A 66-year-old man presents with sudden onset severe epigastric pain radiating to the back. He has vomited twice. Past history includes hypertriglyceridaemia and type 2 diabetes. On examination, he is tachycardic (110 bpm), blood pressure 95/60 mmHg, temperature 38.2°C. Investigations show: amylase 1850 U/L, WCC 18 × 10⁹/L, CRP 180 mg/L, calcium 1.95 mmol/L, glucose 14.2 mmol/L, urea 12.5 mmol/L. What is the most appropriate immediate management?
Q72
A 31-year-old woman presents with a 15-month history of abdominal pain, bloating, and alternating bowel habit. She reports that symptoms are worse during stressful periods at work and improve during holidays. Colonoscopy and coeliac serology are normal. Faecal calprotectin is 25 μg/g. Which pathophysiological mechanism best explains her symptom profile?
Q73
A 54-year-old man with alcoholic cirrhosis presents with confusion and drowsiness. His wife reports he has been increasingly forgetful over the past week. On examination, he has asterixis and a flapping tremor. Blood tests show: bilirubin 85 μmol/L, albumin 28 g/L, INR 1.8, ammonia 120 μmol/L (normal <50). What is the primary mechanism underlying his current presentation?
Q74
A 42-year-old woman presents with a 3-month history of epigastric discomfort and bloating after meals. She denies any alarm symptoms. Physical examination is unremarkable. She has no past medical history and takes no regular medications. What is the most appropriate initial management strategy?
Q75
A 63-year-old man presents with progressive dysphagia to solids over 3 months and 7 kg weight loss. He has a 15-year history of gastro-oesophageal reflux disease managed with omeprazole. Urgent upper GI endoscopy reveals a 4 cm suspicious lesion at the gastro-oesophageal junction. Biopsies confirm adenocarcinoma. CT chest/abdomen/pelvis shows the tumour and enlarged coeliac axis lymph nodes but no distant metastases. What is the most appropriate next investigation to guide treatment planning?
Q76
A 58-year-old man with chronic pancreatitis due to alcohol excess presents with worsening abdominal pain and steatorrhoea. He has lost 8 kg over 6 months. Faecal elastase-1 is <15 μg/g stool (normal >200 μg/g). CT pancreas shows pancreatic atrophy and calcification. He is commenced on pancreatic enzyme replacement therapy. Which additional supplementation is most important to prescribe?
Q77
A 46-year-old man with alcohol-related cirrhosis and recurrent ascites undergoes large volume paracentesis with removal of 8 litres of ascitic fluid. Which intervention has been shown to reduce the risk of post-paracentesis circulatory dysfunction and improve mortality?
Q78
A 39-year-old woman presents with a 14-month history of crampy abdominal pain, bloating worse after meals, and loose stools 3-4 times daily. Symptoms improve when she avoids eating and are not present at night. She has no rectal bleeding or weight loss. Physical examination is normal. Blood tests including FBC, CRP, thyroid function, and tissue transglutaminase antibodies are normal. According to NICE guidelines for IBS diagnosis, which of the following additional criteria must be present for at least 6 months?
Q79
A 71-year-old man is admitted with haematemesis. He has a history of ischaemic heart disease and atrial fibrillation and takes warfarin. His INR is 3.8 and Hb 82 g/L. Following resuscitation and correction of coagulopathy, he undergoes endoscopy which reveals a 2 cm gastric ulcer with a visible vessel (Forrest IIa). The bleeding is controlled with endoscopic therapy. What is the most appropriate subsequent management regarding his anticoagulation?
Q80
A 34-year-old woman presents with a 5-day history of worsening bloody diarrhoea (10-12 times daily), severe abdominal cramping, and fever. She has ulcerative colitis diagnosed 3 years ago. On examination, she appears unwell with temperature 38.2°C, pulse 115 bpm, BP 110/70 mmHg. Her abdomen is distended with tenderness but no guarding. Blood tests show: Hb 98 g/L, WBC 15.8 × 10⁹/L, platelets 420 × 10⁹/L, CRP 145 mg/L, albumin 28 g/L. Abdominal X-ray shows colonic dilatation with transverse colon diameter of 6.2 cm. What is the most appropriate immediate management?
