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Frequency characteristics of the electrical conductivity in normal and coagulated blood

  • M. Noshiro
  • S. Nebuya
  • A. Fujimaki
  • R. Smallwood
  • B.H. Brown
Part of the IFMBE Proceedings book series (IFMBE, volume 17)

Abstract

The electrical conductivity and phase shift of normal and coagulated blood sampled from 10 pigs were measured using an LCR meter, Agilent 4285A. The hematocrit of normal blood was also measured. The conductivity difference between normal and coagulated blood remained at 4.3 mS/cm up to 800 kHz, and then gradually decreased. The conductivity difference was not correlated with the hematocrit (correlation coefficient = 0.04). The phase difference between normal and coagulated blood reached the maximum, -13.5 degree, between 1 and 2 MHz. Therefore, it is possible to discriminate thrombi from air emboli using the phase difference at the frequency range of 1 to 2 MHz.

Keywords

Phase Difference Impedance Change Agilent 4285A Electrical Impedance Measurement Conductivity Difference 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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    Nebuya S, Brown BH et al. (1999) Measurement of high frequency electrical transfer impedances from biological tissues. Electron Let 35-23:1–2Google Scholar
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    Nebuya S, Noshiro M et al. (2004) Estimation of the size of air emboli detectable by electrical impedance measurement. Med & Biol Eng & Comput 42:142-144CrossRefGoogle Scholar
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    Nebuya S, Noshiro M et al. (2006) Detection of emboli in vessels using electrical impedance measurements – phantom and electrodes. Physiol Meas 26:S111-S118CrossRefGoogle Scholar
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    Geselowitz DB (1971) An application of electrocardiographic lead theory to impedance plethysmography. IEEE Trans Bio-med Eng 18:38-41Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2007

Authors and Affiliations

  • M. Noshiro
    • 1
  • S. Nebuya
    • 1
  • A. Fujimaki
    • 1
  • R. Smallwood
    • 2
  • B.H. Brown
    • 3
  1. 1.Department of Clinical EngineeringKitasato UniversitySagamiharaJapan
  2. 2.Department of Computer ScienceUniversity of SheffieldSheffieldUK
  3. 3.Department of Medical PhysicsUniversity of SheffieldSheffieldUK

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