A nasogastric or orogastric tube is inserted through the nose (naso–) or mouth (oro–) of the patient into the stomach via the mouth and esophagus. The physician may use radiological guidance to advance the tube to the stomach. This procedure is mainly done to aspirate stomach contents for diagnostic or therapeutic purpose, to prevent aspiration and vomiting in trauma patients, and for enteral feeding. For patients with poisoning or drug overdose, the tube is used to remove the harmful substance from the body by draining the contents of the stomach. The tube is connected to a syringe or a suction pump at the external open end to aspirate or drain the stomach contents.
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