Impedance ratio method for urine conductivity-invariant estimation of bladder volume

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Abstract

Non-invasive estimation of bladder volume could help patients with impaired bladder volume sensation to determine the right moment for catheterisation. Continuous, non-invasive impedance measurement is a promising technology in this scenario, although influences of body posture and unknown urine conductivity limit wide clinical use today. We studied impedance changes related to bladder volume by simulation, in-vitro and in-vivo measurements with pigs. In this work, we present a method to reduce the influence of urine conductivity to cystovolumetry and bring bioimpedance cystovolumetry closer to a clinical application.

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Schlebusch, T., Orschulik, J., Malmivuo, J., Leonhardt, S., Leonhäuser, D., Grosse, J., … Walter, M. (2014). Impedance ratio method for urine conductivity-invariant estimation of bladder volume. Journal of Electrical Bioimpedance, 5(1), 48–54. https://doi.org/10.5617/jeb.895

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