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Noninvasive intraoperative monitoring of carbon dioxide in children: endtidal versus transcutaneous techniques

Mace A Nosovitch1, Joel O Johnson, Joseph D Tobias

  • 1Departments of Child Health and Anesthesiology, The University of Missouri, Columbia, MO 65212, USA.

Paediatric Anaesthesia
|February 19, 2002
PubMed

Insights

Transcutaneous (Tc) CO2 monitoring offers a more accurate intraoperative estimate of arterial CO2 in pediatric patients compared to end-tidal (PE) CO2 monitoring. Both methods are generally acceptable for monitoring PCO2 during anesthesia in children.

Area of Science:

  • Anesthesiology
  • Pediatric Critical Care
  • Respiratory Physiology

Background:

  • Intraoperative monitoring of carbon dioxide (CO2) is crucial in pediatric anesthesia.
  • Noninvasive methods like transcutaneous (TcCO2) and end-tidal (PECO2) monitoring are used to estimate arterial CO2 (PaCO2).
  • Accurate CO2 monitoring is essential for patient safety and management during surgery.

Purpose of the Study:

  • To prospectively compare the accuracy of TcCO2 and PECO2 monitoring against PaCO2 in pediatric surgical patients.
  • To evaluate the clinical acceptability of noninvasive CO2 monitoring methods in children.
  • To determine which noninvasive method provides a more precise estimation of PaCO2 during intraoperative care.

Main Methods:

  • Prospective study involving 30 pediatric patients (6 months to 15 years).
  • Simultaneous measurements of arterial blood gases (PaCO2), end-tidal CO2 (PECO2), and transcutaneous CO2 (TcCO2).
  • A total of 64 sample sets were analyzed for comparison.

Main Results:

  • The difference between TcCO2 and PaCO2 was smaller and statistically more significant (P=0.038) than the PECO2 to PaCO2 difference.
  • TcCO2 provided a more accurate estimate of PaCO2, with 49 of 64 sample sets showing a difference of 0.4 kPa (3 mmHg) or less.
  • Linear regression showed a stronger correlation for TcCO2 (r2=0.8972) compared to PECO2 (r2=0.7676) versus PaCO2.

Conclusions:

  • Both TcCO2 and PECO2 monitoring can provide clinically acceptable estimates of PaCO2 in pediatric patients.
  • TcCO2 monitoring demonstrated slightly superior accuracy in estimating PaCO2 during intraoperative anesthetic care in children.
  • These findings support the use of TcCO2 as a reliable noninvasive tool for monitoring CO2 levels in pediatric surgery.
Abstract

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