- Anything that lowers bp below critical level
- Often superimposed on pre-existing cerebral vascular disease
 
   
           
        
        
        
        
        
          
          
            
  
      
    
    
      
        
            - Highest risk of ischemia and infarct in distal areas/those supplied by atherosclerotic vessels
- Can also cause global insults as hypotension affects overall perfusion
 
   
           
        
        
        
          
          
            
  
      
    
    
      
        
            - General effect from global hypo-perfusion
- Can also cause discrete deficits from focal ischemia