Bioelectrical Impedance Phase Angle: Utility in clinical practice

Pablo Gustavo de Oliveira, Amanda Senna Pereira dos Santos, Elza Daniel de Mello


The choice of the best nutrition assessment method in hospitalized patients remains a challenge. The aim of this study
was to review the use of phase angle (PA) in clinical practice. PA is a parameter obtained from bioelectrical
impedance analysis, being a derived measure from the relationship between resistance and reactance. Because PA is
dependent on body cell mass (BCM) and cell membrane functions, it has been considered a prognostic marker in
several clinical conditions. BCM reflects the cellular components responsible for energy transfer and biochemical
activity and is considered an excellent reference for expressing the rates of physiological processes, such as energy
expenditure and proteolysis. Low PA values suggest cell death or decreased cell integrity, whereas higher PA values
suggest a large amount of intact cell membranes, with a consequently better prognosis. The literature lacks studies
determining PA reference values, which has prevented its use in routine clinical practice. Reference values are
therefore necessary to properly evaluate possible deviations from the population mean.


Phase angle; Malnutrition; Nutrition assessment

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Utilizacao.pdf. Acesso em 22 de fevereiro de 2012.



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