Bracco D, Revelly J P, Berger M M, Chioléro R L
Department of Anesthesiology, University Hospital CHUV, Institute of Physiology, Faculty of Medicine, University of Lausanne, Switzerland.
Crit Care Med. 1998 Jun;26(6):1065-70. doi: 10.1097/00003246-199806000-00029.
Bioelectrical impedance analysis (BIA) is based on the physical property of tissues to conduct electrical currents, impedance being inversely related to tissue fluid content. At high frequency, the electrical current flows across both intracellular and extracellular pathways, making the assessment of fat-free mass possible while a low-frequency current flows through the extracellular space. Similarly, segmental BIA may be used to assess segmental body fluid repartition. The aim of this study was to assess fluid accumulation after cardiac surgery by multiple frequency segmental BIA.
Observational, clinical study.
A 17-bed, surgical intensive care unit in a university hospital.
Twenty-six patients before and after open-heart surgery with cardiopulmonary bypass.
None.
After surgery, fluid accumulation resulted in a decrease in whole-body and segmental bioelectrical impedance in the arm and in the trunk. There was a good correlation between the fluid accumulation measured by fluid balance and by whole-body or segmental impedance changes. The major part (71%) of fluid accumulation occurred in the trunk. Multiple frequency measurements did not indicate a fluid shift between the intra- and extracellular compartments.
Cardiac surgery produced a significant decrease in segmental trunk BIA, reflecting fluid accumulation at the trunk level.
生物电阻抗分析（BIA）基于组织传导电流的物理特性，阻抗与组织液含量呈负相关。在高频时，电流流经细胞内和细胞外路径，从而能够评估去脂体重，而低频电流则流经细胞外空间。同样，节段性BIA可用于评估节段性体液分布。本研究的目的是通过多频节段性BIA评估心脏手术后的液体蓄积情况。
观察性临床研究。
一家大学医院的拥有17张床位的外科重症监护病房。
26例接受体外循环心脏直视手术的患者，术前术后均进行观察。
无。
术后，液体蓄积导致全身及手臂和躯干的节段性生物电阻抗降低。通过液体平衡测量的液体蓄积与通过全身或节段性阻抗变化测量的结果之间存在良好的相关性。液体蓄积的主要部分（71%）发生在躯干。多频测量未显示细胞内和细胞外间隙之间的液体转移。
心脏手术导致节段性躯干BIA显著降低，反映了躯干水平的液体蓄积。
