Not unless their heart has stopped. Strokes typically result in a blood vessel blockage in the brain, which then deprives the brain of oxygen. This starves the cells and can lead to permanent brain damage, stoppage of various organs in the body, or death. Strokes do not always lead to the heart stopping, hence why you should absolutely check for a carotid pulse before beginning CPR on anyone. A stroke is basically the same thing as a heart attack just up in your grey goo. For some reason blood flow to a particular area has been interrupted and now the cells are dying.

But more importantly, doing CPR on someone whose heart is beating can cause it to stop. That's why in medical dramas it's always so obvious they're not really pushing on the other actor's chest even the slightest bit. When I was in high school, a group of boys were playing a "let's punch each other as hard as we can in the chest" game, and one of them keeled over dead. True story.

I may have pushed too hard. :o

Pectus excavatum.