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Do pediatric patients undergoing cardiac surgeries require larger-size cuffed endotracheal tubes? A prospective study

Rasoul Azarfarin1, Mahin Seyedhejazi, Samad E J Golzari

  • 1Cardiovascular Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.

Paediatric Anaesthesia
|January 3, 2013
PubMed

Insights

Children undergoing cardiac surgery require larger endotracheal tubes (ETTs) than those for noncardiac procedures. This study compared proper-size cuffed ETT selection for pediatric cardiac versus noncardiac surgeries.

Area of Science:

  • Pediatric Anesthesiology
  • Thoracic Surgery
  • Critical Care Medicine

Background:

  • Controversy exists regarding appropriate endotracheal tube (ETT) sizing in pediatric cardiac surgery.
  • Anesthesiologists sometimes deviate from standard formula-based ETT size recommendations.
  • This study addresses the need for proper-size cuffed ETT selection in pediatric cardiac vs. noncardiac surgeries.

Purpose of the Study:

  • To compare the appropriate size of cuffed endotracheal tubes (ETTs) in children undergoing cardiac surgery versus noncardiac surgery.
  • To evaluate the accuracy of formula-based ETT sizing in these distinct pediatric surgical populations.
  • To determine if children undergoing cardiac surgery require different ETT sizes relative to their age and body size compared to noncardiac surgery patients.

Main Methods:

  • An observational prospective study involving 80 children in the cardiac surgery (CS) group and 80 in the noncardiac surgery (NCS) group.
  • Initial cuffed ETT size was calculated using the formula: Tube size (mm ID) = age (year)/4 + 3.5.
  • Recorded estimated ETT size and final utilized tube size for each age group.

Main Results:

  • Patients in the CS group requiring tube sizes 4.5, 5, and 5.5 were younger, smaller, and had lower body surface area than those in the NCS group (P < 0.05).
  • Formula-based ETT size prediction was less compatible with actual required sizes in the CS group (56.2%) compared to the NCS group (72.5%) (P = 0.02).
  • Underestimated ETT sizes were significantly more frequent in the CS group (38.8%) than in the NCS group (18.8%) (P = 0.01).

Conclusions:

  • Children undergoing cardiac surgery require larger-size endotracheal tubes relative to their age and body size compared to children undergoing noncardiac surgery.
  • Standard ETT sizing formulas may be less accurate for pediatric cardiac surgery patients.
  • Clinical judgment and potentially adjusted sizing strategies are important for ETT selection in pediatric cardiac procedures.
Abstract

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