Med Biol Eng Comput - Model-based correction of the influence of body position on continuous segmental and hand-to-foot bioimpedance measurements.

Tópicos

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Resumo

Bioimpedance spectroscopy (BIS) is suitable for continuous monitoring of body water content. The combination of body posture and time is a well-known source of error, which limits the accuracy and therapeutic validity of BIS measurements. This study evaluates a model-based correction as a possible solution. For this purpose, an 11-cylinder model representing body impedance distribution is used. Each cylinder contains a nonlinear two-pool model to describe fluid redistribution due to changing body position and its influence on segmental and hand-to-foot (HF) bioimpedance measurements. A model-based correction of segmental (thigh) and HF measurements (Xitron Hydra 4200) in nine healthy human subjects (following a sequence of 7 min supine, 20 min standing, 40 min supine) has been evaluated. The model-based compensation algorithm represents a compromise between accuracy and simplicity, and reduces the influence of changes in body position on the measured extracellular resistance and extracellular fluid by up to 75 and 70%, respectively.

Resumo Limpo

bioimped spectroscopi bis suitabl continu monitor bodi water content combin bodi postur time wellknown sourc error limit accuraci therapeut valid bis measur studi evalu modelbas correct possibl solut purpos cylind model repres bodi imped distribut use cylind contain nonlinear twopool model describ fluid redistribut due chang bodi posit influenc segment handtofoot hf bioimped measur modelbas correct segment thigh hf measur xitron hydra nine healthi human subject follow sequenc min supin min stand min supin evalu modelbas compens algorithm repres compromis accuraci simplic reduc influenc chang bodi posit measur extracellular resist extracellular fluid respect

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