Can tissue dielectric constant measurements assess circulating blood volume changes in patients undergoing haemodialysis

摘要: Background The tissue dielectric constant (TDC) method uses an open-ended coaxial probe to achieve non-invasive measurement of water content in skin. aim our study was test the hypothesis that changes circulating blood volume would be associated with TDC values patients undergoing haemodialysis. Methods In this prospective descriptive study, measurements were performed for three parts body (the face, shin and hand) before after underwent haemodialysis (N = 83). primary outcome measure correlation between amount removal ΔTDC at each site measured (ΔTDC posthaemodialysis TDC-prehaemodialysis TDC). secondary mean difference value Results part significantly reduced haemodialysis, but percentage pre- small hand, %mean ± SE -4.4 0.70, -3.2 0.98 -6.0 1.6; 95 per cent confidence intervals (lower bound upper bound) 3.0-5.8, 1.3-5.2 2.7-9.2; P 0.000, 0.000 respectively. inverse also weak (correlation r -0.25, 0.028; shin, -0.26, 0.018; no significant correlation). Conclusion Our results indicate can used assess local oedema, may unlikely evaluate real-time a clinical setting.