Evidence map›Paper›PMID 27465938›Full record

Trial reportObesity surgery2017

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

Georgi Vassilev, Till Hasenberg, Johannes Krammer, Peter Kienle, Ulrich Ronellenfitsch, Mirko Otto

Abstract readClinical Trial
PubMed Publisher
In one paragraph

Trial report in Obesity surgery, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 27 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
27citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

27 citing papers in PubMed, 1 synthesis or guideline pooled it.

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4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

6 authors.

Georgi VassilevDepartment of Surgery, University Medical Center Mannheim, Heidelberg University, Mannheim, Germany.
Till HasenbergDepartment of Surgery, Alfried Krupp Krankenhaus, Essen, Germany.
Johannes KrammerDepartment of Surgery, University Medical Center Mannheim, Heidelberg University, Mannheim, Germany.
Peter KienleDepartment of Surgery, University Medical Center Mannheim, Heidelberg University, Mannheim, Germany.
Ulrich RonellenfitschDepartment of Surgery, University Medical Center Mannheim, Heidelberg University, Mannheim, Germany.
Mirko OttoDepartment of Surgery, University Medical Center Mannheim, Heidelberg University, Mannheim, Germany. mirko.otto@umm.de.ORCID 0000-0002-8131-7397

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundBariatric 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.

methodsOne 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.

resultsThe 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 %.

conclusionsPhA 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.

Indexed as

Bariatric SurgeryBody CompositionElectric ImpedanceWeight LossAdultBody Weights and MeasuresFemaleHumansLaparoscopyMaleMiddle AgedObesity, MorbidPostoperative PeriodPredictive Value of TestsPrognosisProspective StudiesBIA, bioelectrical impedance analysisPhAPhase anglePredictors of weight reductionRoux-en-Y gastric bypassRYGBSGSleeve gastrectomyWeight loss

Identifiers

PMID27465938

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.