摘要
介绍了基于电阻抗法的无拘束心输出量(CO)检测技术与原理。利用开发的多通道电阻抗分布检测装置,对采用点状电极进行无拘束CO检测时胸部圆柱模型的适应性进行了实验研究,阐述了用点状电极替代带状电极进行无创性CO检测的关键因素,探讨了胸部正中线上6个检测电极检测到的从锁骨位置到剑凸位置电阻抗的波动部分(ΔZ)波形大小的变化规律及其两种典型的分布模式,分析了采用点状电极进行无拘束CO测量时胸部圆柱模型的适用性。综合实验结果中得到的胸廓正中附近血液泵出时所引起的ΔZ分布规律和变化模式,得出当采用点状电极检测无创性CO时,检测用电极的黏附位置以锁骨中央—乳首位置更为适合的结论。
The principle of ambulatory cardiac output （CO） measuring technique is introduced in this paper. Experimental studies about the applicability of the two-compartment coaxial cylindrical model for ambulatory measurement of cardiac output with spot-electrodes have been carried out with using our newly-developed multi-channel impedance mapping system. The key factors using a spot-electrode array instead of a conventional band-electrode array for non- invasive CO measurement are elaborated. The variations of the electric impedance pulsatile component （AZ waveform） and the two kinds of typical modes of AZ distributions measured by six electrodes on the midsternal （midian） line from the medial portion at the level of clavicle to the portion above the xiphisternum are discussed. The applica- bility of the two-compartment coaxial cylindrical model for ambulatory measurement of CO with spot-electrodes is analyzed. Synthesizing the AZ distributions and their typical changing models on the midsternal （midian） line during blood inflowing into aorta is the optimal positions of a pair of spot-electrodes for voltage pick-up at the level of clavicle for the upper electrode and the position at the level of nipple for the lower electrode when spot-electrode is being used to measure non-invasive CO.
出处
《生物医学工程学杂志》
EI
CAS
CSCD
北大核心
2013年第4期684-691,共8页
Journal of Biomedical Engineering
基金
国家人事部高层次留学人才回国工作资助项目(国人厅发[2007]171号)
关键词
心输出量
生物阻抗法
胸部圆柱模型
点状电极
Cardiac output（CO）
Bio-electrical impedance method
Thorax cylindrical model
Spot-electrode
