Page 11 of 12
DR14.1-3 | Urticaria Angioedema — Assignment
CLINICAL SCENARIO
You are asked to construct a structured clinical management narrative for a real patient with urticaria and/or angioedema. This assignment develops your ability to integrate classification, pathogenesis, differential diagnosis, investigation strategy, and guideline-based management into a coherent clinical write-up — the kind of reasoning expected of a final-year MBBS student entering postings.
Instructions
Read the following clinical vignette carefully. Then complete each section of the structured response. Use evidence-based reasoning and cite your rationale. Avoid copying definitions verbatim — the assessors are looking for applied understanding, not recall.
Vignette: Mrs Priya, a 34-year-old schoolteacher, presents to your dermatology outpatient clinic with a 10-week history of daily itchy hives. Individual lesions last 3–5 hours and resolve completely without marks. She has not identified a consistent food, drug, or environmental trigger. She tried chlorpheniramine (4 mg three times a day) from a pharmacy for 2 weeks with only partial relief. She reports significant drowsiness affecting her teaching. She has no systemic symptoms, no family history of angioedema, and is currently on no prescription medications. Examination reveals multiple urticarial plaques on the trunk and limbs; there is no lymphadenopathy, no hepatosplenomegaly, and dermoscopy shows no vasculitic features.
Length: Total: 950–1,200 words across all six sections. Adhere to section word ranges — over- or under-writing a section suggests poor structure. Use plain, precise clinical language; avoid lists except where specifically useful.
What to Submit
Classify Mrs Priya's urticaria using the standard two-axis classification system (duration axis and trigger axis). Justify each axis with specific data from the vignette. State what additional single question you would ask to complete the classification and explain why.
Describe the pathogenesis underlying Mrs Priya's wheals at the cellular and mediator level. Explain which mediator is primarily responsible, how it produces the clinical features of itch and transient oedema, and why individual lesions resolve spontaneously within hours. Briefly explain why her wheals do NOT leave residual marks or bruising.
List three conditions that can mimic urticaria. For each, state the single most important clinical or investigative feature that would distinguish it from ordinary urticaria in Mrs Priya's case. Explain whether any feature in the vignette already excludes each mimic.
Propose a targeted investigation strategy for Mrs Priya. State which investigations you would order first, the clinical rationale for each, and which investigations you would NOT order at this stage and why. Use guideline-based reasoning (EAACI or IADVL).
Construct a stepwise management plan for Mrs Priya. Address: (a) the problem with her current antihistamine and what you would switch to; (b) the standard starting dose and expected response timeline; (c) what you would do if she fails to respond adequately after 4 weeks; (d) when omalizumab would be appropriate; and (e) one piece of lifestyle and avoidance advice specific to her occupation as a teacher.
What is the single most important clinical error to avoid in managing a patient with urticaria and associated angioedema? Explain the physiological basis for this error and what specific clinical features would prompt you to change your management immediately.
Grading Rubric — Urticaria Angioedema Assignment Rubric
| Criterion | Points | Full-marks descriptor |
|---|---|---|
| Classification accuracy and justification (Section 1): Correctly applies both classification axes with vignette-specific evidence; identifies the correct additional question and rationale | 20 pts | Both axes correctly classified with specific vignette evidence. Duration ≥6 weeks = chronic; no physical trigger = spontaneous. Appropriate additional question identified (e.g., whether a physical trigger can be demonstrated, or clarification of total illness duration) with precise rationale. |
| Pathogenesis depth and accuracy (Section 2): Correctly identifies mast-cell histamine release mechanism, H1-receptor mediation of itch and oedema, and explains why lesions resolve without scarring | 20 pts | Accurate mechanistic account: mast-cell degranulation → histamine → H1-receptor activation on postcapillary venules → vasodilation + increased permeability → transudation → wheal. Spontaneous resolution explained (mediator half-life/catabolism). No scarring explained (superficial oedema without structural damage). |
| Differential diagnosis quality (Section 3): Identifies three relevant mimics with a discriminating feature and applies it to the vignette | 20 pts | Three relevant mimics identified (e.g., urticarial vasculitis, contact dermatitis, angioedema alone/HAE, insect bites). For each, the single most discriminating feature is precisely stated and correctly applied to the vignette (e.g., vasculitis lesions last >24 h with residual marks — excluded by Mrs Priya's <24 h resolution without marks). |
| Investigation strategy (Section 4): Proposes targeted guideline-based investigations with clear rationale; avoids over-investigation | 20 pts | Recommends limited targeted screen (CBC, ESR/CRP, TFT ± anti-TPO) with specific rationale for each. Explicitly states tests NOT to order (comprehensive allergen panel) and explains why (low yield, does not change management). References EAACI or IADVL guideline principle. |
| Management plan completeness and safety (Section 5 + Section 6): Correct drug switch rationale, stepwise ladder, omalizumab threshold, and recognises anaphylaxis/angioedema safety imperative | 20 pts | Identifies problem with chlorpheniramine (sedation, first-generation agent not first-line). Switches to second-generation antihistamine with standard dose. Describes up-dosing step if partial response. Correctly identifies omalizumab threshold (refractory to up-dosed 2nd-gen antihistamine). Section 6 correctly identifies antihistamine use in anaphylaxis/airway angioedema as the critical error; names adrenaline as the correct response with features that trigger the switch (stridor, hypotension, tongue swelling). |
PEER REVIEW
Review your peer's assignment against the rubric. For each section: (1) identify the strongest argument or piece of reasoning; (2) identify one specific factual or reasoning gap; (3) assign a score using the rubric descriptors with a brief written justification. Your review should be constructive and specific — vague praise or generic criticism is not acceptable. Target 300–400 words for your written peer review. You will be assessed on the quality of your feedback, not on how generously or harshly you score.