The Science Journal of the American Association for Respiratory Care

1997 OPEN FORUM Abstracts

EVALUATION OF THE PARATREND 7 BLOOD GAS ANALYSIS SYSTEM IN ADULT PATIENTS WITH ARDS.

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

Introduction: Titration of PEEP and FiO_{2} are common adjustments used during therapeutic support of adult patients with severe ARDS. These ventilator adjustments require frequent monitoring of arterial blood gas values to determine the efficacy of the care. Use of continuous indwelling blood gas catheters may be useful for patients who require frequent ventilator adjustments. We evaluated the Paratrend 7 blood gas catheter to determine the bias and error compared against our conventional reference analyzers.

Methods: Six patients admitted to our intensive care units for ARDS were selected for this comparative trial. A Paratrend 7 (Diametrix Medical, Inc) probe was calibrated and inserted through a radial artery catheter. Arterial blood gases were obtained as part of our routine ventilator support. The values displayed on the Paratrend monitor were recorded (PO_{2}, PCO_{2}, pH) and compared against the reference values obtained from our Point-Of-Care (POC) center (IL model 1640). A total of 49 comparisons were collected as part of this evaluation. The data was analyzed using the procedure described by Bland and Altman. Results: We observed significant correlation's for all the analytes between the Paratrend 7 and our reference analyzer. However, the correlation between the Paratrend and reference analyzer was lowest for PO_{2} (r= 0.701, p < 0.05). The correlation for PCO_{2} and pH were r=0.969, p < 0.05 and r=0.933, p < 0.05, respectively. The bias and error for each analyte comparison are shown in the table below:

PO_{2} PCO_{2} pH

Bias -3 2 torr -0.02

torr

Error 19 7 torr 0.06

torr

Conclusions: The Paratrend 7 blood gas analyzer system offers continuous analysis of blood gas through the use of an indwelling probe. Our initial pilot study demonstrated significant correlation's, bias and error when compared against conventional analyzer results. However, PO_{2} appeared to be the most erratic analyte. Further studies are warranted to determine the application and cost effectiveness of this technology.

OF-97-155

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