ECG’s Flashcards
1
Q
How to calculate the rate
A
Count the number of R waves in 6 secs (30 lge squares)
(1 lge square = to 0.2 sec)
Then multiply x 10 ( better for irregular rates)
Or count the number of large squares between 2 consecutive R waves divide by 300 (better for regular)
2
Q
Left Axis deviation
A
Positive lead 1 and negative in AVF
3
Q
Right axis deviation
A
Negative lead 1 and positive AVF
4
Q
P wave
A
0.08 sec or 2 small square
5
Q
PR interval
A
0.12-0.20 sec or 3-5 small squares
6
Q
QRS complex
A
Max 0.12 secs or 3 small squares
7
Q
QT interval
A
Less than half processing R-R interval
8
Q
Cardiac conduction system
A
SA node - AV node- bundle of His- perkinje fibres
9
Q
Inverted or flattened T wave
A
Indicates myocardial ischemia
10
Q
Peaked T- waves
A
Indicates hyperkalaemia
