someone plz explain SVT vs Wolff parkrison

[sadaca]

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Hey guys, can someone plz expalin wolff parkinson white vs SVT vs. Torsades de pointes. I know all these are similar and interconnected. I am studying for step1 and get mixed up with those.
I would really appreciate it

 

[notbobtrustme]

Wolff-Parkinson-White has an additional conductance system (bundle of kent). This additional center has a lower threshold, so it's easier to enter arrhythmias. It has a characteristic 'delta wave' on EKGs. There are some anti-arrhymatics contraindicated in this, I believe beta-blockers and calcium-blockers are the ones C/I.

SVT refers to any tachycardia originating in the AV or SA node. Class IB is best to alleviate these tachys.

Torsades is uncoordinated ventricular depolarizations, It's basically QRS complexes gone wild.

 

[ChessMaster3000]

SVT refers to any tachycardia originating in the AV or SA node. Class IB is best to alleviate these tachys.

Yep, also digoxin. All decrease conduction thru the AV node which increases anterograde conduction thru the bundle of kent

 

[sadaca]

thank you! So SVT is a type of torsades de pointes ?

 

[sadaca]

And AFIB leads to SVT

 

[Transposony]

The key difference between WPWS and others is that WPWS is a reentrant tachycardia.

 

[sadaca]

ok great, thanks alot

 

[ChessMaster3000]

The key difference between WPWS and others is that WPWS is a reentrant tachycardia.

There is also AV nodal reentrant tachycardia though right--that is also a reentrant SVT

 

[notbobtrustme]

thank you! So SVT is a type of torsades de pointes ?

I wouldn't phrase it that way. I'd say that SVT can lead to TDP, but TDP is a different sign all together.

Afib is a type of SVT.

 

[Transposony]

There is also AV nodal reentrant tachycardia though right--that is also a reentrant SVT

Correct.

 

[SA node 12345]

Dr sadaca
You can differentiate these three from each other just by looking at their characteristic ECG s. If you don't understand their mechanisms, it is not as bad as doesn't recognize them by ECG.

 

[notbobtrustme]

Dr sadaca
You can differentiate these three from each other just by looking at their characteristic ECG s. If you don't understand their mechanisms, it is not as bad as doesn't recognize them by ECG.

ya but for Step 1, you might not be given an EKG, so you have to discern it from signs/symptoms.

 

[ChessMaster3000]

ya but for Step 1, you might not be given an EKG, so you have to discern it from signs/symptoms.

there is no way to diagnose a patient with wpw without an ekg. the best cardiologist in the world cannot discern that on clinical presentation. in fact, its probably impossible to diagnose an svt vs ventricular tachycardia on signs/symptoms alone.

 

[notbobtrustme]

there is no way to diagnose a patient with wpw without an ekg. the best cardiologist in the world cannot discern that on clinical presentation. in fact, its probably impossible to diagnose an svt vs ventricular tachycardia on signs/symptoms alone.

might be true, but I was thinking more along the lines of Uworld, where they describe the EKG findings back to you without actually letting you see the strip. That's what I meant.