Q: The large bore (16 F ) nasogastric tube (NGT), popularly known as Salem Sump tube has two lumens at the outside. The larger lumen is usually connected to the intermittent wall suction. What is the function of the open port on the side (pigtail), usually blue in color?
Answer: Most commonly used NGTs in ICU has two lumens. The larger lumen is usually connected to the intermittent wall suction for draining gastric contents, irrigation, and delivery of medications or feeding. The smaller lumen (called sump port) which is usually of blue color and hangs out as a side port vents to atmosphere. This equalizes the pressure in the stomach once the stomach is empty. This serves the purpose of preventing the distal holes of NGT from adhering to the stomach wall. Also, this port should never be clamped while suction is being applied.
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Reference:
1. Bard Medical Sump Naso-Gastric Tube
http://m.bardmedical.com/media/751612/nasogastric-sump-tubes.pdf
2. Bong CL, Macachor JD, Hwang NC. Insertion of the nasogastric tube made easy. Anesthesiology. 2004 Jul;101(1):266.
3. Stayner JL, Bhatnagar A, McGinn AN, Fang JC. Feeding tube placement: errors and complications. Nutr Clin Pract. 2012 Dec;27(6):738-48.
4. Tucker A, Lewis J. Procedures in practice. Passing a nasogastric tube. Br Med J. 1980 Oct 25;281(6248):1128-9.
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