Components of ECG

Components of ECG
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‘P’ wave

Is first upward deflection it represents arterial depolarization.

‘PR’ interval

Is beginning of ‘P’ wave to beginning of ‘QRS’ complex it represents depolarization of ventricles

‘QRS’ Complex

Contains up to 3 waves, the ‘Q’ wave, ‘R’ wave, and ‘S’ wave it represents depolarization of ventricles

‘Q’wave

First negative deflection after ‘P’ wave is represents depolarization of septum

‘R’ wave

First positive deflection following ‘P’ or ‘Q’ wave it represents depolarization of ventricles

‘S’ wave

Negative deflection following ‘R’ wave, it represents depolarization of ventricles

‘T’ wave

First upward deflection after ‘S’ wave, it represents repolarization of ventricles

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