A Sengstaken-Blakemore tube is a medical instrument inserted
through the nose or mouth. It's main use is to manage upper
gastrointestinal hemorrhage.
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Nasogastric suction involves removing solids, liquids, or gasses
from the stomach or small intestine by inserting a tube through the
nose and suctioning the gastrointestinal material through the
tube.
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The gastrointestinal (GI) tract or its also known as the
alimentary canal.