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Abstract: PO0865

Consistency of the Dry Weight of Hemodialysis Patients Predicted Using Bioelectrical Impedance Analysis Between Standing and Lying-Down Positions

Session Information

Category: Dialysis

  • 701 Dialysis: Hemodialysis and Frequent Dialysis

Author

  • Kim, Hyunsuk, Chuncheon Sacred Heart Hospital, Chuncheon, Gangwon-do, Korea (the Republic of)
Background

Although the InBody S10 is widely used for hemodialysis patients in the lying position, clinicians must make the measurements in person. In contrast, patients can use the InBody 770 to obtain measurements by themselves in the standing position according to instructions provided by the machine, which may be more convenient. Therefore, this study compared the measurements of hemodialysis patients’ dry weight obtained lying down using the S10 to those obtained in the standing position using the 770.

Methods

Measurements from 56 patients before and after hemodialysis were obtained. Dry weight was calculated using the ratio of extracellular water to total body water, taking into consideration diabetes status and albumin levels, and comparing the results according to body position (lying vs. standing).

Results

The patients’ median age was 64 years old, and 51% were men. Their mean dry weight before hemodialysis was 60.0±12.5 kg using the S10 device and 60.1±12.5 kg using the 770 device (paired t-test; t=-6.472, P<0.001). The correlation between these measurements was high (R2=1.0000). Patients’ mean dry weight after hemodialysis was 58.4±12.2 kg using the S10 device and 58.5±12.0 kg using the 770 device (paired t-test; t=-1.560, P=0.124). The correlation between these measurements was also very close (R2=1.0000). The Bland-Altman test yielded similar results.

Conclusion

This study showed that patients’ predicted dry weights in the lying position using the InBody S10 device and in the standing position using the InBody 770 device were consistent in both pre- and post-hemodialysis states. It can be concluded that the dry weight of a patient in the standing position can be measured with more convenience and autonomy using the InBody 770 device.