Normal ECG Flashcards
1
Q
Smallest square =
A
0.04 s, 1 mm
2
Q
Large square=
A
0.2s, 5mm
3
Q
Normal P wave
A
Negative in AVR
Positive in II
4
Q
Normal variations of P wave
A
Biphasic in V1 but more + than -
5
Q
P wave duration and amplitude
A
120 ms (3 small squares) 0.25 mV (2.5 small squares)
6
Q
PR interval definition
A
Beginning of P to beginning of Q
7
Q
Normal PR interval duration
A
110-200 ms
2.5 to 5 small squares
8
Q
Normal Axis
A
-30 to +90 degrees
9
Q
Axis:
I + and II +
A
Normal
10
Q
Axis:
I + and II -
A
LAD
11
Q
Axis:
I - and II +
A
RAD
12
Q
Axis:
I - and II -
A
Extreme RAD
13
Q
Normal QRS duration
A
<120 ms (3 small squares)
14
Q
Normal R or S amplitude
A
25 mm
15
Q
Normal point of polarity change for precordial leads
A
V3, V4
