Recording the ECG Flashcards
1
Q
Normal PR interval
A
.12 - .20 sec
2
Q
Normal QRS
A
less the .1 second
3
Q
Normal R wave
A
less than 20 mm in chest leads V1-V6
4
Q
Normal Q wave
A
less than 1mm and less the 1mm deep
5
Q
Lead axis
A
- hypothetical line joining the poles
- measures the difference in electrical potential between + and - electrodes
6
Q
Bipolar limb leads
A
- I, II, III
- frontal plane
- positive and negative electrodes
7
Q
Augmented Limb leads
A
- aVR, aVL, aVF
- frontal plane
- elimination of negative electrode (unipolar)
8
Q
Negative pole for augmented limb leads is called the…
A
Central terminal (CT)
9
Q
T/F: CT only exist when three limb electrodes are attached
A
TRUE
10
Q
Augmented Lead axis
A
measures difference in electrical potential between + limb electrode and - CT
11
Q
Precordial Leads
A
- V1-V6
- unipolar
- horizontal plane
12
Q
V1 placement
A
right sternum, 4th intercostal space
13
Q
V2 placement
A
left of sternum, 4th intercostal space
14
Q
V4 placement
A
midclavicular line, 5th intercostal space
15
Q
V3 placement
A
midway between V2 and V4
