Title :
Continuous Measurement of Calf Resistivity in Hemodialysis Patients using Bioimpedance Analysis
Author :
Zhu, Feida ; Leonard, Edward F. ; Carter, M. ; Levin, N.W.
Author_Institution :
Renal Res. Inst., New York, NY
fDate :
Aug. 30 2006-Sept. 3 2006
Abstract :
This study demonstrates a technique to measure electrical resistivity of the calf in hemodialysis (HD) patients during HD treatment. To continuously monitor and calculate resistivity, a model of calf volume based on its geometrical size and measurement of its electrical resistance has been developed. The model makes it possible to continuously estimate reduction of the calf circumference during HD. Seventeen HD patients were studied during HD using a multi-frequency bioimpedance device (Xitron 4200). Circumference of the calf was measured by a measuring tape pre- and post- HD for each treatment. Results showed a high correlation between measurement and calculation circumference in post HD (r2=0.985). Further, the value of resistivity normalized by body mass index (BMI) provides information about patients´ hydration state in comparison to those in healthy subjects. This technique is useful for identifying the range of optimal hydration states for HD patients
Keywords :
bioelectric phenomena; biomedical measurement; electric resistance measurement; electrical resistivity; kidney; patient monitoring; patient treatment; skin; Xitron 4200; body mass index; calf circumference measurement; calf electrical resistivity measurement; calf volume; continuous monitoring; geometrical size; hemodialysis treatment; multi-frequency bioimpedance device; optimal hydration states; Bioimpedance; Conductivity; Electric resistance; Electric variables measurement; Electrical resistance measurement; High definition video; Medical treatment; Patient monitoring; Solid modeling; Volume measurement; Bioimpedance; body fluid; circumference; dry weight; resistivity;
Conference_Titel :
Engineering in Medicine and Biology Society, 2006. EMBS '06. 28th Annual International Conference of the IEEE
Conference_Location :
New York, NY
Print_ISBN :
1-4244-0032-5
Electronic_ISBN :
1557-170X
DOI :
10.1109/IEMBS.2006.260156
