Oncology and gastroenterology · FICTIONAL CASE

Diarrhoea on immunotherapy: checkpoint-inhibitor colitis

Recognise potentially serious immune-related colitis, exclude important differentials and use oncology-led toxicity pathways.

Toxicity grading and specialist coordination15 minutes0/3 decisions explored
PAUSE BEFORE USING

This is educational content, not a clinical protocol. Verify current guidance, use local pathways and seek appropriate senior or specialist help.

THE CASE

A fictional 63-year-old on combination checkpoint inhibitors presents with increasing diarrhoea, abdominal pain and reduced oral intake.

01 · INITIAL PRESENTATION

Listen for the assumption.

SHO

This is probably treatment-related, so I will prescribe symptomatic treatment and send the patient home.

Registrar

What must be assessed before calling it uncomplicated toxicity?

SHO

Severity, hydration, abdominal signs, infection and other causes. I will contact oncology and use the immune-toxicity pathway with gastroenterology input when needed.

WHERE IS THE CONSULTANT?

Choose an answer below and reveal the reasoning to see consultant feedback at every checkpoint. The full consultant-led synthesis follows after all three decisions.

Go to the first decision ↓
EVOLVING INFORMATION

The picture develops.

  1. Increasing stool frequency over baseline
  2. Abdominal pain and reduced intake
  3. Recent combination immune-checkpoint therapy
02 · DECISION CHECKPOINTS

Commit before you reveal.

After you select an option, reveal the model reasoning and the consultant’s feedback.

DECISION 1What should be evaluated in parallel?
DECISION 2Who should direct the treatment plan?
DECISION 3What is unsafe?
03 · CONSULTANT-LED SYNTHESIS

Hear the senior team refine the plan.

The registrar tests the plan, the consultant synthesises the key principle, and the SHO confirms the safer next steps.

Registrar

Ask about blood, fever, severe pain and fluid intake; assess for complications and arrange tests under the toxicity pathway.

Consultant

Treatment interruption and immunosuppression are grade-specific decisions. Do not publish a universal steroid or biologic regimen.

SHO

I will hand over therapy type, symptom trajectory, infection work-up, hydration and oncology advice.

CLINORA DECISION TRACE
01 · CUEProgressive diarrhoea and pain during checkpoint therapy
02 · INTERPRETPossible immune-related colitis with competing differentials
03 · ACTGrade, investigate and escalate through oncology
SAFETY CHECK

What must remain explicit.

  • Follow the current oncology immune-toxicity protocol.
  • Escalate severe pain, bleeding, fever, dehydration or systemic instability.
  • Avoid unqualified antidiarrhoeal or immunosuppressive advice.
COMMON ERRORS

Where reasoning fails.

  • Assuming a benign adverse effect
  • Missing infection
  • Ignoring hydration or abdominal examination
STRUCTURED HANDOVER
Possible ICI colitis: agent/regimen [details], stool/pain [trajectory], hydration [status], infection work-up [status] and oncology plan [name].
REFLECTIVE PAUSE

Which feature would stop you from managing this as routine diarrhoea?