Final answer:
For a client with a large bowel obstruction caused by diverticulosis, a nurse should primarily monitor for abdominal distention, which is a key symptom of this condition.
Step-by-step explanation:
The nurse caring for a client with a large bowel obstruction as a result of diverticulosis should monitor for several symptoms. Among these, abdominal distention is a key symptom to watch for in this condition. Other symptoms characteristic of diverticulosis and possible subsequent diverticulitis may include lower abdominal pain, fever, nausea, potential changes in bowel habits like diarrhea or constipation, and in more severe cases of diverticulitis, blood in the stool. While referred back pain, projectile vomiting, and metabolic alkalosis can be associated with gastrointestinal issues, they are less specific to diverticulosis-induced bowel obstruction than abdominal distention.