neuron & blood supply

...where should i start..?
Stroke.. this one has no symptom..
This time it is dealing with the blood supply to the brain. I was informed that this one have 2 types; the hemorrhage type (cause blood vessel burst & the patient died immediately) & .... (uhm, o forgot, but this one will lowering function of movement starting from legs, then spread to arms & hands, then the fingers feel no sensation if it touches something, followed by facial problem.. ask the patient to smile or grin, & you see asymmetric (unequal-shape) smile)
There's lots of cause: unknown, hypertension (blood pressure reading above 120/80mmHg?), bad diet(high fat, low fibers..), smoking,...
In the 2nd type, it happen because of neuron sensitivity to supply...
Neuron will immediately die if they are lack of oxygen & glucose (mainly).. when one die, nothing can be seen, but when a group or maybe even large group of death, the area cannot do it's work, & there'll be 'power failure' to the part the area supply.. Just like the main generator is being destroyed, & no power supply goes to the area they supply. When there's no supply, how to move the area to life?