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

2011 ◽  
Vol 59 (4) ◽  
pp. 435-439 ◽  
Author(s):  
M. Gawlikowski ◽  
T. Pustelny ◽  
B. Przywara-Chowaniec ◽  
J. Nowak-Gawlikowska
Keyword(s):  
Cardiac Output ◽  
Pulmonary Artery ◽  
Salt Solution ◽  
Model Analysis ◽  
Cardiac Output Measurement ◽  
Output Measurement ◽  
Thermodilution Cardiac Output ◽  
Thermal Indicator ◽  
Thermodilution Method ◽  
Cardiac Output Measurements

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

scholarly journals Thermodilution Cardiac Output — A Systematic Error

1981 ◽  
Vol 9 (2) ◽  
pp. 135-139 ◽  
Author(s):  
W. B. Runciman ◽  
A. H. Ilsley ◽  
J. G. Roberts
Keyword(s):  
Cardiac Output ◽  
Systematic Error ◽  
Correction Factor ◽  
Cardiac Output Measurement ◽  
Thermodilution Technique ◽  
Output Measurement ◽  
Thermodilution Cardiac Output ◽  
Thermal Indicator ◽  
Wide Range ◽  
Cardiac Output Measurements

The purpose of this study was to examine the mechanism and magnitude of a systematic error in thermodilution cardiac output measurement. One hundred and seventy-one thermodilution cardiac output measurements in dogs using a Swan-Ganz catheter were compared with simultaneously made dye dilution measurements under different conditions over a wide range of cardiac outputs. A systematic error with the thermodilution technique was confirmed and was almost identical to that observed in the literature. It is proposed that its mechanism is loss of thermal indicator between the injectate orifice and detection. Application of a further correction factor for thermal indicator loss is suggested.

Cardiac Output Determination

1993 ◽  
Vol 4 (1) ◽  
pp. 81-97 ◽  
Author(s):  
Susan L. Woods ◽  
Susan Osguthorpe
Keyword(s):  
Cardiac Output ◽  
Critical Care Nurses ◽  
Cardiac Output Measurement ◽  
Nursing Management ◽  
Output Measurement ◽  
Thermodilution Cardiac Output ◽  
Cardiac Output Determination ◽  
Output System ◽  
Cardiac Output Measurements ◽  
Management Issues

Critical care nurses frequently are involved in obtaining cardiac output measurements and in using these data to assess and to plan therapy. This article reviews the physiologic determinants of cardiac output and the clinical factors that influence these determinants. Principles and techniques of common methods of cardiac output measurement are discussed. A thorough presentation of guidelines for troubleshooting problems with thermodilution cardiac output measurement is provided in a table. Nursing management issues are discussed using relevant nursing research. Future considerations in cardiac output measurement are discussed, and suggestions of an ideal cardiac output system are provided

scholarly journals 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

2012 ◽  
Vol 19 (4) ◽  
pp. 751-758
Author(s):  
Maciej Gawlikowski ◽  
Tadeusz Pustelny
Keyword(s):  
Cardiac Output ◽  
Pulmonary Artery ◽  
Dynamic Response ◽  
Cardiac Output Measurement ◽  
Slew Rate ◽  
Pulmonary Artery Catheterization ◽  
Output Measurement ◽  
The Relationship ◽  
Cardiac Output Measurements

Abstract 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.

Comparison of continuous with intermittent bolus thermodilution cardiac output measurements

1995 ◽  
Vol 4 (6) ◽  
pp. 460-465 ◽  
Author(s):  
CE Ditmyer ◽  
M Shively ◽  
DB Burns ◽  
RT Reichman
Keyword(s):  
Cardiac Output ◽  
Intraclass Correlation ◽  
Continuous Cardiac Output ◽  
Cardiac Output Monitoring ◽  
Monitoring Method ◽  
Convenience Sample ◽  
Thermodilution Cardiac Output ◽  
Intermittent Bolus ◽  
Thermodilution Method ◽  
Cardiac Output Measurements

BACKGROUND: Few complete studies have been published to validate the agreement between continuous cardiac output and intermittent thermodilution cardiac output. OBJECTIVE: To analyze the agreement between cardiac output measurements by the continuous thermodilution method and the intermittent bolus thermodilution method, using a continuous cardiac output catheter in postoperative cardiothoracic surgery patients. METHODS: A convenience sample of 14 adult cardiothoracic surgical patients with thermodilution pulmonary artery catheters placed preoperatively was used. A total of 214 comparison measurements of cardiac output by both the continuous and intermittent thermodilution methods were taken on patient admission to the critical care unit, every 4 hours, and with any change greater than 10% from baseline readings. RESULTS: The intraclass correlation between continuous cardiac output and intermittent cardiac output was .89. The limits of agreement were -1.34 to 1.18 L/min, indicating that in 95% of readings the difference between continuous cardiac output and intermittent cardiac output were within this range. CONCLUSIONS: The continuous cardiac output monitoring method shows clinically acceptable agreement with the intermittent cardiac output method.

Sign in / Sign up

Export Citation Format

Share Document