Comparison of two bioelectrical impedance devices and dual-energy X-ray absorptiometry to evaluate body composition in heart failure
Comparison of two bioelectrical impedance devices and dual-energy X-ray absorptiometry to evaluate body composition in heart failure
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DOI：
10.1111/jhn.12218
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发表时间：
2014-12-01
影响因子：
3.3
通讯作者：
Clausell, N.
中科院分区：
文献类型：
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作者：
Alves, F. D.;Souza, G. C.;Clausell, N.
背景：生物电阻抗分析(BIA)在心力衰竭中的应用受多种因素的影响，其适用性仍存在争议。本研究旨在验证单频和多频超声心动图(SF-BIA)和多频心力图(MF-BIA)在评价门诊心力衰竭患者身体成分方面的充分性。方法：在这项横断面研究中，55例稳定性心力衰竭患者，除SF-BIA所评估的脂肪量呈中等相关(r=0.760；P<；0.001)外，其余均为左室射血分数(P<；0.001)。通过Bland-Altman分析，MF-BIA与DEXA在所有测量中也显示出较好的一致性。然而，除去脂体重的MF-BIA外，两种仪器均显示出较宽的一致性范围和方差与偏差之间的显著关系(P>；0.05)。结论：与DEXA相比，MF-BIA显示出比SF-BIA更高的准确度，虽然两种类型的仪器显示出较大的一致性范围。BIA技术应谨慎使用，回归方程可能有助于纠正观察到的变化，主要是在身体成分的极端值。
Background: The utilisation of bioelectrical impedance analysis (BIA) in heart failure can be affected by many factors and its applicability remains controversial. The present study aimed to verify the adequacy of single-frequency BIA (SF-BIA) and multifrequency BIA (MF-BIA) compared to dual-energy x-ray absorptiometry (DEXA) for evaluating body composition in outpatients with heart failure.Methods: In this cross-sectional study, 55 patients with stable heart failure and left ventricle ejection fraction 0.8; P < 0.001), except for fat mass assessed by SF-BIA, which showed a moderate correlation (r = 0.760; P < 0.001). MF-BIA also showed a better agreement with DEXA by Bland-Altman analysis in all measurements. However, both types of equipment showed wide limits of agreement and a significant relationship between variance and bias (Pitmans's test P > 0.05), except MF-BIA for fat-free mass.Conclusions: Compared with DEXA, MF-BIA showed better accuracy than SF-BIA, although both types of equipment showed wide limits of agreement. The BIA technique should be used with caution, and regression equations might be useful for correcting the observed variations, mainly in extreme values of body composition.