toxic megacolon

A 28-year-old male presents with abdominal pain, diarrhea, distension, and fever. He has a history of ulcerative colitis. Vital signs include BP 97/58, HR 121, T 100.9 Oral, RR 24, SpO2 98% on RA. Exam reveals a patient who appears systemically ill, and his abdomen is diffusely tender. His bowel sounds are decreased, but he has no peritoneal findings. KUB shows markedly dilated loops of bowel. What’s the next step in your evaluation and treatment?