Gastroenterology & Hepatology UK Medical PG Practice Questions and MCQs
Question 71: A 66-year-old man presents with sudden onset severe epigastric pain radiating to the back. He has vomited twice. Past history includes hypertriglyceridaemia and type 2 diabetes. On examination, he is tachycardic (110 bpm), blood pressure 95/60 mmHg, temperature 38.2°C. Investigations show: amylase 1850 U/L, WCC 18 × 10⁹/L, CRP 180 mg/L, calcium 1.95 mmol/L, glucose 14.2 mmol/L, urea 12.5 mmol/L. What is the most appropriate immediate management?
A. Immediate contrast-enhanced CT abdomen to assess necrosis
B. Aggressive intravenous fluid resuscitation with crystalloid and HDU/ITU monitoring (Correct Answer)
C. Urgent ERCP within 24 hours
D. Prophylactic antibiotics with intravenous meropenem
E. Nasojejunal feeding tube insertion for early enteral nutrition
Explanation: ***Aggressive intravenous fluid resuscitation with crystalloid and HDU/ITU monitoring***
- This patient presents with **severe acute pancreatitis** complicated by **hemodynamic instability** (BP 95/60, HR 110 bpm), making aggressive fluid resuscitation the most immediate and critical management to maintain organ perfusion and prevent further organ damage.
- The presence of **systemic inflammatory response syndrome (SIRS)** criteria (tachycardia, fever) and signs of organ dysfunction (hypotension, elevated urea, glucose) necessitates **HDU/ITU monitoring** for close observation and goal-directed therapy.
*Immediate contrast-enhanced CT abdomen to assess necrosis*
- **Contrast-enhanced CT** for assessing pancreatic necrosis is typically delayed for **72-96 hours** from symptom onset, as early scans often underestimate the extent of necrosis.
- In a **hemodynamically unstable** patient, stabilization and **fluid resuscitation** take precedence over immediate imaging; the diagnosis of acute pancreatitis is already clinically evident with high amylase.
*Urgent ERCP within 24 hours*
- **Urgent ERCP** is specifically indicated in acute pancreatitis only if there is concomitant **acute cholangitis** or persistent biliary obstruction, which are not described here.
- The patient's history of **hypertriglyceridaemia** is a common cause of pancreatitis, suggesting a non-biliary etiology, thus making ERCP an unnecessary and potentially harmful procedure in this case.
*Prophylactic antibiotics with intravenous meropenem*
- Current guidelines do not recommend **prophylactic antibiotics** for severe acute pancreatitis, as studies have shown no reduction in the incidence of infected necrosis or overall mortality.
- Antibiotics should be reserved for cases with **documented infection**, such as infected pancreatic necrosis (confirmed by imaging and aspiration) or other extrapancreatic infections.
*Nasojejunal feeding tube insertion for early enteral nutrition*
- While **early enteral nutrition** (within 24-72 hours) is beneficial in severe pancreatitis to maintain gut barrier function, it is implemented *after* initial **fluid resuscitation** and hemodynamic stabilization.
- It is not the most immediate life-saving intervention when the patient is experiencing **circulatory collapse** and requires urgent management of hypovolemia.
Question 72: A 31-year-old woman presents with a 15-month history of abdominal pain, bloating, and alternating bowel habit. She reports that symptoms are worse during stressful periods at work and improve during holidays. Colonoscopy and coeliac serology are normal. Faecal calprotectin is 25 μg/g. Which pathophysiological mechanism best explains her symptom profile?
A. Altered gut-brain axis signalling and visceral hypersensitivity (Correct Answer)
B. Low-grade mucosal inflammation with increased intestinal permeability
C. Bacterial overgrowth in the small intestine causing fermentation
D. Impaired chloride channel function leading to reduced intestinal secretion
E. Decreased serotonin reuptake in enteric neurons causing dysmotility
Explanation: ***Altered gut-brain axis signalling and visceral hypersensitivity***
- This patient's symptoms of chronic abdominal pain, bloating, and alternating bowel habit, alongside normal colonoscopy, coeliac serology, and faecal calprotectin (<50 μg/g), are characteristic of **Irritable Bowel Syndrome (IBS)**, fitting **Rome IV criteria**.
- The core pathophysiology of IBS involves **visceral hypersensitivity** (increased pain perception from normal gut stimuli) and dysfunctional communication within the **gut-brain axis**, which explains the exacerbation of symptoms during stressful periods.
*Low-grade mucosal inflammation with increased intestinal permeability*
- While some IBS patients exhibit minor immune changes, the normal **faecal calprotectin** (25 μg/g) in this case strongly argues against significant **mucosal inflammation** or **increased intestinal permeability** being the primary driver of symptoms.
