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Recent studies have shown that obesity is a major risk factor for idiopathic hyperaldosteronism (IHA). IHA patients have greater AGV than normal controls. However, it is unclear whether such changes are caused by obesity and whether losing weight could reverse the morphological and functional abnormalities of the adrenal gland. This study was to investigate the association of obesity with adrenal gland volume (AGV) and the effects of weight loss on AGV. This study recruited obese patients (N=25) who underwent sleeve gastrectomy and age- and sex-matched normal-weight (N=25) and overweight healthy volunteers (HV) (N=21). Thin-slice computed tomography was used to evaluate adrenal morphological changes. AGV was measured semiautomatically based on the digital imaging and communications in medicine (DICOM) image. The effects of weight loss on AGV were evaluated in patients for one year or more after sleeve gastrectomy. The results showed that left, right and total AGV were larger in obese patients than those in overweight and normal- weight HVs (6.77±0.36, 5.76±0.31, and 12.53±0.64 cm3 vs. 3.88±0.14, 3.09± 0.13 and 6.97± 0.24 cm3 vs. 3.38±0.23, 2.67±0.15 and 6.04±0.36 cm3). No statistically significant difference was identified between overweight and normal-weight HVs. Sleeve gastrectomy significantly reduced body weight (-27.1±2.5 kg), left AGV (-0.80±0.26 cm3), and right AGV (-0.88±0.20 cm2). However, the adrenal volume in five patients was not reduced, despite significant weight loss postsurgery. In brief, obesity leads to increased AGV, and in some cases, this effect seems to be irreversible. We speculate that obesity causes permanently adrenal morphological changes (increased volume or hyperplasia), and under certain circumstances, it results in excessive aldosterone secretion via altered adipokines (leptin, CTRP1, etc.).

MON-161 Body Weight Reduction Not Always Reduced Adrenal Gland Volume in Obese Patients