Part 1: EKG Basics Flashcards
1
Q
How if voltage measured
A
1 small box = 0.1mV
2
Q
Inferior leads
A
II, III, aVF
3
Q
Anterior leads
A
V1, V2, V3
4
Q
Posterior leads
A
V1, V2 (inverted view)
5
Q
Lateral (left) leads
A
I, aVL, V4-V6
6
Q
Right leads
A
aVR, V1
7
Q
Normal P-wave measurements
A
<0.25mV
<120msec
8
Q
Normal PR interval
A
120-200msec
9
Q
QRS duration
A
<120msec
10
Q
Normal QTc
A
250-450msec
11
Q
How to determine axis via isoelectric lead
A
90 from isoelectric, then look at aVF to determine positive or negative
12
Q
What is isoelectric in multiple leads?
A
then indeterminate axis
13
Q
Look for atrial enlargement in which leads
A
II, V1
14
Q
Why V1 in atrial enlargement?
A
biphasic, able to tell which is hypertrophied
15
Q
Atrial enlargement measurements
A
right: >25mV
left: more than 120msec
