A 32-year-old man with a 6-year history of ulcerative colitis (UC) presents with bloody diarrhea (8–10 stools/day), abdominal cramping, and fever (38.5°C). On examination, he is tachycardic (110/min) and has diffuse abdominal tenderness. Laboratory investigations show Hb 9.2 g/dL, WBC 14,500/μL, albumin 2.8 g/dL, and CRP 8.5 mg/dL. Sigmoidoscopy reveals continuous mucosal inflammation with ulceration and loss of haustra. What is the most appropriate immediate next step in management?

Explanation

## Clinical Scenario Analysis This patient presents with **moderate-to-severe ulcerative colitis** based on: - High stool frequency (8–10/day) with blood - Systemic signs: fever, tachycardia - Laboratory evidence of inflammation (elevated CRP, WBC) and nutritional compromise (low albumin, anemia) - Endoscopic findings: continuous inflammation with ulceration ## Management Algorithm for Acute UC Exacerbation ```mermaid flowchart TD A[Acute UC exacerbation]:::outcome --> B{Severity assessment}:::decision B -->|Mild| C[Topical + oral 5-ASA]:::action B -->|Moderate-Severe| D[IV corticosteroids + supportive care]:::action D --> E[IV fluids, electrolyte correction, transfusion if needed]:::action E --> F[Monitor for toxic megacolon, perforation]:::urgent F --> G{Response at 3-5 days?}:::decision G -->|Yes| H[Continue IV steroids, taper]:::action G -->|No| I[Rescue therapy: infliximab or cyclosporine]:::urgent ``` ## Why Intravenous Corticosteroids? **Key Point:** Moderate-to-severe UC exacerbations (≥6 stools/day + systemic toxicity) require **IV corticosteroids as first-line therapy**, not oral agents or biologics as monotherapy. **High-Yield:** The standard induction regimen is: - Methylprednisolone 1 g IV daily (or hydrocortisone 100 mg IV QID) for 3–5 days - Concurrent supportive measures: IV fluids, electrolyte repletion, blood transfusion for Hb <7 g/dL - Prophylactic antibiotics if signs of sepsis or toxic megacolon suspected **Clinical Pearl:** Response is assessed at **day 3–5**: - If responding: continue IV steroids and taper over 2–3 weeks - If no response: escalate to rescue therapy (infliximab or cyclosporine) **Warning:** Do NOT delay IV steroids while awaiting colonoscopy — the acute phase takes priority. Sigmoidoscopy has already confirmed the diagnosis and extent; full colonoscopy can be deferred until remission to assess for dysplasia or malignancy. ## Rationale for Each Step | Step | Timing | Indication | |------|--------|------------| | IV corticosteroids | Immediate | Moderate-severe exacerbation | | Supportive care (fluids, blood products) | Concurrent | Correct anemia, dehydration, electrolyte abnormalities | | Assess response | Day 3–5 | Determine need for rescue therapy | | Maintenance therapy (5-ASA, azathioprine) | After remission | Prevent relapse; NOT for acute induction | [cite:Harrison 21e Ch 295]