Hemiblocks (Johnston) Flashcards Preview

Cardiovascular Medicine-Unit 2 > Hemiblocks (Johnston) > Flashcards

Flashcards in Hemiblocks (Johnston) Deck (10):
1

What are some criteria for Left anterior hemiblock?

Left axis deviation (usually > -60)
Small Q in leads I and aVL, small R in II, III, and aVF
Usually normal QRS duration or slightly widened Q1S3 (Q in I and S in III)

2

In left anterior hemiblock, which leads will have small R waves?

II, III, aVF

3

In left anterior hemiblock which leads will have small Q waves?

I and aVL

4

Whats the axis deviation in left anterior hemiblock?

Left axis deviation

Look for I=up, aVF=down

5

What is the etiology of left posterior hemiblock?

Disease in conduction system

This is less common

6

What is the axis deviation in left posterior hemiblock?

Right axis (usually > or equal to 120 degrees)

I=down, aVF=up

7

In left posterior hemiblock, where do you have a small R?

Leads I and aVL

8

In left posterior hemiblock, where do you have a small Q?

Leads II, III, aVF

9

S1Q3 is associated with ___

Left posterior hemiblock

10

List etiologies of Left Anterior Hemiblock:

Disease in conduction system
Often associated with MI (Left anterior descending-LAD occlusion)