Soru

A $78$-year-old woman is brought to the emergency department from a skilled nursing facility due to severe abdominal pain and altered mental status. Staff report that she has had progressive abdominal distention, nausea, and no bowel movements for the past $3$ days. Her past medical history is significant for Parkinson disease, chronic constipation, and moderate Alzheimer dementia. Her temperature is $38.6^\circ\text{C}$ ($101.5^\circ\text{F}$), pulse is $122/\text{min}$, blood pressure is $85/55\text{ mmHg}$, and respirations are $24/\text{min}$. Physical examination reveals a massively distended abdomen that is diffusely tender to palpation, with severe rigidity and involuntary guarding. Bowel sounds are absent. Laboratory studies show a leukocyte count of $18,500/\text{mm}^3$ and a serum lactate level of $4.8\text{ mmol/L}$. An upright abdominal radiograph demonstrates a markedly dilated loop of colon extending from the pelvis to the right upper quadrant in an inverted U-shape, lacking haustra. Which of the following is the most appropriate next step in management?