Key result
Continuous venous oximetry reliably predicts intermittent in vitro SvO2 and strongly correlates with oxygen utilization.
Why the study?
The efficacy of continuous venous oximetry to supplement traditional hemodynamic monitoring in critically ill surgical patients was evaluated.
Does continuous venous oximetry accurately reflect intermittent in vitro SvO2 and overall oxygen balance in critically ill surgical patients?
Observational (n=39)
Does continuous venous oximetry accurately reflect intermittent in vitro SvO2 and overall oxygen balance in critically ill surgical patients?
Continuous venous oximetry is a reliable predictor of intermittent in vitro SvO2 and reflects the overall balance between oxygen consumption and delivery in critically ill surgical patients.
Answers are grounded in this paper and cite their sources.
Supports continuous venous oximetry as SvO2 surrogate in critically ill surgical patients; leaves open whether adoption improves outcomes.
A prospective study was performed to evaluate the efficacy of continuous venous oximetry to supplement traditional hemodynamic monitoring in 39 critically ill surgical patients. There was no statistically significant difference in SvO2 between the continuous in vivo values and in vitro values (0.694 +/- 0.095 vs. 0.698 +/- 0.108). There was no statistically significant correlation between continuously measured SvO2 and PaO2 (r = 0.09, p greater than 0.5), SaO2 (r = 0.08, p greater than 0.5), or oxygen consumption (r = 0.46, p greater than 0.5). There was a slight but statistically significant correlation between continuously measured SvO2 and cardiac output (r = 0.40, p less than 0.025) and oxygen delivery (r = 0.49, p less than 0.005). There was a highly significant correlation between continuously measured SvO2 and oxygen utilization coefficient (r = -0.96, p less than 0.001). Continuously measured SvO2 is a reliable predictor of SvO2 measured intermittently by in vitro methods. In critically ill surgical patients, SvO2 does not correlate highly with the individual determinants of oxygen transport but rather correlates with the oxygen utilization coefficient and therefore reflects the overall balance between oxygen consumption and delivery.
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Loren D. Nelson (1986) conducted an observational in critically ill surgical patients (n=39). Continuous venous oximetry vs. In vitro methods (intermittent SvO2 measurement) was evaluated on Difference in SvO2 between continuous in vivo values and in vitro values. Continuous venous oximetry reliably predicted intermittently measured in vitro SvO2 (0.694 vs 0.698) and correlated highly with the oxygen utilization coefficient (r = -0.96, p<0.001).
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