Abstract
Three devices used to measure hemoglobin oxygen saturation in the extracorporeal circuit were studied and compared to a control. The Baxter Bentley OxySat, Oximetrix Accusat, and the Radiometer ABIA blood gas monitor were compared to a control, the IL 282 Co-Oximeter. Fifty-one sample points were obtained during all phases of cardiopulmonary bypass with results as follows: Table 1 Comparison of oxygen saturation devices. r DIFF SD p ACCUSAT 0.94 p<.0001 -0.6 3.2 0.1834 NS ABL-4 0.93 p<.0001 -1.7 3.3 0.0008 S OXYSAT 0.87 p<.0001 -6.8 4.4 0.0001 S r = correlation coefficient with corresponding p value, DIFF = difference from IL282, SD = Standard deviation of difference, p = p value for testing the hypothesis of no difference between test device and IL282, NS = no significant difference, S = significant difference. The Accusat was found to be a statistically more accurate means of monitoring hemoglobin oxygen saturations during cardiopulmonary bypass than the ABL4 and the OxySat. All devices had significant correlation with the control and with each other.
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