Is it common to die suddenly of ventricular fibrillation if i have wolff-parkinson-white syndrome and i'm on propranolol?

No,: If it is the typical WPW and on the correct medication I do not see ventricular fibrillation in your future. However, talk to your cardiologist which I am not (surgeon) as he will explain you to put you at ease. Ask him if your would be a good candidate for rf ablation. If that is a success you can be cured !

WPW: Most people with WPW have no problem with it. It can however cause vf if certain arrhythmia s like atrial fibrillation happen in a WPW patient. Propranolol decreases the risk of this. In patients with WPW arrhythmia, ablation can remove the visible pre excitation. Talk to your doc about your specific situation.