Preexcitation

Question 1

What is preexcitation?

Answer 1

Electrical current is conducted to the ventricles more quickly than usual

Question 2

Normally how long is the delay of depolarization at the AV node?

Answer 2

0.1 second

Question 3

How does preexcitation conduct more quickly?

Answer 3

Accessory pathways where the current bypasses the AV node and arrives at ventricles faster

Question 4

What is the accessory pathway of WPW?

Answer 4

bundle of Kent

Question 5

PR intervals less than .12 seconds and a slurred upstroke in a wide QRS is characteristic of

Answer 5

WPW

Question 6

What is a small area depolarized early that gives the QRS a slurred initial uptake?

Answer 6

Delta wave

Question 7

True of False:

Delta waves will be seen in all leads in WPW

Answer 7

False

- seen in some, scan all leads

Question 8

What is the accessory pathway of LGL?

Answer 8

James Fiber

-intranodal

Question 9

A short PR interval with normal QRS is characteristic of

Answer 9

LGL

Question 10

Why do we care about LGL or WPW?

Answer 10

Many pts do just fine

Predisposed to tachyarrhythmias