Do Bioimpedance Measurements of Over-Hydration Accurately Reflect Post-Haemodialysis Weight Changes?
Introduction: Bioelectrical impedance spectroscopy (BIS) devices are being used to determine ultrafiltration requirements to achieve target weight for haemodialysis (HD) patients. Pre-dialysis measurements are more convenient for both patients and staff. We wished to compare the changes in pre- and...
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description | Introduction: Bioelectrical impedance spectroscopy (BIS) devices are being used to determine ultrafiltration requirements to achieve target weight for haemodialysis (HD) patients. Pre-dialysis measurements are more convenient for both patients and staff. We wished to compare the changes in pre- and post-dialysis hydration measured by BIS with actual weight loss. Methods: We compared paired BIS measurements made pre and post HD using a BIS device based on a 3-compartmental model, designed to provide information on extracellular water (ECW) excess. Results: BIS was measured in 49 HD patients, 35 male (71.4%) with mean age 67.6 ± 14.2. Weight fell significantly from 69.2 ± 17.8 to 67.6 ± 17.4 kg, and BIS over hydration (OH) from 4.5 ± 3.3.4 to 3.4 ± 2.9 litres, and ECW from 16.8 ± 4.8 to 15.5 ± 4.4 litres, but there was no change in the amount of intracellular water. Weight loss correlated positively with the change in ECW, but exceeded the fall in OH; mean bias -0.58 (95% confidence limits -3.6 to 4.8 kg). Summary: We measured OH pre and post HD, but did not find that the change in OH correlated with changes in body weight. Although there was a correlation between changes in OH and ECW, there was none for weight. Our findings do not support total reliance on pre-dialysis BIS alone for assessing volume status in HD patients, but rather BIS should be considered an aid to clinical assessment of volume status. |
doi_str_mv | 10.1159/000447702 |
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Pre-dialysis measurements are more convenient for both patients and staff. We wished to compare the changes in pre- and post-dialysis hydration measured by BIS with actual weight loss. Methods: We compared paired BIS measurements made pre and post HD using a BIS device based on a 3-compartmental model, designed to provide information on extracellular water (ECW) excess. Results: BIS was measured in 49 HD patients, 35 male (71.4%) with mean age 67.6 ± 14.2. Weight fell significantly from 69.2 ± 17.8 to 67.6 ± 17.4 kg, and BIS over hydration (OH) from 4.5 ± 3.3.4 to 3.4 ± 2.9 litres, and ECW from 16.8 ± 4.8 to 15.5 ± 4.4 litres, but there was no change in the amount of intracellular water. Weight loss correlated positively with the change in ECW, but exceeded the fall in OH; mean bias -0.58 (95% confidence limits -3.6 to 4.8 kg). Summary: We measured OH pre and post HD, but did not find that the change in OH correlated with changes in body weight. Although there was a correlation between changes in OH and ECW, there was none for weight. Our findings do not support total reliance on pre-dialysis BIS alone for assessing volume status in HD patients, but rather BIS should be considered an aid to clinical assessment of volume status.</description><identifier>ISSN: 1660-8151</identifier><identifier>EISSN: 2235-3186</identifier><identifier>DOI: 10.1159/000447702</identifier><identifier>PMID: 27505163</identifier><identifier>CODEN: NPRNAY</identifier><language>eng</language><publisher>Basel, Switzerland: S. Karger AG</publisher><subject>Aged ; Aged, 80 and over ; Body Fluids ; Body Weight ; Clinical Practice: Original Paper ; Electric Impedance ; Humans ; Middle Aged ; Renal Dialysis</subject><ispartof>Nephron, 2016-01, Vol.133 (4), p.247-252</ispartof><rights>2016 S. Karger AG, Basel</rights><rights>2016 S. Karger AG, Basel.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c369t-1a70bec4e1b7095c9889d9d18dcd7d303a66394b3170894660da14f7ccff60013</citedby><cites>FETCH-LOGICAL-c369t-1a70bec4e1b7095c9889d9d18dcd7d303a66394b3170894660da14f7ccff60013</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,2422,27903,27904</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/27505163$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Tangvoraphonkchai, Kamonwan</creatorcontrib><creatorcontrib>Davenport, Andrew</creatorcontrib><title>Do Bioimpedance Measurements of Over-Hydration Accurately Reflect Post-Haemodialysis Weight Changes?