Final answer:
Examples of nasogastric tubes include the Salem-sump and Levin, but the Swan-Ganz is not an NG tube. Salem-sump has double lumens, while the Levin tube is for short-term therapy with a single lumen.
Step-by-step explanation:
Examples of nasogastric (NG) tubes include the Salem-sump and Levin tubes; however, the Swan-Ganz is not a type of NG tube. NG tubes are medical devices used to deliver and remove substances to and from the stomach. They pass through the nasal meatuses—superior, middle, and inferior, then the nasopharynx, and down to the stomach. The Salem-sump is a type of NG tube with double lumens that allows for both removal of gastric contents and air venting. In contrast, the Levin tube is a single lumen tube and is typically used for short-term therapy to remove substances from the stomach or to add nutrition.