A 38-year-old man presents with acute onset severe lower back pain and bilateral leg weakness. He has saddle anesthesia and cannot urinate. What is the most appropriate immediate management?

Emergency surgical decompression

A 44-year-old woman presents with sudden onset severe right upper quadrant pain radiating to the right shoulder tip. She has had previous episodes of biliary colic. Ultrasound shows gallstones with gallbladder wall thickening (6 mm), pericholecystic fluid, and a positive sonographic Murphy's sign. Blood tests show WBC 15.3×10⁹/L, CRP 78 mg/L. What is the optimal timing for cholecystectomy?

Early laparoscopic cholecystectomy within 72 hours of symptom onset

Immediate emergency cholecystectomy within 6 hours

Conservative management with antibiotics followed by interval cholecystectomy at 6-8 weeks

Percutaneous cholecystostomy followed by delayed cholecystectomy after 3 months

Urgent ERCP within 24 hours followed by cholecystectomy during same admission

A 76-year-old man with known colorectal adenocarcinoma presents with a 72-hour history of absolute constipation and abdominal distension. CT shows dilated colon up to 11 cm in diameter at the caecum with an obstructing sigmoid tumour. The caecal wall appears thinned. He has multiple comorbidities including severe COPD and recent myocardial infarction 8 weeks ago. What is the most appropriate management strategy?

Hartmann's procedure with sigmoid resection and end colostomy

Emergency subtotal colectomy with end ileostomy

Endoscopic stent placement across obstructing tumour as bridge to surgery

Proximal defunctioning transverse loop colostomy without tumour resection

On-table lavage with primary resection and anastomosis

A 67-year-old man presents with a 6-hour history of sudden onset severe epigastric pain. Erect chest radiograph shows free gas under the diaphragm. At laparotomy, a 1 cm perforated anterior duodenal ulcer is identified with minimal peritoneal contamination. What is the most appropriate surgical management?

Simple closure with omental patch (Graham patch) and peritoneal lavage

Partial gastrectomy with Billroth II reconstruction

Truncal vagotomy and pyloroplasty with ulcer excision

Whipple's procedure to ensure complete resection of ulcer-bearing area

Ulcer excision with primary closure and highly selective vagotomy

A 53-year-old woman undergoes CT for suspected appendicitis. The appendix appears normal, but CT shows streaky infiltration of mesenteric fat with a hyperdense ring surrounding a central hypodense nodule in the right lower quadrant, described as a 'fat ring sign'. The patient is haemodynamically stable with localized tenderness. What is the most appropriate management?

Conservative management with analgesia and observation as this represents epiploic appendagitis

Emergency appendicectomy due to early appendicitis not yet showing on CT

Urgent laparotomy for suspected mesenteric vein thrombosis

Right hemicolectomy to exclude underlying colonic malignancy

Broad-spectrum antibiotics for presumed bacterial peritonitis

What is Boerhaave's syndrome and what is the typical clinical presentation that distinguishes it from other causes of oesophageal perforation?

Spontaneous transmural oesophageal rupture following forceful vomiting, classically presenting with Mackler's triad of vomiting, chest pain, and subcutaneous emphysema

Iatrogenic oesophageal perforation during endoscopy presenting with subcutaneous emphysema

Oesophageal perforation from ingested foreign body causing mediastinitis and dysphagia

Malignant oesophageal perforation in advanced cancer causing pneumomediastinum

Oesophageal perforation from caustic ingestion presenting with odynophagia and drooling

A 41-year-old woman presents with a 16-hour history of severe right upper quadrant pain, fever of 38.7°C, and confusion. She appears jaundiced and unwell. Blood results: WBC 18.2×10⁹/L, bilirubin 89 μmol/L, ALP 456 U/L, ALT 234 U/L. Blood pressure 95/60 mmHg, heart rate 118 bpm. Ultrasound shows dilated common bile duct (12 mm) with multiple stones in gallbladder. What is the most appropriate immediate management?

Urgent ERCP with sphincterotomy within 24 hours combined with resuscitation and antibiotics

Emergency laparoscopic cholecystectomy within 6 hours

Percutaneous transhepatic cholangiography with biliary drainage

Conservative management with antibiotics and interval cholecystectomy at 6 weeks

Open cholecystectomy with common bile duct exploration

Bowel obstruction for UKMLA AKT: High-Yield Emergency & Acute Care Lessons

Quick Overview

Bowel obstruction is a surgical emergency requiring rapid assessment to distinguish small bowel (SBO) from large bowel obstruction (LBO), identify strangulation/ischaemia, and determine operative vs conservative management. NICE NG158 emphasizes early imaging, fluid resuscitation, and timely surgical referral. Mortality increases significantly with delayed recognition of strangulation (up to 30% vs 5% in simple obstruction).

