Effect of solute temperature in the measurement of cardiac output in children using the thermodilution technique

2016 ◽  
Vol 12 (2) ◽  
pp. 181-187 ◽  
Author(s):  
Shyam Sathanandam ◽  
Pooja Kashyap ◽  
David Zurakowski ◽  
Lindsey Bird ◽  
Vera McGhee ◽  
...  
Keyword(s):  
Cardiac Output ◽  
Thermodilution Technique

scholarly journals The Peri-Operative Measurement of Cardiac Output in Infancy by the Thermodilution Technique

1975 ◽  
Vol 3 (4) ◽  
pp. 317-320 ◽  
Author(s):  
G. M. Lawrie ◽  
R. B. Stacey ◽  
J. S. Wright
Keyword(s):  
Animal Model ◽  
Cardiac Output ◽  
Accurate Method ◽  
Left Heart ◽  
Thermodilution Technique ◽  
Right Heart

Cardiac output has been measured in infants by thermodilution during and after surgery. A method employing commercially available equipment has been developed. An animal model has been devised whereby right heart outputs of 210 ml to 2240 ml, measured by thermodilution, could be compared with left heart outputs measured by an aortic by-pass. The results of this study suggest that thermodilution is a simple, accurate method for measurement of cardiac output in infancy.

Cardiac output during exercise measured by acetylene rebreathing, thermodilution, and Fick techniques

1995 ◽  
Vol 78 (4) ◽  
pp. 1612-1616 ◽  
Author(s):  
C. C. Hsia ◽  
L. F. Herazo ◽  
M. Ramanathan ◽  
R. L. Johnson
Keyword(s):  
Cardiac Output ◽  
Steady State ◽  
Breathing Pattern ◽  
The Other ◽  
Mixing Efficiency ◽  
Myocardial Tissue ◽  
Methodological Issues ◽  
Thermodilution Technique ◽  
Blood Temperature ◽  
Rebreathing Method

In dogs during exercise, respiratory rate can reach 200 breaths/min, blood temperature can exceed 42 degrees C, and hematocrit can approach 60%. To determine whether these changes significantly affect the measurement of cardiac output by the acetylene rebreathing method (QcRB), we compared estimates of QcRB with those measured by thermodilution and Fick (QcFI) techniques in nine dogs at rest and during steady-state exercise on a treadmill up to near-maximal workloads. Solubility of acetylene in blood was corrected to the simultaneously measured blood temperature and hematocrit. Results were also adjusted for mixing efficiency. Up to a QcFI of 20 l/min, QcRB was not significantly different from QcFI (P > 0.05). However, cardiac output measured by thermodilution was consistently higher than those measured by the other techniques (P < 0.0001). We conclude that the overall agreement between QcRB and QcFI estimates supports the validity of the rebreathing technique under exercise conditions where body temperature and hematocrit are changing rapidly and the breathing pattern is unrestrained. Systematic error by the thermodilution technique may be related to a variety of methodological issues as well as possible dissipation of cooling into the myocardial tissue and subsequent incomplete washout.

Thermodilution technique for measurement of cardiac output during artificial ventilation

1981 ◽  
Vol 51 (3) ◽  
pp. 584-591 ◽  
Author(s):  
J. R. Jansen ◽  
J. J. Schreuder ◽  
J. M. Bogaard ◽  
W. van Rooyen ◽  
A. Versprille
Keyword(s):  
Cardiac Output ◽  
Room Temperature ◽  
Artificial Ventilation ◽  
Ventilation Rate ◽  
Positive End Expiratory Pressure ◽  
Excellent Correlation ◽  
Thermodilution Technique ◽  
Thermodilution Method ◽  
The Right ◽  
Dilution Curves

The feasibility of using the thermodilution method to monitor cardiac output during artificial ventilation was studied in anesthetized pigs. Normal saline (0.5 ml) at room temperature was injected into the left ventricle or the right atrium. The dilution curves were detected in the aortic arch and the pulmonary artery, respectively. The ventilation rate was 10 cycles/min at end-expiratory pressures of 0, 5, 10, and 15 cmH2O. For each level, 50 measurements of cardiac output were performed at regular intervals over the ventilatory cycle. The order of measurements were randomly selected. The average of each series of 50 measurements showed excellent correlation with the estimates of cardiac output based on the direct Fick method for oxygen. The maximum difference between the values of cardiac output randomly measured by the thermodilution method was 40% for the left side of the heart and 70% for the right side. However, when the values of cardiac output were sorted according to the specific phases of the respiratory cycle, there was a systematic variation with a small random error. For the left side of the heart, a satisfactory moment of injection for estimation of mean cardiac output appeared to be at the end of the spontaneous expiration. On the other hand, the analysis of cardiac output values at the right side did not reveal any satisfactory moment for injectate administration under changing circumstances, e.g., positive end-expiratory pressure.

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