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Visceral fat loss evaluated by total body magnetic resonance imaging in obese women operated with laparascopic adjustable silicone gastric banding

Abstract

OBJECTIVE: To investigate the changes of visceral fat, as compared with total and subcutaneous adipose tissue (AT) in obese patients operated with laparascopic adjustable silicone gastric banding (LAP-BAND).

SUBJECTS: Six premenopausal morbid obese (body mass index range: 41.4–44.2 kg/m2) women, aged 38–42 y, operated with LAP-BAND, evaluated before, 8 weeks after, and 24 weeks after surgery.

MEASUREMENTS: Fat distribution was analysed by total body multi-slices MRI. Total AT, gluteo-femoral subcutaneous AT, abdominal subcutaneous AT, and abdominal visceral AT volumes were measured. FM was calculated from MRI-determined total AT volume and AT density.

RESULTS: A weight loss of 9.9±3.8 kg was observed in the first 8 weeks after LAP-BAND (0–8 weeks), and a further weight loss of 7.1±4.9 kg in the subsequent 16 weeks (8–24 weeks). Total AT showed a statistically significant reduction of 6.2±4.0 l in 0–8 weeks and a further significant reduction of 7.7±3.9 l in 8–24 weeks (P<0.01 from baseline). A similar trend was observed for both abdominal and gluteo-femoral subcutaneous AT. Visceral AT showed a statistically significant reduction of 1.0±0.9 l in the 0–8 weeks (P<0.05) and a further non-significant reduction of 0.6±0.7 l in 8–24 weeks (P<0.05 from baseline). In 0–8 weeks, the relative reduction of visceral AT was higher than the relative reduction of both total AT and gluteo-femoral subcutaneous AT. A highly significant correlation was observed between the reduction of total AT and the reduction of both abdominal and gluteo-femoral subcutaneous AT. By contrast, in 0–8 weeks, the reduction of total AT and the reduction of visceral AT were not correlated. In a subsequent analysis, both observations collected in the first 8 weeks after LAP-BAND and observations collected in the last 16 weeks are simultaneously considered, leading to a total of 12 time periods (two time periods for each individual patient). In order to identify factors associated with preferential visceral fat reduction, we calculated for each of the 12 time periods the difference between the percentage changes of visceral AT and the percentage changes of total AT. The relationship between this difference and several other variables were investigated by simple correlation analysis. The only variables found to be associated were the initial visceral AT volume, the absolute level of weight loss (kg) per week of observation, and the relative level of weight loss (%) per week of observation.

CONCLUSION: In the phase of rapid weight loss following LAP-BAND, a preferential mobilization of visceral fat, as compared with total and subcutaneous AT, can occur. However, this preferential visceral fat reduction occurs only in those patients presenting higher levels of visceral fat deposition at baseline and higher levels of weight loss.

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Busetto, L., Tregnaghi, A., Bussolotto, M. et al. Visceral fat loss evaluated by total body magnetic resonance imaging in obese women operated with laparascopic adjustable silicone gastric banding. Int J Obes 24, 60–69 (2000). https://doi.org/10.1038/sj.ijo.0801086

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