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Korean J Anesthesiol. 1991 Jun;24(3):490-495. Korean. Original Article.
Lee TI , Shin CM , Park JY .
Department of Anesthesiology, College of Medicine, Inje University, Pusan, Korea.

End-tidal PCO2 measurements are less accurate in neonates, infants, and small children than in adults. These in accuracies may by attributed in part to the dilution of end-tidal gas with fresh gas as a result of placing the sampling catheter between the endotracheal tube and a partial rebreathing circuit. To determine the most accurate catheter position for measurements of end-tidal gas tensions, end-tidal PCO2 was measured continuously from the distal and proximal end of the endotracheal tube and these data were compared with simultaneous arterial PCO2 The results were as follows: 1) In children weigthing above 15 kg ventilated with partial rebreathing circuit, both distal and proximal end-tidal PCO2 values approximated arterial PCO2 (p<0.05). 2) In infants and children weigthing below 15 kg ventilated with Ayre's T-piece breathing circuit(Jackson-Rees modification), only distal end-tidal PCO2 approximated arterial PCO2.

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