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- Narrowing: Narrowing of a tubular or hollow structure in the body, such as the intestinal tract or spinal column.
- Naso-Duodenal Tube (ND or ND-Tube): A tube that is inserted through one nostril of the nose and runs down the esophagus, through the stomach and into the duodenum. Liquid food (or formula) is pumped through the tube directly into the duodenum, bypassing the esophagus and stomach.
- Naso-Gastric Tube (NG or NG-Tube): A tube that has been inserted into one nostril that runs down the esophagus into the stomach. Liquid food (formula) is pumped through the tube directly into the stomach bypassing the esophagus.
- National Center for Advancing Translational Sciences (NCATS): A center of the National Institutes of Health that transforms the translational process so that new treatments and cures for disease can be delivered to patients faster.
- National Institute of Allergy and Infectious Diseases (NIAID): An institute of the National Institutes of Health that conducts and supports basic and applied research to better understand, treat, and ultimately prevent infectious, immunologic, and allergic diseases.
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK): An institute of the National Institutes of Health that conducts and supports research on diabetes, digestive, and kidney diseases.
- National Institute of Neurological Disorders and Stroke: Conducts and funds research on brain and nervous system disorders as part of the United States National Institutes of Health.
- National Institutes of Health (NIH): The medical research agency of the United States, supporting scientific discoveries that improve health and save lives.
- NCATS: See National Center for Advancing Translational Sciences.
- ND or ND-Tube: See Naso-Duodenal Tube.
- NG or NG-Tube: See Naso-Gastric Tube.
- NIAID: See National Institute of Allergy and Infectious Diseases.
- NIDDK: See National Institute of Diabetes and Digestive and Kidney Diseases.
- NIH: See National Institutes of Health.
- NINDS: See National Institute of Neurological Disorders and Stroke.
- NPO: No food by mouth.
