Colorimetric end-tidal CO2 (ETCO2) detectors (Easy Cap, Nellcor Inc, Hayward, CA) are extremely useful in determining the position of the endotracheal tube (ETT) in the airway and have been validated in animals, children, and adults.1-6 They have not been labelled for use in children weighing 15 kg because of their large dead space of 38 mL.1-3

We have demonstrated in numerous studies that the ETCO2 detector accurately verifies the ETT position in infants weighing >2 kg with spontaneous circulation.1-3

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