Management of Peritonitis and Bowel Obstruction

Initial Assessment and Resuscitation

The American College of Surgeons recommends immediate surgical exploration for patients with peritonitis and bowel obstruction who present with signs of diffuse peritonitis, hemodynamic instability, or septic shock, while hemodynamically stable patients without peritonitis may undergo initial nonoperative management with close monitoring for 24-48 hours 1
The Infectious Diseases Society of America suggests beginning rapid intravenous fluid resuscitation to restore intravascular volume as soon as peritonitis or bowel obstruction is suspected, with the goal of achieving adequate perfusion and preventing organ dysfunction 1
The Society of Critical Care Medicine recommends administering broad-spectrum antibiotics targeting gram-negative and anaerobic bacteria as soon as the diagnosis is suspected or confirmed, with the goal of reducing morbidity and mortality 1, 2

The World Society of Emergency Surgery recommends proceeding directly to the operating room for patients with diffuse peritonitis with hemodynamic instability or septic shock, free perforation with generalized fecal peritonitis, pneumoperitoneum with clinical signs of peritonitis, signs of bowel ischemia or strangulation, or clinical deterioration despite resuscitation 1, 3, 4, 5
The Eastern Association for the Surgery of Trauma suggests that surgery should not be delayed beyond 24 hours for patients with complete bowel obstruction with signs of peritonitis, failure to improve after 24-48 hours of aggressive medical therapy, progressive colonic distension on serial imaging, or persistent fever after 48-72 hours suggesting occult perforation 2, 5

The American College of Surgeons recommends resecting necrotic or perforated bowel, creating an end stoma rather than anastomosis, and avoiding primary anastomosis in the presence of shock, severe contamination, or multiple risk factors for patients with hemodynamic instability 4, 5
The Society of Surgical Oncology suggests that resection with anastomosis may be considered for hemodynamically stable patients with localized contamination and fewer than 2 risk factors for anastomotic complications 5

The Infectious Diseases Society of America recommends empiric antibiotic selection that covers gram-negative aerobic bacteria, gram-positive streptococci, and obligate anaerobes, with the goal of achieving satisfactory drug levels during source control procedures 1, 6
The Society for Healthcare Epidemiology of America suggests considering coverage for multidrug-resistant organisms based on local epidemiology for patients with healthcare-associated infections 6

The American College of Surgeons recommends close communication between the surgeon and anesthesiologist to assess resuscitation effectiveness and guide treatment decisions, with continuous reassessment of patient stability to determine if damage control versus definitive surgery is appropriate 7
The Society of Critical Care Medicine suggests monitoring for surgical complications and healthcare-associated infections, and providing supportive care including pain management, hemodynamic monitoring, renal support, and nutrition 7

Pneumoperitoneum, bowel wall thickening > 3 mm, or large volumes of free fluid on imaging identify higher‑grade obstruction and increase the likelihood of requiring operative intervention (World Journal of Emergency Surgery) 8.

The presence of pneumoperitoneum together with free intra‑abdominal fluid in an acutely ill patient mandates prompt laparotomy (World Journal of Emergency Surgery) 8, 9.

For hemodynamically stable patients, a laparoscopic approach is preferred when local expertise is available, because it shortens hospital stay and lowers morbidity (World Journal of Emergency Surgery) 10, 11, 8, 9.
In hemodynamically unstable patients, an open laparotomy is required to minimize operative time (World Journal of Emergency Surgery) 10, 11.
Primary anastomosis should be avoided when there is significant peritoneal contamination, hemodynamic instability, or multiple risk factors for anastomotic leak (World Journal of Emergency Surgery) 10, 9.
When severe sepsis or septic shock is present, damage‑control surgery—resection with stapled bowel ends and temporary abdominal closure—should be performed, with planned re‑exploration within 24–48 hours (World Journal of Emergency Surgery) 10, 9.

Patients with inflammatory bowel disease may require subtotal colectomy with ileostomy for severe refractory colitis (World Journal of Emergency Surgery) 10, 11, 8, 9.