Well the interesting thing about CVA's in the field you do not know if you have a bleed or ischemia, 12 lead evaluation of the patient can lead to some ekg changes with some cerebral bleeds which you would see severe ischemic changes in the V leads, it takes less than a minute to do a 12 lead and that can be done enroute to the stroke center, your treatment is going to be supportive anyway. Just remember you can have both an infarct and a stroke in some patients.