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SVT

Is there a certain thing that starts off SVT? I thought I read once that pacs trigger it? Is that true? Do pvcs trigger also?
9 Responses
1124887 tn?1313754891
Pacs trigger the specific forms of SVT named AVNRT and AVRT (wpw). In those cases, there are two pathways connecting the atrias and ventricles, one with longer refractory time, so a pac can cause reentry if it fires while one pathway is refractory and the other is not. I don't think PVCs can trigger it. But maybe some of your PVCs are aberrant pacs?

1464004 tn?1384135733
Hi, if you've read any of my stuff on here you know I'm having a helluva time with my PSVT. I also have the usual PAC/PVCs. I've never heard of them triggering the PSVT but I've heard nearly everything else does. Caffeine, too much food, not enough sleep even moving a certain way. I've been trying to alter all these things along with my meds and finally going to see an EP to figure out what to do. Don't really want an ablation but may have to get one after all.
Avatar universal
Thank you guys. Hmmmm-- see there is this one bizarre feeling -very much like pvcs but believe it or not, its more "creepy" feeling. I feel this sooooo rarely--but it is the feeling that preceded the fast rate I had once. Of course I NEVER can catch it on a monitor, so docs say its all good. Is AVNRT and AVRT diagnosed by anything in particular? By that I mean do I have to be in that funky rythm at the time I am on the monitor for them to catch it or would it show up on ekgs, like they say a prolonged qt would show up?
1423357 tn?1511085442
The EP who performed my study and ablation told me that (in my case) there's a direct correlation between PVCs and the onset of SVT.  He said that it take precise timing of the PVC to initiate an event.  Since my ablation 4 months ago for AVRT, I continue to experience cluster of PVCs, but it no longer triggers an event,
1423357 tn?1511085442
To answer the second part of your question.  Again in my case, my EKG showed a very small marker indicative of WPW, but most of the cardiologists who examined me said my trace looked very normal.  The results of the study however indicated that I had a concealed pathway that revealed itself only when triggered.  In may case it turned out not to be WPW, and Circular Movement Tachycardia, another form of AVRT.  So yes, I'd say it's possible for you to have a farily normal looking EKG and still have some kind of concealed condition.
Avatar universal
Hmmm- well-- interesting---they say it takes a precise timing for pvc to cause svt--yet--you had that and I (think) mine did also---yet they say it takes precise timing for vt to turned to vfib also. Not very comforting here. lol
As to the second part--ugh-I feel like basically unless you are at the right place at the right time, they wont find anything.
Thank you I appreciate your answer. :)
1423357 tn?1511085442
"As to the second part--ugh-I feel like basically unless you are at the right place at the right time, they wont find anything."

Yes, and that's the exact reason my cardiologist always wanted me to drive to the ER when I had an event so it could be observed.  I alwasy rushed to convert it instead!  I eventually got a wearable 30 day monitor, and that's how they finally saw it in action.
Avatar universal
But going to the ER it's already started and they won't be  able to tell if anything in particular initiated it.  30 days monitor is better because it would pick up anything that preceded the SVT.
1465650 tn?1316231160
in one answer : Everything!!!
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