S. Robert et al., BIOELECTRICAL-IMPEDANCE ASSESSMENT OF NUTRITIONAL-STATUS IN CRITICALLY ILL PATIENTS, The American journal of clinical nutrition, 57(6), 1993, pp. 840-844
The objective of this study was to assess the utility of bioelectrical
impedance analysis (BIA) in determining nutritional status in critica
lly ill patients in the intensive care unit (ICU). Data were collected
prospectively in 33 mechanically ventilated medical and surgical ICU
patients requiring nutrition as part of their care. BIA, with subseque
nt calculation of body-composition indexes, was performed every other
day for the duration of ICU stay. Body cell mass (BCM) changes correla
ted with energy and protein intakes (r2 = 0.87, P < 0.001 and r2 = 0.6
7, P < 0.001, respectively). Maintenance of BCM was achieved by a dail
y provision of 125.5 kJ.kg-1.d-1 (30 kcal.kg-1.d-1) and 1.5 g protein/
kg whereas greater intakes allowed restoration of BCM. The mean ratios
of exchangeable sodium to potassium (Na(e):K(e)) improved only in pat
ients achieving positive nitrogen balance (P = 0.013), Body-compositio
n changes determined by BIA represent a feasible adjunctive method for
evaluating and monitoring nutritional status in ICU patients.