WPW and av nodal blockers

[DieselBolus17]

So I understand in wpw there is an accessory pathway from the atria to the ventricles beside the av node, which has no pause. When conducting, the impulse travels down the av node and accessory pathway from what I understand. Now is where I get confused, if the impulse is being conducted down both places down to the ventricles, why are av nodal blockers dangerous? The impulse is being conducted already, why would blocking the av node be an issue if it was being conducted regardless?? Does the impulse from accessory path cancel itself out when meeting the impulse from the av node somewhere in the ventricle? Sorry if the question doesn't make sense, just having a hard time grasping that.

 

[teedubbyaw]

Here ya go
http://emtlife.com/threads/drugs-that-slow-block-conduction-at-the-av-node-and-wpw.36676/

 

[Brandon O]

Here ya go
http://emtlife.com/threads/drugs-that-slow-block-conduction-at-the-av-node-and-wpw.36676/

That was one of our better threads...

 

[teedubbyaw]

That was one of our better threads...

I still need to re-read it since I've long forgotten that stuff.

 

[Brandon O]

I still need to re-read it since I've long forgotten that stuff.

It's only a real problem when you're rereading something you yourself wrote, just because you've forgotten it completely and you know that you probably explained it in a way you understood (even if nobody else did)...

 

[Handsome Robb]

That is a great thread. There's a few of 'me buried in here.