Urticaria and angioedema — branching viva

The examiner releases the topic in stages, beginning with a young child with acute itchy wheals after a viral illness, moving to a school-age child with daily wheals for eight weeks, then to recurrent facial swelling without a rash, and finally to a child with acute urticaria and hypotension. The candidate must state the diagnosis and mechanism before the action, apply the stepwise ladder, justify the bradykinin versus histamine split, and build a safe disposition at each stage.