- This mechanism is more typically associated with **Inflammatory Bowel Disease (IBD)** or certain forms of **post-infectious IBS** where inflammatory markers would be elevated.
*Bacterial overgrowth in the small intestine causing fermentation*
- **Small Intestinal Bacterial Overgrowth (SIBO)** can cause bloating and altered bowel habits due to fermentation, but it does not fully explain the pronounced **stress-related symptom fluctuations** seen in this patient.
- SIBO is usually diagnosed with **hydrogen breath tests** and, while it can coexist with IBS, it is not considered the primary overarching pathophysiological mechanism for typical IBS presentation.
*Impaired chloride channel function leading to reduced intestinal secretion*
- This mechanism is characteristic of conditions such as **Cystic Fibrosis** or certain forms of **constipation-predominant IBS (IBS-C)**, where there is inadequate fluid secretion into the intestinal lumen.
- The patient presents with **alternating bowel habits**, not solely constipation, and there is no evidence to suggest a primary defect in chloride channel function; in fact, some IBS-C treatments *enhance* chloride secretion.
*Decreased serotonin reuptake in enteric neurons causing dysmotility*
- Although **serotonin (5-HT)** is crucial for gut motility and sensation and is dysregulated in IBS, the primary issue is complex **serotonin signaling dysfunction** rather than a simple defect in reuptake.
- **Selective serotonin reuptake inhibitors (SSRIs)**, which *increase* synaptic serotonin by blocking reuptake, are sometimes used to treat IBS symptoms by modulating the **gut-brain axis**, suggesting that decreased reuptake is not the underlying cause.
Question 73: A 54-year-old man with alcoholic cirrhosis presents with confusion and drowsiness. His wife reports he has been increasingly forgetful over the past week. On examination, he has asterixis and a flapping tremor. Blood tests show: bilirubin 85 μmol/L, albumin 28 g/L, INR 1.8, ammonia 120 μmol/L (normal <50). What is the primary mechanism underlying his current presentation?
A. Accumulation of ammonia leading to cerebral oedema and astrocyte swelling (Correct Answer)
B. Portal systemic shunting causing reduced first-pass metabolism of neurotoxins
C. Decreased hepatic synthesis of clotting factors causing microhaemorrhages
D. Hypoalbuminaemia causing reduced oncotic pressure and cerebral hypoperfusion
E. Increased bilirubin crossing the blood-brain barrier causing direct neurotoxicity
Explanation: ***Accumulation of ammonia leading to cerebral oedema and astrocyte swelling***
- High levels of **ammonia** cross the **blood-brain barrier** and are metabolized to **glutamine** within brain **astrocytes**, leading to an osmotic influx of water.
- This process causes **astrocyte swelling**, **cerebral oedema**, and impaired neurotransmission, manifesting as **hepatic encephalopathy** with symptoms like **confusion**, **drowsiness**, and **asterixis**.
*Portal systemic shunting causing reduced first-pass metabolism of neurotoxins*
- While **portosystemic shunting** is a critical **predisposing factor** allowing toxins like ammonia to bypass hepatic detoxification, it is not the direct cellular mechanism of brain injury.
- The primary mechanism of brain dysfunction is the **neurotoxic effect** of the accumulated substances, mainly **ammonia**, on the cerebral cells themselves.
*Decreased hepatic synthesis of clotting factors causing microhaemorrhages*
- The patient's elevated **INR** (1.8) indicates impaired **hepatic synthesis of clotting factors**, increasing the risk of bleeding complications.
- However, **confusion**, **drowsiness**, and **asterixis** are classic signs of **metabolic encephalopathy** due to liver failure, not typically microhaemorrhages, which would often present with more focal neurological deficits.
*Hypoalbuminaemia causing reduced oncotic pressure and cerebral hypoperfusion*
- **Hypoalbuminaemia** (low albumin) leads to reduced **oncotic pressure**, which primarily contributes to **ascites** and peripheral oedema, not direct cerebral hypoperfusion.
- Cerebral blood flow is generally well-maintained in cirrhosis, and hypoperfusion is usually due to significant **hypotension** or other systemic insults, not primarily low albumin.
*Increased bilirubin crossing the blood-brain barrier causing direct neurotoxicity*
- Elevated **bilirubin** is present and causes **jaundice** in adults with liver disease, but **bilirubin neurotoxicity** (**kernicterus**) is predominantly a concern in **neonates**.
