Why would a stroke patient need a nasogastric tube?

Several reasons. If the patient needs oral nutrition or oral medication & has trouble eating or swallowing, a nasogastric tube provides a relatively short term solution other than ivs or tpn. Also, if there is any impairment of gastric motility in a stroke patient, this may alleviate discomfort. Reducing risks of aspiration (inhaling stomach content into the lungs creating a bad pneumonia) may be another reason.
The stroke. Can cause swallowing problems. Speech pathologist will check each stroke patient using a test called a modified barium swallow. If the patient fails this test an ng tube may be needed. If swallowing does not improve a gastrosty tube may be needed long term.