Why the study?
Does Portapres accurately estimate cardiac output compared to a rebreathing method in healthy subjects?
Population
Healthy subjects (n=8 for maximal treadmill exercise, n=8 for orthostatic stress)
Comparison
Portapres continuous estimates of cardiac output… vs Rebreathing method
Design
Cross-sectional
Authors
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Limits Portapres to detecting large CO changes in individuals or groups; leaves open validation for other populations and references.
Does Portapres accurately estimate cardiac output compared to a rebreathing method in healthy subjects?
Portapres overestimates cardiac output and has precision errors that limit its clinical utility to detecting large changes in individual subjects or group averages for smaller changes.
PITT et al. (2004) studied this question.
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