results from a meta-analysis show.
“We believe this analysis to be the most comprehensive review [of the Allurion balloon],” reported first author Daryl Ramai, MD, of the division of gastroenterology and hepatology, University of Utah, Salt Lake City, and colleagues in the research, published in the November/December 2021 issue of the Journal of Clinical Gastroenterology.
“Our study showed that the Allurion balloon reduces waist circumference and triglyceride levels and [is] associated with less adverse events when compared with other intragastric balloons,” the authors concluded.
Unlike other balloons, the Allurion gastric balloon is compressed into a small capsule that is connected to a thin catheter and, once swallowed, it is then inflated with 550 mL of liquid through the catheter to create a feeling of fullness and help control hunger.
The procedure can be performed on an outpatient basis in approximately 20 minutes, potentially avoiding the burden and extra costs of surgery or endoscopic placement and removal. After approximately 4 months, the balloon is designed to empty through a valve that spontaneously opens, and the balloon is then passed in the stool.
Though currently used around the world, the balloon does not yet have approval from the Food and Drug Administration.
Meta-analysis shows 12.2% average weight loss across studies
To assess the balloon’s performance, the authors identified 7 out of 273 published studies that met the analysis criteria. The studies included 2,152 patients, ranging in age from 18 to 65 years, with a mean baseline body mass index of 32.1-38.6 kg/m2.
All of the studies were prospective, with reported outcomes at 3-4 months, when the Allurion balloon typically deflates. Three of the studies were multicenter, while four were single center.
In terms of improvements in BMI, the results showed the pooled mean difference from baseline through to the end of the studies was 0.88 (P = .001), and the weighted average percentage of total body weight loss during treatment across the studies was 12.2%.
The mean excess body weight loss across the Allurion studies was 49.1%.
The analysis was not designed to directly compare outcomes with other balloons, but the authors note, for instance, that the ReShape Duo intragastric balloon (an FDA-approved dual-balloon system) has been reported in a previous study to be associated with a percentage of total body weight loss of 7.6% at 6 months, compared with 3.6% observed among those with lifestyle modifications.
However, a separate meta-analysis showed the pooled percentage of total body weight loss with the FDA-approved Orbera balloon to be about the same as the current Allurion analysis, at 12.3% at 3 months after implantation (followed by 13.2% at 6 months and 11.3% at 12 months). The analysis further showed excess body weight loss with the Orbera balloon at 12 months to be 25.4%.
In other outcomes, the current meta-analysis also showed significant improvements with the Allurion balloon in waist circumference of 0.89 (P = .001) and in triglyceride levels of 0.66 (P = .004) versus baseline.
Previous research involving the FDA-approved Obalon intragastric balloon, which is inflated with gas rather than liquid, showed a significant reduction in waist circumference from 109 cm (±12.3) to 99 cm (±10.5) (P < .05), and another study showed that 37.5% of patients receiving the Orbera balloon had normalized triglyceride levels after 4 months, without concomitant medical therapy.