Non-invasive assessment of fluid volume status in the interstitium after haemodialysis
2000 (English)In: Physiological Measurement, ISSN 0967-3334, E-ISSN 1361-6579, Vol. 21, no 2, 211-220 p.Article in journal (Refereed) Published
During dialysis excess fluid is removed from uraemic patients. The excess fluid is mainly located in the skin and subcutaneous tissues. In this study we wished, with two non-invasive techniques, the IM (impression method) and BIA (bioimpedance analysis), to study what mechanical (IM) and electrical cellular membrane (BIA) effects the fluid withdrawal has on these tissues. The IM measures the resistive force of the tissues when mechanically compressed. From the force curve two parameters are calculated, the F(0), indicative of interstitial tissue pressure and the FT corresponding to the translocation of tissue fluid (interstitial movable water).
The BIA phase angle shift (), i.e. geometrical angular transformation of the ratio between reactance and resistance, which has been associated with cellular membrane function, was used as a measurement of electrical cellular membrane effects.
Twenty patients were studied before and after haemodialysis measuring the F(0), FT and . The results showed that the patients lost a median of 3.7 kg during the haemodialysis. F(0) increased until after dialysis, but did not reach significant values, whereas FT increased significantly after dialysis, p < 0.001, as compared with before. After a peak at one hour postdialysis the FT value returned to predialysis values at four hours after termination of dialysis. Also increased from before to after dialysis, p < 0.001, but already after one hour it returned to predialysis values.
It is common knowledge that dialysis alters the dynamics of fluid in the interstitium of the skin and subcutis. We conclude that the impression method is sensitive enough to detect and chronicle these changes. Furthermore, with the BIA, (phase angle) signs of changes in the electrical properties of the tissues, possibly reflecting cellular membrane function, could be detected.
Place, publisher, year, edition, pages
2000. Vol. 21, no 2, 211-220 p.
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-47661DOI: 10.1088/0967-3334/21/2/301OAI: oai:DiVA.org:liu-47661DiVA: diva2:268557