- In adults, the **blood-brain barrier** is mature and largely impervious to bilirubin at levels typically seen in cirrhosis, so it does not primarily cause acute confusion or **flapping tremor**.
Question 74: A 42-year-old woman presents with a 3-month history of epigastric discomfort and bloating after meals. She denies any alarm symptoms. Physical examination is unremarkable. She has no past medical history and takes no regular medications. What is the most appropriate initial management strategy?
A. Trial of proton pump inhibitor therapy for 4 weeks (Correct Answer)
B. Urgent upper GI endoscopy
C. Helicobacter pylori test-and-treat strategy
D. Trial of histamine-2 receptor antagonist
E. Referral for barium swallow
Explanation: ***Trial of proton pump inhibitor therapy for 4 weeks***
- In patients under **age 60** (or 55 depending on local guidelines) without **alarm symptoms**, an empirical trial of a **PPI (Proton Pump Inhibitor)** is a standard initial diagnostic and therapeutic step for **uninvestigated dyspepsia**.
- This strategy effectively manages symptoms of **acid reflux** or **functional dyspepsia** while avoiding unnecessary invasive procedures in low-risk individuals.
*Urgent upper GI endoscopy*
- Endoscopy is indicated for patients with **alarm symptoms** (e.g., weight loss, anemia, dysphagia) or those exceeding the **age threshold** (typically ≥60 years).
- Since this patient is 42 and has an unremarkable examination without alarm features, **invasive testing** is not immediately necessary.
*Helicobacter pylori test-and-treat strategy*
- This is a valid alternative strategy; however, **PPI therapy** is often prioritized for initial symptom relief in cases of suspected functional dyspepsia or GERD.
- **H. pylori testing** is typically indicated if symptoms persist after the initial PPI trial or if the patient belongs to a population with **high prevalence** of the infection.
*Trial of histamine-2 receptor antagonist*
- **H2-receptor antagonists (H2RAs)** are generally considered less potent and less effective than **PPIs** for the treatment of dyspeptic symptoms.
- While they can be used, clinical guidelines prioritize **PPIs** as the first-line pharmacologic intervention for empirical therapy.
*Referral for barium swallow*
- A **barium swallow** is primarily used to evaluate **structural abnormalities** such as strictures or motility disorders like **achalasia**, which are not suspected here.
- It has very limited diagnostic utility in evaluating **dyspepsia** compared to endoscopy or empirical medical management.
Question 75: A 63-year-old man presents with progressive dysphagia to solids over 3 months and 7 kg weight loss. He has a 15-year history of gastro-oesophageal reflux disease managed with omeprazole. Urgent upper GI endoscopy reveals a 4 cm suspicious lesion at the gastro-oesophageal junction. Biopsies confirm adenocarcinoma. CT chest/abdomen/pelvis shows the tumour and enlarged coeliac axis lymph nodes but no distant metastases. What is the most appropriate next investigation to guide treatment planning?
A. Endoscopic ultrasound (Correct Answer)
B. Laparoscopy for peritoneal staging
C. Repeat endoscopy with endoscopic mucosal resection
D. Bronchoscopy to assess airway involvement
E. PET-CT scan
Explanation: ***Endoscopic ultrasound***
- **Endoscopic ultrasound (EUS)** is the gold standard for **locoregional staging**, providing the highest accuracy for determining the **depth of tumor invasion (T-stage)** and assessing **regional lymph nodes (N-stage)**.
- It is critical for determining whether the tumor is **resectable** and identifying candidates for **neoadjuvant chemotherapy** or chemoradiotherapy based on the invasion depth.
*Laparoscopy for peritoneal staging*
- Staging laparoscopy is primarily used to detect **occult peritoneal metastases** that are not visible on CT, especially in **gastric** or Siewert type III junctional tumors.
- While important, **EUS** is usually prioritized first to evaluate the primary tumor's wall invasion and local nodal status.
*Repeat endoscopy with endoscopic mucosal resection*
- **Endoscopic mucosal resection (EMR)** is a therapeutic and staging tool indicated for **early-stage (T1a)** lesions confined to the mucosa.
- Given the **4 cm size** and suspicious appearance on initial endoscopy, this lesion is likely too advanced for EMR to be appropriate or curative.
*Bronchoscopy to assess airway involvement*
- Bronchoscopy is typically reserved for tumors located in the **upper or mid-oesophagus** to rule out **tracheobronchial tree** invasion.
