对生物阻抗光谱仪器的评估:对金铜电极进行比较研究和错误分析
Sebastian Mussnig1,2, Simon Krenn3, Manfred Hecking1,2
1Medical University of Vienna, Department of Medicine III, Division for Nephrology and Dialysis, Vienna, Austria.
Physiological measurement
|January 18, 2024
概括
生物阻抗光谱 (BIS) 装置显示了同等的电阻测量,但在人体组成估计上有所不同. 在手腕对手腕设置中的可重复使用电极在安全的临床使用中存在太多的变化.
科学领域:
- 生物医学工程 生物医学工程
- 生理测量生理测量
- 身体组成分析 身体成分分析
背景情况:
- 生物阻抗光谱 (BIS) 通过使用频率依赖的电阻来非侵入性地评估流体体积区.
- 细胞外电阻 (R0) 和细胞内电阻 (Ri) 是从BIS测量中得出的关键参数.
- 具有可重复使用电极的新型BIS设备需要与已建立的系统进行验证.
研究的目的:
- 为了比较新型BIS设备与可重复使用的电极与已建立的BIS系统的等价性.
- 用测试盒和体内测量在健康志愿者中评估BIS设备的性能.
- 评估电极类型 (可重复使用与一次性使用) 和测量配置 (手腕至脚与手腕至手腕) 对准确性的影响.
主要方法:
- 两个BIS设备 (Cella和身体组成监测器 (BCM)) 使用四个电阻测试盒进行了比较.
- 在体内验证涉及40名健康志愿者,他们进行了仰卧的手腕到脚 (WA) 和手腕到手腕 (WW) 测量.
- 使用预凝的银/银化物 (Ag/AgCl) 和可重复使用的金铜电极的比较.
主要成果:
- 这两种BIS设备在测试箱测量中都实现了<1%的变化系数.
- 在体内,WA-BIS测量在两个BIS设备之间有显著差异 (p<0.001).
- 与Ag/AgCl电极相比,可重复使用的WW电极显示出明显更大的电阻和更高的相对误差.
结论:
- 虽然这两种BIS设备都能产生同等的阻力测量,但它们产生不同的身体组成估计值.
- 这些设备在临床身体组成评估中是不可互换的.
- 可重复使用的WW电极的测量变化超过了安全的临床限制,需要进一步研究电极材料和电流路径效应.
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