BIOIMPEDANCE VECTOR ANALYSIS IN PATIENTS WITH ANOREXIA NERVOSA

Abstract

The aim of this analysis is to evaluate the results of Bioimpedance Vector Analysis (BIVA) performed in patients with Anorexia Nervosa (AN). Anthropometric values, as body height and weight, were measured in patients with AN that accessed our service from May 2017 to July 2018. BIVA was performed with a single-frequency bioimpedance analyzer (BIA 101 RJL, Akern Bioresearch, Firenze, Italy) and resting energy expenditure (REE) measured with and indirect calorimetry. Median resistance, reactance and phase angle and standard deviations were calculated. From May 2017 to July 2018, n. 53 BIVA were performed in patients with AN. Results are presented in Table 1. Females are 94% of our sample; median age is 23,5 ±9,4 (16,7±1,5 in males, 24,0±9,5 in females); median BMI is 17,7±2,7 (15,6±3,0 in males, 17,8±2,7 in females); median resistance is 660±103 (694±197 in males; 658±98 in females); median reactance is 72±16 (76± in males; 72±16 in females); median phase angle is 6,4±1,8 (6,3±1,1 in males; 6,4±1,9 in females). Median REE is 1194±224 kcal (1316±107 in men; 1187±228 in women). The distribution of phase angles of our sample is shown in Figure 1, with the median phase angle indicated with the arrow. BIVA could be helpful and may distinguish between fluid or tissue-related increases in body weight over treatment period in patients with AN. Haas V, Riedl A, Hofmann T, Nischan A, Burghardt R, Boschmann M, Klapp B. Bioimpedance and bioimpedance vector analysis in patients with anorexia nervosa. Eur Eat Disord Rev. 2012 Sep;20(5):400-5.