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SAH (PDx & DDx (DDx (VIVID (Infective (Meningitis, Encephalitis,…

- - - - Vascular
        
        Intracerebral, sub-dural, extra-dural haemorrhage
        
        Cerebral infarction
      - Infective
        
        Meningitis
        
        Encephalitis
        
        Cerebral abscess
      - Vision-threatening
        
        Acute glaucoma
        
        Temporal arteritis
      - Raised ICP
        
        Space-occupying lesions
        
        Brain tumour
        
        Primary
        
        Secondary
        
        Cerebral oedema
      - Dissection
        
        Carotid artery dissection
- - - - Posterior circulation
        
        4% junction btwn PCA & basilar a.
      - Anterior circulation (85%)
        
        Predominantly in circle of willis
        
        34% bifurcation MCA
        
        20% Junction btwn PCOA and ICA
        
        40% - ACOM & ACA
  - - - Choroid plexus
        
        In ventricles
        Choroidal epithelial cells
        60-80%
      - Cerebral tissues
        
        Directly into ECF
        Flows into ventricles
        Central canal
    - - Lateral & median apertures
        
        Lateral = Foramen of Luschka
        
        Cerebropontine angle
        
        Median = Foramen of Magendie
        
        Cisterna Magna
- - - - Cerebral
        
        Vascular
        
        Rebleed
        
        Vasospasm
        
        Fluid
        
        Cerebral oedema
        
        Acute hydrocephalus
      - Non-cerebral
        
        Cardiorespiratory
        
        Pulmonary oedema
        
        Cardiac abnormalities (arrhythmias, ventricular wall abnormalities)
        
        Metabolic
        
        Hyperglycaemia
    - - Fever & seizures