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The Phase Angle of the Bioelectrical Impedance Analysis as Predictor of Post-Bariatric Weight Loss Outcome

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Abstract

Background

Bariatric surgery is proven to be the most effective therapy for obesity. However, the targeted weight reduction is not always achieved. Reliable predictors for postoperative success are rare. Also, most available predictors, such as gender and socioeconomic status, cannot be influenced. The aim of the study was to assess the reliability of the phase angle (PhA) as a predictor of weight reduction and body composition after bariatric surgery.

Methods

One hundred seventy-three patients (127 with Roux-en-Y gastric bypass and 46 with sleeve gastrectomy), treated between January 2004 and December 2012, were included into this prospective trial. Bioelectrical impedance analysis (BIA) was performed before and five times within the first year after the operation. Correlation between excess weight loss (EWL) was calculated using Pearson’s correlation coefficient and a receiver operating characteristic (ROC) curve.

Results

The average weight loss was significant with a total weight loss of 30.1 %, while the PhA did not show any significant decrease during the first 12 months after surgery. The correlation between the preoperative PhA and the postoperative EWL was significant after 6 weeks and after 6, 9, and 12 months. The ROC curve has an area of 0.7. The best point of the curve is a PhA of 3.9° with a sensitivity of 81 % and a specificity of 54 %.

Conclusions

PhA may be a useful predictor of EWL after bariatric surgery, and a PhA of 3.9° was calculated as the most suitable cut-off for a successful operation.

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Authors and Affiliations

  1. Department of Surgery, University Medical Center Mannheim, Heidelberg University, Mannheim, Germany

    Georgi Vassilev, Johannes Krammer, Peter Kienle, Ulrich Ronellenfitsch & Mirko Otto

  2. Department of Surgery, Alfried Krupp Krankenhaus, Essen, Germany

    Till Hasenberg

Authors
  1. Georgi Vassilev
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  2. Till Hasenberg
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  3. Johannes Krammer
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  4. Peter Kienle
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  5. Ulrich Ronellenfitsch
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  6. Mirko Otto
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Corresponding author

Correspondence to Mirko Otto.

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Conflict of Interest

The authors declare that they have no competing interests.

Ethical Approval

Approval from the local institutional review board (IRB) was obtained and is in agreement with the Helsinki Declaration.

Statement of Informed Consent

Informed consent was obtained from all individual participants included in the study.

Additional information

Georgi Vassilev and Till Hasenberg contributed equally to this work.

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Vassilev, G., Hasenberg, T., Krammer, J. et al. The Phase Angle of the Bioelectrical Impedance Analysis as Predictor of Post-Bariatric Weight Loss Outcome. OBES SURG 27, 665–669 (2017). https://doi.org/10.1007/s11695-016-2315-9

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  • DOI: https://doi.org/10.1007/s11695-016-2315-9

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