Hi Athena...no, I don't think it is related to the CF..it just happened, I was in my 20's when I first started having SVT issues...just about passed out on the doc (I worked on a med surg unit at the time), the same doc who told me it was anxiety and the fact that I had two kids was causing my "palpitations". I guess he finally believed me as they were wheeling me to the ER. I wound up staying the night for observation after IV cardizem, digoxin. I now take Verapamil...I almost did the EPS studies because meds weren't working well, but finally we tried verapamil and have been relatively stable since. I don't know about you but mine also acts up when my potassium and magnesium levels are too low. What triggers yours besides albuterol? Hugs, Jenn <img src="i/expressions/face-icon-small-smile.gif" border="0">