Core Facts & Concepts

Key Definitions

Simple obstruction: Mechanical blockage without vascular compromise
Strangulation: Vascular compromise causing ischaemia (requires urgent surgery within 6 hours)
Closed-loop obstruction: Obstruction at two points (e.g., volvulus, hernia) with high strangulation risk

Common Causes

Small Bowel (80%)	Large Bowel (20%)
Adhesions (60%)	Colorectal cancer (60%)
Hernias (15%)	Diverticular disease (20%)
Malignancy (10%)	Volvulus (15%)
Crohn's disease (5%)	Pseudo-obstruction (5%)

Critical Numbers

📊 >6cm caecal diameter: High perforation risk (15-20%)
📊 72 hours: Conservative trial duration for SBO (if no strangulation features)
📊 Lactate >2mmol/L: Suggests ischaemia/strangulation
📊 WCC >15×10⁹/L: Red flag for strangulation

Figure 1: Abdominal X-ray showing dilated small bowel loops with valvulae conniventes crossing entire width and paucity of gas in colon

Imaging Findings

Feature	Small Bowel	Large Bowel
Dilatation threshold	>3cm	>6cm (>9cm caecum)
X-ray pattern	Central, valvulae conniventes (full width)	Peripheral, haustra (partial width)
CT sensitivity	90-95%	95-100%

Problem-Solving Approach

1. Initial Assessment (ABCDE)

Resuscitate: 2L crystalloid bolus, urinary catheter (target >0.5mL/kg/h)
NGT insertion if vomiting (decompression)
Bloods: FBC, U&E, lactate, VBG, G&S

2. Imaging Strategy

Erect CXR: Exclude perforation (pneumoperitoneum)
AXR: Identify SBO vs LBO pattern
CT abdomen/pelvis with IV contrast (gold standard): Transition point, cause, strangulation features

Figure 2: CT abdomen showing closed-loop small bowel obstruction with C-shaped dilated loop, mesenteric swirl sign and thickened bowel wall

3. Identify Strangulation Features 🚩

Continuous severe pain (not colicky)
Fever, tachycardia, peritonism
CT signs: Bowel wall thickening, mesenteric haziness, reduced enhancement, ascites, "whirl sign"

4. Management Decision

5. Surgical Intervention Criteria

Absolute: Strangulation, perforation, closed-loop with ischaemia
Relative: Failed conservative trial (72h SBO, 48h LBO), caecal diameter >6cm, complete obstruction with cancer

Analysis Framework

Differentiating SBO from LBO

Clinical Feature	Small Bowel	Large Bowel
Vomiting	Early, profuse, bilious	Late, faeculent
Pain frequency	High (every 2-3 min)	Low (every 10-15 min)
Distension	Minimal initially	Marked, early
Bowel sounds	High-pitched, tinkling	Low-pitched, infrequent
Dehydration	Rapid, severe	Gradual

Conservative Management Success Predictors

Partial obstruction (passage of flatus/stool)
Previous adhesional SBO
No peritonism or fever
Improving on serial examination (4-6 hourly)

⚠️ Warning: Virgin abdomen (no previous surgery) with SBO = malignancy or hernia until proven otherwise

Key Points Summary

✓ Strangulation features (fever, continuous pain, peritonism, lactate >2) mandate emergency surgery within 6 hours

✓ CT with IV contrast is gold standard (90-95% sensitivity); identifies transition point, cause, and ischaemia

✓ Conservative trial: 72 hours for SBO, 48 hours for LBO (with NGT, IV fluids, nil by mouth)

✓ Caecal diameter >6cm or closed-loop obstruction = high perforation risk requiring urgent surgery

✓ Adhesions cause 60% of SBO; colorectal cancer causes 60% of LBO

✓ Serial examination (4-6 hourly) essential to detect deterioration during conservative management

✓ Virgin abdomen with obstruction = think hernia (examine groins) or malignancy first

📌 Remember: The 6s - Strangulation Surgery within 6 hours; Caecum >6cm = danger; 6-hourly reviews

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