- Tumor involvement of the airway is very unlikely for an **adenocarcinoma** located at the **gastro-oesophageal junction**.
*PET-CT scan*
- **PET-CT** is highly effective at identifying **distant metastatic disease (M-stage)** that may have been missed on a conventional CT scan.
- Although it identifies metabolic activity, it lacks the resolution of **EUS** for distinguishing the specific layers of the esophageal wall to determine the precise **T-stage**.
Question 76: A 58-year-old man with chronic pancreatitis due to alcohol excess presents with worsening abdominal pain and steatorrhoea. He has lost 8 kg over 6 months. Faecal elastase-1 is <15 μg/g stool (normal >200 μg/g). CT pancreas shows pancreatic atrophy and calcification. He is commenced on pancreatic enzyme replacement therapy. Which additional supplementation is most important to prescribe?
A. Fat-soluble vitamins (A, D, E, K) (Correct Answer)
B. Vitamin B12 injections
C. Oral iron supplementation
D. Medium-chain triglyceride supplements
E. Vitamin C and zinc
Explanation: ***Fat-soluble vitamins (A, D, E, K)***
- Chronic pancreatitis causes **pancreatic exocrine insufficiency (PEI)**, leading to fat malabsorption and significant deficiency of **vitamins A, D, E, and K**.
- Supplementation is crucial to prevent serious complications such as **osteoporosis** (Vitamin D deficiency), **night blindness** (Vitamin A deficiency), and **coagulopathy** (Vitamin K deficiency).
*Vitamin B12 injections*
- While pancreatic enzymes facilitate the release of **vitamin B12 from R-binders**, **intrinsic factor** from the stomach is the primary determinant for B12 absorption, which is typically unaffected in chronic pancreatitis.
- Clinically significant B12 deficiency is less common in PEI compared to fat-soluble vitamin deficiencies, making it a lower priority for routine initial supplementation.
*Oral iron supplementation*
- Iron absorption primarily occurs in the **duodenum** and is not directly dependent on pancreatic enzyme activity.
- **Iron deficiency** is not a characteristic feature of pancreatic exocrine insufficiency unless there's an underlying cause like gastrointestinal bleeding.
*Medium-chain triglyceride supplements*
- **Medium-chain triglycerides (MCTs)** are absorbed directly into the portal circulation without requiring pancreatic lipase, making them useful for caloric supplementation in malabsorption.
- However, MCTs do not address the crucial deficiency of **fat-soluble vitamins**, which is a more direct and clinically urgent consequence of severe fat malabsorption.
*Vitamin C and zinc*
- **Vitamin C** is a water-soluble vitamin, and its absorption is generally not impaired in pancreatic exocrine insufficiency.
- While **zinc deficiency** can occur with general malabsorption, it is not the primary or most critical deficiency associated with chronic pancreatitis and fat malabsorption compared to fat-soluble vitamins.
Question 77: A 46-year-old man with alcohol-related cirrhosis and recurrent ascites undergoes large volume paracentesis with removal of 8 litres of ascitic fluid. Which intervention has been shown to reduce the risk of post-paracentesis circulatory dysfunction and improve mortality?
A. Administration of 8g of 20% human albumin solution per litre of fluid removed (Correct Answer)
B. Fluid restriction to <1 litre daily for 48 hours post-procedure
C. Infusion of gelofusine or other synthetic plasma expanders
D. Prophylactic terlipressin infusion during and after paracentesis
E. Rapid IV crystalloid replacement equal to volume removed
Explanation: ***Administration of 8g of 20% human albumin solution per litre of fluid removed***
- **Human albumin** administration is the gold standard for preventing **post-paracentesis circulatory dysfunction (PPCD)** when removing more than 5 litres of ascitic fluid.
- It acts as an effective plasma expander that preserves **effective arterial blood volume**, reducing the risks of renal impairment and mortality.
*Fluid restriction to <1 litre daily for 48 hours post-procedure*
- Fluid restriction is commonly used to manage **dilutional hyponatremia** in cirrhosis but does not prevent the hemodynamics-driven PPCD.
- Restricting fluids following a large volume removal may exacerbate **intravascular depletion** and trigger acute kidney injury.
*Infusion of gelofusine or other synthetic plasma expanders*
- Synthetic colloids like **gelofusine**, dextran, or polygeline are significantly less effective than **albumin** in reducing the incidence of PPCD.
