Ch. 7: Axis and degrees Flashcards
1
Q
Axis
A
direction of movement of depolarization
2
Q
Means QRS Vector
A
- sum of all smaller vectors of ventricular depolarization
- origin = AV node
- larger Left ventricle = QRS vector points to the left
- BOTH direction and magnitude
3
Q
Position of means QRS Vector
A
- degrees
- circle in frontal plane (limb leads)
- center of circle = AV node
- norm vector = +90-0 deg
4
Q
Normal QRS Vector
A
+90 deg to 0 deg
5
Q
Position of heart for tall, slender individs
A
- heart rotated to the right
- “vertical” heart
6
Q
Position of heart for obese individs
A
- heart pushed up
- “horizontal” heart
7
Q
hypertrophied ventricles
A
- increased depolarization
- Means QRS vector deviates to the ventricle that is hypertrophied
8
Q
myocardial infarct
A
- heart attack
- doesn’t depolarize, no vectors
- means QRS vector points away from infarct
9
Q
Means QRS Vector provides what?
A
- info on position of heart
- insight into ventricular hypertrophy
- info concerning MI
10
Q
Lead 1 and AVF both positive
A
normal
11
Q
Lead 1 positive and AVF negative
A
LAD
12
Q
Lead 1 negative and AVF positive
A
RAD
13
Q
Lead 1 negative and AVF negative
A
ERAD
14
Q
rightward rotation
A
V1 and V2
15
Q
normal range rotation
A
V3 and V4
