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Knee-to-knee bioimpedance measurements to monitor changes in extracellular fluid in haemodynamic-unstable patients during dialysis Cover

Knee-to-knee bioimpedance measurements to monitor changes in extracellular fluid in haemodynamic-unstable patients during dialysis

Journal of Electrical Bioimpedance
Volume 10 (2019): Issue 1 (January 2019)
By: Abdul Hamid Ismail,  Georg Schlieper,  Marian Walter,  Jürgen Floege and  Steffen Leonhardt  
Open Access
|Aug 2019

Figures & Tables

Fig.1

Position of the electrodes for (a) the whole-body BIS (whBIS) and (b) knee-to-knee BIS (kkBIS) measurements. Four electrodes were used for each of the BIS methods, i.e. two for current injection I(t) and two for voltage sensing V(t).
Position of the electrodes for (a) the whole-body BIS (whBIS) and (b) knee-to-knee BIS (kkBIS) measurements. Four electrodes were used for each of the BIS methods, i.e. two for current injection I(t) and two for voltage sensing V(t).

Fig.2

Relationship of relative changes in different BIS parameters estimated on basis of pre-HD and post-HD values from kkBIS and whBIS methods. The relative changes were calculated as (|pre-HD – post-HD|)/pre-HD x 100 for (a) ΔRe (%), (b) ΔRe/UFV (%/L), (c) ΔECF (%) and (d) ΔECF (%) according to [15, 16]. Each patient has two entries.
Relationship of relative changes in different BIS parameters estimated on basis of pre-HD and post-HD values from kkBIS and whBIS methods. The relative changes were calculated as (|pre-HD – post-HD|)/pre-HD x 100 for (a) ΔRe (%), (b) ΔRe/UFV (%/L), (c) ΔECF (%) and (d) ΔECF (%) according to [15, 16]. Each patient has two entries.

Fig.3

Graphs showing the trends (mean±SD) in the patient groups for (a) relative change in knee-to-knee extracellular resistance (ΔRe,kkBIS), (b) relative change in total body extracellular resistance (ΔRe,whBSI), both normalized by UFV (removed during the corresponding time interval), (c) the ratio of ΔRe,kkBIS to ΔRe,whBIS, and (d) the relative changes in extracellular fluid (ΔECF, %) measured by kkBIS and whBIS during the time course of the treatment.
Graphs showing the trends (mean±SD) in the patient groups for (a) relative change in knee-to-knee extracellular resistance (ΔRe,kkBIS), (b) relative change in total body extracellular resistance (ΔRe,whBSI), both normalized by UFV (removed during the corresponding time interval), (c) the ratio of ΔRe,kkBIS to ΔRe,whBIS, and (d) the relative changes in extracellular fluid (ΔECF, %) measured by kkBIS and whBIS during the time course of the treatment.

Fig.4

Pre-HD to post-HD comparison of (a-b) relative changes in Re,kkBIS (%) and Re,whBIS (%), respectively, with changes of patient weight (%). Pre-HD to post-HD comparison of (c-d) changes in ΔECFkkBIS (L) or ΔECFwhBIS (L), respectively, with cumulative ultrafiltration volume (UFV, L). Each patient has two entries.
Pre-HD to post-HD comparison of (a-b) relative changes in Re,kkBIS (%) and Re,whBIS (%), respectively, with changes of patient weight (%). Pre-HD to post-HD comparison of (c-d) changes in ΔECFkkBIS (L) or ΔECFwhBIS (L), respectively, with cumulative ultrafiltration volume (UFV, L). Each patient has two entries.

Fig.5

Data (mean ± SD) showing the accumulative changes in extracellular fluid (ECF) associated with accumulative ultrafiltration volume (UFV) as recorded by the dialysis machine during treatment at the time points 30, 60, 90, 120,150 and 180 min from the start of dialysis. SD lines were omitted from the graph to maintain visual clarity.
Data (mean ± SD) showing the accumulative changes in extracellular fluid (ECF) associated with accumulative ultrafiltration volume (UFV) as recorded by the dialysis machine during treatment at the time points 30, 60, 90, 120,150 and 180 min from the start of dialysis. SD lines were omitted from the graph to maintain visual clarity.

Pre-dialysis physical and clinical characteristics_ Data are means ± SD from 20 patients (40 measurements)_

Baseline CharacteristicsHemodialysispatients
Stable (n = 10)Unstable (n = 10)p
Gender, % female20.050.00.350
Age, years63.3 ± 15.860.7 ± 16.40.722
Height, cm174.7 ± 7.9165.8 ± 9.00.030
Weight, kg83.6 ± 8.369.5 ± 17.30.038
BMI, Kg / m227.5 ± 3.425.4 ± 6.80.398
Dialysis duration, min234.0 ± 19.0222.0 ± 29.00.290
Ultrafiltration Rate, ml / h557.5 ± 305.7564.2 ± 235.10.957
UFV, mL2252.0 ± 1226.92300.0 ± 1091.40.927
SysBP, mmHg123.7 ± 17.2125.4 ± 19.10.836
DiaBP, mmHf71.5 ± 14.664.1 ± 11.60.226
ECFwhBIS, L21.6 ± 2.417.3 ± 3.90.009
ECFkkBIS, L2.7 ± 0.52.6 ± 0.70.769
Body temperature, °C36.0 ± 0.635.9 ± 0.40.688
O2 saturation, %96.9 ± 2.496.6 ± 2.70.796
Plasma Na+, mmol / L136.8 ± 2.1136.7 ± 2.70.928
Plasma K+, mmol / L4.4 ± 0.74.7 ± 1.00.530
Plasma ionized Ca2+, mmol / L1.1 ± 0.11.1 ± 0.10.461
Plasma glucose, mmol / L121.4 ± 27.8124.6 ± 31.30.809
DOI: https://doi.org/10.2478/joeb-2019-0008 | Journal eISSN: 1891-5469
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Language: English
Page range: 55 - 62
Submitted on: Mar 25, 2019
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Published on: Aug 20, 2019
Published by: University of Oslo
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year
Keywords:
Bioimpedance,
hemodialysis,
intradialytic hypotension
Related subjects:
Engineering,
Bioengineering and biomedical engineering,
Biomedical electronics,
Life sciences,
Biophysics,
Medicine,
Biomedical engineering,
Physics,
Spectroscopy and metrology

© 2019 Abdul Hamid Ismail, Georg Schlieper, Marian Walter, Jürgen Floege, Steffen Leonhardt, published by University of Oslo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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