EKG preexcitation highlights

Question 1

Define preexcitation syndrome

Answer 1

Electrical impulse conducted to ventricles faster than usual

Question 2

Preexcitation electrical impulse conduction uses ___________________ to “bypass” the normal AV nodal delay, thus avoiding the delay and arriving at ventricles early

Answer 2

accessory pathways

Question 3

List the EKG findings for WPW

Answer 3

1) Shortened PR interval, specifically < 0.12 sec
2) Delta wave slightly widens QRS complex (>0.1 sec)
-The delta wave is the “short circuit” and is part of the QRS complex

Question 4

QRS complex in WPW is _____________ beat

Answer 4

combination

Question 5

WPW: Part of ventricle is depolarized early via accessory pathway resulting in delta wave (initial slurred upstroke of QRS complex); is this seen in all leads?

Answer 5

May only be seen in a few of the leads

Question 6

List 3 main findings in WPW

Answer 6

1) Short PR interval
2) Delta wave
3) Wide QRS

Question 7

How do you Dx WPW syndrome?

Answer 7

Classic ECG changes + symptoms

Question 8

What are the 2 most common tachyarrhythmias associated with WPW syndrome?

Answer 8

1) SVT (AVRT) for example WPW
2) Atrial Fibrillation

Question 9

1) What is the setup?
2) PAC may be conducted thru accessory pathway and up thru AV node….self sustaining….SVT with wide and bizarre QRS – often indistinguishable from ____ on ECG

Answer 9

1) Normal sinus beat followed by PAC
2) VT

Question 10

Describe SVT (AVRT) in WPW

Answer 10

1) Antegrade thru AV nodeorthodromic (correct or orthodox) reentry circuitQRS < 0.12 (narrow)
2) Looks like AVNRT – regular fast SV rhythm