I have been experiencing bouts of ventricular tachycardia and pvcs for a few years now, often reaching 270 bpm. I have only recently been diagnosed from an er visit when it wouldn't slow down for about an hour I have been unable to determine what the causes it to occur. I have been scheduled for a radio frequency ablation, however I have been told that I need to be experiencing pvcs or v-tach for them to be able to map out the heart and ablate the correct spot. but I sometimes go a week at a time without an occurrence. Has anyone else had a similar experience?