Not really. Strokes are just one of those things where either it will happen or it wont. My grandmother had the same thing happen. One minute shes fine sitting on the couch on the phone the next she was slumped over after her stroke. Same condition as well, can't speak, move her left arm, walk alone, etc. There is no way to prevent it besides the basics everyone knows. Eat healthy, exercise, keep your cholesterol down, avoid stress, etc. Genetics play a part in it as well. I had a friend who had a heart condition all his life who ended up dying after having a stroke at 21 in the shower. No signs or symptoms either, just turned the water on got undressed and it hit em. There really isn't anything you can do to prepare for it except try to live healthy and accept that it might happen it might not, but your odds of it happening especially if you are under 40 and live healthy are extremely low (without any preexisting heart conditions that you'd know about by now). And if you do your regular checkups at the doctor they would be able to notice anything before it became a serious issue.