Abstract
The distances from the maxillary alveolar margin and external nares to the carina and the vocal folds were measured from chest roentgenograms in 77 patients weighing between 750 gm and 5000 gm. The tip of an endotracheal tube introduced 7 cm beyond the alveolar margin, or 8 cm beyond the external nares, would fall somewhere in the trachea in all patients in this series weighing between 800 gm and 4500 gm. The incidence of misplacement of endotracheal tubes is high (50% in this series). Introduction (or subsequent displacement) of the tube beyond 7 cm (if in the mouth) of 8 cm (if in the nose) should arouse suspicion of misplacement of the tube tip in the right mainstem bronchus.
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