what is an ischemic stroke, describing in detail of what it is and what it does to the body.

what is an ischemic stroke, describing in detail of what it is and what it does to the body. and then how we can treat it in the pre-hospital setting as in what to look for like signs and symptoms of stroke, ways to identify storke and treatment for it in the field on the ambulance for paramedics. Then how hospitals can treat stroke in the hospital setting. like the treatment for stroke in the hospital basiclly. then just conclude with how it is important to properly assess stroke patients in the prehospital setting so the patient can have the best outcome. i need 3 cited resourses and they need to be from 2015 or newer.