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Association between the Distribution of Adipose Tissue and Outcomes in Acute Pancreatitis: A Comparison of Methods of Fat Estimation.

Purpose  To assess the correlation between abdominal fat measured at computed tomography (CT) and dual-energy X-ray absorptiometry (DXA) and association with clinical outcomes in patients with acute pancreatitis (AP). Methods  This prospective study comprised consecutive patients with AP who underwent abdominal CT and DXA. Fat estimation was done on whole-body DXA and abdominal CT. Correlations among body mass index (BMI), waist circumference (WC), DXA, and CT fat measurements were determined. The association between fat measurements and clinical outcomes was assessed. Results  Fifty-nine patients (mean age 38.2 years, 48 males) were included. There was a strong correlation ( r  = 0.691-0.799) between DXA and CT fat estimation. In addition, there was a significant association of the visceral adipose tissue (VAT) on DXA and CT with the severity of AP ( p  = 0.039 and 0.021, respectively) and the need for drainage of collections ( p  = 0.026 and 0.008, respectively). There was a weak correlation of the BMI and WC with the length of hospitalization (LOH) ( r  = 0.121, 0.190, respectively) and length of intensive care unit stay (LOICU) ( r  = 0.211, 0.197), while there was a moderate to strong correlation of the truncal fat and visceral fat on DXA and total adipose tissue and VAT on CT with LOH ( r  = 0.562, 0.532, 0.602 and 0.614, respectively) and LOICU ( r  = 0.591, 0.577, 0.636, and 0.676, respectively). Conclusion  In conclusion, fat indices measured on DXA and CT are associated with the severity of AP. In addition, the fat measurements at DXA are strongly correlated with those obtained at CT.

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