Bioelectrical impedance phase angle as a prognostic marker in chronic heart failure

Area of Science:

• Cardiology
• Clinical Nutrition
• Biophysics

Background:

• Heart failure (HF) is a complex syndrome associated with significant morbidity and mortality.
• Prognostic markers are crucial for identifying patients at high risk and guiding treatment strategies.
• The bioelectrical phase angle (PA) reflects body cell mass and fluid status, potentially offering prognostic insights.

Purpose of the Study:

• To evaluate the prognostic significance of the bioelectrical phase angle (PA) in patients diagnosed with heart failure.
• To determine if PA independently predicts all-cause mortality in heart failure, beyond established risk factors.

Main Methods:

• Retrospective analysis of 389 heart failure patients.
• Collection of anthropometric, body composition, clinical, biochemical, and echocardiographic data.
• Classification into four groups based on PA quartiles and survival analysis using Cox regression.

Main Results:

• Lower PA (<4.2°) correlated with lower BMI, reduced handgrip strength, and decreased hemoglobin.
• Patients with lower PA were more likely to be in NYHA functional class III and have renal failure.
• A PA <4.2° was identified as an independent predictor of all-cause mortality (RR 3.08).

Conclusions:

• Reduced bioelectrical phase angle is linked to malnutrition and poorer clinical status in heart failure.
• The bioelectrical phase angle serves as an independent prognostic marker for all-cause mortality in chronic heart failure.
• PA measurement offers a simple, non-invasive tool for risk stratification in heart failure management.