Postop GI Complications

After surgery, especially abdominal procedures, sympathetic nervous system activation and anesthetic agents slow or temporarily halt peristalsis, producing a paralytic ileus. Normal bowel function returns in a predictable sequence: the small intestine resumes motility within 24 hours, the stomach within 24–48 hours, and the large intestine within 48–72 hours. Absent or hypoactive bowel sounds, abdominal distension, nausea, vomiting, and failure to pass flatus beyond 72 hours signal prolonged ileus. The nurse auscultates all four quadrants for at least one full minute each before charting bowel sounds as absent. Key interventions include early ambulation (the single most effective promoter of peristalsis), NPO or clear-liquid diet advancement based on return of bowel sounds and flatus, avoidance of straws and carbonated beverages to limit gas accumulation, and judicious opioid management since opioids further suppress motility. Nasogastric tube decompression may be ordered for persistent distension with vomiting. A mechanical small bowel obstruction — presenting with high-pitched, hyperactive tinkling bowel sounds, colicky pain, and possibly bilious vomiting — must be differentiated from ileus because management differs significantly. Monitor strict I&O, electrolytes (especially potassium — hypokalemia worsens ileus), and abdominal girth measurements at the same landmark each assessment.