In vitro determination of accuracy of cardiac output measurements by thermal dilution

1982 ◽  
Vol 33 (5) ◽  
pp. 409-414 ◽  
Author(s):  
Thomas V. Bilfinger ◽  
Chung-Yuan Lin ◽  
Constantine E. Anagnostopoulos
Keyword(s):  
Cardiac Output ◽  
Cardiac Output Measurements ◽  
Thermal Dilution

Choice of detection site for the determination of cardiac output by thermal dilution: the injection-thermistor-catheter

1973 ◽  
Vol 7 (1) ◽  
pp. 133-138 ◽  
Author(s):  
A. C. A. P. VLIERS ◽  
B. OESEBURG ◽  
K. R. VISSER ◽  
W. G. ZIJLSTRA
Keyword(s):  
Cardiac Output ◽  
Thermal Dilution

Sterility of Prefilled Syringes for Thermal Dilution Cardiac Output Measurements

1979 ◽  
Vol 36 (9) ◽  
pp. 1156-1157
Author(s):  
Edward J. Mattea ◽  
Anthony N. Paruta ◽  
Leonard R. Worthen
Keyword(s):  
Cardiac Output ◽  
Prefilled Syringes ◽  
Cardiac Output Measurements ◽  
Thermal Dilution

Analysis of indicator distribution in the determination of cardiac output by thermal dilution

1973 ◽  
Vol 7 (1) ◽  
pp. 125-132 ◽  
Author(s):  
A. C. A. P. VLIERS ◽  
K. R. VISSER ◽  
W. G. ZIJLSTRA
Keyword(s):  
Cardiac Output ◽  
Thermal Dilution

scholarly journals Cardiac Output Measurements by Thermal Dilution in Anaesthesia and Intensive Care

1973 ◽  
Vol 1 (5) ◽  
pp. 393-399 ◽  
Author(s):  
James Loughman
Keyword(s):  
Cardiac Output ◽  
Intensive Care ◽  
Practical Method ◽  
Indicator Dilution ◽  
Cardiovascular Disorders ◽  
Dilution Technique ◽  
Cardiac Output Measurements ◽  
Commercial Equipment ◽  
Thermal Dilution

Cardiac output measurements are rarely used in the evaluation of cardiovascular disorders encountered in anaesthesia and intensive care. The thermal dilution technique provides a practical method for its widespread introduction and only requires techniques already familiar to people working in this field. Adequate commercial equipment is now available in Australia, and a consideration of its use is presented. The principle of indicator dilution and its application is described. A comparison is made of dye and thermal dilution, and the relative advantages of two catheter systems for use in thermal dilution are discussed. The reported complications and those experienced by us are presented.

Errors in calculating cardiac output due to administration of perfluorochemicals

1983 ◽  
Vol 54 (1) ◽  
pp. 318-320 ◽  
Author(s):  
A. L. Rosen ◽  
S. A. Gould ◽  
L. R. Sehgal ◽  
H. L. Sehgal ◽  
G. S. Moss
Keyword(s):  
Cardiac Output ◽  
Specific Heat ◽  
Red Blood Cells ◽  
Intravenous Administration ◽  
Blood Cells ◽  
Red Cells ◽  
Correction Factors ◽  
Calibration Constant ◽  
Thermal Dilution

Intravenous administration of perfluorochemicals (PFC) will alter the density (rho)B, the gravimetric specific heat (c)B, and the volumetric specific heat (rho c)B of blood. Changes in hematocrit also influence (rho c)B. The calibration constant employed in the determination of cardiac output (CO) by thermal dilution depends inversely on (rho c)B. We estimate the effect of addition of PFC and changes in hematocrit on (rho c)B. Consider blood to be a mixture of red cells, emulsified PFC particles, and plasma. This leads to the equation: (rho c)cB = 0.96 - 0.11Hct - 0.48Fct. Here Hct and Fct are the fractional volume concentrations of red blood cells and PFC, and (rho c)cB is the calculated specific heat based on the actual composition of blood. CO can be corrected for changes in (rho c)B by the equation: (CO)c = [(rho c)sB/(rho c)cB](CO)o. Here (CO)o is the observed cardiac output, (rho c)sB is the standard specific heat of blood used in the calculation of (CO)o, and (CO)c is the corrected cardiac output. We have observed laboratory situations where the correction factors have been as high as 10%.

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