A 28-year-old woman presents to the orthopaedic clinic with a 2-year history of recurrent joint dislocations (shoulders, knees, fingers), hyperextensible skin, and easy bruising. Her mother had similar features and died of aortic rupture at age 42. On examination, she has skin hyperelasticity, positive Beighton score of 8/9, and a systolic murmur. Genetic testing confirms a mutation in COL3A1 gene. What is the most appropriate immediate next step in management?

Explanation

## Clinical Context This patient presents with classic features of **Ehlers–Danlos Syndrome Type IV (vascular EDS)**, caused by mutations in *COL3A1* gene encoding type III collagen. The key red flags are: - Recurrent joint/organ dislocations - Skin hyperelasticity and easy bruising - Family history of sudden death from aortic rupture - Cardiac murmur (aortic root dilatation) ## Pathophysiology of Type III Collagen Defects **Key Point:** Type III collagen is the predominant structural collagen in blood vessel walls, the GI tract, and skin. Mutations cause defective cross-linking and reduced tensile strength, leading to spontaneous arterial rupture, bowel perforation, and uterine rupture. ## Management Algorithm ```mermaid flowchart TD A[COL3A1 mutation confirmed]:::outcome --> B{Vascular EDS suspected?}:::decision B -->|Yes| C[Immediate echocardiography + aortic imaging]:::action C --> D[Beta-blocker ± ARB to reduce aortic shear stress]:::action D --> E[Avoid contact sports, NSAIDs, anticoagulation]:::action E --> F[Annual imaging surveillance]:::action B -->|No| G[Standard EDS management]:::action ``` ## Why This is the Correct Next Step **High-Yield:** Vascular EDS carries a 50% risk of major vascular event (aortic rupture, arterial dissection) by age 40. The presence of a systolic murmur + COL3A1 mutation + family history of sudden death makes aortic root dilatation highly likely. **Clinical Pearl:** Beta-blockers (e.g. propranolol 40–80 mg BD) reduce aortic wall shear stress (dP/dt) and have been shown to delay aortic complications. ARBs (losartan) are an alternative. Imaging must precede any surgical intervention. **Key Point:** Echocardiography establishes baseline aortic root diameter; CT/MRI angiography assesses for dissection or aneurysm. This is a medical emergency — delay increases rupture risk. ## Why Other Options Are Incorrect | Option | Why Wrong | |--------|----------| | Physiotherapy + annual orthopaedic follow-up | Addresses musculoskeletal symptoms but ignores life-threatening vascular risk. Vascular EDS requires urgent cardiac evaluation before any exercise prescription. | | Skin biopsy for electron microscopy | Electron microscopy showing "onion-skin" collagen fibrils would confirm vascular EDS, but genetic testing has already confirmed *COL3A1* mutation. Biopsy delays critical cardiac workup. | | NSAIDs + activity restriction | NSAIDs increase bleeding risk and are contraindicated. Activity restriction alone is insufficient without pharmacological vascular protection. | [cite:Robbins 10e Ch 7; Harrison 21e Ch 387]