Original Article

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

Albert Einstein Medical Center, Philadelphia, Pennsylvania

^* Address correspondence to: David W. Fried, MS Ed, CCP P.O. Box 486 Gwynedd, PA 19436

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 (VO₂/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 VO₂/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 VO₂/min was 18.78 ml O₂/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 O₂ when measuring oxygen consumption and consideration should be given to increasing the operating range for [K⁺].