A 55-year-old woman with no prior abdominal surgery presents with acute onset severe colicky pain in the left lower abdomen, constipation, and abdominal distension. On examination, she has a palpable mass in the left iliac fossa and a rigid abdomen with guarding. Abdominal X-ray shows a dilated colon with a 'bird's beak' appearance at the rectosigmoid junction and proximal bowel gas. Temperature is 38.5°C and WBC is 14,000/μL. What is the most appropriate immediate next step in management?

Explanation

## Sigmoid Volvulus with Peritonitis: Emergency Surgical Management ### Clinical Diagnosis This patient presents with **sigmoid volvulus complicated by peritonitis/bowel ischemia**. Key diagnostic clues: - **'Bird's beak' appearance at rectosigmoid junction** → pathognomonic of sigmoid volvulus - **Rigid abdomen with guarding** → peritoneal signs indicating bowel ischemia or perforation - **Fever (38.5°C) + leukocytosis (WBC 14,000/μL)** → systemic inflammatory response consistent with ischemia/perforation - **No prior surgery** → adhesions less likely; volvulus fits the clinical picture ### Why Immediate Exploratory Laparotomy (Option A) is Correct **Clinical Pearl:** In sigmoid volvulus, the presence of **peritoneal signs (rigid abdomen, guarding), fever, and leukocytosis** indicates gangrenous bowel or perforation — an absolute contraindication to endoscopic decompression and a mandate for **emergency surgery** (Bailey & Love's Short Practice of Surgery, 27e, Ch 71; Sabiston Textbook of Surgery, 21e, Ch 52). | Finding | Significance | |---------|-------------| | Rigid abdomen + guarding | Peritonitis → bowel ischemia or perforation | | Fever 38.5°C | Systemic sepsis from gangrenous bowel | | WBC 14,000/μL | Leukocytosis consistent with ischemia/perforation | | Bird's beak on X-ray | Confirms sigmoid volvulus | When sigmoid volvulus is complicated by peritonitis, the management is **immediate exploratory laparotomy** with resection of the gangrenous sigmoid colon. On-table colostomy (Hartmann's procedure) is the standard approach in this emergency setting because: - Primary anastomosis is unsafe in the presence of peritonitis, unprepared bowel, and hemodynamic compromise - Hartmann's procedure (resection + end colostomy + rectal stump closure) is the accepted emergency standard (Sabiston 21e) ### Why NOT Each Alternative? **CT abdomen (Option C):** - CT is valuable in stable patients without peritoneal signs to confirm diagnosis and assess perforation - However, in this patient with **overt peritonitis** (rigid abdomen, guarding, fever, leukocytosis), the clinical diagnosis is established and CT would only **delay life-saving surgery** - The principle: "Do not CT a patient who needs the operating room" — peritonitis is a clinical diagnosis requiring immediate operative intervention - Per Bailey & Love and Sabiston: peritoneal signs in volvulus = emergency laparotomy without delay for imaging **Flexible sigmoidoscopy with decompression/stent (Option B):** - **Absolutely contraindicated** when peritoneal signs are present - Endoscopic decompression is appropriate ONLY in uncomplicated sigmoid volvulus (no peritonitis, no ischemia) - Attempting endoscopy in gangrenous bowel risks perforation and fatal peritoneal contamination - Stent placement has no role in volvulus management **Nasogastric tube + IV fluids with observation (Option D):** - Appropriate for early, uncomplicated small bowel obstruction - **Completely inappropriate** in a patient with peritonitis and suspected gangrenous bowel - Observation risks progression to frank perforation, fecal peritonitis, and septic shock ### Management Algorithm for Sigmoid Volvulus ``` Sigmoid Volvulus ↓ Peritoneal signs present? (rigid abdomen, guarding, fever, leukocytosis) ↓ YES ↓ NO Emergency Laparotomy Flexible Sigmoidoscopy + Hartmann's Procedure (endoscopic decompression) (resection + end colostomy) ↓ Successful? → Elective sigmoid resection Failed? → Surgery ``` **High-Yield:** The key discriminator in sigmoid volvulus management is the **presence or absence of peritoneal signs**. Peritonitis = emergency surgery; no peritonitis = endoscopic decompression first. This patient has unequivocal peritonitis, making immediate laparotomy the only correct answer.