Etiology Congenital Acquired 1869 Infectious 源自1869年的医疗仁道实践 Traumatic Caused by angiosclerosis Caused by dissecting of blood vessels
Etiology •Congenital •Acquired: Infectious Traumatic Caused by angiosclerosis Caused by disecting of blood vessels
Common Location anterior circulation: 85%95% anterior a. -30% 1869 posterior communicating a.-25% middle cerebral a. -20% 源自1869年的医疗仁道实践 e Posterior circulation: 5%15% basilar a-10% vertebrate a. -5%
Common Location •anterior circulation: 85%～95% anterior a. -30% posterior communicating a. -25% middle cerebral a. -20%； •Posterior circulation: 5% ～ 15% basilar a. -10%； vertebrate a. -5%
Risk factors °age 1869 o Genetic background . Homodynamic factors 源自1869年的医疗仁道实践 Defects in medial layer of blood vessels .Hypertension
Risk factors •age •Genetic background •Homodynamic factors •Defects in medial layer of blood vessels •Hypertension
Natural histol 1869 Ruptured: 7% die on the spot, 7% 源自1869年的医疗仁道实践 misdiagnosed Re-bleeding: peak at 7-10th days
Natural history •Ruptured :7% die on the spot,7% misdiagnosed •Re-bleeding: peak at 7-10th days
Pathology . SAH 1869 Intracranial hemorrhage .hydrocephalus 源自1869年的医疗仁道实践 cerebral vasospasm
Pathology •SAH •Intracranial hemorrhage •hydrocephalus •Cerebral vasospasm