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The primary reason is that your stomach needs to be empty. General anesthesia can cause a person to vomit, or the person's own gag reflex can cause vomiting when the esophageal tube is being placed into the patient. This is why it's done when the patient is already under, and also why they give you a muscle relaxant beforehand.

Vomiting under such conditions can lead to the person aspirating (inhaling) the vomited material into the lungs, which is a very serious matter. If it happens during the surgical procedure, depending on the reason for surgery, the patient could die as a result.

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15y ago

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