- Poster presentation
- Open Access
Performance of thermodilution catheters under control and extreme circulatory conditions in a pig model
© Yang et al. 2011
- Published: 1 March 2011
- Cardiac Output
- Percentage Error
- Pulmonary Artery Catheter
- Drug Infusion
Four domestic pigs, weight 30 to 32 kg, were anaesthetized. An aortic flow probe was placed via a left thoracotomy. Both Arrow (n = 6) and Edwards (n = 6) 7F pulmonary artery catheters and a Siemens SC9000 monitor were used. Sets of cardiac output readings were taken (three to six pairs). Catheters were changed frequently and cardiac output increased (for example, dopamine and adrenaline) and decreased (for example, trinitrate and beta-blocker) using drug infusions. Baseline and drug treatment data were compared.
The flow probe has a relatively low (1 to 2%) precision error, thus the baseline percentage error of 24.3% is in keeping the quoted precision error for thermodilution of ± 20%. However, under more extreme circulatory conditions thermodilution behaved less reliably with widened limits of agreement and precision errors (42.0%). Thermodilution is less accurate than originally thought in haemodynamically unstable patients.
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 (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.