ventricular tachycardia
"Propafenone has been very effective in reducing incidents of tachycardia, though of late I've had an increasing number of breakthrough events (perhaps once a week), especially after going to bed.  My heart rate reaches 120-130 bpm.  I usually return to sinus rhythm following carotid massage.  If necessary, I take a small dose of metroprolol, which works within 15 minutes.  I find it necessary to drink alcohol, coffee, and chocolate in moderation.  Before an ablation procedure, my main problem was periodic atrial fib."