Tanguy R L, Cadoret Y, Guedes Y, Egreteau J P
Ann Fr Anesth Reanim. 1982;1(1):67-75. doi: 10.1016/s0750-7658(82)80078-6.
The measurement of cardiac output by electrical impedance plethysmography (non invasive technic) seems to be attractive but is still the subject of a certain number of critics. The authors have tried to compare it with a method which validity is well documented, the thermodilution. By these two methods, 87 measures of cardiac output have been performed in 14 hospitalized patients in intensive care, attained of various affections but exempts of cardiac or pulmonary lesions and in stable hemodynamic state. The stroke volume measured by electrical impedance plethysmography is calculated using Kubicek's formula: SV = Q (L2/Zo2) (dz/dt min) t. Results were as follows: absence of significative difference between the coefficients of variation of each series of measures (coefficient of mean variation, 5,6 +/- 3,4 p. cent for impedance and 3,8 +/- 3,2 p. cent for thermodilution); absence of significative difference between the mean values of cardiac output (7,59 +/- 2,69 l . min-1 for impedance and 7,72 +/- 1,99 l . min-1 for thermodilution); highly significant correlation between values for cardiac output obtained for each of these two methods )r = 0,804; n = 87; p less than 0,001). The authors conclude that in patients in intensive care whose pulmonary or cardiovascular system is not in critical situation, the electrical impedance plethysmography appear as a secure method for cardiac output measurement. However its generalisation still require other works.
通过电阻抗体积描记法（非侵入性技术）测量心输出量似乎很有吸引力，但仍受到一些批评。作者试图将其与一种有效性已得到充分证明的方法——热稀释法进行比较。通过这两种方法，对14名入住重症监护病房的住院患者进行了87次心输出量测量，这些患者患有各种疾病，但无心脏或肺部病变，且血流动力学状态稳定。通过电阻抗体积描记法测量的每搏输出量使用库比克公式计算：SV = Q (L2/Zo2) (dz/dt min) t。结果如下：各系列测量的变异系数之间无显著差异（平均变异系数，电阻抗法为5.6±3.4%，热稀释法为3.8±3.2%）；心输出量的平均值之间无显著差异（电阻抗法为7.59±2.69升·分钟-1，热稀释法为7.72±1.99升·分钟-1）；这两种方法所获得的心输出量值之间具有高度显著的相关性（r = 0.804；n = 87；p < 0.001）。作者得出结论，对于肺部或心血管系统无危急情况的重症监护患者，电阻抗体积描记法似乎是一种安全的心输出量测量方法。然而，其推广仍需要其他研究。
