Master CPS - Gastroenterology/Nutrition
for MSRA

What the MSRA Tests in CPS - Gastroenterology/Nutrition

The MSRA CPS - Gastroenterology/Nutrition domain tests applied clinical decision-making in common and emergency GI presentations. Candidates must demonstrate knowledge of diagnostic criteria (e.g., Rome IV for IBS, modified Marshall score for acute pancreatitis), first-line pharmacological and endoscopic management, and when to escalate care. Key areas include dyspepsia and H. pylori management, inflammatory bowel disease (IBD) treatment algorithms (e.g., step-up vs. top-down), acute upper and lower GI bleeding (Rockall and Blatchford scores), coeliac disease serology and biopsy, liver disease (NAFLD fibrosis score, Child-Pugh, MELD), and nutritional support (NG vs. PEG, refeeding syndrome prevention). Emphasis is on UK guidelines (NICE, BSG, SIGN) and appropriate use of investigations (e.g., faecal calprotectin, CT colonography, MRCP).

High-Yield Concepts

• Dyspepsia and H. pylori Testing: NICE CG184: Test for H. pylori using carbon-13 urea breath test or stool antigen (not serology in acute setting). First-line eradication: 7-day triple therapy (PPI, amoxicillin 1g BD, clarithromycin 500mg BD OR metronidazole 400mg BD if penicillin allergy). Re-test with breath test 6 weeks after completion. If persistent symptoms, consider PPI trial or endoscopy if age >55 with alarm features.
• Acute Upper GI Bleeding Management: Use Blatchford score (pre-endoscopy) to assess need for urgent intervention: score >0 indicates need for endoscopy. Rockall score (post-endoscopy) predicts mortality. Initial resuscitation: IV access, cross-match, PPI infusion (80mg bolus + 8mg/h) if high-risk stigmata. Endoscopy within 24 hours for variceal and non-variceal bleeds. Terlipressin 2mg IV QDS for variceal bleed, with prophylactic antibiotics (e.g., ceftriaxone 1g OD).
• Inflammatory Bowel Disease (IBD) – First-Line Therapy: Mild-moderate ulcerative colitis: first-line mesalazine (e.g., 2.4g/day oral + enema if distal). Crohn's: budesonide 9mg OD for ileocaecal disease, or prednisolone 40mg OD for moderate disease. Step-up to anti-TNF (infliximab or adalimumab) if steroid-dependent or fistulising disease. Monitor for thiopurine-induced myelotoxicity (check TPMT before azathioprine).
• Coeliac Disease Diagnosis: NICE NG20: Serology first – IgA anti-tTG (with total IgA to exclude deficiency). If positive, refer for duodenal biopsy (Marsh grade ≥2 confirms). Do not start gluten-free diet before biopsy. Follow-up: repeat serology at 6-12 months to confirm adherence. Screen first-degree relatives.
• Acute Pancreatitis – Severity and Management: Diagnosis: 2 of 3 criteria (abdominal pain, amylase/lipase >3x ULN, imaging findings). Modified Glasgow score (≥3 = severe): age >55, WCC >15, glucose >10, LDH >600, albumin <32, Ca <2, urea >16, PaO2 <60. Management: aggressive IV fluids (Hartmann's 250-500ml/h first 12h), analgesia (morphine not contraindicated), CT with contrast at 72h if severe. ERCP within 24h if cholangitis or biliary obstruction.
• Non-Alcoholic Fatty Liver Disease (NAFLD) Risk Stratification: Use NAFLD fibrosis score (NFS) or FIB-4 to identify advanced fibrosis. NFS = -1.675 + 0.037×age + 0.094×BMI + 1.13×IFG/diabetes + 0.99×AST/ALT ratio – 0.013×platelet – 0.66×albumin. FIB-4 >3.25 suggests advanced fibrosis (refer for elastography). First-line management: weight loss ≥7%, treat metabolic syndrome, avoid alcohol. Pioglitazone or vitamin E (in non-diabetic NASH) considered in specialist settings.
• Irritable Bowel Syndrome (IBS) – Rome IV and Management: Rome IV criteria: recurrent abdominal pain (≥1 day/week for 3 months) associated with ≥2 of: related to defecation, change in stool frequency, or change in stool form. NICE CG61: first-line lifestyle advice, soluble fibre (ispaghula), and antispasmodics (e.g., mebeverine, peppermint oil). For constipation-predominant: linaclotide 290mcg OD or lubiprostone. For diarrhoea: loperamide, consider low-FODMAP diet under dietitian.
• Refeeding Syndrome – Prevention and Monitoring: NICE CG32: At-risk patients (e.g., nil by mouth >5 days, BMI <16, significant weight loss) need cautious refeeding. Check baseline electrolytes (K, Mg, PO4). Start at no more than 50% of estimated energy needs for first 48h, then increase by 200-300 kcal/day. Supplement thiamine 200-300mg daily for first 3 days. Monitor phosphate, Mg, K daily for first week. If refeeding hypophosphataemia occurs: reduce feed rate, give oral/IV phosphate supplements.

Common Traps in CPS - Gastroenterology/Nutrition Questions

• Confusing Blatchford (pre-endoscopy, uses urea and haemoglobin) with Rockall (post-endoscopy, uses age and comorbidities).
• Ordering H. pylori serology in acute dyspepsia – NICE advises against it due to false positives and inability to distinguish active from past infection.
• Starting a gluten-free diet before duodenal biopsy in suspected coeliac disease – this can normalise histology and prevent diagnosis.
• Using morphine for acute pancreatitis pain – it is safe and effective; the old fear of sphincter of Oddi spasm is not clinically significant.
• Forgetting to check TPMT before starting azathioprine in IBD – risk of severe myelotoxicity if deficient.
• Equating NAFLD with NASH – NAFLD is simple steatosis; NASH requires inflammation and ballooning on biopsy, with higher risk of fibrosis.

How to Revise CPS - Gastroenterology/Nutrition for the MSRA

For MSRA CPS, focus on NICE and BSG guideline-driven management algorithms. Questions often present a clinical scenario (e.g., 55-year-old with melaena, HR 110, BP 90/60) and ask the next step in management (e.g., endoscopy timing, transfusion threshold). Prioritise understanding severity scores (Blatchford, Glasgow, Child-Pugh) and when to escalate (e.g., acute pancreatitis with organ failure to ITU). Practise interpreting lab values (e.g., calprotectin >250 suggests IBD) and imaging results (CT colonography vs. colonoscopy). Revise drug doses and routes (e.g., terlipressin IV vs. octreotide SC) and common contraindications (e.g., NSAIDs in IBD). Use single-best-answer and multi-step reasoning questions from question banks, focusing on the 'why' behind each guideline.

Practise it: MedLumen has 50 CPS - Gastroenterology/Nutrition questions for the MSRA, each with a full explanation and references.