Wednesday, June 29, 2011

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ECG waves, their meaning and normal duration.


1) P wave - atrial depolarisation, < 120 ms
2) PR segment - end of P wave till beginning of QRS complex i.e. time taken between atrial and ventricular activation.
3) PR interval - onset of P wave till onset of QRS complex, 120-200 ms
4) QRS complex - ventricular depolarisation, <110 ms
5) T wave - ventricular repolarisation
6) U wave - repolarisation of Purkinje fibres
7) QT interval - beginning of QRS complex till end of T wave

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