CDI Blood Parameter Monitoring System 500—A New Tool for the Clinical Perfusionist

Abstract

Sarns/3M Health Care has recently introduced the CDI 500 Blood Parameter Monitoring System. In addition to parameters previously available, this system now offers continuous monitoring of the patient’s oxygen consumption (VO 2 /min) and potassium concentration ([K + ]). The purpose of this study was: (1) to compare the [K + ] from the CDI 500 with the [K + ] derived from our hospital’s laboratory; and (2) to compare the VO 2 /min from the CDI 500 with the results obtained utilizing the “gold-standard” Fick equation. The mean absolute difference in [K + ] was 0.10 mEq/L with a mean percentage error of only 3.93%. The mean absolute difference in VO 2 /min was 18.78 ml O 2 /min, with a mean percentage error of 11.63%. We concluded that the [K + ] correlated well and that 9.13% of the oxygen consumption percentage error was attributable to the exclusion of dissolved oxygen in the calculation used by the CDI 500, with the remaining 2.5% attributable to differences in technology. We recommended that future upgrades to the CDI 500 should include dissolved O 2 when measuring oxygen consumption and consideration should be given to increasing the operating range for [K + ].