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Single breath end-tidal CO2 estimates of arterial PCO2 in infants and children

B Bissonnette1, J Lerman

  • 1Department of Anaesthesia, Hospital for Sick Children, Toronto, Ontario.

Canadian Journal of Anaesthesia = Journal Canadien D'Anesthesie
|March 1, 1989
PubMed

Insights

Single breath end-tidal carbon dioxide (PECO2) measurements accurately estimate arterial PCO2 (PaCO2) in pediatric patients. This non-invasive method provides reliable PCO2 monitoring during surgery in infants and children.

Area of Science:

  • Anesthesiology
  • Pediatric Critical Care
  • Respiratory Physiology

Background:

  • Accurate monitoring of arterial carbon dioxide (PaCO2) is crucial in pediatric anesthesia.
  • Non-invasive methods for estimating PaCO2 are desirable to reduce patient risk.

Purpose of the Study:

  • To evaluate the accuracy of single breath end-tidal carbon dioxide (PECO2) measurements for estimating PaCO2 in infants and children.

Main Methods:

  • 68 healthy infants and children (ASA physical status I or II) undergoing surgery were studied.
  • A 3 ml single breath sample was collected via a needle inserted into the endotracheal tube.
  • PECO2 was measured and compared to simultaneously obtained PaCO2 samples.

Main Results:

  • Mean PECO2 (33.6 +/- 6.9 mmHg) was not significantly different from mean PaCO2 (33.6 +/- 5.6 mmHg).
  • A high coefficient of determination (r2 = 0.97) indicated a strong correlation between PECO2 and PaCO2.
  • The measurements demonstrated excellent agreement between the two methods.

Conclusions:

  • Single breath PECO2 measurements from the proximal endotracheal tube accurately estimate PaCO2 in pediatric patients.
  • This method offers a reliable, non-invasive approach for PCO2 monitoring in this population.
  • The findings support the use of PECO2 as a surrogate for PaCO2 in pediatric anesthesia.

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