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The influence of limited dynamic response of the indicator detector in a Swan-Ganz catheter on the overestimation of cardiac output measurement by means of thermodilution

Gawlikowski M., Pustelny T.

Metrology and Measurement Systems

2012

Vol. 19, nr 4

751-758

Nowadays the "gold clinical standard" of hemodynamics diagnostic and cardiac output measurements is pulmonary artery catheterization by means of the Swan-Ganz catheter and thermodilution. The method itself is sensitive to numerous disturbances which cause inaccurate results. One of the well-known disadvantages of thermodilution is the overestimation of results at low values of cardiac output. This effect may concern the limited slew rate of the thermoelement mounted at the tip of the catheter. In this paper the relationship between the dynamic response of the thermoelement and the uncertainty of cardiac output measurements by means of thermodilution has been investigated theoretically and experimentally.

Theoretical and model analysis of the unreliability of cardiac output measurement by means of the thermodilution method

Gawlikowski M., Pustelny T., Przywara-Chowaniec B., Nowak-Gawlikowska J.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2011

Vol. 59, nr 4

435-439

Thermodilution is the clinically most often applied method of cardiac output measurements. This method is based on thermal indicator (iced isotonic salt solution) variation measurements by a Swan-Ganz catheter located inside the pulmonary artery. The unreliability of thermodilution should be estimated theoretically because of the lack of references. In this paper an attempt has been made to estimate theoretically the unreliability of thermodilution cardiac output measurements.