Secher N J, Thomsen A, Arnsbo P
Acta Anaesthesiol Scand. 1977;21(5):353-8. doi: 10.1111/j.1399-6576.1977.tb01231.x.
One hundred and twenty-nine simultaneous measurements were carried out on seven patients, 67 at rest and 62 during the Valsalva manoeuvre, in order to compare impedance cardiography with the thermodilution method, during rapid changes in cardiac stroke volume and pulmonary blood volume. A coefficient of correlation of 0.86 was found following linear regression analysis of the whole material. Analysis of the individual patient showed that the mean coefficient of correlation was 0.94 (range 0.91-0.97), and that the slope of the regression lines was 0.41 to 1.82, and further that the mean intercept was 0.2 ml. It is concluded that impedance cardiography can be employed for measuring the relative intraindividual changes in cardiac stroke volume during the Valsalva manoeuvre, and it is suggested that it may be of use in other situations, such as during haemorrhage or continuous positive pressure ventilation.
为了在心脏每搏输出量和肺血容量快速变化期间，将阻抗心动图与热稀释法进行比较，对7名患者进行了129次同步测量，其中67次在静息状态下进行，62次在瓦尔萨尔瓦动作期间进行。对全部数据进行线性回归分析后，发现相关系数为0.86。对个体患者的分析表明，平均相关系数为0.94（范围为0.91 - 0.97），回归线的斜率为0.41至1.82，平均截距为0.2毫升。得出的结论是，阻抗心动图可用于测量瓦尔萨尔瓦动作期间心脏每搏输出量的相对个体内变化，并建议其可能在其他情况下有用，例如在出血或持续正压通气期间。
