Multifrequency Impedance in the Assessment of Body Water Losses during Dialysis

Lorenzo, Antonino De; Deurenberg, P.; Andréoli, A.; Sasso, G F; Palestini, M; Docimo, R

doi:10.1159/000173865

Cited by 17 publications

(12 citation statements)

References 11 publications

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“…However, there are other indications in the literature that assessment of TBW may not be sufficiently accurate in conditions of change in hydration status and when body compartments are undergoing acute changes [26]. This may be because changes in the ratio of intra- to extra-cellular water, and of acute changes in these compartments, also influence resistivity [26–29]. This may mean that there are fundamental problems with MF-BIA in assessing TBW and so in using MF-BIA in predicting hydration status.…”

Section: Discussionmentioning

confidence: 99%

The diagnostic accuracy of multi-frequency bioelectrical impedance analysis in diagnosing dehydration after stroke

et al. 2013

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BackgroundNon-invasive methods for detecting water-loss dehydration following acute stroke would be clinically useful. We evaluated the diagnostic accuracy of multi-frequency bioelectrical impedance analysis (MF-BIA) against reference standards serum osmolality and osmolarity.Material/MethodsPatients admitted to an acute stroke unit were recruited. Blood samples for electrolytes and osmolality were taken within 20 minutes of MF-BIA. Total body water (TBW%), intracellular (ICW%) and extracellular water (ECW%), as percentages of total body weight, were calculated by MF-BIA equipment and from impedance measures using published equations for older people. These were compared to hydration status (based on serum osmolality and calculated osmolarity). The most promising Receiver Operating Characteristics curves were plotted.Results27 stroke patients were recruited (mean age 71.3, SD10.7). Only a TBW% cut-off at 46% was consistent with current dehydration (serum osmolality >300 mOsm/kg) and TBW% at 47% impending dehydration (calculated osmolarity ≥295–300 mOsm/L) with sensitivity and specificity both >60%. Even here diagnostic accuracy of MF-BIA was poor, a third of those with dehydration were wrongly classified as hydrated and a third classified as dehydrated were well hydrated. Secondary analyses assessing diagnostic accuracy of TBW% for men and women separately, and using TBW as a percentage of lean body mass showed some promise, but did not provide diagnostically accurate measures across the population.ConclusionsMF-BIA appears ineffective at diagnosing water-loss dehydration after stroke and cannot be recommended as a test for dehydration, but separating assessment by sex, and using TBW as a percentage of lean body weight may warrant further investigation.

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Section: Discussionmentioning

confidence: 99%

The diagnostic accuracy of multi-frequency bioelectrical impedance analysis in diagnosing dehydration after stroke

et al. 2013

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“…Different studies have validated the reliability of the measurement of total body water and intra‐ and extracellular water using the bioimpedance technique. It has been shown that multifrequency impedance is able to estimate adequately body water volume when compared with dilution methods.…”

Section: Methods For Assessing Venous Hemodynamics and Plasma Volumementioning

confidence: 99%

“…It consists of glucose and hydroxyethyl glucose that are interconnected by α‐glycosidic bonds. The use of HES as a dilution marker was first proposed in 1994. The HES method for plasma volume estimation has been found to be rapid, safe, well tolerated and acceptable for use in pregnant women, as it does not cross the placenta.…”

Section: Methods For Assessing Venous Hemodynamics and Plasma Volumementioning

confidence: 99%

Assessment of venous hemodynamics and volume homeostasis during pregnancy: recommendations of the International Working Group on Maternal Hemodynamics

Gyselaers

Spaanderman

2018

Ultrasound in Obstet & Gyne

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Venous hemodynamics and volume homeostasis are important aspects of cardiovascular physiology. However, today their relevance is still very much underappreciated. Their most important role is maintenance and control of venous return and, as such, cardiac output. A high-flow/low-resistance circulation, remaining constant under physiological circumstances, is mandatory for an uncomplicated course of pregnancy. In this article, characteristics of normal and abnormal venous and volume regulating functions are discussed with respect to normal and pathologic outcomes of pregnancy, and current (non-invasive) methods to assess these functions are summarized. Copyright © 2017 ISUOG. Published by John Wiley & Sons Ltd.

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“…Recent studies have shown the utility of multiplefrequency bioimpedance in the assessment of fluid state and its changes in patients with sepsis [14] and on maintenance HD [15,16].…”

Section: Introductionmentioning

confidence: 99%