</title><title>Nephron</title><addtitle>Nephron</addtitle><description>Introduction: Bioelectrical impedance spectroscopy (BIS) devices are being used to determine ultrafiltration requirements to achieve target weight for haemodialysis (HD) patients. Pre-dialysis measurements are more convenient for both patients and staff. We wished to compare the changes in pre- and post-dialysis hydration measured by BIS with actual weight loss. Methods: We compared paired BIS measurements made pre and post HD using a BIS device based on a 3-compartmental model, designed to provide information on extracellular water (ECW) excess. Results: BIS was measured in 49 HD patients, 35 male (71.4%) with mean age 67.6 ± 14.2. Weight fell significantly from 69.2 ± 17.8 to 67.6 ± 17.4 kg, and BIS over hydration (OH) from 4.5 ± 3.3.4 to 3.4 ± 2.9 litres, and ECW from 16.8 ± 4.8 to 15.5 ± 4.4 litres, but there was no change in the amount of intracellular water. Weight loss correlated positively with the change in ECW, but exceeded the fall in OH; mean bias -0.58 (95% confidence limits -3.6 to 4.8 kg). Summary: We measured OH pre and post HD, but did not find that the change in OH correlated with changes in body weight. Although there was a correlation between changes in OH and ECW, there was none for weight. Our findings do not support total reliance on pre-dialysis BIS alone for assessing volume status in HD patients, but rather BIS should be considered an aid to clinical assessment of volume status.</description><subject>Aged</subject><subject>Aged, 80 and over</subject><subject>Body Fluids</subject><subject>Body Weight</subject><subject>Clinical Practice: Original Paper</subject><subject>Electric Impedance</subject><subject>Humans</subject><subject>Middle Aged</subject><subject>Renal Dialysis</subject><issn>1660-8151</issn><issn>2235-3186</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNpd0E1vEzEQBmALUdGo9MAdIUtc6GGpx_b644TSFEilVEEIxHHl2LPplt11au8i5d-zVUIOnGYOz4xmXkLeAPsIUNprxpiUWjP-gsw4F2UhwKiXZAZKscJACefkMufHiXEBwgr5ipxzXbISlJiRcBvpTRObbofB9R7pPbo8JuywHzKNNV3_wVQs9yG5oYk9nXs_Ti22e_od6xb9QL_FPBRLh10MjWv3ucn0Fzbbh4EuHly_xfzpNTmrXZvx8lgvyM8vn38slsVq_fVuMV8VXig7FOA026CXCBvNbOmtMTbYACb4oINgwiklrNwI0MxYOf0XHMhae1_XijEQF-TDYe8uxacR81B1TfbYtq7HOOYKDEhluORmou__o49xTP103bNSQnJu9KSuDsqnmHPCutqlpnNpXwGrntOvTulP9t1x47jpMJzkv6wn8PYAfru0xXQCx_m_VdeGlg</recordid><startdate>20160101</startdate><enddate>20160101</enddate><creator>Tangvoraphonkchai, Kamonwan</creator><creator>Davenport, Andrew</creator><general>S. 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Pre-dialysis measurements are more convenient for both patients and staff. We wished to compare the changes in pre- and post-dialysis hydration measured by BIS with actual weight loss. Methods: We compared paired BIS measurements made pre and post HD using a BIS device based on a 3-compartmental model, designed to provide information on extracellular water (ECW) excess. Results: BIS was measured in 49 HD patients, 35 male (71.4%) with mean age 67.6 ± 14.2. Weight fell significantly from 69.2 ± 17.8 to 67.6 ± 17.4 kg, and BIS over hydration (OH) from 4.5 ± 3.3.4 to 3.4 ± 2.9 litres, and ECW from 16.8 ± 4.8 to 15.5 ± 4.4 litres, but there was no change in the amount of intracellular water. Weight loss correlated positively with the change in ECW, but exceeded the fall in OH; mean bias -0.58 (95% confidence limits -3.6 to 4.8 kg). Summary: We measured OH pre and post HD, but did not find that the change in OH correlated with changes in body weight. Although there was a correlation between changes in OH and ECW, there was none for weight. Our findings do not support total reliance on pre-dialysis BIS alone for assessing volume status in HD patients, but rather BIS should be considered an aid to clinical assessment of volume status.</abstract><cop>Basel, Switzerland</cop><pub>S. Karger AG</pub><pmid>27505163</pmid><doi>10.1159/000447702</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record> |
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subjects | Aged Aged, 80 and over Body Fluids Body Weight Clinical Practice: Original Paper Electric Impedance Humans Middle Aged Renal Dialysis |
title | Do Bioimpedance Measurements of Over-Hydration Accurately Reflect Post-Haemodialysis Weight Changes? |
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