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胸部电阻抗体积描记法已成功地用于监护胸部疾患,并证实急性肺水肿时因胸内积液量的变化而有胸部电阻抗(TEI)的改变。但以往各种测定方法,只有预知患者发病前的TEI时才能定量或半定量。为了预测无疾病时的TEI,作者提出如下方法。作者认为人体胸骨剑突和腋窝水平线之间为一近似圆柱体,其横切面并非圆形而是椭圆形,其长短轴比值为常数(r)。用V_(th)=rL(P_1+P_2)~2/4π(1+r)~2可得此圆柱体的
Chest electrical impedance plethysmography has been successfully used to monitor chest conditions and to demonstrate changes in chest electrical impedance (TEI) due to changes in intrathoracic fluid volume during acute pulmonary edema. However, in the past a variety of measurement methods, only the prognosis of patients before the onset of TEI can be quantitative or semi-quantitative. In order to predict TEI without disease, the authors propose the following method. The authors believe that the human body between the xiphoid and axilla horizontal line is an approximate cylinder, the cross section is not circular but oval, the ratio of its long axis to short axis is a constant (r). This cylinder can be obtained by using V th = rL P 1 + P 2 ~ 2 / 4π (1 + r) ~ 2