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Reproducibility of hemodynamic measurements by impedance cardiography



Reproducibility of hemodynamic measurements by impedance cardiography



Cardiovascular Research 17(12): 728-734



Impedance cardiography was used to measure heart rate (HR), stroke index (SI), cardiac index (CI) and left ventricular ejection time (t) in 4 subjects at rest and in 8 [human] subjects anticipating exercise and working at loads of 49, 98 and 147 W on a bicycle ergometer. The resting measurements were repeated 5 times over a 2 wk period and the exercise measurements were repeated 3 times at weekly intervals. Analysis of variance testing indicated that none of the variables changed significantly from day to day (P > 0.1). All variables changed with exercise and all but t changed from subject to subject (P < 0.01). Coefficients of variation for CI, SI, HR and t were 10, 12, 8 and 1%, respectively, at rest and rose to 16, 13, 5 and 6% during exercise. There was a high linear correlation between work load and CI (r = 0.96). Evidently, noninvasive impedance cardiography can be used to obtain reproducible measurements of CI, SI, HR and t during rest and immediately after exercise. [The use of this method in assessing a variety of cardiac disease states is discussed.].

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Accession: 006315184

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PMID: 6661744


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