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Noninvasive intraoperative monitoring of carbon dioxide in children: endtidal versus transcutaneous techniques
Author(s) -
NOSOVITCH MACE A,
JOHNSON JOEL O,
TOBIAS JOSEPH D
Publication year - 2002
Publication title -
pediatric anesthesia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.704
H-Index - 82
eISSN - 1460-9592
pISSN - 1155-5645
DOI - 10.1046/j.1460-9592.2002.00766.x
Subject(s) - medicine , significant difference , anesthesia , linear regression , carbon dioxide , mean difference , pco2 , surgery , nuclear medicine , confidence interval , statistics , ecology , mathematics , biology
Background : The current study prospectively compares the accuracy of the intraoperative use of transcutaneous (Tc) and endtidal (P E ) CO 2 monitoring during surgical procedures in 30 paediatric patients, ranging in age from 6 months to 15 years (6.15 ± 4.35 years) and in weight from 4.7 to 73 kg (24.9 ± 18.2 kg). Methods : Following calibration and an equilibration time for the TcCO 2 monitor, arterial blood gas samples were obtained as clinically indicated. A total of 64 sample sets (PaCO 2 , P E CO 2 and TcCO 2 ) were obtained from the 30 patients. Results : The P E CO 2 to PaCO 2 difference was 0.6–0.9 kPa (4.4 ± 7.1 mmHg) while the TcCO 2 to PaCO 2 difference was 0.36–0.38 kPa (2.8 ± 2.9 mmHg) ( P =NS). The difference between the PaCO 2 and P E CO 2 was 0.4 kPa (3 mmHg) or less in 37 of 64 sample sets while the difference between the PaCO 2 and TcCO 2 was 0.4 kPa (3 mmHg) or less in 49 of 64 sample sets ( P =0.038). Linear regression analysis of P E CO 2 vs. PaCO 2 revealed a slope of 0.434, r =0.8761, r 2 =0.7676. Linear regression analysis of TcCO 2 vs. PaCO 2 revealed a slope of 0.914, r =0.9472, r 2 =0.8972. Conclusions : Although in most circumstances, both noninvasive monitors of PCO 2 provided a clinically acceptable estimate of PaCO 2 , TCCO 2 provided a slightly more accurate estimate of PaCO 2 during intraoperative anaesthetic care in children.