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Background  The frequency of malpositioning of gastric tubes in the trachea has been reported to be 0.3–15%, which may cause severe complications, such as pneumonia, if not detected promptly. If a gastric tube can be guided into the esophagus under direct vision with a video laryngoscope, misplacement of the gastric tube into the trachea can be avoided. We compared gastric tube insertion under direct vision using a video laryngoscope with the conventional method of blind insertion.    Methods  We enrolled 60 patients who required a transnasal gastric tube to facilitate elective abdominal surgery under general anesthesia. The participants were recruited consecutively into one of two groups, a group of 30 patients in whom a gastric tube was inserted using a King Vision™ video laryngoscope (KV group), and a group of 30 patients who underwent conventional blind insertion of the gastric tube (Blind group). The success rate, the time taken to insert the gastric tube, and the incidence of complications were compared.    Results  In the KV group, the time required for gastric tube placement was 52.5 ± 17.1 seconds, with a success rate of 100%. Slight oral hemorrhage occurred in two participants and slight epistaxis in one participant. In the Blind group, the time required for gastric tube placement was 65.9 ± 39.9 seconds, with a success rate of 90% (27 out of 30 patients). Slight oral hemorrhage occurred in two participants, slight epistaxis occurred in two participants, and tracheal malposition occurred in one participant but was detected promptly and corrected using the video laryngoscope. There were no significant differences in the time required for placing the gastric tube, the success rate, or the incidence of complications between the groups.    Conclusions  Gastric tube insertion using a King Vision video laryngoscope was straightforward, and was particularly useful for detecting and correcting tracheal malpositioning.    Trial registration  Trial registry number:  UMIN000011014 .

Gastric tube insertion under direct vision using the King Vision™ video laryngoscope: a randomized, prospective, clinical trial