• J D Tobias, D J Meyer, and M A Helikson.
• Department of Child Health, University of Missouri, Columbia 65212, USA.
• Can J Anaesth. 1998 Jan 1; 45 (1): 81-3.

PurposeTo determine the accuracy of the Paratrend 7 monitor inserted into a peripheral vein in providing continuous measurements of PCO2 and pH in children with respiratory failure.MethodsIn a prospective, case series at a University based PICU in a tertiary referral hospital and following informed consent, the Paratrend 7 intra-arterial blood gas monitoring system was inserted through a peripheral intravenous cannula. When clinically indicated, an arterial blood gas (ABG) was obtained. The values of pH and PCO2 from the Paratrend 7 and the ABG were compared using linear regression analysis and Bland-Altman analysis.ResultsSeventeen ABGs were obtained in the 4 patients. PaCO2 ranged from 29 to 51 mmHg and the pH values from 7.16 to 7.50. Linear regression analysis for the: Paratrend 7 pH vs the ABG pH resulted in an r = 0.9678 and an r2 = 0.9367 (P < 0.0001). Linear regression analysis for the Paratrend 7 CO2 vs ABG CO2 resulted in an r = 0.8273 and an r2 = 0.6845 (P = 0.01). Using a Bland and Altman analysis, the bias +/- precision of the PCO2 values was 3 +/- 1.4 and 0.036 +/- 0.02 for the pH values.ConclusionThe pH and PCO2 values obtained from the Paratrend 7 monitor provide a clinically acceptable correlation with arterial values.

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