Not sure about the part of 100% reversal of the effects, there are several different types of stroke so that would be a bit of an exaggeration I think.
However there is no doubt that quickly identifying a stroke victim is essential for improving the odds of a full or nearly full recovery so the tips above are still really good to know, thanks sunils.
If you are interested in knowing more and about the treatments (therapeutic hypothermia being one of them) check out this page on wikipedia, some really interesting information there ;-)
http://en.wikipedia.org/wiki/Stroke#Early_assessment