Abstract
Aim: To compare the measurement of total body water (TBW) and fat-free mass (FFM) using the criterion method of deuterium dilution space (2H2O) with bioelectrical impedance analysis (BIA) using a portable QuadScan 4000, Bodystat® in children and adolescents with phenylketonuria (PKU).
Methods: Sixteen patients with PKU, median age is 12.5 (range 5–20.6) years, were recruited into this cross-sectional study. TBW was measured by both deuterium dilution and BIA on the same occasion as per a standard protocol. FFM was estimated from predictive equations.
Results: There was no significant difference between TBWDeut and TBWBIA (p = 0.344) or FFMDeut and FFMBIA (p = 0.111). TBWDeut and TBWBIA were highly correlated (r = 0.990, p < 0.0001), as were FFMDeut and FFMBIA (r = 0.984, p < 0.0001). Bland-Altman plots demonstrated that there was no proportional bias between the criterion method, TBWDeut, and the test method TBWBIA, in estimating TBW (β = −0.056, adjusted r 2 = 0.069, p = 0.169) or FFM (β = −0.089, adjusted r 2 = 0.142, p = 0.083).
Conclusion: Our results suggest that when compared with the criterion method, the QuadScan 4000, Bodystat® can reliably be used to predict TBW and FFM in patients with PKU. We suggest that due to the portability and non-invasive approach, this method can reliably be used to monitor body composition in the outpatient clinic setting, to further improve the monitoring and assessment of nutritional status in PKU.
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Acknowledgments
Analysis was undertaken at the Stable Isotope Geochemistry Laboratory, School of Earth and Environmental Sciences, and the University of Queensland, and we thank Kim Baublys and Wei Zhou for their assistance.
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Communicated by: Francois Feillet, MD, PhD
Appendices
Synopsis
No predictive bias existed when measuring total body water or fat-free mass by deuterium dilution and bioelectrical impedance analysis (BIA) using the QuadScan 4000, Bodystat®; we therefore suggest that this instrument could be used as a method to monitor body composition in the outpatient clinic setting in patients with phenylketonuria.
Contributions of Individual Authors
All authors contribute to the submitted paper: contributing content development, drafting and revising the manuscript and providing final approval of the version to be submitted:
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1.
Maureen Evans has been responsible for conception and design of the project, data and sample collection, statistical analysis, researching and drafting of the manuscript through its various stages of development and completed the final version for submission.
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2.
Kay Nguo was responsible for the analysis and interpretation of the deuterium dilution samples and revising the manuscript critically for content and format.
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3.
Avihu Boneh was responsible for the interpretation of data and for revising the manuscript critically for content and format.
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4.
Helen Truby was responsible for supervising the project, conception and design and revising the manuscript critically for content and format.
Corresponding Author
Maureen Evans, Department of Metabolic Medicine, Royal Children’s Hospital, Melbourne, Australia. Tel.: +61383416376. Email address: maureen.evans@rch.org.au.
Competing Interest Statement
No person was provided with an honorarium, grant, or other form of payment to conduct the study or produce the manuscript. Maureen Evans, Kay Nguo, Avihu Boneh and Helen Truby declare that they have no conflict of interest.
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This research did not receive any specific grant or sponsorship from funding agencies in the public, commercial or not-for-profit sectors.
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This study was approved by the RCH Human Research Ethics Committee: HREC #32056D.
Patient Consent Statement
This manuscript does not contain any personal information about patients. Informed consent was obtained for all study participants as a requirement of the RCH Human Research Ethics Committee process.
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Evans, M., Nguo, K., Boneh, A., Truby, H. (2017). The Validity of Bioelectrical Impedance Analysis to Measure Body Composition in Phenylketonuria. In: Morava, E., Baumgartner, M., Patterson, M., Rahman, S., Zschocke, J., Peters, V. (eds) JIMD Reports, Volume 42. JIMD Reports, vol 42. Springer, Berlin, Heidelberg. https://doi.org/10.1007/8904_2017_75
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DOI: https://doi.org/10.1007/8904_2017_75
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