U01.01.035 Ehlers-Danlos syndrome

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Learning Objectives

  • Identify the hallmark triad of Ehlers-Danlos Syndrome symptoms.
  • Distinguish between the Classical and Vascular types of EDS.
  • Correlate specific collagen mutations with their respective clinical presentations.
  • Understand the life-threatening complications associated with Vascular EDS.

1. Pathophysiology and General Features

Ehlers-Danlos Syndrome is a group of connective tissue disorders caused by faulty collagen synthesis. While inheritance varies (Autosomal Dominant or Recessive), the general presentation involves structural weakness in skin, joints, and vessels.

  • Hyperextensible Skin: Skin is often thin, transparent, and stretches significantly beyond normal limits.
  • Hypermobile Joints: Severe joint instability and frequent dislocations.
  • Easy Bruising: Tendency to bleed or bruise easily due to fragile perivascular connective tissue.

2. Major Clinical Subtypes

There are multiple types of EDS, but the following three are high-yield for examinations:

Type Defect Clinical Clues
Hypermobility Type Unknown/Various Most common type; primarily affects joint stability.
Classical Type Mutation in Type V Collagen (e.g., COL5A1, COL5A2) Significant skin and joint symptoms; “cigarette paper” scarring.
Vascular Type Mutation in Type III Procollagen (e.g., COL3A1) Fragile tissues, aortic/berry aneurysms, and organ rupture (e.g., gravid uterus).

3. Clinical High-Yields: Processing & Risks

  • Enzyme Deficiency: One form of EDS can be caused by a deficiency in procollagen peptidase, the enzyme responsible for cleaving terminal propeptides in the extracellular space.
  • Vascular Warning: Vascular EDS is the most dangerous form. Patients are prone to spontaneous vessel rupture (including the aorta) and hollow organ rupture.

4. EDS vs. Marfan Syndrome

While both involve joint hypermobility, EDS is a primary collagen defect. Marfan syndrome is a fibrillin-1 defect. Patients with EDS typically do not have the tall stature or lens dislocation (ectopia lentis) seen in Marfan patients.

 

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