Bioelectric impedance devices have become a standard of care not only for peritoneal dialysis but also for hemodialysis patients. We compared the most important body composition variables (extracellular water, intracellular water, total body water and fat mass) measured with the multifrequency bioelectric impedance device InBody 720 (MF-BIA) and bioimpedance spectroscopy body composition monitor Fresenius (BIS BCM) in hemodialysis patients (n = 51, 175.1 + 7.8 cm, 82.2 + 15.2 kg) and healthy controls (n = 51, 175.1 + 7.6 cm, 82.3 + 15.3 kg). The MF-BIA InBody 720 device compared to the BIS BCM device showed significantly larger total body water and intracellular water estimates and significantly smaller extracellular water and body fat estimates in hemodialysis patients (p < 0.001). These differences (p < 0.001) were similar in the cohort of healthy controls; moreover, we observed high correlations in all variables between the hemodialysis patients and the healthy controls (0.80–0.95, p < 0.001). The mean relative differences in the order of 8% were lower for extracellular water and total body fat, but the limits of agreement were still wide enough to be clinically significant. We conclude that the results of the measurements with InBody 720 and BCM Fresenius cannot be used interchangeably. Physicians and nutritionists involved in the care of hemodialysis patients should be aware of this discrepancy between the two devices and should try to use the same device to track the body in their hemodialysis population in a longitudinal direction.

中文翻译：

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血液透析患者和健康对照者的身体成分监测仪和InBody 720生物阻抗设备用于身体成分估算的比较

生物电阻抗装置不仅已成为腹膜透析的治疗标准，而且已成为血液透析患者的治疗标准。我们比较了在血液透析患者中​​使用多频生物电阻抗仪InBody 720（MF-BIA）和生物阻抗谱人体成分监测仪费森尤斯（BIS BCM）测量的最重要的人体成分变量（细胞外水，细胞内水，总体内水和脂肪质量） （n = 51、175.1 + 7.8厘米，82.2 + 15.2公斤）和健康对照（n = 51、175.1 + 7.6厘米，82.3 + 15.3公斤）。与BIS BCM设备相比，MF-BIA InBody 720设备在血液透析患者中​​显示出明显更高的总体内水和细胞内水估计值以及显着更小的细胞外水和身体脂肪估计值（p <0.001）。这些差异（p <0.001）在健康对照人群中相似。此外，我们观察到血液透析患者和健康对照组之间所有变量之间的相关性很高（0.80-0.95，p <0.001）。细胞外水和体内总脂肪的平均相对差异在8％左右，但一致性限制仍然足够宽，具有临床意义。我们得出结论，InBody 720和BCM Fresenius的测量结果不能互换使用。参与血液透析患者护理的医师和营养师应意识到两种设备之间的这种差异，并应尝试使用同一设备纵向追踪其血液透析人群中的身体。