Can Sodium or Calcium Channel Blockers Worsen SVT?

[MeganMN]

Okay, so I have a new med that I am trying, Propafenone. I have failed Norpace and also Flecainide. The problem I am having is that it seems that these medicines are making the SVT worse. I have Atrial Tachycardia. I cannot find any information about this. Where can I get more information? My doctor seems to be questioning this but it is very definitely happening with the meds.

[Buffafly]

That is why Flecainide is supposed to be taken in combo with a beta blocker or calcium channel blocker - it is proarrhythmic! Propafenone is supposed to have the prevention ‘built in’ but I still developed atrial tachycardia with it.

[MeganMN]

Can anyone explain the physiology of why it causes atrial tachycardia?

[pip_pip]

I had serious problems with propofenone, a few years back. It made my AF, what little I had then, ultra fast tachycardia and found myself in hospital yet again with difficulty of reducing the rate of 150+. IF this happens it is best to stop the drug and contact the cardiology quick.

Phil

[MeganMN in reply to pip_pip]

Did they have any idea why? I am just so puzzled as to why the medications that they keep giving me to decrease my SVT are causing an increase. It is worth a head scratching!