Keim H J, Wallace J M, Thurston H, Case D B, Drayer J I, Laragh J H
J Appl Physiol. 1976 Nov;41(5 Pt. 1):797-9. doi: 10.1152/jappl.1976.41.5.797.
Stroke index obtained by impedance cardiography was compared with values obtained by dye-dilution technique in 17 subjects in 122 determinations made within 2 min of each other. Fifty of these determinations were done after drug administration, postural change, or saline infusion. All values obtained by both methods correlated significantly, but with wide scatter (r=0.49, n = 122, P less than 0.001). The series of determinations within each subject, however, correlated only in one subject significantly; thus any changes of stroke index measured by both techniques were not commensurate. In addition, the impedance stroke index values were significantly lower than the dye-dilution technique, impedance cardiography presently does not determine reliably absolute values of stroke index and is not suitable to evaluate changes of stroke index.
在17名受试者中，将通过阻抗心动描记术获得的每搏输出量指数与通过染料稀释技术在彼此2分钟内进行的122次测定中获得的值进行比较。其中50次测定是在给药、体位改变或输注生理盐水后进行的。两种方法获得的所有值均显著相关，但离散度较大（r = 0.49，n = 122，P < 0.001）。然而，每个受试者内的一系列测定仅在一名受试者中显著相关；因此，两种技术测量的每搏输出量指数的任何变化都不相符。此外，阻抗每搏输出量指数值显著低于染料稀释技术，目前阻抗心动描记术不能可靠地确定每搏输出量指数的绝对值，也不适合评估每搏输出量指数的变化。
