A client admitted with appendicitis who is scheduled for surgery in 2 hours complains of increased abdominal pain, vomiting, distended abdomen, and diminished bowel sounds. What is the most appropriate nursing intervention?

A. Administer a laxative to promote bowel movement: Laxatives are contraindicated - they increase bowel motility and could precipitate perforation or worsen obstruction/peritonitis in an acute abdomen. B. Offer the client pain medication: Analgesia is important but not the priority if the client shows signs of worsening/complication (increasing pain, distention, vomiting). Masking worsening signs without prompt evaluation could be harmful. Pain meds may be given after notifying the provider and as ordered. C. Assist the client to ambulate in the hallway: Ambulation is inappropriate for a client with a potentially worsening acute abdominal process (risk of perforation, hemodynamic instability, or sudden deterioration). It could increase discomfort and risk. D. Notify the healthcare provider immediately: These signs suggest possible complication (perforation, bowel obstruction, or peritonitis). Immediate notification allows urgent reassessment and possible expediting of surgery or additional interventions - this is the most appropriate immediate action.