ECGs

 \n P wave = Atrial depolarisation

QRS complex = Ventricular depolarisation. Should be <0.120s (3 boxes).

PR interval = Time for impulse to travel from atria > ventricles. Should be 0.120 - 0.20s (3-5 boxes).

QT interval = All the electrical activity in 1 ventricular cycle. Should be 0.360s - 0.440s (9-11 boxes).

ST segment = Early ventricular repolarisation

T wave = Repolarisation of ventricles. First half = ^^absolute refractory period^^, second half = ^^relative refractory period^^.

J point = Where the QRS complex ends and the ST segment begins.

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6 rules of ECG interpretation

1. Rate: what is the rate? It should be between 60 - 100bpm
2. Rhythm: what is the rhythm? The R waves should be equal distances apart.
3. P wave: is there a clear P wave? Is it a normal shape?
4. PR interval: is it between 0.120s - 0.20s?
5. QRS duration: is it <0.120s?
6. ST segment: is there any ST elevation/depression?

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Lead views and coronary arteries involved

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