- Clinical trials have shown that patients receiving synthetic expanders have higher rates of **renal dysfunction** compared to those receiving albumin.
*Prophylactic terlipressin infusion during and after paracentesis*
- **Terlipressin** is a potent vasoconstrictor indicated for **hepatorenal syndrome** (HRS) and variceal bleeding, not as a routine replacement for large volume paracentesis.
- While it addresses splanchnic vasodilation, it has not replaced **albumin** as the first-line intervention for volume expansion in this context.
*Rapid IV crystalloid replacement equal to volume removed*
- **Crystalloids** (like normal saline) are inefficient because they rapidly redistribute into the **interstitial space**, failing to maintain oncotic pressure.
- Using crystalloids for paracentesis volumes >5L is associated with a high rate of **post-procedure complications** and does not improve mortality.
Question 78: A 39-year-old woman presents with a 14-month history of crampy abdominal pain, bloating worse after meals, and loose stools 3-4 times daily. Symptoms improve when she avoids eating and are not present at night. She has no rectal bleeding or weight loss. Physical examination is normal. Blood tests including FBC, CRP, thyroid function, and tissue transglutaminase antibodies are normal. According to NICE guidelines for IBS diagnosis, which of the following additional criteria must be present for at least 6 months?
A. Abdominal pain relieved by defecation or associated with altered bowel frequency or stool form (Correct Answer)
B. Visible or occult blood in stool samples
C. Elevated faecal calprotectin above 100 μg/g
D. Evidence of lactose intolerance on hydrogen breath testing
E. Radiological evidence of colonic dysmotility on transit studies
Explanation: ***Abdominal pain relieved by defecation or associated with altered bowel frequency or stool form***- According to **NICE guidelines**, a diagnosis of **Irritable Bowel Syndrome (IBS)** should be considered only if there is **abdominal pain** for at least 6 months that is related to defecation or bowel habit change.- This must be accompanied by at least two of the following: **bloating**, mucus passage, **strained/urgent stool passage**, or symptoms worsening with meals.*Visible or occult blood in stool samples*- The presence of **rectal bleeding** is a **red flag** symptom that suggests organic pathology like **colorectal cancer** or inflammatory bowel disease (IBD).- IBS is a functional disorder, and finding blood in the stool necessitates urgent investigation rather than a primary diagnosis of IBS.*Elevated faecal calprotectin above 100 μg/g*- **Faecal calprotectin** is a marker of **intestinal inflammation** used to differentiate IBD from IBS in primary care.- An elevated level suggests **Crohn's disease** or **Ulcerative Colitis**, whereas IBS typically presents with a normal calprotectin level.*Evidence of lactose intolerance on hydrogen breath testing*- While **lactose intolerance** can cause similar symptoms like bloating and diarrhea, it is a distinct metabolic condition and not a diagnostic criterion for IBS.- NICE guidelines recommend excluding **Coeliac disease** and IBD via blood tests, but routine **hydrogen breath testing** is not required for an IBS diagnosis.*Radiological evidence of colonic dysmotility on transit studies*- **Colonic transit studies** are specialized investigations usually reserved for severe **chronic constipation** cases to identify slow-transit issues.- They are not part of the standard **NICE clinical criteria** for IBS, which relies on symptom patterns and the exclusion of organic disease.
Question 79: A 71-year-old man is admitted with haematemesis. He has a history of ischaemic heart disease and atrial fibrillation and takes warfarin. His INR is 3.8 and Hb 82 g/L. Following resuscitation and correction of coagulopathy, he undergoes endoscopy which reveals a 2 cm gastric ulcer with a visible vessel (Forrest IIa). The bleeding is controlled with endoscopic therapy. What is the most appropriate subsequent management regarding his anticoagulation?
