What are the risk factors for developing a subarachnoid haemorrhage (SAH)?

Individual Factors
  • Female gender
  • Age (peak incidence 40-60)
  • Previous aneurysm or SAH
  • Family history
  • Smoking
  • OCP
  • Alcohol abuse
Parenchymal
  • Hypertension:
    • Atherosclerotic disease
    • Cocaine or sympathomimetic use
  • Connective tissue disorders:
    • Marfan's syndrome
    • Ehlers-Danlos syndrome
    • Vasculitides
    • Alpha 1 anti-trypsin deficiency
  • Polycystic kidney disease
  • Coarctation of the aorta
  • Fibromuscular dysplasia
  • Neurofibromatosis