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Effect of persistent left superior vena cava on hemodynamic calculations
M A Fogel1, M T Donofrio, H S Baldwin
1Department of Pediatrics, Children's Hospital of Philadelphia, Pennsylvania 19104, USA.
The American Journal of Cardiology
|July 15, 1995
Summary
Right and left superior vena cava (SVC) saturations show no mean difference and do not impact cardiac output calculations. However, variability necessitates caution with Fick-derived cardiac index in patients with a left SVC.
Area of Science:
- Cardiovascular physiology
- Medical device technology
Background:
- Superior vena cava (SVC) oxygen saturation is crucial for cardiac output (CO) estimation.
- Variability in SVC saturation measurements can impact clinical decisions.
Purpose of the Study:
- To compare oxygen saturation and calculated cardiac output between right and left SVC.
- To assess the reliability of Fick-derived cardiac index with a left SVC.
Main Methods:
- Comparison of mean right and left SVC saturations.
- Analysis of cardiac output calculations based on SVC saturations.
- Correlation analysis between SVC and pulmonary artery saturations.
Main Results:
- No significant difference in mean saturation between right and left SVC.
- Individual variability in saturation and CO calculations was high.
- Left SVC saturation showed a higher correlation with pulmonary artery saturation.
Conclusions:
- While mean SVC saturations are comparable, individual variability impacts accuracy.
- Fick-derived cardiac index requires cautious interpretation in the presence of a left SVC.
- Further prospective studies with simultaneous sampling are recommended.