Abstract

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Title:: A study on the characterization method of PELs velocity in the closed flow cell based on electrical impedance parameters

Author(s):: MA Jieshi1; ZHOU Deqiang1; ZHANG Hehua1; YAN Lexian1; Chong Yinbao2; 1. Daping Hospital, Army Medical University, Chongqing, 400042, China 2. The Second Affiliated Hospital, Army Medical University, Chongqing, 400037, China

Keywords:: hemorrhagic shock electrical impedance pulse flowing liquid velocity spectrum analysis

Abstract:: Abstract: Objective To characterize the velocity of pulse flowing liquid (PFL) with electrical impedance parameters of PFL flowing in the closed flow cell (CFC). Methods The waveforms of the FPLs electrical impedance moduli in a CFC were measured by a sophisticated impedance analyzer at five levels of infusion rate. The obtained electrical impedance waveforms were subjected to spectrum analysis, and the dominant frequency of the spectrum of each electrical impedance waveforms was calculated. The difference of each dominant frequency was analyzed corresponding to the five flow rates. The correlation between the PFLs velocity and its corresponding dominant frequency in spectrum of the electrical impedance waveforms was determined by the correlation analysis and curve estimation. Results Both the visual determination and the statistical analysis indicated that the dominant frequency of the PFL in the spectrum of electrical impedance waveforms increases with the increase of its flow velocity (P<0.05). The velocity of the PFL was correlated well with the dominant frequency in spectrums of the electrical impedance waveforms (r=0.99, P<0.05). The two were in a binomial relationship: y=-0.001 2x2+0.176 9x-0.134, R2=0.999 8. Conclusion The velocity of PFL through the CFC could be characterized by the electrical impedance parameter of the PFL.