| Cardiac output measurement in ventilated lambs with a significant left-to-right shunt using the modified carbon dioxide fick method. | |
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MedLine Citation:
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PMID: 19752578 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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BACKGROUND: It remains a great challenge to measure systemic blood flow in critically ill newborns. In a former study we validated the modified carbon dioxide Fick (mCO(2)F) method for measurement of cardiac output in a newborn lamb model. In this new study we studied the influence of a left-to-right shunt on the accuracy of the mCO(2)F method. OBJECTIVE: To analyze the influence of a left-to-right shunt on the agreement between cardiac output measurement with the mCO(2)F method and ultrasonic transit time pulmonary blood flow in a lamb model. METHODS: The study was approved by the Ethical Committee on Animal Research of the Radboud University Nijmegen and performed in 8 random-bred lambs. A Gore-Tex shunt was placed between the left pulmonary artery and the descending aorta. This aortopulmonary shunt was intermittently opened and closed, while cardiac output was manipulated by creating hemorrhagic hypotension. Cardiac output measurement with the mCO(2)F method (Q(mCO2F)) was compared with pulmonary blood flow obtained by a transit time ultrasonic flow probe positioned around the common pulmonary artery (Q(APC)). RESULTS: Bias, defined as Q(mCO2F) - Q(APC), was calculated for each measurement. With an open shunt there was a significant left-to-right shunt (mean Qp/Qs ratio 2.26; range 1.56-3.69). Mean bias (SD) was -12.3 (50.4) ml x kg(-1) x min(-1) and -12.3 (42.7) ml x kg(-1) x min(-1) for measurements with a closed and open shunt, respectively (no statistical significant difference). CONCLUSIONS: Cardiac output measurement with the mCO(2)F method is reliable and easily applicable in ventilated newborn lambs, also in the presence of a significant left-to-right shunt. |
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Authors:
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Willem P de Boode; Jeroen C W Hopman; Marc H W A Wijnen; Ronald B Tanke; Hans G van der Hoeven; K Djien Liem |
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Publication Detail:
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Type: Journal Article Date: 2009-09-11 |
Journal Detail:
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Title: Neonatology Volume: 97 ISSN: 1661-7819 ISO Abbreviation: Neonatology Publication Date: 2010 |
Date Detail:
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Created Date: 2010-02-05 Completed Date: 2010-04-22 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101286577 Medline TA: Neonatology Country: Switzerland |
Other Details:
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Languages: eng Pagination: 124-31 Citation Subset: IM |
Copyright Information:
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Copyright 2009 S. Karger AG, Basel. |
Affiliation:
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Department of Neonatology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands. W.deBoode@cukz.umcn.nl |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Animals, Newborn Aorta / physiology Blood Pressure / physiology Carbon Dioxide / blood* Cardiac Output / physiology* Models, Animal Models, Cardiovascular* Monitoring, Physiologic / methods*, standards Pulmonary Circulation / physiology Reproducibility of Results Respiration, Artificial* Sheep |
| Chemical | |
Reg. No./Substance:
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124-38-9/Carbon Dioxide |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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