Razzera et al used bioelectrical analysis to evaluate patients in the intensive care unit (ICU). Several parameters were associated with nutritional risk and outcomes. The authors are from multiple institutions in Brazil.
Patient selection: intensive care unit
Analysis: bioelectrical analysis and bioelectrical impedance vector analysis (BIVA)
Parameters:
(1) phase angle in degrees
(2) BIVA in percent, as indicator of hydration
(3) resistance with or without adjusted for height in cm
(4) reactance with or without adjusted for height in cm
resistance adjusted for height =
= (resistance) / (height)
reactance adjusted for height =
= (reactance) / (height)
A phase angle < 5.5 degrees identify a patient at high nutritional risk with an accuracy of 79%.
A BIVA > 70% indicates hyperhydration and is a significant predictor of mortality (aOR 2.2).
Resistance, reactance, resistance adjusted for height and reactance adjusted for height are all greater in survivors than nonsurvivors. These probably correlate with hydration status. Their trends could be predictive.
Parameter
|
Survivor
|
Nonsurvivor
|
resistance
|
392.6 +/- 79.2
|
353.3 +/- 84.7
|
resistance adjusted for height
|
239.4 +/- 51.3
|
215.7 +/- 55.3
|
reactance
|
38.31 +/- 11
|
32.41 +/- 14.9
|
reactance adjusted for height
|
23.4 +/- 6.9
|
19.9 +/- 9.4
|