A comparison between the transthoracic electrical impedance method and the direct Fick and the dye dilution methods for cardiac output measurements in man.

In fourteen patients referred for preoperative evaluation of heart disease we compared the transthoracic electrical impedance method to the direct Fick (four patients) and dye dilution methods (ten patients) for estimation of cardiac output. On statistical analysis of paired differences we found no reliable agreement between the absolute impedance values and the reference methods. The reproducibility was, however, acceptable, and the coefficient of variation for impedance cardiac output was 7.8%, and for impedance stroke volume 7.6%. Our conclusion is that in patients with advanced heart disease cardiac output cannot be determined with accuracy with the impedance cardiographic method. In clinical practice this must be considered so important, that we hesitate to use the method for monitoring cardiac output in critically ill patients even if the reproducibility for individual changes is acceptable.

[1]  H Thurston,et al.  Impedance cardiography for determination of stroke index. , 1976, Journal of applied physiology.

[2]  T. Ryan,et al.  Accuracy of the stroke index as determined by the transthoracic electrical impedance method. , 1975, Anesthesiology.

[3]  J. Atterhög,et al.  Measurement of cardiac output by impedance cardiography in patients with myocardial infarction. Comparative evaluation of impedance and dye dilution methods. , 1976, Scandinavian journal of clinical and laboratory investigation.

[4]  P. Bier,et al.  [The noninvasive determination of cardiac output by means of impedance cardiography. Comparative evaluation with a thermal dilution technique (author's transl)]. , 1976, Basic research in cardiology.

[5]  P. Arnsbo,et al.  Measurement of Rapid Changes in Cardiac Stroke Volume. An Evaluation of the Impedance Cardiography Method , 1977, Acta anaesthesiologica Scandinavica.

[6]  R. Lauer,et al.  Evaluation of impedance cardiac output in children. , 1971, Pediatrics.

[7]  L. Geddes,et al.  The specific resistance of canine blood at body temperature. , 1973, IEEE transactions on bio-medical engineering.

[8]  Bishop Jm,et al.  Relationships between cardiac output and rhythm, pulmonary vascular pressures and disability in mitral stenosis. , 1963 .

[9]  J. Maher,et al.  Measurement of cardiac output by electrical impedance at rest and during exercise. , 1976, Journal of applied physiology.

[10]  M. Farber,et al.  Intradialytic measurement of cardiac output by thermodilution and impedance cardiography. , 1977, Clinical nephrology.

[11]  R. Patterson,et al.  IMPEDANCE CARDIOGRAPHY AS A NONINVASIVE METHOD OF MONITORING CARDIAC FUNCTION AND OTHER PARAMETERS OF THE CARDIOVASCULAR SYSTEM * , 1970 .

[12]  R. Patterson,et al.  Development and evaluation of an impedance cardiac output system. , 1966, Aerospace medicine.

[13]  S. Sjögren,et al.  A comparison between the thermal dilution method and the direct Fick and the dye dilution methods for cardiac output measurements in man. , 1970, Acta Societatis Medicorum Upsaliensis.