ECG 4 - Cardiac Axis

Question 1

Axis devs are not significant in themselves
yet they’re presence should alert you to look for signs of ??? and ???, or other causes such as a ? ? (right axis dev) or ? defects (left axis dev)

normal depol pattern means ?+?+? are all ? but deflection greater in ? than in others - ? can be negative and still normal

Answer 1

RVH
LVH
PE
conduction

1
2
3
positive
2 
3

Question 2

RVH

• leads to ? axis dev
• which leads neg and which pos and which largest deflection
• tall ? waves where?

Answer 2

right for reaching
1 neg
2 pos
3 pos and largest
r
V1

Question 3

LVH

• leads to ? axis dev
• which leads are neg which pos and which largest deflection - must be ? leads to be significant

this pattern is more commonly from ?? than LVH

-tall ? waves in ?

Answer 3

left for leaving
1 pos
2 neg
3 neg
both
conduction defects

r
V6

Question 4

LVH voltage criteria
-? height of r wave in ? or ? and the depth of the ? wave in ? should not exceed ?mm (>? mm combined = LVH)

A classic sign of rvh is the ? point (when r and s waves are equal, normally at V3/4) moving to as far as ?/? - known as ? rotation
-rvh - also gives RBBB

Answer 4

combined
V5/V6
s 
V1
25
35
transition
V5/6
clockwise