ECG Measurements Flashcards
1
Q
How many seconds in 1 small box?
A
0.04 seconds
2
Q
How many seconds in 1 large box?
A
0.20 seconds
3
Q
How many boxes in a 6-second strip?
A
30 large boxes
4
Q
How many large boxes on a 1-minute strip?
A
300 large boxes
5
Q
How many small boxes on a 1-minute strip?
A
1,500 small boxes
6
Q
What speed does the ECG paper usually move?
A
25 mm/s
7
Q
What does the horizontal axis of the ECG paper reflect?
A
Measurement of time
8
Q
What does the vertical axis of the ECG paper reflect?
A
Voltage amplitude = 1 milivolt/2 large boxes high
9
Q
How many seconds in a normal PR interval?
A
0.12 - 0.20 seconds
10
Q
How many seconds in a normal QRS complex?
A
0.12 seconds
11
Q
How many seconds in a normal QT interval?
A
0.32 - 0.44
