To the Editor.—

Since publishing our article "Utility of an End-Tidal Carbon Dioxide Detector During Stabilization and Transport of Critically Ill Children (Pediatrics. 1992;89:1042-1044), it has been brought to our attention,1 and we also have observed that contamination of the end-tidal CO2 detector with gastric acid causes permanent yellow discoloration of the detector. The same is true of direct contact of the detector with resuscitation drugs (epinephrine, atropine, lidocaine).1 Such discoloration has not been observed with deep intratracheal drug administration.2,3

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