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J Clin Monit Comput. 2008 Dec;22(6):431-3. doi: 10.1007/s10877-008-9149-5. Epub 2008 Nov 14.

Is the cardiac output obtained from a Swan-Ganz catheter always zero?

Author information

1
Division of General Anesthesia and Intensive Care, Medical University of Vienna, Waehringer Guertel 18-20/9 i, 1090, Vienna, Austria. wolfgang.schramm@meduniwien.ac.at

Abstract

OBJECTIVE:

By means of a Swan-Ganz catheter cardiac output is calculated using the Stewart-Hamilton thermodilution equation. Assuming the body as a thermally isolated inert system, this equation theoretically always results in zero cardiac output.

METHODS:

Using the first and second law of thermodynamics together with a few lines simple analysis this statement is proven.

CONCLUSION:

It is at least a necessary condition for the application of the Stewart-Hamilton equation, that core body temperature is kept constant in a thermo- regulatory steady state.

PMID:
19009363
DOI:
10.1007/s10877-008-9149-5
[Indexed for MEDLINE]

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