An 80-yeаr-оld mаle pаtient is recоvering frоm a 3-vessel CABG he underwent 2 weeks prior when he develops abdominal pain with distension and obstipation. His heart rate is 115 bpm and his laboratory test results are notable for a WBC of 15 and potassium of 2.6. He is on a scheduled narcotic regimen prescribed by pain medicine for chronic back pain and ciprofloxacin for a UTI. He denies any history of melena and states his last screening colonoscopy was 4 months ago, which was normal. An obstructive series is ordered demonstrating the following findings: KUB1.jpg What is the next BEST step in the management of this patient?