The Science Journal of the American Association for Respiratory Care

1997 OPEN FORUM Abstracts

EVALUATION OF SENSICATH^{R} BLOOD GAS MEASUREMENT SYSTEM FOR POINT-OF-CARE SUPPORT.

Lauren Stapp, RRT, Shari Bailey, RRT, Paul Loik, RRT, Linda Folk, RRT, Ronald Dechert, MS, RRT. Critical Care Support Services, University of Michigan Medical Center, Ann Arbor, MI.

Introduction: Analysis of arterial blood gases are important to provide appropriate and timely therapeutic management of the mechanically ventilated critical care patient. Historically, this service (ABG's) has been provided through central or satellite laboratories which resulted in increased delays associated with sample transport, analysis and reporting. To decrease the turn-around-time (TAT) associated with STAT blood gas analysis, POC centers have been developed. The purpose of these POC's is to place ABG analysis as close to the patient as possible. An extension of the POC philosophy is the development of patient attached analyzers which allow immediate access to arterial blood samples and blood gas analysis. We evaluated the Sensicath^{R} Blood Gas Measurement System (Optical Sensors Incorporated, Eden Prairie, MN) to determine the bias and error compared to conventional bench top blood gas analysis. Methods: Sixteen mechanically ventilated adult patients admitted to our intensive care units were selected for this comparative trial. A SensiCath^{R} Blood Gas Measurement System was attached to the arterial line of each patient following calibration of the sensor. Arterial blood gas measurements were obtained per routine patient management. The arterial blood gas readings from the SensiCath^{R} were recorded immediately preceding the collection of the arterial samples. All arterial samples were analyzed using an Instrumentation Laboratories Blood Gas Analyzer (IL model 1640). A total of 64 comparison blood gas measurements were used for this study. The bias and error of the SensiCath^{R} was determined using the technique described by Bland and Altman. Results: We found excellent correlation between the values obtained from the SensiCath^{R} and our reference analyzers. The correlation's were: PO_{2}, r^{2}=0.97, p < 0.05, PCO_{2}, r^{2}=0.86, p < 0.05 and pH, r^{2}=0.86, p < 0.05. The observed bias (SensiCath^{R}-reference)and error for each analyte were: -0.8 torr ± 12 torr for PO_{2}, 1.5 torr ± 3 torr for PCO_{2} and 0.01 ± 0.03 for pH. Conclusions: The SensiCath^{R} Blood Gas Measurement System provides reliable blood gas analysis when compared against conventional reference analyzers. The patient attached characteristic of this analyzer may be desirable in patient populations which require minimal blood loss. A complete cost analysis is warranted to determine the feasibility of using this system.

OF-97-156

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