In many cases of massive GI bleeding, airway control is essential. During endotracheal intubation, suction sometimes just isn't adequate enough to allow to get a good view of the vocal cords. The pool of blood keeps re-accumulating faster than you can suction. You think you see an arytenoid, pointing you in the direction of the trachea, and so you slide the endotracheal tube in.
Unfortunately, when you bag the patient, you realize that you are in the esophagus.
Trick of the Trade:
Leave the esophageal tube in.
Reattempt endotracheal intubation.
"When life gives you lemons, make lemonade."
If the endotracheal tube is in the esophagus, do NOT take it out! You have just created a conduit to remove further bleeding from the field. Take another look with Yankauer suction. Reattempt your intubation with a second tube. Do this as soon as you recognize an esophageal intubation to reduce the patient's risk for oxygen desaturation.