.4% of their body weight over one and a half months. Body mass index (BMI) dropped by 6.3%.

While the weight loss was not surprising to the researchers, the changes in body composition were. The skeletal muscle index fell by 6.8%. Loss of skeletal muscle can impair physical function and metabolism and put a person at higher risk of injury.

“The significant decrease in the amount of skeletal muscle highlights the fact that patients who undergo this procedure are at risk for losing muscle mass and need to be managed accordingly after procedure,” Takahashi said. “We must make sure they receive adequate nutrition to minimise the amount of muscle tissue they lose.”

As expected, the patients also lost a significant amount of body fat. Their overall body fat index dropped by an average of 3.7%. However, much of the fat loss was subcutaneous. Visceral fat, the more dangerous fat surrounding the organs and associated with serious health problems like heart disease and diabetes, did not decrease significantly over the course of follow-up.

The researchers plan to expand their studies in the future to include people who are specifically undergoing embolization as a treatment for obesity.

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