I've had this experience once last year. This is called PVC. http://en.wikipedia.org/wiki/Premature_ventricular_contraction http://en.wikipedia.org/wiki/Prematu

I've had this experience once last year. This is called PVC. http://en.wikipedia.org/wiki/Premature_ventricular_contraction http://en.wikipedia.org/wiki/Premature_ventricular_contracti... My doc says that a one-time is not dangerous, but if it starts happening more often it's cause for concern.