Abstract
Tetrapolar, whole-body (hand-foot) bioelectrical impedance (Zwb) is utilized in body composition analysis for direct assessment of soft tissue hydration (Vector BIA) and indirect assessment of lean and fat soft tissue mass (BIA prediction equations). Limbs and trunk contribute to Zwb by 90% and 10%, respectively. We determined the effect on Zwb of local edema localized in one leg. Resistance (R) and reactance (Xc) components of Z vector was measured at 50 kHz (BIA-101, RJL Systems-Akern, Italy) in 20 adult male patients without edema, before and three days after a surgical procedure on vessels of one leg (femoro-popliteal bypass) that induced pitting edema in that leg. Zwb were measured from hand and foot of the right and left side. Z from the leg (Zleg) was measured from the pair of electrodes on foot and the other pair on the trochanter. Data were analyzed with Vector BIA (Piccoli’s RXc graph method, 95% confidence ellipses) that considers Zwb and Zleg as bivariate gaussian random vectors (expressed in Ohm/meter of conductor). Baseline mean vector from legs of either side, Zleg was significantly shorter than Zwb on the R-Xc plane (separate 95% confidence ellipses).
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