Abdominal fat distribution (subcutaneous vs. visceral abdominal fat compartments): correlation with gender, age, BMI and waist circumference Poster No.: C-934 Congress: ECR 202 Type: Scientific Exhibit Authors: D. Vasin, A. Djuric-Stefanovic, L. M. Lazic, I. S. Popovic S., 2 J. Djokic Kovac, D. Masulovic, D. Saranovic ; Belgrade/RS, 2 Beograd/RS Keywords: Abdomen, Abdominal wall, CT-Quantitative, CT DOI: 0.594/ecr202/C-934 Any information contained in this pdf file is automatically generated from digital material submitted to EPOS by third parties in the form of scientific presentations. References to any names, marks, products, or services of third parties or hypertext links to thirdparty sites or information are provided solely as a convenience to you and do not in any way constitute or imply ECR's endorsement, sponsorship or recommendation of the third party, information, product or service. ECR is not responsible for the content of these pages and does not make any representations regarding the content or accuracy of material in this file. As per copyright regulations, any unauthorised use of the material or parts thereof as well as commercial reproduction or multiple distribution by any traditional or electronically based reproduction/publication method ist strictly prohibited. You agree to defend, indemnify, and hold ECR harmless from and against any and all claims, damages, costs, and expenses, including attorneys' fees, arising from or related to your use of these pages. Please note: Links to movies, ppt slideshows and any other multimedia files are not available in the pdf version of presentations. www.myesr.org Page of 7
Purpose Obesity is defined as the accumulation of adipose tissue above the normal values. For the evaluation of the abdominal obese are used indirect and direct methods. Indirect anthropometrical measuring includes: body weight, body-mass index (BMI), waist (WC) and hip circumference. Direct methods are: computed tomography (CT), magnetic resonance imaging and spectroscopy (MRI/MRS) and dual-energy X-ray absorptiometry (DXA). CT is sophisticated imaging procedure which is used as standardized technique for quantification of abdominal adipose tissue and his compartments, visceral and subcutaneous fat. Purpose of this study is to analyze if distribution of abdominal adipose tissue, which consists of two compartments: subcutaneous and visceral fat, measured by CT, correlates with gender, age, body mass index (BMI) and waist circumference (WC). Methods and Materials Abdominal CT examinations of 93 adult individuals taken at the Department of digestive radiology in Clinical center of Serbia were retrospectively analyzed (46 females, 47 males; age 6-82, average 56). Total (TF), visceral (VF) and subcutaneous (SF) abdominal fat areas were measured on a single axial CT scan at the level of umbilicus, using standardized technique. VF/SCF index, BMI and WC were recorded for each individual. T-test for independent samples and Pearson's coefficient of linear correlation (r), were used in statistical analyses. Images for this section: Page 2 of 7
Fig. : Axial CT image at the level of the umbilucus: measurement of the subcutaneous fat (SCF), body antero-posterior diameter (B-AP), body latero-lateral diameter (B-LL) and visceral antero-posterior diameter (V-AP). Page 3 of 7
Fig. 2: Axial CT image at the level of the umbilucus: method of measurement body area (BA) and visceral area (VA). SCF=BA-VA. VF was exctracted from VA. Page 4 of 7
Fig. 3: Method of measuring average density of fat tissue. Page 5 of 7
Results No significant correlation with gender of TF (p=0.944), VF (p=0.058) or SCF (p=0.83) was found, but it was found with VF/SCF index (p=0.048). VF/SCF index (mean±sd) was:.7±0.88, and 0.83±0.76 in male and female, respectively. VF strongly correlated with age (p<0.000), while SF did not (p=0.442). All abdominal fat compartments strongly correlated with BMI (p<0.000): TF (r=0.702), VF (r=0.408), SF (r=0.720), while VF/ SCF index correlated, but less strongly (r=-0.26, p=0.038). BMI correlated with VF more strongly in women (r=0.474, p=0.00) than in men (r=0.377, p=0.009). Similarly, all abdominal fat compartments strongly correlated with WC (p<0.000), but more strongly TF (r=0.904) and SF (r=0.86), than VF (r=0.586). WC correlated with VF more strongly in man (r=0.66) than in woman (r=0.538). Borderline correlation was found between VF/ SCF index and WC (r=-0.204, p=0.05). BMI and WC correlated strongly to each other (r=0.753, p<0.000). Conclusion While all abdominal fat compartments strongly correlate with BMI and WC, as two widely used markers of body obesity, visceral fat compartment, which is considered as the main risk factor for development of metabolic syndrome and cardiovascular diseases, correlates most weakly, especially in male population. References. Snijder MB, Visser M, Dekker JM, Seidell JC, Fuerst T, Tylavsky F et al. The prediction of visceral fat by dual-energy X- ray absorptiometry in the eldery: a comparison with computed tomography and anthropometry. International Journal of Obesity 2002; 26: 984-993. 2. Kuk J, Saunders T, Davidson L, Ross R. Age-related changes in total and regional fat distribution.elsevier Ageing Research Reviews 8 2009; 8: 339-348. 3. Yoshizumi T, Nakamura T, Yamane M, Islam A, Menju M, Yamasaki K et al. Abdominal fat: standardized technique for measurement at CT. Radiology 999; 2: 283-286. Page 6 of 7
Personal Information Dragan Vasin, MD Department for digestive diseases Center for radiology and MRI Clinical center of Serbia mail: gigastik@yahoo.com tel: 003863443543 Page 7 of 7