ECGs Flashcards
1
Q
How many seconds is 1 small square on an ECG?
A
0.04seconds
2
Q
How many seconds is 1 large square on an ECG?
A
0.20seconds
3
Q
How many voltages is 1 large square on an ECG?
A
1mV
4
Q
Two methods of calculating HR
A
- Number of complexes in 6sec x 10
- Number of large squares between 2 complexes
5
Q
Duration of the PR interval?
A
0.12 - 0.20sec (3-5 small boxes)
6
Q
Width of the QRS complex?
A
Narrow. Normally between 0.04 - 0.12 seconds.
7
Q
When is ST segment elevation abnormal?
A
> 1mm (1 small box) above baseline
8
Q
When is ST segment depression abnormal?
A
> 0.5mm below baseline
9
Q
What does ST elevation indicate?
A
Myocardial Injury
10
Q
What does ST depression indicate?
A
Myocardial ischemia
Digoxin toxicity
11
Q
What is the normal height of the T wave in limb leads and chest leads?
A
not>5mm in limb leads
not>10mm in chest leads