A. Resume warfarin immediately post-endoscopy
B. Withhold warfarin for 2 weeks then restart
C. Switch to a low molecular weight heparin bridge and restart warfarin at 7-14 days (Correct Answer)
D. Stop anticoagulation permanently and commence aspirin only
E. Resume warfarin after 90 days once ulcer healing is confirmed
Explanation: ***Switch to a low molecular weight heparin bridge and restart warfarin at 7-14 days***- For patients with a high **thromboembolic risk** (e.g., **atrial fibrillation**), anticoagulation must be resumed cautiously to prevent **stroke** after haemostasis of a **Forrest IIa** lesion.- Using **LMWH bridging** allows for shorter-acting anticoagulation before transitioning back to **warfarin** once the high-risk period for rebleeding (typically the first 7 days) has passed.*Resume warfarin immediately post-endoscopy*- Immediate resumption of full **anticoagulation** significantly increases the risk of **early rebleeding** from the visible vessel before the ulcer has begun to heal.- Guidelines recommend a window of at least several days of **haemostatic stability** before restarting Vitamin K Antagonists for high-risk ulcers.*Withhold warfarin for 2 weeks then restart*- While waiting 2 weeks reduces rebleeding risk, withholding all forms of anticoagulation for this duration significantly increases the risk of **thromboembolic stroke** in an **atrial fibrillation** patient.- A **bridging strategy** is preferred over complete cessation to balance the risks of clotting versus bleeding.*Stop anticoagulation permanently and commence aspirin only*- Permanent cessation is generally contraindicated because the **ischaemic stroke** risk from **atrial fibrillation** far outweighs the long-term GI bleeding risk.- **Aspirin** is not an adequate substitute for anticoagulation in stroke prevention for patients with high-risk **atrial fibrillation**.*Resume warfarin after 90 days once ulcer healing is confirmed*- Waiting 90 days is far too long and leaves the patient unprotected against **systemic embolism** and cardiac complications for an unsafe duration.- Ulcer healing is monitored with **PPI therapy**, but anticoagulation is typically safe to resume much sooner once the **acute bleeding** phase is resolved.
Question 80: A 34-year-old woman presents with a 5-day history of worsening bloody diarrhoea (10-12 times daily), severe abdominal cramping, and fever. She has ulcerative colitis diagnosed 3 years ago. On examination, she appears unwell with temperature 38.2°C, pulse 115 bpm, BP 110/70 mmHg. Her abdomen is distended with tenderness but no guarding. Blood tests show: Hb 98 g/L, WBC 15.8 × 10⁹/L, platelets 420 × 10⁹/L, CRP 145 mg/L, albumin 28 g/L. Abdominal X-ray shows colonic dilatation with transverse colon diameter of 6.2 cm. What is the most appropriate immediate management?
A. Commence IV hydrocortisone, IV fluids, nil by mouth, and surgical review (Correct Answer)
B. Commence IV infliximab as rescue therapy
C. Commence broad-spectrum antibiotics and arrange emergency colectomy
D. Commence oral prednisolone 40 mg daily and arrange urgent flexible sigmoidoscopy
E. Arrange urgent CT abdomen to assess for perforation
Explanation: ***Commence IV hydrocortisone, IV fluids, nil by mouth, and surgical review***
- The patient has **acute severe ulcerative colitis** complicated by **toxic megacolon** (colonic diameter >6 cm), requiring urgent resuscitation and high-dose **IV corticosteroids**.
- **Surgical review** is essential as toxic megacolon carries a high risk of **perforation**, and failure of medical therapy within 72 hours often necessitates emergency surgery.
*Commence IV infliximab as rescue therapy*
- **Infliximab** or cyclosporine are considered **rescue therapies** if there is no response to IV steroids after 3-5 days; they are not the first-line immediate step.
- Administering biologics without first stabilising the patient with **fluid resuscitation** and steroids in the face of possible toxic megacolon is premature.
*Commence broad-spectrum antibiotics and arrange emergency colectomy*
- **Emergency colectomy** is the definitive treatment if perforation occurs or if the patient fails to improve, but a trial of **intensive medical therapy** with steroids is usually initiated first.
- While antibiotics are often used in toxic megacolon, they are an **adjunct** rather than the primary life-saving intervention over steroids and fluid resuscitation.
*Commence oral prednisolone 40 mg daily and arrange urgent flexible sigmoidoscopy*
- **Oral medications** are insufficient for acute severe colitis; **IV hydrocortisone** is mandated by the Truelove and Witts criteria for systemic symptoms.
- Performing a **flexible sigmoidoscopy** is contraindicated in the setting of **toxic megacolon** (6.2 cm dilation) due to an extremely high risk of bowel perforation.
*Arrange urgent CT abdomen to assess for perforation*
- While a CT may be useful to confirm free air, the diagnosis of **toxic megacolon** is already confirmed by the **abdominal X-ray** showing 6.2 cm dilatation.
- Delaying the start of **IV steroids and surgical consultation** for further imaging in a clinically unstable patient with known dilatation is inappropriate.
