Axis Flashcards
1
Q
- reveals the mean vector of conduction through the
- Only defined by the frontal plane (limb leads)
- If this is not normal (where the predicted mean vector should be) then this could indicate an underlying structural problem with ventricles
- A quick and easy assessment of ventricular size and structure
what is this describing?
A
Axis
1
Q
what leads make up the borders of the normal axis quadrants?
A
I + aVF
2
Q
what is the axis?
A
RAD
3
Q
Leads I and aVF would be what for LAD?
A
Lead I - positive
aVF - negative
4
Q
Leads I and aVF would look like what in extreme RAD?
A
BOTH negative
5
Q
how do you precisely define the axis?
A
- Only if there is limb lead has a QRS complex which is “isoelectric”
- the degree of lead is perpendicular to the degree of the axis
- So you would add or subtract 90 to get precise degree of axis
- Usually not necessary, as long as you can determine the general axis direction (normal, right axis deviation, left axis deviation, or extreme right axis deviation)
