Final answer:
The patient likely has severe diverticulitis and requires hospitalization, intravenous antibiotics, and bowel rest. If complications like an abscess or perforation are present, surgery is indicated.
Step-by-step explanation:
The treatment for a patient with a post coronary artery bypass graft (CABG) who develops abdominal pain and a lower gastrointestinal (LGI) bleed with a computed tomography (CT) scan showing thickened bowel wall and mesenteric stranding likely involves diverticulitis management. For mild diverticulitis, oral antibiotics along with a short-term liquid diet may be sufficient.
However, the case seems more severe, given the LGI bleed and CT findings, thus hospitalization, intravenous antibiotics, and bowel rest—no food or drink by mouth—may be indicated. Should there be complications such as an abscess or colon perforation, surgical intervention may be necessary.