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  • Open Access

Effects of cardiac output levels on the measurement of transpulmonary thermodilution cardiac output in patients with acute lung injury

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Critical Care201216 (Suppl 1) :P217

  • Published:


  • Cardiac Output
  • Pulmonary Artery
  • Emergency Medicine
  • Acute Lung Injury
  • Volume Expansion


Transpulmonary thermodilution cardiac output (CO) correlates closely with pulmonary artery (PA) thermodilution CO. Levels of CO may contribute varying amounts of thermal indicator loss and recirculation during thermodilution CO measurement. This study aimed to investigate the effects of CO levels on the agreement between transpulmonary and PA thermodilution CO in acute lung injury (ALI) patients.


Twenty-two ALI patients were prospectively enrolled. Paired bolus transpulmonary thermodilution cardiac index (BCItp) and continuous PA thermodilution cardiac index (CCIpa) data were recorded at baseline and repeated immediately and at 2, 4, and 6 hours after volume expansion with a 500 ml infusion of 10% pentastarch (HES 200/0.5).


One hundred and ten paired CI measurements were recorded and divided into four quartiles from the lowest to the highest CCIpa. The mean BCItp was higher than CCIpa, and the Bland-Altman analysis revealed a bias of 0.57 ± 0.75 l/minute/m2. The limits of agreement (2SD) were +2.07 to -0.93 l/minute/m2. BCItp correlated closely with CCIpa (R = 0.887). CCIpa negatively correlated with the difference between BCItp and CCIpa (R = -0.26). The bias of quartile 1 with the least CCIpa was significantly greater than those of the three other quartiles.


In ALI patients, transpulmonary thermodilution is a clinically acceptable and interchangeable alternative to PA thermodilution for CO measurement. Levels of CO weakly and negatively correlate with the difference between BCItp and CCIpa. There is greater overestimation of BCItp over CCIpa in low than in high CO states.

Authors’ Affiliations

Chang Gung Memorial Hospital, Kwei-Shan, Taoyuan, Taiwan


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© Kao et al.; licensee BioMed Central Ltd. 2012

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.