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Clinical Application of Phase Angle and BIVA Z-Score Analyses in Patients Admitted to an Emergency Department with Acute Heart Failure
Published on: June 30, 2023
Determinants of bioelectrical phase angle in disease
Nicole Stobäus1, Matthias Pirlich, Luzia Valentini
1Department of General Medicine, Charité-Universitätsmedizin Berlin, Campus Benjamin Franklin, Germany.
The British Journal of Nutrition
|February 8, 2012
Summary
Malnutrition and inflammation significantly impact phase angle (PhA) in hospitalized patients, influencing morbidity and mortality predictions. Standardized PhA (SPhA) is a more reliable indicator of nutritional and health status.
Area of Science:
- Clinical Nutrition
- Bioelectrical Impedance Analysis
- Biomarkers
Background:
- Phase angle (PhA) from bioelectrical impedance analysis predicts patient outcomes but its determinants are not fully understood.
- Understanding PhA determinants is crucial for interpreting its prognostic value in clinical settings.
Purpose of the Study:
- To investigate the key determinants of phase angle (PhA) in hospitalized patients.
- To evaluate the influence of nutritional status, inflammation, and other factors on PhA.
Main Methods:
- Retrospective analysis of 777 hospitalized patients.
- Phase angle (PhA) measured using bioelectrical impedance analysis (50 KHz).
- Nutritional status assessed by Subjective Global Assessment (SGA); inflammation by C-reactive protein (CRP).
- General linear model regression analysis used to identify determinants of PhA and standardized PhA (SPhA).
Main Results:
- Age and malnutrition were the strongest determinants of PhA, followed by sex, CRP, and BMI.
- Malnutrition (85.4%) and inflammation (9.6%) were the only significant determinants of standardized PhA (SPhA).
- Malignant disease did not show a significant effect on PhA in the regression model.
Conclusions:
- Malnutrition and inflammation are major contributors to reduced PhA in sick individuals, explaining its prognostic power.
- Standardized PhA (SPhA) is a more specific indicator of nutritional status and inflammation than raw PhA.
- SPhA offers a potentially more reliable measure of health status in clinical practice.
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